.gitlab-ci.yml

@@ -145,9 +145,7 @@ pypi-publication:
     - pip install -e .[docs]
 
   script:
-    - cd docs
-    - make html
-    - mv _build/html ../public
+    - mkdocs build --strict --verbose
 
 docs-build:
   extends: .docs

.isort.cfg

@@ -8,4 +8,4 @@ line_length = 88
 
 default_section=FIRSTPARTY
 known_first_party = arkindex,arkindex_common
-known_third_party =PIL,apistar,gitlab,gnupg,peewee,playhouse,pytest,recommonmark,requests,responses,setuptools,sh,shapely,tenacity,yaml,zstandard
+known_third_party =PIL,apistar,gitlab,gnupg,peewee,playhouse,pytest,requests,responses,setuptools,sh,shapely,tenacity,yaml,zstandard

.pre-commit-config.yaml

@@ -23,7 +23,6 @@ repos:
     rev: v3.1.0
     hooks:
       - id: check-ast
-      - id: check-docstring-first
       - id: check-executables-have-shebangs
       - id: check-merge-conflict
       - id: check-symlinks

README.md

-Arkindex base Worker
-====================
+# Arkindex base Worker
 
 An easy to use Python 3 high level API client, to build ML tasks.
 
-
 ## Create a new worker using our template
 
 ```
 pip install --user cookiecutter
-cookiecutter git@gitlab.com:arkindex/base-worker.git
+cookiecutter git@gitlab.com:teklia/workers/base-worker.git
 ```

VERSION

-0.3.0-rc5
+0.3.1-beta1

arkindex_worker/cache.py

@@ -10,6 +10,8 @@ reducing network usage.
 import json
 import os
 import sqlite3
+from pathlib import Path
+from typing import Optional, Union
 
 from peewee import (
     BooleanField,
@@ -26,9 +28,9 @@ from peewee import (
     TextField,
     UUIDField,
 )
+from PIL import Image
 
 from arkindex_worker import logger
-from arkindex_worker.image import open_image, polygon_bounding_box
 
 db = SqliteDatabase(None)
 
@@ -65,6 +67,10 @@ class Version(Model):
 
 
 class CachedImage(Model):
+    """
+    Cache image table
+    """
+
     id = UUIDField(primary_key=True)
     width = IntegerField()
     height = IntegerField()
@@ -76,6 +82,10 @@ class CachedImage(Model):
 
 
 class CachedElement(Model):
+    """
+    Cache element table
+    """
+
     id = UUIDField(primary_key=True)
     parent_id = UUIDField(null=True)
     type = CharField(max_length=50)
@@ -91,19 +101,20 @@ class CachedElement(Model):
         database = db
         table_name = "elements"
 
-    def open_image(self, *args, max_size=None, **kwargs):
+    def open_image(self, *args, max_size: Optional[int] = None, **kwargs) -> Image:
         """
         Open this element's image as a Pillow image.
         This does not crop the image to the element's polygon.
         IIIF servers with maxWidth, maxHeight or maxArea restrictions on image size are not supported.
 
-        :param \\*args: Positional arguments passed to :meth:`arkindex_worker.image.open_image`
+        :param *args: Positional arguments passed to [arkindex_worker.image.open_image][]
         :param max_size: Subresolution of the image.
-        :type max_size: int or None
-        :param \\**kwargs: Keyword arguments passed to :meth:`arkindex_worker.image.open_image`
+        :param **kwargs: Keyword arguments passed to [arkindex_worker.image.open_image][]
         :raises ValueError: When this element does not have an image ID or a polygon.
-        :returns PIL.Image: A Pillow image.
+        :return: A Pillow image.
         """
+        from arkindex_worker.image import open_image, polygon_bounding_box
+
         if not self.image_id or not self.polygon:
             raise ValueError(f"Element {self.id} has no image")
 
@@ -152,6 +163,10 @@ class CachedElement(Model):
 
 
 class CachedTranscription(Model):
+    """
+    Cache transcription table
+    """
+
     id = UUIDField(primary_key=True)
     element = ForeignKeyField(CachedElement, backref="transcriptions")
     text = TextField()
@@ -165,6 +180,10 @@ class CachedTranscription(Model):
 
 
 class CachedClassification(Model):
+    """
+    Cache classification table
+    """
+
     id = UUIDField(primary_key=True)
     element = ForeignKeyField(CachedElement, backref="classifications")
     class_name = TextField()
@@ -178,6 +197,10 @@ class CachedClassification(Model):
 
 
 class CachedEntity(Model):
+    """
+    Cache entity table
+    """
+
     id = UUIDField(primary_key=True)
     type = CharField(max_length=50)
     name = TextField()
@@ -191,6 +214,10 @@ class CachedEntity(Model):
 
 
 class CachedTranscriptionEntity(Model):
+    """
+    Cache transcription entity table
+    """
+
     transcription = ForeignKeyField(
         CachedTranscription, backref="transcription_entities"
     )
@@ -219,7 +246,11 @@ MODELS = [
 SQL_VERSION = 1
 
 
-def init_cache_db(path):
+def init_cache_db(path: str):
+    """
+    Create the cache database on the given path
+    :param path: Where the new database should be created
+    """
     db.init(
         path,
         pragmas={
@@ -250,7 +281,12 @@ def create_version_table():
     Version.create(version=SQL_VERSION)
 
 
-def check_version(cache_path):
+def check_version(cache_path: Union[str, Path]):
+    """
+    Check the validity of the SQLite version
+
+    :param cache_path: Path towards a local SQLite database
+    """
     with SqliteDatabase(cache_path) as provided_db:
         with provided_db.bind_ctx([Version]):
             try:
@@ -263,7 +299,16 @@ def check_version(cache_path):
             ), f"The SQLite database {cache_path} does not have the correct cache version, it should be {SQL_VERSION}"
 
 
-def retrieve_parents_cache_path(parent_ids, data_dir="/data", chunk=None):
+def retrieve_parents_cache_path(
+    parent_ids: list, data_dir: str = "/data", chunk: int = None
+) -> list:
+    """
+    Retrieve the path of the given parent's in the
+    :param parent_ids: List of element IDs to search
+    :param data_dir: Base folder where to look for
+    :param chunk: Index of the chunk of the db that might contain the paths
+    :return: The corresponding list of paths
+    """
     assert isinstance(parent_ids, list)
     assert os.path.isdir(data_dir)
 
@@ -288,9 +333,11 @@ def retrieve_parents_cache_path(parent_ids, data_dir="/data", chunk=None):
     )
 
 
-def merge_parents_cache(paths, current_database):
+def merge_parents_cache(paths: list, current_database: str):
     """
     Merge all the potential parent task's databases into the existing local one
+    :param paths: Path to cache databases
+    :param current_database: Path to the current database
     """
     assert os.path.exists(current_database)
 

arkindex_worker/git.py

@@ -6,10 +6,12 @@ import shutil
 import time
 from datetime import datetime
 from pathlib import Path
+from typing import Optional, Union
 
 import gitlab
 import requests
 import sh
+from gitlab.v4.objects import MergeRequest, ProjectMergeRequest
 
 from arkindex_worker import logger
 
@@ -22,13 +24,13 @@ class GitlabHelper:
 
     def __init__(
         self,
-        project_id,
-        gitlab_url,
-        gitlab_token,
-        branch,
-        rebase_wait_period=1,
-        delete_source_branch=True,
-        max_rebase_tries=10,
+        project_id: str,
+        gitlab_url: str,
+        gitlab_token: str,
+        branch: str,
+        rebase_wait_period: Optional[int] = 1,
+        delete_source_branch: Optional[bool] = True,
+        max_rebase_tries: Optional[int] = 10,
     ):
         """
         :param project_id: the id of the gitlab project
@@ -52,13 +54,13 @@ class GitlabHelper:
         self.project = self._api.projects.get(self.project_id)
         self.is_rebase_finished = False
 
-    def merge(self, branch_name, title) -> bool:
+    def merge(self, branch_name: str, title: str) -> bool:
         """
         Create a merge request and try to merge.
         Always rebase first to avoid conflicts from MRs made in parallel
-        :param branch_name: source branch name
-        :param title: title of the merge request
-        :return: was the branch successfully merged?
+        :param branch_name: Source branch name
+        :param title: Title of the merge request
+        :return: Whether the branch was successfully merged
         """
         mr = None
         # always rebase first, because other workers might have merged already
@@ -95,7 +97,14 @@ class GitlabHelper:
 
         return False
 
-    def _create_merge_request(self, branch_name, title):
+    def _create_merge_request(self, branch_name: str, title: str) -> MergeRequest:
+        """
+        Create a MergeRequest towards the branch with the given title
+
+        :param branch_name: Target branch of the merge request
+        :param title: Title of the merge request
+        :return: The created merge request
+        """
         logger.info(f"Creating a merge request for {branch_name}")
         # retry_transient_error will retry the request on 50X errors
         # https://github.com/python-gitlab/python-gitlab/blob/265dbbdd37af88395574564aeb3fd0350288a18c/gitlab/__init__.py#L539
@@ -108,16 +117,24 @@ class GitlabHelper:
         )
         return mr
 
-    def _get_merge_request(self, merge_request_id, include_rebase_in_progress=True):
+    def _get_merge_request(
+        self, merge_request_id: Union[str, int], include_rebase_in_progress: bool = True
+    ) -> ProjectMergeRequest:
+        """
+        Retrieve a merge request by ID
+        :param merge_request_id: The ID of the merge request
+        :param include_rebase_in_progress: Whether the rebase in progree should be included
+        :return: The related merge request
+        """
         return self.project.mergerequests.get(
             merge_request_id, include_rebase_in_progress=include_rebase_in_progress
         )
 
