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Load a language model and decode with it during evaluation

Merged Load a language model and decode with it during evaluation
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@@ -17,23 +17,33 @@ To determine the value to use for `dataset.max_char_prediction`, you can use the
## Model parameters
| Name | Description | Type | Default |
| ----------------------------------- | ---------------------------------------------------------------------------------- | ------- | ------- |
| `model.transfered_charset` | Transfer learning of the decision layer based on charset of the model to transfer. | `bool` | `True` |
| `model.additional_tokens` | For decision layer = \[<eot>, \], only for transferred charset. | `int` | `1` |
| `model.encoder.dropout` | Dropout probability in the encoder. | `float` | `0.5` |
| `model.encoder.nb_layers` | Number of layers in the encoder. | `int` | `5` |
| `model.h_max` | Maximum height for encoder output (for 2D positional embedding). | `int` | `500` |
| `model.w_max` | Maximum width for encoder output (for 2D positional embedding). | `int` | `1000` |
| `model.decoder.enc_dim` | Dimension of features extracted by the encoder. | `int` | `256` |
| `model.decoder.l_max` | Maximum predicted sequence length (for 1D positional embedding). | `int` | `15000` |
| `model.decoder.dec_num_layers` | Number of transformer decoder layers. | `int` | `8` |
| `model.decoder.dec_num_heads` | Number of heads in transformer decoder layers. | `int` | `4` |
| `model.decoder.dec_res_dropout` | Dropout probability in transformer decoder layers. | `float` | `0.1` |
| `model.decoder.dec_pred_dropout` | Dropout rate before decision layer. | `float` | `0.1` |
| `model.decoder.dec_att_dropout` | Dropout rate in multi head attention. | `float` | `0.1` |
| `model.decoder.dec_dim_feedforward` | Number of dimensions for feedforward layer in transformer decoder layers. | `int` | `256` |
| `model.decoder.attention_win` | Length of attention window. | `int` | `100` |
| Name | Description | Type | Default |
| -------------------------- | ---------------------------------------------------------------------------------- | ------ | ------- |
| `model.transfered_charset` | Transfer learning of the decision layer based on charset of the model to transfer. | `bool` | `True` |
| `model.additional_tokens` | For decision layer = \[<eot>, \], only for transferred charset. | `int` | `1` |
| `model.h_max` | Maximum height for encoder output (for 2D positional embedding). | `int` | `500` |
| `model.w_max` | Maximum width for encoder output (for 2D positional embedding). | `int` | `1000` |
### Encoder
| Name | Description | Type | Default |
| ------------------------- | ----------------------------------- | ------- | ------- |
| `model.encoder.dropout` | Dropout probability in the encoder. | `float` | `0.5` |
| `model.encoder.nb_layers` | Number of layers in the encoder. | `int` | `5` |
### Decoder
| Name | Description | Type | Default |
| ----------------------------------- | ------------------------------------------------------------------------- | ------- | ------- |
| `model.decoder.enc_dim` | Dimension of features extracted by the encoder. | `int` | `256` |
| `model.decoder.l_max` | Maximum predicted sequence length (for 1D positional embedding). | `int` | `15000` |
| `model.decoder.dec_num_layers` | Number of transformer decoder layers. | `int` | `8` |
| `model.decoder.dec_num_heads` | Number of heads in transformer decoder layers. | `int` | `4` |
| `model.decoder.dec_res_dropout` | Dropout probability in transformer decoder layers. | `float` | `0.1` |
| `model.decoder.dec_pred_dropout` | Dropout rate before decision layer. | `float` | `0.1` |
| `model.decoder.dec_att_dropout` | Dropout rate in multi head attention. | `float` | `0.1` |
