### Kaldi and kraken training data generator

This script downloads pages with transcriptions from Arkindex
and converts data to Kaldi format or kraken format. It also generates train, val and test splits.

### Using the script

#### common for both modules

`ARKINDEX_API_TOKEN` and `ARKINDEX_API_URL` environment variables must be defined.

Install it as a package
```bash
virtualenv -p python3 .env
source .env/bin/activate
pip install -e .
```

Use help to list possible parameters:
```bash
kaldi-data-generator --help
```

There is also an option that skips all vertical transcriptions and it is `--skip_vertical_lines`
#### Kaldi format
Simple example:
```bash
kaldi-data-generator -f kaldi --dataset_name my_balsac --out_dir /tmp/balsac/ --volumes 8f4005e9-1921-47b0-be7b-e27c7fd29486  d2f7c563-1622-4721-bd51-96fab97189f7
```

With corpus ids
```bash
kaldi-data-generator -f kaldi --dataset_name cz --out_dir /tmp/home_cz/ --corpora 1ed45e94-9108-4029-a529-9abe37f55ba0
```

Polygon example:
```bash
kaldi-data-generator -f kaldi --dataset_name my_balsac2 --extraction_mode polygon --out_dir /tmp/balsac/ --pages 50e1c3c0-2fe9-4216-805e-1a2fd2e7e9f4
```

The script creates 3 directories `Lines`, `Transcriptions`, `Partitions` in the specified `out_dir`.
The contents of these directories must be copied (or symlinked) to the corresponding directories in `data/local/` of kaldi recipe.

### Kraken format

simple examples:
```
$ kaldi-data-generator -f kraken -o <output_dir> --volumes <volume_id> --no_split
```
For instance to download the 4 sets from IAM (2 validation set on Arkindex) in 3 directories :
```
$ kaldi-data-generator -f kraken -o iam_training --volumes e7a95479-e5fc-4b20-830c-0c6e38bf8f72 --no_split
$ kaldi-data-generator -f kraken -o iam_validation --volumes edc78ee1-09e0-4671-806b-5fc0392707d9 --no_split
$ kaldi-data-generator -f kraken -o iam_validation --volumes fefbbfca-a6dd-4e00-8797-0d4628cb024d --no_split
$ kaldi-data-generator -f kraken -o iam_test --volumes 0ce2b631-01d7-49bf-b213-ceb6eae74a9b --no_split
```