-    def _wait_for_rebase_to_finish(self, merge_request_id) -> bool:
+    def _wait_for_rebase_to_finish(self, merge_request_id: Union[str, int]) -> bool:
         """
         Poll the merge request until it has finished rebasing
-        :param merge_request_id:
-        :return: rebase finished successfully?
+        :param merge_request_id: The ID of the merge request
+        :return: Whether the rebase has finished successfully
         """
 
         logger.info("Checking if rebase has finished..")
@@ -134,10 +151,10 @@ class GitlabHelper:
         return False
 
 
-def make_backup(path):
+def make_backup(path: str):
     """
     Create a backup file in the same directory with timestamp as suffix ".bak_{timestamp}"
-    :param path: file to be backed up
+    :param path: Path to the file to be backed up
     """
     path = Path(path)
     if not path.exists():
@@ -150,10 +167,10 @@ def make_backup(path):
 
 
 def prepare_git_key(
-    private_key,
-    known_hosts,
-    private_key_path="~/.ssh/id_ed25519",
-    known_hosts_path="~/.ssh/known_hosts",
+    private_key: str,
+    known_hosts: str,
+    private_key_path: Optional[str] = "~/.ssh/id_ed25519",
+    known_hosts_path: Optional[str] = "~/.ssh/known_hosts",
 ):
     """
     Prepare the git keys (put them in to the correct place) so that git could be used.
@@ -198,24 +215,25 @@ class GitHelper:
     """
     A helper class for running git commands
 
-    At the beginning of the workflow call `run_clone_in_background`.
+    At the beginning of the workflow call [run_clone_in_background][arkindex_worker.git.GitHelper.run_clone_in_background].
     When all the files are ready to be added to git then call
-    `save_files` to move the files in to the git repository
+    [save_files][arkindex_worker.git.GitHelper.save_files] to move the files in to the git repository
     and try to push them.
 
-    Pseudo code example:
-        in worker.configure() configure the git helper and start the cloning:
-        ```
-        gitlab = GitlabHelper(...)
-        prepare_git_key(...)
-        self.git_helper = GitHelper(workflow_id=workflow_id, gitlab_helper=gitlab, ...)
-        self.git_helper.run_clone_in_background()
-        ```
-
-        at the end of the workflow (at the end of worker.run()) push the files to git:
-        ```
-        self.git_helper.save_files(self.out_dir)
-        ```
+    Examples
+    --------
+    in worker.configure() configure the git helper and start the cloning:
+    ```
+    gitlab = GitlabHelper(...)
+    prepare_git_key(...)
+    self.git_helper = GitHelper(workflow_id=workflow_id, gitlab_helper=gitlab, ...)
+    self.git_helper.run_clone_in_background()
+    ```
+
+    at the end of the workflow (at the end of worker.run()) push the files to git:
+    ```
+    self.git_helper.save_files(self.out_dir)
+    ```
     """
 
     def __init__(
@@ -294,6 +312,9 @@ class GitHelper:
         """
         Move files in export_out_dir to the cloned git repository
         and try to merge the created files if possible.
+        :param export_out_dir: Path to the files to be saved
+        :raises sh.ErrorReturnCode: _description_
+        :raises Exception: _description_
         """
         self._wait_for_clone_to_finish()
 
@@ -350,6 +371,8 @@ class GitHelper:
         """
         Move all files in the export_out_dir to the git repository
         while keeping the same directory structure
+        :param export_out_dir: Path to the files to be moved
+        :return: Total count of moved files
         """
         file_count = 0
         file_names = [

arkindex_worker/image.py

@@ -2,11 +2,12 @@
 """
 Helper methods to download and open IIIF images, and manage polygons.
 """
-
 import os
 from collections import namedtuple
 from io import BytesIO
 from math import ceil
+from pathlib import Path
+from typing import TYPE_CHECKING, List, Optional, Union
 
 import requests
 from PIL import Image
@@ -21,28 +22,38 @@ from tenacity import (
 
 from arkindex_worker import logger
 
+# Avoid circular imports error when type checking
+if TYPE_CHECKING:
+    from arkindex_worker.cache import CachedElement
+    from arkindex_worker.models import Element
+
 # See http://docs.python-requests.org/en/master/user/advanced/#timeouts
 DOWNLOAD_TIMEOUT = (30, 60)
 
 BoundingBox = namedtuple("BoundingBox", ["x", "y", "width", "height"])
 
 
-def open_image(path, mode="RGB", rotation_angle=0, mirrored=False):
+def open_image(
+    path: Union[str, Path],
+    mode: Optional[str] = "RGB",
+    rotation_angle: Optional[int] = 0,
+    mirrored: Optional[bool] = False,
+) -> Image:
     """
     Open an image from a path or a URL.
 
-    .. warning:: Prefer :meth:`Element.open_image` whenever possible.
+    Warns:
+    Prefer [arkindex_worker.models.Element.open_image][] whenever possible.
 
-    :param path str: Path or URL to open the image from.
+    :param path: Path or URL to open the image from.
        This parameter will be interpreted as a URL when it has a `http` or `https` scheme
        and no file exist with this path locally.
-    :param mode str: Pillow mode for the image. See `the Pillow documentation
-        <https://pillow.readthedocs.io/en/stable/handbook/concepts.html#modes>`_.
-    :param int rotation_angle: Rotation angle to apply to the image, in degrees.
+    :param mode: Pillow mode for the image. See [the Pillow documentation](https://pillow.readthedocs.io/en/stable/handbook/concepts.html#modes).
+    :param rotation_angle: Rotation angle to apply to the image, in degrees.
        If it is not a multiple of 90°, then the rotation can cause empty pixels of
        the mode's default color to be added for padding.
-    :param bool mirrored: Whether or not to mirror the image horizontally.
-    :returns PIL.Image: A Pillow image.
+    :param mirrored: Whether or not to mirror the image horizontally.
+    :returns: A Pillow image.
     """
     if (
         path.startswith("http://")
@@ -68,12 +79,12 @@ def open_image(path, mode="RGB", rotation_angle=0, mirrored=False):
     return image
 
 
-def download_image(url):
+def download_image(url: str) -> Image:
     """
     Download an image and open it with Pillow.
 
-    :param url str: URL of the image.
-    :returns PIL.Image: A Pillow image.
+    :param url: URL of the image.
+    :returns: A Pillow image.
     """
     assert url.startswith("http"), "Image URL must be HTTP(S)"
 
@@ -110,13 +121,12 @@ def download_image(url):
     return image
 
 
-def polygon_bounding_box(polygon):
+def polygon_bounding_box(polygon: List[List[Union[int, float]]]) -> BoundingBox:
     """
     Compute the rectangle bounding box of a polygon.
 
     :param polygon: Polygon to get the bounding box of.
-    :type polygon: list(list(int or float))
-    :returns BoundingBox: Bounding box of this polygon.
+    :returns: Bounding box of this polygon.
     """
     x_coords, y_coords = zip(*polygon)
     x, y = min(x_coords), min(y_coords)
@@ -144,12 +154,12 @@ def _retried_request(url):
     return resp
 
 
-def download_tiles(url):
+def download_tiles(url: str) -> Image:
     """
     Reconstruct a full IIIF image on servers that cannot serve the full-sized image, using tiles.
 
-    :param str url: URL of the image.
-    :returns PIL.Image: A Pillow image.
+    :param url: URL of the image.
+    :returns: A Pillow image.
     """
     if not url.endswith("/"):
         url += "/"
@@ -217,19 +227,19 @@ def download_tiles(url):
     return full_image
 
 
-def trim_polygon(polygon, image_width: int, image_height: int):
+def trim_polygon(
+    polygon: List[List[int]], image_width: int, image_height: int
+) -> List[List[int]]:
     """
     Trim a polygon to an image's boundaries, with non-negative coordinates.
 
     :param polygon: A polygon to trim.
-    :type: list(list(int or float) or tuple(int or float)) or tuple(tuple(int or float) or list(int or float))
-    :param image_width int: Width of the image.
-    :param image_height int: Height of the image.
+    :param image_width: Width of the image.
+    :param image_height: Height of the image.
     :returns: A polygon trimmed to the image's bounds.
        Some points may appear as missing, as the trimming can deduplicate points.
        The first and last point are always equal, to reproduce the behavior
        of the Arkindex backend.
-    :rtype: list(list(int or float))
     :raises AssertionError: When argument types are invalid or when the trimmed polygon
        is entirely outside of the image's bounds.
     """
@@ -270,28 +280,28 @@ def trim_polygon(polygon, image_width: int, image_height: int):
     return updated_polygon
 
 
-def revert_orientation(element, polygon, reverse: bool = False):
+def revert_orientation(
+    element: Union["Element", "CachedElement"],
+    polygon: List[List[Union[int, float]]],
+    reverse: Optional[bool] = False,
+) -> List[List[int]]:
     """
     Update the coordinates of the polygon of a child element based on the orientation of
     its parent.
 
     This method should be called before sending any polygon to Arkindex, to undo the possible
-    orientation applied by :meth:`Element.open_image`.
+    orientation applied by [arkindex_worker.models.Element.open_image][].
 
     In some cases, we want to apply the parent's orientation on the child's polygon instead. This is done
     by enabling `reverse=True`.
 