| `model.decoder.dec_dim_feedforward` | Number of dimensions for feedforward layer in transformer decoder layers. | `int` | `256` |
| `model.decoder.attention_win` | Length of attention window. | `int` | `100` |
### Language model
@@ -63,38 +73,74 @@ folder/
## Training parameters
| Name | Description | Type | Default |
| ------------------------------------------------ | --------------------------------------------------------------------------------------------------------------------------- | ------------ | --------------------------------------------------------------------------- |
| `training.data.batch_size` | Mini-batch size for the training loop. | `int` | `2` |
| `training.data.load_in_memory` | Load all images in CPU memory. | `bool` | `True` |
| `training.data.worker_per_gpu` | Number of parallel processes per gpu for data loading. | `int` | `4` |
| `training.data.preprocessings` | List of pre-processing functions to apply to input images. | `list` | (see [dedicated section](#data-preprocessing)) |
| `training.data.augmentation` | Whether to use data augmentation on the training set. | `bool` | `True` (see [dedicated section](#data-augmentation)) |
| `training.output_folder` | Directory for checkpoint and results. | `str` | |
| `training.max_nb_epochs` | Maximum number of epochs before stopping training. | `int` | `800` |
| `training.load_epoch` | Model to load. Should be either `"best"` (evaluation) or `last` (training). | `str` | `"last"` |
| `training.device.use_ddp` | Whether to use DistributedDataParallel. | `bool` | `False` |
| `training.device.ddp_port` | DDP port. | `int` | `20027` |
| `training.device.use_amp` | Whether to enable automatic mix-precision. | `bool` | `True` |
| `training.device.nb_gpu` | Number of GPUs to train DAN. Set to `null` to use all GPUs available. | `int` | |
| `training.device.force` | Use a specific device if available. Use `cpu` to train on CPU (for debugging) or `cuda`/`cuda:$gpu_device` to train on GPU. | `str` | |
| `training.optimizers.all.args.lr` | Learning rate for the optimizer. | `float` | `0.0001` |
| `training.optimizers.all.args.amsgrad` | Whether to use AMSGrad optimization. | `bool` | `False` |
| `training.lr_schedulers` | Learning rate schedulers. | custom class | |
| `training.validation.eval_on_valid` | Whether to evaluate and log metrics on the validation set during training. | `bool` | `True` |
| `training.validation.eval_on_valid_interval` | Interval (in epochs) to evaluate during training. | `int` | `5` |
| `training.validation.set_name_focus_metric` | Dataset to focus on to select best weights. | `str` | |
| `training.metrics.train` | List of metrics to compute during training. | `list` | `["loss_ce", "cer", "cer_no_token", "wer", "wer_no_punct", "wer_no_token"]` |
| `training.metrics.eval` | List of metrics to compute during validation. | `list` | `["cer", "cer_no_token", "wer", "wer_no_punct", "wer_no_token"]` |
| `training.label_noise_scheduler.min_error_rate` | Minimum ratio of teacher forcing. | `float` | `0.2` |
| `training.label_noise_scheduler.max_error_rate` | Maximum ratio of teacher forcing. | `float` | `0.2` |
| `training.label_noise_scheduler.total_num_steps` | Number of steps before stopping teacher forcing. | `float` | `5e4` |
| `training.transfer_learning.encoder` | Model to load for the encoder \[state_dict_name, checkpoint_path, learnable, strict\]. | `list` | `["encoder", "pretrained_models/dan_rimes_page.pt", True, True]` |
| `training.transfer_learning.decoder` | Model to load for the decoder \[state_dict_name, checkpoint_path, learnable, strict\]. | `list` | `["decoder", "pretrained_models/dan_rimes_page.pt", True, False]` |
- To train on several GPUs, simply set the `training.use_ddp` parameter to `True`. By default, the model will use all available GPUs. To restrict access to fewer GPUs, one can modify the `training.nb_gpu` parameter.
