# Copyright (c) 2020, NVIDIA CORPORATION. All rights reserved. # # Licensed under the Apache License, Version 2.0 (the "License"); # you may not use this file except in compliance with the License. # You may obtain a copy of the License at # # http://www.apache.org/licenses/LICENSE-2.0 # # Unless required by applicable law or agreed to in writing, software # distributed under the License is distributed on an "AS IS" BASIS, # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. # See the License for the specific language governing permissions and # limitations under the License. import copy import os from math import ceil from typing import Any, Dict, List, Optional, Union import numpy as np import torch from lightning.pytorch import Trainer from omegaconf import DictConfig, OmegaConf, open_dict from torch.utils.data import DataLoader from nemo.collections.asr.data import audio_to_text_dataset from nemo.collections.asr.data.audio_to_text import _AudioTextDataset from nemo.collections.asr.data.audio_to_text_dali import AudioToCharDALIDataset, DALIOutputs from nemo.collections.asr.data.audio_to_text_lhotse import LhotseSpeechToTextBpeDataset from nemo.collections.asr.losses.ctc import CTCLoss from nemo.collections.asr.metrics.wer import WER from nemo.collections.asr.models.asr_model import ASRModel, ExportableEncDecModel from nemo.collections.asr.parts.mixins import ASRModuleMixin, ASRTranscriptionMixin, InterCTCMixin, TranscribeConfig from nemo.collections.asr.parts.mixins.transcription import GenericTranscriptionType, TranscriptionReturnType from nemo.collections.asr.parts.preprocessing.segment import ChannelSelectorType from nemo.collections.asr.parts.submodules.ctc_decoding import CTCDecoding, CTCDecodingConfig from nemo.collections.asr.parts.utils.asr_batching import get_semi_sorted_batch_sampler from nemo.collections.asr.parts.utils.rnnt_utils import Hypothesis from nemo.collections.asr.parts.utils.timestamp_utils import process_timestamp_outputs from nemo.collections.common.data.lhotse import get_lhotse_dataloader_from_config from nemo.collections.common.parts.preprocessing.parsers import make_parser from nemo.core.classes.common import PretrainedModelInfo, typecheck from nemo.core.classes.mixins import AccessMixin from nemo.core.neural_types import AudioSignal, LabelsType, LengthsType, LogprobsType, NeuralType, SpectrogramType from nemo.utils import logging __all__ = ['EncDecCTCModel'] class EncDecCTCModel(ASRModel, ExportableEncDecModel, ASRModuleMixin, InterCTCMixin, ASRTranscriptionMixin): """Base class for encoder decoder CTC-based models.""" def __init__(self, cfg: DictConfig, trainer: Trainer = None): # Get global rank and total number of GPU workers for IterableDataset partitioning, if applicable # Global_rank and local_rank is set by LightningModule in Lightning 1.2.0 self.world_size = 1 if trainer is not None: self.world_size = trainer.world_size super().__init__(cfg=cfg, trainer=trainer) self.preprocessor = EncDecCTCModel.from_config_dict(self._cfg.preprocessor) self.encoder = EncDecCTCModel.from_config_dict(self._cfg.encoder) with open_dict(self._cfg): if "feat_in" not in self._cfg.decoder or ( not self._cfg.decoder.feat_in and hasattr(self.encoder, '_feat_out') ): self._cfg.decoder.feat_in = self.encoder._feat_out if "feat_in" not in self._cfg.decoder or not self._cfg.decoder.feat_in: raise ValueError("param feat_in of the decoder's config is not set!") if self.cfg.decoder.num_classes < 1 and self.cfg.decoder.vocabulary is not None: logging.info( "\nReplacing placeholder number of classes ({}) with actual number of classes - {}".format( self.cfg.decoder.num_classes, len(self.cfg.decoder.vocabulary) ) ) cfg.decoder["num_classes"] = len(self.cfg.decoder.vocabulary) self.decoder = EncDecCTCModel.from_config_dict(self._cfg.decoder) self.loss = CTCLoss( num_classes=self.decoder.num_classes_with_blank - 1, zero_infinity=True, reduction=self._cfg.get("ctc_reduction", "mean_batch"), ) if hasattr(self._cfg, 'spec_augment') and self._cfg.spec_augment is not None: self.spec_augmentation = EncDecCTCModel.from_config_dict(self._cfg.spec_augment) else: self.spec_augmentation = None # Setup decoding objects decoding_cfg = self.cfg.get('decoding', None) # In case decoding config not found, use default config if decoding_cfg