     :param element: Parent element.
-    :type element: Element or CachedElement
     :param polygon: Polygon corresponding to the child element.
-    :type polygon: list(list(int or float))
-    :param mode: Whether we should revert (`revert`) or apply (`apply`) the parent's orientation.
-    :type mode: str
+    :param reverse: Whether we should revert or apply the parent's orientation.
     :return: A polygon with updated coordinates.
-    :rtype: list(list(int))
     """
-    from arkindex_worker.models import Element
     from arkindex_worker.cache import CachedElement
+    from arkindex_worker.models import Element
 
     assert element and isinstance(
         element, (Element, CachedElement)

arkindex_worker/models.py

@@ -5,12 +5,12 @@ Wrappers around API results to provide more convenient attribute access and IIIF
 
 import tempfile
 from contextlib import contextmanager
-from typing import Optional
+from typing import Generator, Optional
 
+from PIL import Image
 from requests import HTTPError
 
 from arkindex_worker import logger
-from arkindex_worker.image import download_tiles, open_image, polygon_bounding_box
 
 
 class MagicDict(dict):
@@ -63,7 +63,12 @@ class Element(MagicDict):
     Describes an Arkindex element.
     """
 
-    def resize_zone_url(self, size="full"):
+    def resize_zone_url(self, size: str = "full") -> str:
+        """
+        Compute the URL of the image corresponding to the size
+        :param size: Requested size
+        :return: The URL corresponding to the size
+        """
         if size == "full":
             return self.zone.url
         else:
@@ -71,13 +76,12 @@ class Element(MagicDict):
             parts[-3] = size
             return "/".join(parts)
 
-    def image_url(self, size="full") -> Optional[str]:
+    def image_url(self, size: str = "full") -> Optional[str]:
         """
         Build an URL to access the image.
         When possible, will return the S3 URL for images, so an ML worker can bypass IIIF servers.
-        :param str size: Subresolution of the image, following the syntax of the IIIF resize parameter.
+        :param size: Subresolution of the image, following the syntax of the IIIF resize parameter.
         :returns: An URL to the image, or None if the element does not have an image.
-        :rtype: str or None
         """
         if not self.get("zone"):
             return
@@ -92,9 +96,11 @@ class Element(MagicDict):
     @property
     def requires_tiles(self) -> bool:
         """
-        :return bool: Whether or not downloading and combining IIIF tiles will be necessary
+        :returns: Whether or not downloading and combining IIIF tiles will be necessary
            to retrieve this element's image. Will be False if the element has no image.
         """
+        from arkindex_worker.image import polygon_bounding_box
+
         if not self.get("zone") or self.zone.image.get("s3_url"):
             return False
         max_width = self.zone.image.server.max_width or float("inf")
@@ -102,7 +108,13 @@ class Element(MagicDict):
         bounding_box = polygon_bounding_box(self.zone.polygon)
         return bounding_box.width > max_width or bounding_box.height > max_height
 
-    def open_image(self, *args, max_size=None, use_full_image=False, **kwargs):
+    def open_image(
+        self,
+        *args,
+        max_size: Optional[int] = None,
+        use_full_image: Optional[bool] = False,
+        **kwargs
+    ) -> Image:
         """
         Open this element's image using Pillow, rotating and mirroring it according
         to the ``rotation_angle`` and ``mirrored`` attributes.
@@ -111,12 +123,12 @@ class Element(MagicDict):
         to bypass IIIF servers, the image will be cropped to the rectangle bounding box
         of the ``zone.polygon`` attribute.
 
-        .. warning::
-
+        Warns:
+        ----
            This method implicitly applies the element's orientation to the image.
 
            If your process uses the returned image to find more polygons and send them
-           back to Arkindex, use the :meth:`arkindex_worker.image.revert_orientation`
+           back to Arkindex, use the [arkindex_worker.image.revert_orientation][]
            helper to undo the orientation on all polygons before sending them, as the
            Arkindex API expects unoriented polygons.
 
@@ -125,19 +137,24 @@ class Element(MagicDict):
 
 
         :param max_size: The maximum size of the requested image.
-        :type max_size: int or None
-        :param bool use_full_image: Ignore the ``zone.polygon`` and always
+        :param use_full_image: Ignore the ``zone.polygon`` and always
            retrieve the image without cropping.
-        :param \\*args: Positional arguments passed to :meth:`arkindex_worker.image.open_image`.
-        :param \\**kwargs: Keyword arguments passed to :meth:`arkindex_worker.image.open_image`.
+        :param *args: Positional arguments passed to [arkindex_worker.image.open_image][].
+        :param **kwargs: Keyword arguments passed to [arkindex_worker.image.open_image][].
         :raises ValueError: When the element does not have an image.
         :raises NotImplementedError: When the ``max_size`` parameter is set,
            but the IIIF server's configuration requires downloading and combining tiles
            to retrieve the image.
         :raises NotImplementedError: When an S3 URL has been used to download the image,
            but the URL has expired. Re-fetching the URL automatically is not supported.
-        :return PIL.Image: A Pillow image.
+        :return: A Pillow image.
         """
+        from arkindex_worker.image import (
+            download_tiles,
+            open_image,
+            polygon_bounding_box,
+        )
+
         if not self.get("zone"):
             raise ValueError("Element {} has no zone".format(self.id))
 
@@ -197,18 +214,25 @@ class Element(MagicDict):
             raise
 
     @contextmanager
-    def open_image_tempfile(self, format="jpeg", *args, **kwargs):
+    def open_image_tempfile(
+        self, format: Optional[str] = "jpeg", *args, **kwargs
+    ) -> Generator[tempfile.NamedTemporaryFile, None, None]:
         """
         Get the element's image as a temporary file stored on the disk.
-        To be used as a context manager::
+        To be used as a context manager.
 
-           with element.open_image_tempfile() as f:
-               ...
+        Example
+        ----
+        ```
+        with element.open_image_tempfile() as f:
+            ...
+        ```
 
-        :param format str: File format to use the store the image on the disk.
+        :param format: File format to use the store the image on the disk.
            Must be a format supported by Pillow.
-        :param \\*args: Positional arguments passed to :meth:`arkindex_worker.image.open_image`.
-        :param \\**kwargs: Keyword arguments passed to :meth:`arkindex_worker.image.open_image`.
+        :param *args: Positional arguments passed to [arkindex_worker.image.open_image][].
+        :param **kwargs: Keyword arguments passed to [arkindex_worker.image.open_image][].
+
         """
         with tempfile.NamedTemporaryFile() as f:
             self.open_image(*args, **kwargs).save(f, format=format)
@@ -229,12 +253,3 @@ class Transcription(MagicDict):
 
     def __str__(self):
         return "Transcription ({})".format(self.id)
-
-
-class Corpus(MagicDict):
-    """
-    Describes an Arkindex corpus.
-    """
-
-    def __str__(self):
-        return "Corpus {} ({})".format(self.name, self.id)

arkindex_worker/reporting.py

@@ -7,6 +7,9 @@ import json
 import traceback
 from collections import Counter
 from datetime import datetime
+from pathlib import Path
+from typing import Dict, List, Optional, Union
+from uuid import UUID
 
 from apistar.exceptions import ErrorResponse
 
@@ -19,7 +22,11 @@ class Reporter(object):
     """
 
     def __init__(
-        self, name="Unknown worker", slug="unknown-slug", version=None, **kwargs
+        self,
+        name: Optional[str] = "Unknown worker",
+        slug: Optional[str] = "unknown-slug",
+        version: Optional[str] = None,
+        **kwargs,
     ):
         self.report_data = {
             "name": name,
@@ -52,51 +59,48 @@ class Reporter(object):
             },
         )
 
-    def process(self, element_id):
+    def process(self, element_id: Union[str, UUID]):
         """
         Report that a specific element ID is being processed.
 
         :param element_id: ID of the element being processed.
-        :type element_id: str or uuid.UUID
         """
         # Just call the element initializer
         self._get_element(element_id)
 
-    def add_element(self, parent_id, type, type_count=1):
+    def add_element(self, parent_id: Union[str, UUID], type: str, type_count: int = 1):
         """
         Report creating an element as a child of another.
 
         :param parent_id: ID of the parent element.
-        :type parent_id: str or uuid.UUID
-        :param type str: Slug of the type of the child element.
-        :param type_count int: How many elements of this type were created. Defaults to 1.
+        :param type: Slug of the type of the child element.
+        :param type_count: How many elements of this type were created.
         """
         elements = self._get_element(parent_id)["elements"]
         elements.setdefault(type, 0)
         elements[type] += type_count
 
-    def add_classification(self, element_id, class_name):
+    def add_classification(self, element_id: Union[str, UUID], class_name: str):
         """
         Report creating a classification on an element.
 
         :param element_id: ID of the element.
-        :type element_id: str or uuid.UUID
-        :param class_name str: Name of the ML class of the new classification.
+        :param class_name: Name of the ML class of the new classification.
         """
         classifications = self._get_element(element_id)["classifications"]
         classifications.setdefault(class_name, 0)
         classifications[class_name] += 1
 
-    def add_classifications(self, element_id, classifications):
+    def add_classifications(
+        self, element_id: Union[str, UUID], classifications: List[Dict[str, str]]
+    ):
         """
         Report creating one or more classifications at once on an element.
 
         :param element_id: ID of the element.
-        :type element_id: str or uuid.UUID
         :param classifications: List of classifications.
            Each classification is represented as a ``dict`` with a ``class_name`` key
            holding the name of the ML class being used.
-        :type classifications: List[Dict[str, str]]
         """
         assert isinstance(
             classifications, list
@@ -110,25 +114,29 @@ class Reporter(object):
         )
         element["classifications"] = dict(counter)
 
-    def add_transcription(self, element_id, count=1):
+    def add_transcription(self, element_id: Union[str, UUID], count=1):
         """
         Report creating a transcription on an element.
 