| Name | Description | Type | Default |
| ------------------------ | --------------------------------------------------------------------------- | ------------ | -------- |
| `training.output_folder` | Directory for checkpoint and results. | `str` | |
| `training.max_nb_epochs` | Maximum number of epochs before stopping training. | `int` | `800` |
| `training.load_epoch` | Model to load. Should be either `"best"` (evaluation) or `last` (training). | `str` | `"last"` |
| `training.lr_schedulers` | Learning rate schedulers. | custom class | |
### Data
| Name | Description | Type | Default |
| ------------------------------ | ---------------------------------------------------------- | ------ | ---------------------------------------------------- |
| `training.data.batch_size` | Mini-batch size for the training loop. | `int` | `2` |
| `training.data.load_in_memory` | Load all images in CPU memory. | `bool` | `True` |
| `training.data.worker_per_gpu` | Number of parallel processes per gpu for data loading. | `int` | `4` |
| `training.data.preprocessings` | List of pre-processing functions to apply to input images. | `list` | (see [dedicated section](#data-preprocessing)) |
| `training.data.augmentation` | Whether to use data augmentation on the training set. | `bool` | `True` (see [dedicated section](#data-augmentation)) |
### Device
| Name | Description | Type | Default |
| -------------------------- | --------------------------------------------------------------------------------------------------------------------------- | ------ | ------- |
| `training.device.use_ddp` | Whether to use DistributedDataParallel. | `bool` | `False` |
| `training.device.ddp_port` | DDP port. | `int` | `20027` |
| `training.device.use_amp` | Whether to enable automatic mix-precision. | `bool` | `True` |
| `training.device.nb_gpu` | Number of GPUs to train DAN. Set to `null` to use all GPUs available. | `int` | |
| `training.device.force` | Use a specific device if available. Use `cpu` to train on CPU (for debugging) or `cuda`/`cuda:$gpu_device` to train on GPU. | `str` | |
- To train on several GPUs, simply set the `training.device.use_ddp` parameter to `True`. By default, the model will use all available GPUs. To restrict access to fewer GPUs, one can modify the `training.device.nb_gpu` parameter.
### Optimizers
| Name | Description | Type | Default |
| -------------------------------------- | ------------------------------------ | ------- | -------- |
| `training.optimizers.all.args.lr` | Learning rate for the optimizer. | `float` | `0.0001` |
| `training.optimizers.all.args.amsgrad` | Whether to use AMSGrad optimization. | `bool` | `False` |
### Validation
| Name | Description | Type | Default |
| -------------------------------------------- | -------------------------------------------------------------------------- | ------ | ------- |
| `training.validation.eval_on_valid` | Whether to evaluate and log metrics on the validation set during training. | `bool` | `True` |
| `training.validation.eval_on_valid_interval` | Interval (in epochs) to evaluate during training. | `int` | `5` |
| `training.validation.set_name_focus_metric` | Dataset to focus on to select best weights. | `str` | |
- During the validation stage, the batch size is set to 1. This avoids problems associated with image sizes that can be very different inside batches and lead to significant padding, resulting in performance degradations.
### Metrics
| Name | Description | Type | Default |
| ------------------------ | --------------------------------------------- | ------ | --------------------------------------------------------------------------- |
| `training.metrics.train` | List of metrics to compute during training. | `list` | `["loss_ce", "cer", "cer_no_token", "wer", "wer_no_punct", "wer_no_token"]` |
| `training.metrics.eval` | List of metrics to compute during validation. | `list` | `["cer", "cer_no_token", "wer", "wer_no_punct", "wer_no_token"]` |
### Label noise scheduler
| Name | Description | Type | Default |
| ------------------------------------------------ | ------------------------------------------------ | ------- | ------- |
| `training.label_noise_scheduler.min_error_rate` | Minimum ratio of teacher forcing. | `float` | `0.2` |
| `training.label_noise_scheduler.max_error_rate` | Maximum ratio of teacher forcing. | `float` | `0.2` |
| `training.label_noise_scheduler.total_num_steps` | Number of steps before stopping teacher forcing. | `float` | `5e4` |
### Transfer learning
| Name | Description | Type | Default |
| ------------------------------------ | -------------------------------------------------------------------------------------- | ------ | ----------------------------------------------------------------- |
| `training.transfer_learning.encoder` | Model to load for the encoder \[state_dict_name, checkpoint_path, learnable, strict\]. | `list` | `["encoder", "pretrained_models/dan_rimes_page.pt", True, True]` |
| `training.transfer_learning.decoder` | Model to load for the decoder \[state_dict_name, checkpoint_path, learnable, strict\]. | `list` | `["decoder", "pretrained_models/dan_rimes_page.pt", True, False]` |
### Data preprocessing
Preprocessing is applied before training the network (see the [dedicated references](../../ref/ocr/managers/dataset.md)). The list of accepted transforms is defined in the [dedicated references](../../ref/ocr/transforms.md#dan.ocr.transforms.Preprocessing).