is None: decoding_cfg = OmegaConf.structured(CTCDecodingConfig) with open_dict(self.cfg): self.cfg.decoding = decoding_cfg self.decoding = CTCDecoding(self.cfg.decoding, vocabulary=OmegaConf.to_container(self.decoder.vocabulary)) # Setup metric with decoding strategy self.wer = WER( decoding=self.decoding, use_cer=self._cfg.get('use_cer', False), dist_sync_on_step=True, log_prediction=self._cfg.get("log_prediction", False), ) # Setup optional Optimization flags self.setup_optimization_flags() # setting up interCTC loss (from InterCTCMixin) self.setup_interctc(decoder_name='decoder', loss_name='loss', wer_name='wer') # Adapter modules setup (from ASRAdapterModelMixin) self.setup_adapters() def transcribe( self, audio: Union[str, List[str], torch.Tensor, np.ndarray, DataLoader], batch_size: int = 4, return_hypotheses: bool = False, num_workers: int = 0, channel_selector: Optional[ChannelSelectorType] = None, augmentor: DictConfig = None, verbose: bool = True, timestamps: Optional[bool] = None, override_config: Optional[TranscribeConfig] = None, ) -> TranscriptionReturnType: """ Uses greedy decoding to transcribe audio files. Use this method for debugging and prototyping. Args: audio: (a single or list) of paths to audio files or a np.ndarray/tensor audio array or path to a manifest file. Can also be a dataloader object that provides values that can be consumed by the model. Recommended length per file is between 5 and 25 seconds. \ But it is possible to pass a few hours long file if enough GPU memory is available. batch_size: (int) batch size to use during inference. Bigger will result in better throughput performance but would use more memory. return_hypotheses: (bool) Either return hypotheses or text With hypotheses can do some postprocessing like getting timestamp or rescoring num_workers: (int) number of workers for DataLoader channel_selector (int | Iterable[int] | str): select a single channel or a subset of channels from multi-channel audio. If set to `'average'`, it performs averaging across channels. Disabled if set to `None`. Defaults to `None`. augmentor: (DictConfig): Augment audio samples during transcription if augmentor is applied. timestamps: Optional(Bool): timestamps will be returned if set to True as part of hypothesis object (output.timestep['segment']/output.timestep['word']). Refer to `Hypothesis` class for more details. Default is None and would retain the previous state set by using self.change_decoding_strategy(). verbose: (bool) whether to display tqdm progress bar override_config: (Optional[TranscribeConfig]) override transcription config pre-defined by the user. **Note**: All other arguments in the function will be ignored if override_config is passed. You should call this argument as `model.transcribe(audio, override_config=TranscribeConfig(...))`. Returns: A list of transcriptions (or raw log probabilities if logprobs is True) in the same order as paths2audio_files """ timestamps = timestamps or (override_config.timestamps if override_config is not None else None) if timestamps is not None: # else retain the decoder state (users can set it using change_decoding_strategy) if timestamps or (override_config is not None and override_config.timestamps): logging.info( "Timestamps requested, setting decoding timestamps to True. Capture them in Hypothesis object, \ with output[idx].timestep['word'/'segment'/'char']" ) return_hypotheses = True with open_dict(self.cfg.decoding): self.cfg.decoding.compute_timestamps = True self.change_decoding_strategy(self.cfg.decoding, verbose=False) else: # This is done to ensure the state is preserved when decoding_strategy is set outside with open_dict(self.cfg.decoding): self.cfg.decoding.compute_timestamps = self.cfg.decoding.get('compute_timestamps', False) self.cfg.decoding.preserve_alignments = self.cfg.decoding.get('preserve_alignments', False) self.change_decoding_strategy(self.cfg.decoding, verbose=False) return super().transcribe( audio=audio, batch_size=batch_size, return_hypotheses=return_hypotheses, num_workers=num_workers, channel_selector=channel_selector, augmentor=augmentor, verbose=verbose, timestamps=timestamps, override_config=override_config, ) def change_vocabulary(self, new_vocabulary: List[str], decoding_cfg: Optional[DictConfig] = None): """ Changes vocabulary used during CTC decoding process. Use this method when fine-tuning on from pre-trained model. This method changes only decoder and leaves encoder and pre-processing modules unchanged. For example, you would use it if you want to use pretrained encoder when fine-tuning on a data in another language, or when you'd need model to learn capitalization, punctuation and/or special characters. If new_vocabulary == self.decoder.vocabulary then nothing will be changed. Args: new_vocabulary: list with new vocabulary. Must contain at least 2 elements. Typically, \ this is target alphabet. Returns: None """ if self.decoder.vocabulary == new_vocabulary: logging.warning(f"Old {self.decoder.vocabulary} and new {new_vocabulary} match. Not changing anything.") else: if new_vocabulary is None or len(new_vocabulary) == 0: raise ValueError(f'New vocabulary must be non-empty list of chars. But I got: {new_vocabulary}') decoder_config = self.decoder.to_config_dict() new_decoder_config = copy.deepcopy(decoder_config) new_decoder_config['vocabulary'] = new_vocabulary new_decoder_config['num_classes'] = len(new_vocabulary) del self.decoder self.decoder = EncDecCTCModel.from_config_dict(new_decoder_config) del self.loss self.loss = CTCLoss( num_classes=self.decoder.num_classes_with_blank - 1, zero_infinity=True, reduction=self._cfg.get("ctc_reduction", "mean_batch"), ) if decoding_cfg is None: # Assume same decoding config as before decoding_cfg = self.cfg.decoding # Assert the decoding config with all hyper parameters decoding_cls = OmegaConf.structured(CTCDecodingConfig) decoding_cls = OmegaConf.create(OmegaConf.to_container(decoding_cls)) decoding_cfg = OmegaConf.merge(decoding_cls, decoding_cfg) self.decoding = CTCDecoding( decoding_cfg=decoding_cfg, vocabulary=OmegaConf.to_container(self.decoder.vocabulary) ) self.wer = WER( decoding=self.decoding, use_cer=self._cfg.get('use_cer', False), dist_sync_on_step=True, log_prediction=self._cfg.get("log_prediction", False), ) # Update config with open_dict(self.cfg.decoder): self._cfg.decoder = new_decoder_config with open_dict(self.cfg.decoding): self.cfg.decoding = decoding_cfg ds_keys = ['train_ds', 'validation_ds', 'test_ds'] for key in ds_keys: if key in self.cfg: with open_dict(self.cfg[key]): self.cfg[key]['labels'] = OmegaConf.create(new_vocabulary) logging.info(f"Changed decoder to output to {self.decoder.vocabulary} vocabulary.") def change_decoding_strategy(self, decoding_cfg: DictConfig, verbose: bool = True): """ Changes decoding strategy used during CTC decoding process. Args: decoding_cfg: A config for the decoder, which is optional. If the decoding type needs to be changed (from say Greedy to Beam decoding etc), the config can be passed here. verbose: (bool) whether to display logging information """ if decoding_cfg is None: # Assume same decoding config as before logging.info("No `decoding_cfg` passed when changing decoding strategy, using internal config") decoding_cfg = self.cfg.decoding # Assert the decoding config with all hyper parameters decoding_cls = OmegaConf.structured(CTCDecodingConfig) decoding_cls = OmegaConf.create(OmegaConf.to_container(decoding_cls)) decoding_cfg = OmegaConf.merge(decoding_cls, decoding_cfg) self.decoding = CTCDecoding( decoding_cfg=decoding_cfg, vocabulary=OmegaConf.to_container(self.decoder.vocabulary) ) self.wer = WER( decoding=self.decoding, use_cer=self.wer.use_cer, log_prediction=self.wer.log_prediction, dist_sync_on_step=True, ) self.decoder.temperature = decoding_cfg.get('temperature', 1.0) # Update config with open_dict(self.cfg.decoding): self.cfg.decoding = decoding_cfg if verbose: logging.info(f"Changed decoding strategy to \n{OmegaConf.to_yaml(self.cfg.decoding)}") def _setup_dataloader_from_config(self, config: Optional[Dict]): # Automatically inject args from model config to dataloader config audio_to_text_dataset.inject_dataloader_value_from_model_config(self.cfg, config, key='sample_rate') audio_to_text_dataset.inject_dataloader_value_from_model_config(self.cfg, config, key='labels') if config.get("use_lhotse"): return get_lhotse_dataloader_from_config( config, # During transcription, the model is initially loaded on the CPU. # To ensure the correct global_rank and world_size are set, # these values must be passed from