         :param element_id: ID of the element.
-        :type element_id: str or uuid.UUID
-        :param count int: Number of transcriptions created at once, defaults to 1.
+        :param count: Number of transcriptions created at once
         """
         self._get_element(element_id)["transcriptions"] += count
 
-    def add_entity(self, element_id, entity_id, type, name):
+    def add_entity(
+        self,
+        element_id: Union[str, UUID],
+        entity_id: Union[str, UUID],
+        type: str,
+        name: str,
+    ):
         """
         Report creating an entity on an element.
 
         :param element_id: ID of the element.
-        :type element_id: str or uuid.UUID
-        :param entity_id str: ID of the new entity.
-        :param type str: Type of the entity.
-        :param name str: Name of the entity.
+        :param entity_id: ID of the new entity.
+        :param type: Type of the entity.
+        :param name: Name of the entity.
         """
         entities = self._get_element(element_id)["entities"]
         entities.append({"id": entity_id, "type": type, "name": name})
@@ -149,26 +157,30 @@ class Reporter(object):
         """
         raise NotImplementedError
 
-    def add_metadata(self, element_id, metadata_id, type, name):
+    def add_metadata(
+        self,
+        element_id: Union[str, UUID],
+        metadata_id: Union[str, UUID],
+        type: str,
+        name: str,
+    ):
         """
         Report creating a metadata from an element.
 
         :param element_id: ID of the element.
-        :type element_id: str or uuid.UUID
-        :param metadata_id str: ID of the new metadata.
-        :param type str: Type of the metadata.
-        :param name str: Name of the metadata.
+        :param metadata_id: ID of the new metadata.
+        :param type: Type of the metadata.
+        :param name: Name of the metadata.
         """
         metadata = self._get_element(element_id)["metadata"]
         metadata.append({"id": metadata_id, "type": type, "name": name})
 
-    def error(self, element_id, exception):
+    def error(self, element_id: Union[str, UUID], exception: Exception):
         """
         Report that a Python exception occurred when processing an element.
 
         :param element_id: ID of the element.
-        :type element_id: str or uuid.UUID
-        :param exception Exception: A Python exception.
+        :param exception: A Python exception.
         """
         error_data = {
             "class": exception.__class__.__name__,
@@ -186,12 +198,11 @@ class Reporter(object):
 
         self._get_element(element_id)["errors"].append(error_data)
 
-    def save(self, path):
+    def save(self, path: Union[str, Path]):
         """
         Save the ML report to the specified path.
 
         :param path: Path to save the ML report to.
-        :type path: str or pathlib.Path
         """
         logger.info(f"Saving ML report to {path}")
         with open(path, "w") as f:

arkindex_worker/utils.py

@@ -9,11 +9,15 @@ from timeit import default_timer
 
 class Timer(object):
     """
-    A context manager to help measure execution times. Example usage::
+    A context manager to help measure execution times.
 
-       with Timer() as t:
-           # do something interesting
-       print(t.delta)  # X days, X:XX:XX
+    Example
+    ---
+    ```
+    with Timer() as t:
+        # do something interesting
+    print(t.delta)  # X days, X:XX:XX
+    ```
     """
 
     def __init__(self):

arkindex_worker/worker/__init__.py

@@ -8,6 +8,7 @@ import os
 import sys
 import uuid
 from enum import Enum
+from typing import Iterable, List, Union
 
 from apistar.exceptions import ErrorResponse
 
@@ -66,7 +67,13 @@ class ElementsWorker(
     ``arkindex.worker``, which provide helpers to read and write to the Arkindex API.
     """
 
-    def __init__(self, description="Arkindex Elements Worker", support_cache=False):
+    def __init__(
+        self, description: str = "Arkindex Elements Worker", support_cache: bool = False
+    ):
+        """
+        :param description: The worker's description
+        :param support_cache: Whether the worker supports cache
+        """
         super().__init__(description, support_cache)
 
         # Add mandatory argument to process elements
@@ -87,14 +94,13 @@ class ElementsWorker(
 
         self._worker_version_cache = {}
 
-    def list_elements(self):
+    def list_elements(self) -> Union[Iterable[CachedElement], List[str]]:
         """
         List the elements to be processed, either from the CLI arguments or
         the cache database when enabled.
 
-        :return: An iterable of :class:`CachedElement` when cache support is enabled,
+        :return: An iterable of [CachedElement][arkindex_worker.cache.CachedElement] when cache support is enabled,
            and a list of strings representing element IDs otherwise.
-        :rtype: Iterable[CachedElement] or List[str]
         """
         assert not (
             self.args.elements_list and self.args.element
@@ -121,12 +127,10 @@ class ElementsWorker(
         return out
 
     @property
-    def store_activity(self):
+    def store_activity(self) -> bool:
         """
         Whether or not WorkerActivity support has been enabled on the DataImport
         used to run this worker.
-
-        :rtype: bool
         """
         if self.args.dev:
             return False
@@ -136,6 +140,9 @@ class ElementsWorker(
         return self.process_information.get("activity_state") == "ready"
 
     def configure(self):
+        """
+        Setup the worker using CLI arguments and environment variables.
+        """
         # CLI args are stored on the instance so that implementations can access them
         self.args = self.parser.parse_args()
 
@@ -153,8 +160,8 @@ class ElementsWorker(
     def run(self):
         """
         Implements an Arkindex worker that goes through each element returned by
-        :meth:`list_elements`. It calls :meth:`process_element`, catching exceptions
-        and reporting them using the :class:`Reporter`, and handles saving the report
+        [list_elements][arkindex_worker.worker.ElementsWorker.list_elements]. It calls [process_element][arkindex_worker.worker.ElementsWorker.process_element], catching exceptions
+        and reporting them using the [Reporter][arkindex_worker.reporting.Reporter], and handles saving the report
         once the process is complete as well as WorkerActivity updates when enabled.
         """
         self.configure()
@@ -235,24 +242,24 @@ class ElementsWorker(
             if failed >= count:  # Everything failed!
                 sys.exit(1)
 
-    def process_element(self, element):
+    def process_element(self, element: Union[Element, CachedElement]):
         """
         Override this method to implement your worker and process a single Arkindex element at once.
 
         :param element: The element to process.
            Will be a CachedElement instance if cache support is enabled,
            and an Element instance otherwise.
-        :type element: Element or CachedElement
         """
 
-    def update_activity(self, element_id, state) -> bool:
+    def update_activity(
+        self, element_id: Union[str, uuid.UUID], state: ActivityState
+    ) -> bool:
         """
         Update the WorkerActivity for this element and worker.
 
         :param element_id: ID of the element.
-        :type element_id: str or uuid.UUID
-        :param state ActivityState: New WorkerActivity state for this element.
-        :returns bool: True if the update has been successful or WorkerActivity support is disabled.
+        :param state: New WorkerActivity state for this element.
+        :returns: True if the update has been successful or WorkerActivity support is disabled.
            False if the update has failed due to a conflict; this worker might have already processed
            this element.
         """

arkindex_worker/worker/base.py

@@ -8,6 +8,7 @@ import json
 import logging
 import os
 from pathlib import Path
+from typing import Optional
 
 import gnupg
 import yaml
@@ -32,11 +33,11 @@ from arkindex_worker.cache import (
 )
 
 
-def _is_500_error(exc) -> bool:
+def _is_500_error(exc: Exception) -> bool:
     """
     Check if an Arkindex API error has a HTTP 5xx error code.
-    Used to retry most API calls in :class:`BaseWorker`.
-    :rtype: bool
+    Used to retry most API calls in [BaseWorker][arkindex_worker.worker.base.BaseWorker].
+    :param exc: Exception to check
     """
     if not isinstance(exc, ErrorResponse):
         return False
@@ -44,17 +45,27 @@ def _is_500_error(exc) -> bool:
     return 500 <= exc.status_code < 600
 
 
+class ModelNotFoundError(Exception):
+    """
+    Exception raised when the path towards the model is invalid
+    """
+
+
 class BaseWorker(object):
     """
     Base class for Arkindex workers.
     """
 
-    def __init__(self, description="Arkindex Base Worker", support_cache=False):
+    def __init__(
+        self,
+        description: Optional[str] = "Arkindex Base Worker",
+        support_cache: Optional[bool] = False,
+    ):
         """
         Initialize the worker.
 
-        :param description str: Description shown in the ``worker-...`` command line tool.
-        :param support_cache bool: Whether or not this worker supports the cache database.
+        :param description: Description shown in the ``worker-...`` command line tool.
+        :param support_cache: Whether or not this worker supports the cache database.
            Override the constructor and set this parameter to start using the cache database.
         """
 
@@ -89,6 +100,12 @@ class BaseWorker(object):
             action="store_true",
             default=False,
         )
+        # To load models locally
+        self.parser.add_argument(
+            "--model-dir",
+            help=("The path to a local model's directory (development only)."),
+            type=Path,
+        )
 
         # Call potential extra arguments
         self.add_arguments()
@@ -105,6 +122,10 @@ class BaseWorker(object):
             self.work_dir = os.path.join(xdg_data_home, "arkindex")
             os.makedirs(self.work_dir, exist_ok=True)
 
+        # Store task ID. This is only available when running in production
+        # through a ponos agent
+        self.task_id = os.environ.get("PONOS_TASK")
+
         self.worker_version_id = os.environ.get("WORKER_VERSION_ID")
         if not self.worker_version_id:
             logger.warning(
@@ -119,6 +140,9 @@ class BaseWorker(object):
         logger.info(f"Worker will use {self.work_dir} as working directory")
 
         self.process_information = None
+        # corpus_id will be updated in configure() using the worker_run's corpus
+        # or in configure_for_developers() from the environment
+        self.corpus_id = None
         self.user_configuration = {}
         self.support_cache = support_cache
         # use_cache will be updated in configure() if the cache is supported and if there
@@ -134,8 +158,7 @@ class BaseWorker(object):
         Whether or not the worker can publish data.
 
         :returns: False when dev mode is enabled with the ``--dev`` CLI argument,
-           or when no worker version ID is provided.
-        :rtype: bool
+            when no worker version ID is provided or when no worker run ID is provided
         """
         return (
             self.args.dev
@@ -144,11 +167,18 @@ class BaseWorker(object):
         )
 
     def setup_api_client(self):
+        """
+        Create an ArkindexClient to make API requests towards Arkindex instances.
+        """
         # Build Arkindex API client from environment variables
         self.api_client = ArkindexClient(**options_from_env())
         logger.debug(f"Setup Arkindex API client on {self.api_client.document.url}")
 
     def configure_for_developers(self):
+        """
+        Setup the necessary configuration needed when working in `read_only` mode.
+        This is the method called when running a worker locally.
+        """
         assert self.is_read_only
         # Setup logging level if verbose or if ARKINDEX_DEBUG is set to true
         if self.args.verbose or os.environ.get("ARKINDEX_DEBUG"):
@@ -169,12 +199,16 @@ class BaseWorker(object):
             required_secrets = []
             logger.warning("Running without any extra configuration")
 
+        # Define corpus_id from environment
+        self.corpus_id = os.environ.get("ARKINDEX_CORPUS_ID")
+
         # Load all required secrets
         self.secrets = {name: self.load_secret(name) for name in required_secrets}
 
     def configure(self):
         """
-        Configure worker using CLI args and environment variables.
+        Setup the necessary configuration needed using CLI args and environment variables.
+        This is the method called when running a worker on Arkindex.
         """
         assert not self.is_read_only
         # Setup logging level if verbose or if ARKINDEX_DEBUG is set to true
@@ -188,6 +222,9 @@ class BaseWorker(object):
         # Load process information
         self.process_information = worker_run["process"]
 
+        # Load corpus id
+        self.corpus_id = worker_run["process"]["corpus"]
+
         # Load worker version information
         worker_version = worker_run["worker_version"]
         self.worker_details = worker_version["worker"]
@@ -211,23 +248,24 @@ class BaseWorker(object):
 
         # Load worker run configuration when available
         worker_configuration = worker_run.get("configuration")
-        self.user_configuration = (
-            worker_configuration.get("configuration") if worker_configuration else None
-        )
-        if self.user_configuration:
+        if worker_configuration and worker_configuration.get("configuration"):
             logger.info("Loaded user configuration from WorkerRun")
-            # if debug mode is set to true activate debug mode in logger
-            if self.user_configuration.get("debug"):
-                logger.setLevel(logging.DEBUG)
-                logger.debug("Debug output enabled")
+            self.user_configuration.update(worker_configuration.get("configuration"))
+
+        # if debug mode is set to true activate debug mode in logger
+        if self.user_configuration.get("debug"):
+            logger.setLevel(logging.DEBUG)
+            logger.debug("Debug output enabled")
 
     def configure_cache(self):
-        task_id = os.environ.get("PONOS_TASK")
+        """
+        Setup the necessary attribute when using the cache system of `Base-Worker`.
+        """
         paths = None
         if self.support_cache and self.args.database is not None:
             self.use_cache = True
-        elif self.support_cache and task_id:
-            task = self.request("RetrieveTaskFromAgent", id=task_id)
+        elif self.support_cache and self.task_id:
+            task = self.request("RetrieveTaskFromAgent", id=self.task_id)
             paths = retrieve_parents_cache_path(
                 task["parents"],
                 data_dir=os.environ.get("PONOS_DATA", "/data"),
@@ -242,7 +280,9 @@ class BaseWorker(object):
                 ), f"Database in {self.args.database} does not exist"
                 self.cache_path = self.args.database
             else:
-                cache_dir = os.path.join(os.environ.get("PONOS_DATA", "/data"), task_id)
+                cache_dir = os.path.join(
+                    os.environ.get("PONOS_DATA", "/data"), self.task_id
+                )
                 assert os.path.isdir(cache_dir), f"Missing task cache in {cache_dir}"
                 self.cache_path = os.path.join(cache_dir, "db.sqlite")
 
@@ -261,11 +301,11 @@ class BaseWorker(object):
         else:
             logger.debug("Cache is disabled")
 
-    def load_secret(self, name):
+    def load_secret(self, name: str):
         """
         Load a Ponos secret by name.
 
-        :param str name: Name of the Ponos secret.
+        :param name: Name of the Ponos secret.
         :raises Exception: When the secret cannot be loaded from the API nor the local secrets directory.
         """
         secret = None
@@ -312,6 +352,35 @@ class BaseWorker(object):
         # By default give raw secret payload
         return secret
 
+    def find_model_directory(self) -> Path:
+        """
+        Find the local path to the model. This supports two modes:
+        - the worker runs in ponos, the model is available at `/data/current`
+        - the worker runs locally, the developer may specify it using either
+           - the `model_dir` configuration parameter
+           - the `--model-dir` CLI parameter
+
+        :return: Path to the model on disk
+        """
+        if self.task_id:
+            # When running in production with ponos, the agent
+            # downloads the model and set it in the current task work dir
+            return Path(self.work_dir)
+        else:
+            model_dir = self.config.get("model_dir", self.args.model_dir)
+            if model_dir is None:
+                raise ModelNotFoundError(
+                    "No path to the model was provided. "
+                    "Please provide model_dir either through configuration "
+                    "or as CLI argument."
+                )
+            model_dir = Path(model_dir)
+            if not model_dir.exists():
+                raise ModelNotFoundError(
+                    f"The path {model_dir} does not link to any directory"
+                )
+            return model_dir
+
     @retry(
         retry=retry_if_exception(_is_500_error),
         wait=wait_exponential(multiplier=2, min=3),

arkindex_worker/worker/classification.py

@@ -3,7 +3,7 @@
 ElementsWorker methods for classifications and ML classes.
 """
 
-import os
+from typing import Dict, List, Optional, Union
 
 from apistar.exceptions import ErrorResponse
 from peewee import IntegrityError
@@ -14,50 +14,38 @@ from arkindex_worker.models import Element
 
 
 class ClassificationMixin(object):
-    """
-    Mixin for the :class:`ElementsWorker` to add ``MLClass`` and ``Classification`` helpers.
-    """
-
-    def load_corpus_classes(self, corpus_id):
+    def load_corpus_classes(self):
         """
-        Load all ML classes for the given corpus ID and store them in the ``self.classes`` cache.
-
-        :param corpus_id str: ID of the corpus.
+        Load all ML classes available in the worker's corpus and store them in the ``self.classes`` cache.
         """
         corpus_classes = self.api_client.paginate(
             "ListCorpusMLClasses",
-            id=corpus_id,
+            id=self.corpus_id,
         )
-        self.classes[corpus_id] = {
+        self.classes[self.corpus_id] = {
             ml_class["name"]: ml_class["id"] for ml_class in corpus_classes
         }
-        logger.info(f"Loaded {len(self.classes[corpus_id])} ML classes")
+        logger.info(f"Loaded {len(self.classes[self.corpus_id])} ML classes")
 
-    def get_ml_class_id(self, corpus_id, ml_class):
+    def get_ml_class_id(self, ml_class: str) -> str:
         """
         Return the MLClass ID corresponding to the given class name on a specific corpus.
 
         If no MLClass exists for this class name, a new one is created.
-
-        :param corpus_id: ID of the corpus, or None to use the ``ARKINDEX_CORPUS_ID`` environment variable.
-        :type corpus_id: str or None
-        :param ml_class str: Name of the MLClass.
-        :returns str: ID of the retrieved or created MLClass.
+        :param ml_class: Name of the MLClass.
+        :returns: ID of the retrieved or created MLClass.
         """
-        if corpus_id is None:
-            corpus_id = os.environ.get("ARKINDEX_CORPUS_ID")
+        if not self.classes.get(self.corpus_id):
+            self.load_corpus_classes()
 
-        if not self.classes.get(corpus_id):
-            self.load_corpus_classes(corpus_id)
-
-        ml_class_id = self.classes[corpus_id].get(ml_class)
+        ml_class_id = self.classes[self.corpus_id].get(ml_class)
         if ml_class_id is None:
-            logger.info(f"Creating ML class {ml_class} on corpus {corpus_id}")
+            logger.info(f"Creating ML class {ml_class} on corpus {self.corpus_id}")
             try:
                 response = self.request(
-                    "CreateMLClass", id=corpus_id, body={"name": ml_class}
+                    "CreateMLClass", id=self.corpus_id, body={"name": ml_class}
                 )
-                ml_class_id = self.classes[corpus_id][ml_class] = response["id"]
+                ml_class_id = self.classes[self.corpus_id][ml_class] = response["id"]
                 logger.debug(f"Created ML class {response['id']}")
             except ErrorResponse as e:
                 # Only reload for 400 errors
@@ -68,26 +56,29 @@ class ClassificationMixin(object):
                 logger.info(
                     f"Reloading corpus classes to see if {ml_class} already exists"
                 )
-                self.load_corpus_classes(corpus_id)
+                self.load_corpus_classes()
                 assert (
-                    ml_class in self.classes[corpus_id]
+                    ml_class in self.classes[self.corpus_id]
                 ), "Missing class {ml_class} even after reloading"
-                ml_class_id = self.classes[corpus_id][ml_class]
+                ml_class_id = self.classes[self.corpus_id][ml_class]
 
         return ml_class_id
 
     def create_classification(
-        self, element, ml_class, confidence, high_confidence=False
-    ):
+        self,
+        element: Union[Element, CachedElement],
+        ml_class: str,
+        confidence: float,
+        high_confidence: Optional[bool] = False,
+    ) -> Dict[str, str]:
         """
         Create a classification on the given element through the API.
 