the configuration. global_rank=self.global_rank if not config.get("do_transcribe", False) else config.get("global_rank"), world_size=self.world_size if not config.get("do_transcribe", False) else config.get("world_size"), dataset=LhotseSpeechToTextBpeDataset( tokenizer=make_parser( labels=config.get('labels', None), name=config.get('parser', 'en'), unk_id=config.get('unk_index', -1), blank_id=config.get('blank_index', -1), do_normalize=config.get('normalize_transcripts', False), ), return_cuts=config.get("do_transcribe", False), ), ) dataset = audio_to_text_dataset.get_audio_to_text_char_dataset_from_config( config=config, local_rank=self.local_rank, global_rank=self.global_rank, world_size=self.world_size, preprocessor_cfg=self._cfg.get("preprocessor", None), ) if dataset is None: return None if isinstance(dataset, AudioToCharDALIDataset): # DALI Dataset implements dataloader interface return dataset shuffle = config['shuffle'] if isinstance(dataset, torch.utils.data.IterableDataset): shuffle = False if hasattr(dataset, 'collate_fn'): collate_fn = dataset.collate_fn elif hasattr(dataset.datasets[0], 'collate_fn'): # support datasets that are lists of entries collate_fn = dataset.datasets[0].collate_fn else: # support datasets that are lists of lists collate_fn = dataset.datasets[0].datasets[0].collate_fn batch_sampler = None if config.get('use_semi_sorted_batching', False): if not isinstance(dataset, _AudioTextDataset): raise RuntimeError( "Semi Sorted Batch sampler can be used with AudioToCharDataset or AudioToBPEDataset " f"but found dataset of type {type(dataset)}" ) # set batch_size and batch_sampler to None to disable automatic batching batch_sampler = get_semi_sorted_batch_sampler(self, dataset, config) config['batch_size'] = None config['drop_last'] = False shuffle = False return torch.utils.data.DataLoader( dataset=dataset, batch_size=config['batch_size'], sampler=batch_sampler, batch_sampler=None, collate_fn=collate_fn, drop_last=config.get('drop_last', False), shuffle=shuffle, num_workers=config.get('num_workers', 0), pin_memory=config.get('pin_memory', False), ) def setup_training_data(self, train_data_config: Optional[Union[DictConfig, Dict]]): """ Sets up the training data loader via a Dict-like object. Args: train_data_config: A config that contains the information regarding construction of an ASR Training dataset. Supported Datasets: - :class:`~nemo.collections.asr.data.audio_to_text.AudioToCharDataset` - :class:`~nemo.collections.asr.data.audio_to_text.AudioToBPEDataset` - :class:`~nemo.collections.asr.data.audio_to_text.TarredAudioToCharDataset` - :class:`~nemo.collections.asr.data.audio_to_text.TarredAudioToBPEDataset` - :class:`~nemo.collections.asr.data.audio_to_text_dali.AudioToCharDALIDataset` """ if 'shuffle' not in train_data_config: train_data_config['shuffle'] = True # preserve config self._update_dataset_config(dataset_name='train', config=train_data_config) self._train_dl = self._setup_dataloader_from_config(config=train_data_config) # Need to set this because if using an IterableDataset, the length of the dataloader is the total number # of samples rather than the number of batches, and this messes up the tqdm progress bar. # So we set the number of steps manually (to the correct number) to fix this. if ( self._train_dl is not None and hasattr(self._train_dl, 'dataset') and isinstance(self._train_dl.dataset, torch.utils.data.IterableDataset) ): # We also need to check if limit_train_batches is already set. # If it's an int, we assume that the user has set it to something sane, i.e. <= # training batches, # and don't change it. Otherwise, adjust batches accordingly if it's a float (including 1.0). if self._trainer is not None and isinstance(self._trainer.limit_train_batches, float): self._trainer.limit_train_batches = int( self._trainer.limit_train_batches * ceil((len(self._train_dl.dataset) / self.world_size) / train_data_config['batch_size']) ) elif self._trainer is None: logging.warning( "Model Trainer was not set before constructing the dataset, incorrect number of " "training batches will be used. Please set the trainer and rebuild the dataset." ) def setup_validation_data(self, val_data_config: Optional[Union[DictConfig, Dict]]): """ Sets up the validation data loader via a Dict-like