         :param element: The element to create a classification on.
-        :type element: Element or CachedElement
-        :param ml_class str: Name of the MLClass to use.
-        :param confidence float: Confidence score for the classification. Must be between 0 and 1.
-        :param high_confidence bool: Whether or not the classification is of high confidence.
-        :returns dict: The created classification, as returned by the ``CreateClassification`` API endpoint.
+        :param ml_class: Name of the MLClass to use.
+        :param confidence: Confidence score for the classification. Must be between 0 and 1.
+        :param high_confidence: Whether or not the classification is of high confidence.
+        :returns: The created classification, as returned by the ``CreateClassification`` API endpoint.
         """
         assert element and isinstance(
             element, (Element, CachedElement)
@@ -112,7 +103,7 @@ class ClassificationMixin(object):
                 "CreateClassification",
                 body={
                     "element": str(element.id),
-                    "ml_class": self.get_ml_class_id(None, ml_class),
+                    "ml_class": self.get_ml_class_id(ml_class),
                     "worker_version": self.worker_version_id,
                     "confidence": confidence,
                     "high_confidence": high_confidence,
@@ -157,25 +148,22 @@ class ClassificationMixin(object):
 
         return created
 
-    def create_classifications(self, element, classifications):
+    def create_classifications(
+        self,
+        element: Union[Element, CachedElement],
+        classifications: List[Dict[str, Union[str, float, bool]]],
+    ) -> List[Dict[str, Union[str, float, bool]]]:
         """
         Create multiple classifications at once on the given element through the API.
 
         :param element: The element to create classifications on.
-        :type element: Element or CachedElement
-        :param classifications: The classifications to create, as a list of dicts with the following keys:
-
-           class_name (str)
-             Name of the MLClass for this classification.
-           confidence (float)
-             Confidence score, between 0 and 1.
-           high_confidence (bool)
-             High confidence state of the classification.
+        :param classifications: The classifications to create, a list of dicts. Each of them contains
+            a **class_name** (str), the name of the MLClass for this classification;
+            a **confidence** (float), the confidence score, between 0 and 1;
+            a **high_confidence** (bool), the high confidence state of the classification.
 
-        :type classifications: List[Dict[str, Union[str, float, bool]]]
         :returns: List of created classifications, as returned in the ``classifications`` field by
            the ``CreateClassifications`` API endpoint.
-        :rtype: List[Dict[str, Union[str, float, bool]]]
         """
         assert element and isinstance(
             element, (Element, CachedElement)

arkindex_worker/worker/element.py

@@ -2,17 +2,23 @@
 """
 ElementsWorker methods for elements and element types.
 """
-
-import uuid
 from typing import Dict, Iterable, List, NamedTuple, Optional, Union
 
 from peewee import IntegrityError
 
 from arkindex_worker import logger
 from arkindex_worker.cache import CachedElement, CachedImage
-from arkindex_worker.models import Corpus, Element
+from arkindex_worker.models import Element
+
+
+class ElementType(NamedTuple):
+    """
+    Arkindex Type of an element
+    """
 
-ElementType = NamedTuple("ElementType", name=str, slug=str, is_folder=bool)
+    name: str
+    slug: str
+    is_folder: bool
 
 
 class MissingTypeError(Exception):
@@ -22,15 +28,11 @@ class MissingTypeError(Exception):
 
 
 class ElementMixin(object):
-    """
-    Mixin for the :class:`ElementsWorker` to provide ``Element`` helpers.
-    """
-
-    def create_required_types(self, corpus: Corpus, element_types: List[ElementType]):
+    def create_required_types(self, element_types: List[ElementType]):
         """Creates given element types in the corpus.
 
         :param Corpus corpus: The corpus to create types on.
-        :param List[ElementType] element_types: The missing element types to create.
+        :param element_types: The missing element types to create.
         """
         for element_type in element_types:
             self.request(
@@ -39,47 +41,42 @@ class ElementMixin(object):
                     "slug": element_type.slug,
                     "display_name": element_type.name,
                     "folder": element_type.is_folder,
-                    "corpus": corpus.id,
+                    "corpus": self.corpus_id,
                 },
             )
             logger.info(f"Created a new element type with slug {element_type.slug}")
 
     def check_required_types(
-        self, corpus_id: str, *type_slugs: str, create_missing: bool = False
+        self, *type_slugs: str, create_missing: bool = False
     ) -> bool:
         """
         Check that a corpus has a list of required element types,
         and raise an exception if any of them are missing.
 
-        :param str corpus_id: ID of the corpus to check types on.
-        :param str \\*type_slugs: Type slugs to look for.
-        :param bool create_missing: Whether missing types should be created.
-        :returns bool: True if all of the specified type slugs have been found.
+        :param *type_slugs: Type slugs to look for.
+        :param create_missing: Whether missing types should be created.
+        :returns: Whether all of the specified type slugs have been found.
         :raises MissingTypeError: If any of the specified type slugs were not found.
         """
-        assert isinstance(
-            corpus_id, (uuid.UUID, str)
-        ), "Corpus ID should be a string or UUID"
         assert len(type_slugs), "At least one element type slug is required."
         assert all(
             isinstance(slug, str) for slug in type_slugs
         ), "Element type slugs must be strings."
 
-        corpus = Corpus(self.request("RetrieveCorpus", id=corpus_id))
-        available_slugs = {element_type.slug for element_type in corpus.types}
+        corpus = self.request("RetrieveCorpus", id=self.corpus_id)
+        available_slugs = {element_type["slug"] for element_type in corpus["types"]}
         missing_slugs = set(type_slugs) - available_slugs
 
         if missing_slugs:
             if create_missing:
                 self.create_required_types(
-                    corpus,
                     element_types=[
                         ElementType(slug, slug, False) for slug in missing_slugs
                     ],
                 )
             else:
                 raise MissingTypeError(
-                    f'Element type(s) {", ".join(sorted(missing_slugs))} were not found in the {corpus.name} corpus ({corpus.id}).'
+                    f'Element type(s) {", ".join(sorted(missing_slugs))} were not found in the {corpus["name"]} corpus ({corpus["id"]}).'
                 )
 
         return True
@@ -91,19 +88,17 @@ class ElementMixin(object):
         name: str,
         polygon: List[List[Union[int, float]]],
         confidence: Optional[float] = None,
-        slim_output: bool = True,
+        slim_output: Optional[bool] = True,
     ) -> str:
         """
         Create a child element on the given element through the API.
 
         :param Element element: The parent element.
-        :param str type: Slug of the element type for this child element.
-        :param str name: Name of the child element.
+        :param type: Slug of the element type for this child element.
+        :param name: Name of the child element.
         :param polygon: Polygon of the child element.
-        :type polygon: list(list(int or float))
         :param confidence: Optional confidence score, between 0.0 and 1.0.
-        :type confidence: float or None
-        :returns str: UUID of the created element.
+        :returns: UUID of the created element.
         """
         assert element and isinstance(
             element, Element
@@ -162,7 +157,6 @@ class ElementMixin(object):
         Create child elements on the given element in a single API request.
 
         :param parent: Parent element for all the new child elements. The parent must have an image and a polygon.
-        :type parent: Element or CachedElement
         :param elements: List of dicts, one per element. Each dict can have the following keys:
 
             name (str)
@@ -178,9 +172,7 @@ class ElementMixin(object):
             confidence (float or None)
                 Optional confidence score, between 0.0 and 1.0.
 
-        :type elements: list(dict(str, Any))
         :return: List of dicts, with each dict having a single key, ``id``, holding the UUID of each created element.
-        :rtype: list(dict(str, str))
         """
         if isinstance(parent, Element):
             assert parent.get(
@@ -301,38 +293,27 @@ class ElementMixin(object):
         List children of an element.
 
         :param element: Parent element to find children of.
-        :type element: Union[Element, CachedElement]
         :param folder: Restrict to or exclude elements with folder types.
            This parameter is not supported when caching is enabled.
-        :type folder: Optional[bool]
         :param name: Restrict to elements whose name contain a substring (case-insensitive).
            This parameter is not supported when caching is enabled.
-        :type name: Optional[str]
         :param recursive: Look for elements recursively (grand-children, etc.)
            This parameter is not supported when caching is enabled.
-        :type recursive: Optional[bool]
         :param type: Restrict to elements with a specific type slug
            This parameter is not supported when caching is enabled.
-        :type type: Optional[str]
         :param with_classes: Include each element's classifications in the response.
            This parameter is not supported when caching is enabled.
-        :type with_classes: Optional[bool]
         :param with_corpus: Include each element's corpus in the response.
            This parameter is not supported when caching is enabled.
-        :type with_corpus: Optional[bool]
         :param with_has_children: Include the ``has_children`` attribute in the response,
            indicating if this element has child elements of its own.
            This parameter is not supported when caching is enabled.
-        :type with_has_children: Optional[bool]
         :param with_zone: Include the ``zone`` attribute in the response,
            holding the element's image and polygon.
            This parameter is not supported when caching is enabled.
-        :type with_zone: Optional[bool]
         :param worker_version: Restrict to elements created by a worker version with this UUID.
-        :type worker_version: Optional[Union[str, bool]]
         :return: An iterable of dicts from the ``ListElementChildren`` API endpoint,
-           or an iterable of :class:`CachedElement` when caching is enabled.
-        :rtype: Union[Iterable[dict], Iterable[CachedElement]]
+           or an iterable of [CachedElement][arkindex_worker.cache.CachedElement] when caching is enabled.
         """
         assert element and isinstance(
             element, (Element, CachedElement)

arkindex_worker/worker/entity.py

@@ -3,8 +3,8 @@
 ElementsWorker methods for entities.
 """
 
-import os
 from enum import Enum
+from typing import Dict, Optional, Union
 
 from peewee import IntegrityError
 
@@ -28,29 +28,23 @@ class EntityType(Enum):
 
 
 class EntityMixin(object):
-    """
-    Mixin for the :class:`ElementsWorker` to add ``Entity`` helpers.
-    """
-
     def create_entity(
-        self, element, name, type, corpus=None, metas=dict(), validated=None
+        self,
+        element: Union[Element, CachedElement],
+        name: str,
+        type: EntityType,
+        metas=dict(),
+        validated=None,
     ):
         """
         Create an entity on the given corpus.
-        If cache support is enabled, a :class:`CachedEntity` will also be created.
+        If cache support is enabled, a [CachedEntity][arkindex_worker.cache.CachedEntity] will also be created.
 
-        :param element: An element on which the entity will be reported with the :class:`Reporter`.
+        :param element: An element on which the entity will be reported with the [Reporter][arkindex_worker.reporting.Reporter].
            This does not have any effect on the entity itself.
-        :type element: Element or CachedElement
-        :param name str: Name of the entity.
-        :param type EntityType: Type of the entity.
-        :param corpus: UUID of the corpus to create an entity on, or None to use the
-           value of the ``ARKINDEX_CORPUS_ID`` environment variable.
-        :type corpus: str or None
+        :param name: Name of the entity.
+        :param type: Type of the entity.
         """
-        if corpus is None:
-            corpus = os.environ.get("ARKINDEX_CORPUS_ID")
-
         assert element and isinstance(
             element, (Element, CachedElement)
         ), "element shouldn't be null and should be an Element or CachedElement"
@@ -60,9 +54,6 @@ class EntityMixin(object):
         assert type and isinstance(
             type, EntityType
         ), "type shouldn't be null and should be of type EntityType"
-        assert corpus and isinstance(
-            corpus, str
-        ), "corpus shouldn't be null and should be of type str"
         if metas:
             assert isinstance(metas, dict), "metas should be of type dict"
         if validated is not None:
@@ -78,7 +69,7 @@ class EntityMixin(object):
                 "type": type.value,
                 "metas": metas,
                 "validated": validated,
-                "corpus": corpus,
+                "corpus": self.corpus_id,
                 "worker_version": self.worker_version_id,
             },
         )
@@ -104,22 +95,25 @@ class EntityMixin(object):
         return entity["id"]
 
     def create_transcription_entity(
-        self, transcription, entity, offset, length, confidence=None
-    ):
+        self,
+        transcription: str,
+        entity: str,
+        offset: int,
+        length: int,
+        confidence: Optional[float] = None,
+    ) -> Optional[Dict[str, Union[str, int]]]:
         """
         Create a link between an existing entity and an existing transcription.
-        If cache support is enabled, a :class:`CachedTranscriptionEntity` will also be created.
+        If cache support is enabled, a `CachedTranscriptionEntity` will also be created.
 
-        :param transcription str: UUID of the existing transcription.
-        :param entity str: UUID of the existing entity.
-        :param offset int: Starting position of the entity in the transcription's text,
+        :param transcription: UUID of the existing transcription.
+        :param entity: UUID of the existing entity.
+        :param offset: Starting position of the entity in the transcription's text,
            as a 0-based index.
-        :param length int: Length of the entity in the transcription's text.
+        :param length: Length of the entity in the transcription's text.
         :param confidence: Optional confidence score between 0 or 1.
-        :type confidence: float or None
         :returns: A dict as returned by the ``CreateTranscriptionEntity`` API endpoint,
            or None if the worker is in read-only mode.
-        :rtype: dict(str, str or int) or None
         """
         assert transcription and isinstance(
             transcription, str
@@ -178,14 +172,14 @@ class EntityMixin(object):
     def list_transcription_entities(
         self,
         transcription: Transcription,
-        worker_version: bool = None,
+        worker_version: Optional[Union[str, bool]] = None,
     ):
         """
         List existing entities on a transcription
         This method does not support cache
 
-        :param transcription Transcription: The transcription to list entities on.
-        :param worker_version str or bool: Restrict to entities created by a worker version with this UUID. Set to False to look for manually created transcriptions.
+        :param transcription: The transcription to list entities on.
+        :param worker_version: Restrict to entities created by a worker version with this UUID. Set to False to look for manually created transcriptions.
         """
         query_params = {}
         assert transcription and isinstance(
@@ -206,3 +200,28 @@ class EntityMixin(object):
         return self.api_client.paginate(
             "ListTranscriptionEntities", id=transcription.id, **query_params
         )
+
+    def list_corpus_entities(
+        self,
+        name: Optional[str] = None,
+        parent: Optional[Element] = None,
+    ):
+        """
+        List all entities in the worker's corpus
+        This method does not support cache
+        :param name: Filter entities by part of their name (case-insensitive)
+        :param parent Element: Restrict entities to those linked to all transcriptions of an element and all its descendants. Note that links to metadata are ignored.
+        """
+        query_params = {}
+
+        if name is not None:
+            assert name and isinstance(name, str), "name should be of type str"
+            query_params["name"] = name
+
+        if parent is not None:
+            assert isinstance(parent, Element), "parent should be of type Element"
+            query_params["parent"] = parent.id
+
+        return self.api_client.paginate(
+            "ListCorpusEntities", id=self.corpus_id, **query_params
+        )

arkindex_worker/worker/metadata.py

@@ -4,6 +4,7 @@ ElementsWorker methods for metadata.
 """
 
 from enum import Enum
+from typing import Dict, List, Optional, Union
 
 from arkindex_worker import logger
 from arkindex_worker.models import Element
@@ -56,21 +57,23 @@ class MetaType(Enum):
 
 
 class MetaDataMixin(object):
-    """
-    Mixin for the :class:`ElementsWorker` to add ``MetaData`` helpers.
-    """
-
-    def create_metadata(self, element, type, name, value, entity=None):
+    def create_metadata(
+        self,
+        element: Element,
+        type: MetaType,
+        name: str,
+        value: str,
+        entity: Optional[str] = None,
+    ) -> str:
         """
         Create a metadata on the given element through API.
 
-        :param element Element: The element to create a metadata on.
-        :param type MetaType: Type of the metadata.
-        :param name str: Name of the metadata.
-        :param value str: Value of the metadata.
+        :param element: The element to create a metadata on.
+        :param type: Type of the metadata.
+        :param name: Name of the metadata.
+        :param value: Value of the metadata.
         :param entity: UUID of an entity this metadata is related to.
-        :type entity: str or None
-        :returns str: UUID of the created metadata.
+        :returns: UUID of the created metadata.
         """
         assert element and isinstance(
             element, Element
@@ -108,8 +111,12 @@ class MetaDataMixin(object):
     def create_metadatas(
         self,
         element: Element,
-        metadatas: list,
-    ):
+        metadatas: List[
+            Dict[
+                str, Union[MetaType, str, Union[str, Union[int, float]], Optional[str]]
+            ]
+        ],
+    ) -> List[Dict[str, str]]:
         """
         Create multiple metadatas on an existing element.
         This method does not support cache.
@@ -180,12 +187,12 @@ class MetaDataMixin(object):
 
         return created_metadatas
 
-    def list_metadata(self, element: Element):
+    def list_element_metadata(self, element: Element) -> List[Dict[str, str]]:
         """
         List all metadata linked to an element.
         This method does not support cache.
 
-        :param element Element: The element to list metadata on.
+        :param element: The element to list metadata on.
         """
         assert element and isinstance(
             element, Element

arkindex_worker/worker/training.py

 # -*- coding: utf-8 -*-
+"""
+BaseWorker methods for training.
+"""
+
 import hashlib
 import os
 import tarfile
 import tempfile
 from contextlib import contextmanager
-from typing import NewType, Tuple
+from pathlib import Path
+from typing import NewType, Optional, Tuple
 
 import requests
 import zstandard as zstd
@@ -15,15 +20,24 @@ from arkindex_worker import logger
 CHUNK_SIZE = 1024
 
 DirPath = NewType("DirPath", str)
+"""Path to a directory"""
+
 Hash = NewType("Hash", str)
+"""MD5 Hash"""
+
 FileSize = NewType("FileSize", int)
-Archive = Tuple[DirPath, Hash, FileSize]
+"""File size"""
 
 
 @contextmanager
-def create_archive(path: DirPath) -> Archive:
-    """First create a tar archive, then compress to a zst archive.
-    Finally, get its hash and size
+def create_archive(path: DirPath) -> Tuple[Path, Hash, FileSize, Hash]:
+    """
+    Create a tar archive from the files at the given location then compress it to a zst archive.
+
+    Yield its location, its hash, its size and its content's hash.
+
+    :param path: Create a compressed tar archive from the files
+    :returns: The location of the created archive, its hash, its size and its content's hash
     """
     assert path.is_dir(), "create_archive needs a directory"
 
@@ -76,18 +90,29 @@ def create_archive(path: DirPath) -> Archive:
 
 
 class TrainingMixin(object):
-    """
-    Mixin for the Training workers to add Model and ModelVersion helpers
-    """
-
     def publish_model_version(
-        self, model_path: DirPath, model_id: str, tag: str = None, description: str = ""
+        self,
+        model_path: DirPath,
+        model_id: str,
+        tag: Optional[str] = None,
+        description: Optional[str] = None,
     ):
         """
         This method creates a model archive and its associated hash,
-        to create a unique version that will be stored on a bucket and published on arkindex.
+        to create a unique version that will be stored on a bucket and published on Arkindex.
+
+        :param model_path: Path to the directory containing the model version's files.
+        :param model_id: ID of the model
+        :param tag:
+        :param description:
         """
 