object. Args: val_data_config: A config that contains the information regarding construction of an ASR Training dataset. Supported Datasets: - :class:`~nemo.collections.asr.data.audio_to_text.AudioToCharDataset` - :class:`~nemo.collections.asr.data.audio_to_text.AudioToBPEDataset` - :class:`~nemo.collections.asr.data.audio_to_text.TarredAudioToCharDataset` - :class:`~nemo.collections.asr.data.audio_to_text.TarredAudioToBPEDataset` - :class:`~nemo.collections.asr.data.audio_to_text_dali.AudioToCharDALIDataset` """ if 'shuffle' not in val_data_config: val_data_config['shuffle'] = False # preserve config self._update_dataset_config(dataset_name='validation', config=val_data_config) self._validation_dl = self._setup_dataloader_from_config(config=val_data_config) def setup_test_data(self, test_data_config: Optional[Union[DictConfig, Dict]]): """ Sets up the test data loader via a Dict-like object. Args: test_data_config: A config that contains the information regarding construction of an ASR Training dataset. Supported Datasets: - :class:`~nemo.collections.asr.data.audio_to_text.AudioToCharDataset` - :class:`~nemo.collections.asr.data.audio_to_text.AudioToBPEDataset` - :class:`~nemo.collections.asr.data.audio_to_text.TarredAudioToCharDataset` - :class:`~nemo.collections.asr.data.audio_to_text.TarredAudioToBPEDataset` - :class:`~nemo.collections.asr.data.audio_to_text_dali.AudioToCharDALIDataset` """ if 'shuffle' not in test_data_config: test_data_config['shuffle'] = False # preserve config self._update_dataset_config(dataset_name='test', config=test_data_config) self._test_dl = self._setup_dataloader_from_config(config=test_data_config) @property def input_types(self) -> Optional[Dict[str, NeuralType]]: if hasattr(self.preprocessor, '_sample_rate'): input_signal_eltype = AudioSignal(freq=self.preprocessor._sample_rate) else: input_signal_eltype = AudioSignal() return { "input_signal": NeuralType(('B', 'T'), input_signal_eltype, optional=True), "input_signal_length": NeuralType(tuple('B'), LengthsType(), optional=True), "processed_signal": NeuralType(('B', 'D', 'T'), SpectrogramType(), optional=True), "processed_signal_length": NeuralType(tuple('B'), LengthsType(), optional=True), "sample_id": NeuralType(tuple('B'), LengthsType(), optional=True), } @property def output_types(self) -> Optional[Dict[str, NeuralType]]: return { "outputs": NeuralType(('B', 'T', 'D'), LogprobsType()), "encoded_lengths": NeuralType(tuple('B'), LengthsType()), "greedy_predictions": NeuralType(('B', 'T'), LabelsType()), } @typecheck() def forward( self, input_signal=None, input_signal_length=None, processed_signal=None, processed_signal_length=None ): """ Forward pass of the model. Args: input_signal: Tensor that represents a batch of raw audio signals, of shape [B, T]. T here represents timesteps, with 1 second of audio represented as `self.sample_rate` number of floating point values. input_signal_length: Vector of length B, that contains the individual lengths of the audio sequences. processed_signal: Tensor that represents a batch of processed audio signals, of shape (B, D, T) that has undergone processing via some DALI preprocessor. processed_signal_length: Vector of length B, that contains the individual lengths of the processed audio sequences. Returns: A tuple of 3 elements - 1) The log probabilities tensor of shape [B, T, D]. 2) The lengths of the acoustic sequence after propagation through the encoder, of shape [B]. 3) The greedy token predictions of the model of shape [B, T] (via argmax) """ has_input_signal = input_signal is not None and input_signal_length is not None has_processed_signal = processed_signal is not None and processed_signal_length is not None if (has_input_signal ^ has_processed_signal) == False: raise ValueError( f"{self} Arguments ``input_signal`` and ``input_signal_length`` are mutually exclusive " " with ``processed_signal`` and ``processed_signal_len`` arguments." ) if not has_processed_signal: processed_signal, processed_signal_length = self.preprocessor( input_signal=input_signal, length=input_signal_length, ) if self.spec_augmentation is not None and self.training: processed_signal = self.spec_augmentation(input_spec=processed_signal, length=processed_signal_length) encoder_output = self.encoder(audio_signal=processed_signal, length=processed_signal_length) encoded = encoder_output[0] encoded_len = encoder_output[1] log_probs = self.decoder(encoder_output=encoded) greedy_predictions = log_probs.argmax(dim=-1, keepdim=False) return ( log_probs, encoded_len, greedy_predictions, ) # PTL-specific methods def training_step(self, batch, batch_nb): # Reset access registry if AccessMixin.is_access_enabled(self.model_guid): AccessMixin.reset_registry(self) if self.is_interctc_enabled(): AccessMixin.set_access_enabled(access_enabled=True, guid=self.model_guid) signal, signal_len, transcript, transcript_len = batch if isinstance(batch, DALIOutputs) and batch.has_processed_signal: log_probs, encoded_len, predictions = self.forward( processed_signal=signal, processed_signal_length=signal_len ) else: log_probs, encoded_len, predictions = self.forward(input_signal=signal, input_signal_length=signal_len) if hasattr(self, '_trainer') and self._trainer is not None: log_every_n_steps = self._trainer.log_every_n_steps else: log_every_n_steps = 1 loss_value = self.loss( log_probs=log_probs, targets=transcript, input_lengths=encoded_len, target_lengths=transcript_len ) # Add auxiliary losses, if registered loss_value = self.add_auxiliary_losses(loss_value) # only computing WER when requested in the logs (same as done for final-layer WER below) loss_value, tensorboard_logs = self.add_interctc_losses( loss_value, transcript, transcript_len, compute_wer=((batch_nb + 1) % log_every_n_steps == 0) ) # Reset access registry if AccessMixin.is_access_enabled(self.model_guid): AccessMixin.reset_registry(self) tensorboard_logs.update( { 'train_loss': loss_value, 'learning_rate': self._optimizer.param_groups[0]['lr'], 'global_step': torch.tensor(self.trainer.global_step, dtype=torch.float32), } ) if (batch_nb + 1) % log_every_n_steps == 0: self.wer.update( predictions=log_probs, targets=transcript, targets_lengths=transcript_len, predictions_lengths=encoded_len, ) wer, _, _ = self.wer.compute() self.wer.reset() tensorboard_logs.update({'training_batch_wer': wer}) return {'loss': loss_value, 'log': tensorboard_logs} def predict_step(self, batch, batch_idx, dataloader_idx=0): signal, signal_len, transcript, transcript_len, sample_id = batch if isinstance(batch, DALIOutputs) and batch.has_processed_signal: log_probs, encoded_len, predictions = self.forward( processed_signal=signal, processed_signal_length=signal_len ) else: log_probs, encoded_len, predictions = self.forward(input_signal=signal, input_signal_length=signal_len) transcribed_texts = self.wer.decoding.ctc_decoder_predictions_tensor( decoder_outputs=log_probs, decoder_lengths=encoded_len, return_hypotheses=False, ) if isinstance(sample_id, torch.Tensor): sample_id = sample_id.cpu().detach().numpy() return list(zip(sample_id, transcribed_texts)) def validation_pass(self, batch, batch_idx, dataloader_idx=0): if self.is_interctc_enabled(): AccessMixin.set_access_enabled(access_enabled=True, guid=self.model_guid) signal, signal_len, transcript, transcript_len = batch if isinstance(batch, DALIOutputs) and batch.has_processed_signal: log_probs, encoded_len, predictions = self.forward( processed_signal=signal, processed_signal_length=signal_len ) else: log_probs, encoded_len, predictions = self.forward(input_signal=signal, input_signal_length=signal_len) loss_value = self.loss( log_probs=log_probs, targets=transcript, input_lengths=encoded_len, target_lengths=transcript_len ) loss_value, metrics = self.add_interctc_losses( loss_value, transcript, transcript_len, compute_wer=True, log_wer_num_denom=True, log_prefix="val_", ) self.wer.update( predictions=log_probs, targets=transcript, targets_lengths=transcript_len, predictions_lengths=encoded_len, ) wer, wer_num, wer_denom = self.wer.compute() self.wer.reset() metrics.update({'val_loss': loss_value, 'val_wer_num': wer_num, 'val_wer_denom': wer_denom, 'val_wer': wer}) self.log('global_step', torch.tensor(self.trainer.global_step, dtype=torch.float32)) # Reset access registry if AccessMixin.is_access_enabled(self.model_guid): AccessMixin.reset_registry(self) return metrics def validation_step(self, batch, batch_idx, dataloader_idx=0): metrics = self.validation_pass(batch, batch_idx, dataloader_idx) if type(self.trainer.val_dataloaders) == list and len(self.trainer.val_dataloaders) > 