+        if self.is_read_only:
+            logger.warning(
+                "Cannot publish a new model version as this worker is in read-only mode"
+            )
+            return
+
         # Create the zst archive, get its hash and size
         with create_archive(path=model_path) as (
             path_to_archive,
@@ -131,33 +156,37 @@ class TrainingMixin(object):
         - The version is in `Created` state: this version's details is used
         - The version is in `Available` state: you cannot create twice the same version, an error is raised
         """
+        if self.is_read_only:
+            logger.warning(
+                "Cannot create a new model version as this worker is in read-only mode"
+            )
+            return
 
         # Create a new model version with hash and size
         try:
+            payload = {"hash": hash, "size": size, "archive_hash": archive_hash}
+            if tag:
+                payload["tag"] = tag
+            if description:
+                payload["description"] = description
             model_version_details = self.request(
                 "CreateModelVersion",
                 id=model_id,
-                body={
-                    "hash": hash,
-                    "size": size,
-                    "archive_hash": archive_hash,
-                    "tag": tag,
-                    "description": description,
-                },
+                body=payload,
             )
             logger.info(
                 f"Model version ({model_version_details['id']}) was created successfully"
             )
         except ErrorResponse as e:
-            if e.status_code >= 500:
+            model_version_details = (
+                e.content.get("hash") if hasattr(e, "content") else None
+            )
+            if e.status_code >= 500 or model_version_details is None:
                 logger.error(f"Failed to create model version: {e.content}")
-
-            model_version_details = e.content.get("hash")
+                raise e
             # If the existing model is in Created state, this model is returned as a dict.
             # Else an error in a list is returned.
-            if model_version_details and isinstance(
-                model_version_details, (list, tuple)
-            ):
+            if isinstance(model_version_details, (list, tuple)):
                 logger.error(model_version_details[0])
                 return
 
@@ -171,6 +200,11 @@ class TrainingMixin(object):
         """
         Upload the archive of the model's files to an Amazon s3 compatible storage
         """
+        if self.is_read_only:
+            logger.warning(
+                "Cannot upload this archive as this worker is in read-only mode"
+            )
+            return
 
         s3_put_url = model_version_details.get("s3_put_url")
         logger.info("Uploading to s3...")
@@ -191,6 +225,11 @@ class TrainingMixin(object):
         """
         Update the specified model version to the state `Available` and use the given information"
         """
+        if self.is_read_only:
+            logger.warning(
+                "Cannot update this model version as this worker is in read-only mode"
+            )
+            return
 
         model_version_id = model_version_details.get("id")
         logger.info(f"Updating model version ({model_version_id})")

arkindex_worker/worker/transcription.py

@@ -4,7 +4,7 @@ ElementsWorker methods for transcriptions.
 """
 
 from enum import Enum
-from typing import Iterable, Optional, Union
+from typing import Dict, Iterable, List, Optional, Union
 
 from peewee import IntegrityError
 
@@ -41,28 +41,22 @@ class TextOrientation(Enum):
 
 
 class TranscriptionMixin(object):
-    """
-    Mixin for the :class:`ElementsWorker` to provide ``Transcription`` helpers.
-    """
-
     def create_transcription(
         self,
-        element,
-        text,
-        confidence,
-        orientation=TextOrientation.HorizontalLeftToRight,
-    ):
+        element: Union[Element, CachedElement],
+        text: str,
+        confidence: float,
+        orientation: TextOrientation = TextOrientation.HorizontalLeftToRight,
+    ) -> Optional[Dict[str, Union[str, float]]]:
         """
         Create a transcription on the given element through the API.
 
         :param element: Element to create a transcription on.
-        :type element: Element or CachedElement
-        :param text str: Text of the transcription.
-        :param confidence float: Confidence score, between 0 and 1.
-        :param orientation TextOrientation: Orientation of the transcription's text.
+        :param text: Text of the transcription.
+        :param confidence: Confidence score, between 0 and 1.
+        :param orientation: Orientation of the transcription's text.
         :returns: A dict as returned by the ``CreateTranscription`` API endpoint,
            or None if the worker is in read-only mode.
-        :rtype: Dict[str, Union[str, float]] or None
         """
         assert element and isinstance(
             element, (Element, CachedElement)
@@ -117,21 +111,24 @@ class TranscriptionMixin(object):
 
         return created
 
-    def create_transcriptions(self, transcriptions):
+    def create_transcriptions(
+        self,
+        transcriptions: List[Dict[str, Union[str, float, Optional[TextOrientation]]]],
+    ) -> List[Dict[str, Union[str, float]]]:
         """
         Create multiple transcriptions at once on existing elements through the API,
-        and creates :class:`CachedTranscription` instances if cache support is enabled.
+        and creates [CachedTranscription][arkindex_worker.cache.CachedTranscription] instances if cache support is enabled.
 
         :param transcriptions: A list of dicts representing a transcription each, with the following keys:
 
-           element_id (str)
-              Required. UUID of the element to create this transcription on.
-           text (str)
-              Required. Text of the transcription.
-           confidence (float)
-              Required. Confidence score between 0 and 1.
-           orientation (:class:`TextOrientation`)
-              Optional. Orientation of the transcription's text.
+            element_id (str)
+                Required. UUID of the element to create this transcription on.
+            text (str)
+                Required. Text of the transcription.
+            confidence (float)
+                Required. Confidence score between 0 and 1.
+            orientation (TextOrientation)
+                Optional. Orientation of the transcription's text.
 
         :returns: A list of dicts as returned in the ``transcriptions`` field by the ``CreateTranscriptions`` API endpoint.
         """
@@ -203,23 +200,27 @@ class TranscriptionMixin(object):
 
         return created_trs
 
-    def create_element_transcriptions(self, element, sub_element_type, transcriptions):
+    def create_element_transcriptions(
+        self,
+        element: Union[Element, CachedElement],
+        sub_element_type: str,
+        transcriptions: List[Dict[str, Union[str, float]]],
+    ) -> Dict[str, Union[str, bool]]:
         """
         Create multiple elements and transcriptions at once on a single parent element through the API.
 
         :param element: Element to create elements and transcriptions on.
-        :type element: Element or CachedElement
-        :param str sub_element_type: Slug of the element type to use for the new elements.
+        :param sub_element_type: Slug of the element type to use for the new elements.
         :param transcriptions: A list of dicts representing an element and transcription each, with the following keys:
 
-           polygon (list(list(int or float)))
-              Required. Polygon of the element.
-           text (str)
-              Required. Text of the transcription.
-           confidence (float)
-              Required. Confidence score between 0 and 1.
-           orientation (:class:`TextOrientation`)
-              Optional. Orientation of the transcription's text.
+            polygon (list(list(int or float)))
+                Required. Polygon of the element.
+            text (str)
+                Required. Text of the transcription.
+            confidence (float)
+                Required. Confidence score between 0 and 1.
+            orientation ([TextOrientation][arkindex_worker.worker.transcription.TextOrientation])
+                Optional. Orientation of the transcription's text.
 
         :returns: A list of dicts as returned by the ``CreateElementTranscriptions`` API endpoint.
         """
@@ -359,16 +360,11 @@ class TranscriptionMixin(object):
         List transcriptions on an element.
 
         :param element: The element to list transcriptions on.
-        :type element: Element or CachedElement
         :param element_type: Restrict to transcriptions whose elements have an element type with this slug.
-        :type element_type: Optional[str]
         :param recursive: Include transcriptions of any descendant of this element, recursively.
-        :type recursive: Optional[bool]
         :param worker_version: Restrict to transcriptions created by a worker version with this UUID. Set to False to look for manually created transcriptions.
-        :type worker_version: Optional[Union[str, bool]]
         :returns: An iterable of dicts representing each transcription,
            or an iterable of CachedTranscription when cache support is enabled.
-        :rtype: Union[Iterable[dict], Iterable[CachedTranscription]]
         """
         assert element and isinstance(
             element, (Element, CachedElement)

arkindex_worker/worker/version.py

@@ -5,16 +5,12 @@ ElementsWorker methods for worker versions.
 
 
 class WorkerVersionMixin(object):
-    """
-    Mixin for the :class:`ElementsWorker` to provide ``WorkerVersion`` helpers.
-    """
-
     def get_worker_version(self, worker_version_id: str) -> dict:
         """
-        Retrieve a worker version, using the :class:`ElementsWorker`'s internal cache when possible.
+        Retrieve a worker version, using the [ElementsWorker][arkindex_worker.worker.ElementsWorker]'s internal cache when possible.
 
-        :param str worker_version_id: ID of the worker version to retrieve.
-        :returns dict: The requested worker version, as returned by the ``RetrieveWorkerVersion`` API endpoint.
+        :param worker_version_id: ID of the worker version to retrieve.
+        :returns: The requested worker version, as returned by the ``RetrieveWorkerVersion`` API endpoint.
         """
         if worker_version_id is None:
             raise ValueError("No worker version ID")
@@ -32,8 +28,8 @@ class WorkerVersionMixin(object):
         Retrieve the slug of the worker of a worker version, from a worker version UUID.
         Uses a worker version from the internal cache if possible, otherwise makes an API request.
 
-        :param worker_version_id str: ID of the worker version to find a slug for.
-        :returns str: Slug of the worker of this worker version.
+        :param worker_version_id: ID of the worker version to find a slug for.
+        :returns: Slug of the worker of this worker version.
         """
         worker_version = self.get_worker_version(worker_version_id)
         return worker_version["worker"]["slug"]