1: self.validation_step_outputs[dataloader_idx].append(metrics) else: self.validation_step_outputs.append(metrics) return metrics def multi_validation_epoch_end(self, outputs, dataloader_idx: int = 0): metrics = super().multi_validation_epoch_end(outputs, dataloader_idx) self.finalize_interctc_metrics(metrics, outputs, prefix="val_") return metrics def multi_test_epoch_end(self, outputs, dataloader_idx: int = 0): metrics = super().multi_test_epoch_end(outputs, dataloader_idx) self.finalize_interctc_metrics(metrics, outputs, prefix="test_") return metrics def test_step(self, batch, batch_idx, dataloader_idx=0): logs = self.validation_pass(batch, batch_idx, dataloader_idx=dataloader_idx) test_logs = {name.replace("val_", "test_"): value for name, value in logs.items()} if type(self.trainer.test_dataloaders) == list and len(self.trainer.test_dataloaders) > 1: self.test_step_outputs[dataloader_idx].append(test_logs) else: self.test_step_outputs.append(test_logs) return test_logs def test_dataloader(self): if self._test_dl is not None: return self._test_dl """ Transcription related methods """ def _transcribe_forward(self, batch: Any, trcfg: TranscribeConfig): logits, logits_len, greedy_predictions = self.forward(input_signal=batch[0], input_signal_length=batch[1]) output = dict(logits=logits, logits_len=logits_len) del greedy_predictions return output def _transcribe_output_processing(self, outputs, trcfg: TranscribeConfig) -> GenericTranscriptionType: logits = outputs.pop('logits') logits_len = outputs.pop('logits_len') hypotheses = self.decoding.ctc_decoder_predictions_tensor( logits, decoder_lengths=logits_len, return_hypotheses=trcfg.return_hypotheses, ) if trcfg.return_hypotheses: if logits.is_cuda: # See comment in # ctc_greedy_decoding.py::GreedyCTCInfer::forward() to # understand this idiom. logits_cpu = torch.empty(logits.shape, dtype=logits.dtype, device=torch.device("cpu"), pin_memory=True) logits_cpu.copy_(logits, non_blocking=True) else: logits_cpu = logits logits_len = logits_len.cpu() # dump log probs per file for idx in range(logits_cpu.shape[0]): # We clone because we don't want references to the # cudaMallocHost()-allocated tensor to be floating # around. Were that to be the case, then the pinned # memory cache would always miss. hypotheses[idx].y_sequence = logits_cpu[idx, : logits_len[idx]].clone() if hypotheses[idx].alignments is None: hypotheses[idx].alignments = hypotheses[idx].y_sequence del logits_cpu # cleanup memory del logits, logits_len if trcfg.timestamps: hypotheses = process_timestamp_outputs( hypotheses, self.encoder.subsampling_factor, self.cfg['preprocessor']['window_stride'] ) return hypotheses def get_best_hyptheses(self, all_hypothesis: list[list[Hypothesis]]): return [hyp[0] for hyp in all_hypothesis] def _setup_transcribe_dataloader(self, config: Dict) -> 'torch.utils.data.DataLoader': """ Setup function for a temporary data loader which wraps the provided audio file. Args: config: A python dictionary which contains the following keys: paths2audio_files: (a list) of paths to audio files. The files should be relatively short fragments. \ Recommended length per file is between 5 and 25 seconds. batch_size: (int) batch size to use during inference. \ Bigger will result in better throughput performance but would use more memory. temp_dir: (str) A temporary directory where the audio manifest is temporarily stored. num_workers: (int) number of workers. Depends of the batch_size and machine. \ 0 - only the main process will load batches, 1 - one worker (not main process) Returns: A pytorch DataLoader for the given audio file(s). """ if 'manifest_filepath' in config: manifest_filepath = config['manifest_filepath'] batch_size = config['batch_size'] else: manifest_filepath = os.path.join(config['temp_dir'], 'manifest.json') batch_size = min(config['batch_size'], len(config['paths2audio_files'])) dl_config = { 'manifest_filepath': manifest_filepath, 'sample_rate': self.preprocessor._sample_rate, 'labels': OmegaConf.to_container(self.decoder.vocabulary), 'batch_size': batch_size, 'trim_silence': False, 'shuffle': False, 'num_workers': config.get('num_workers', min(batch_size, os.cpu_count() - 1)), 'pin_memory': True, 'channel_selector': config.get('channel_selector', None), } if config.get("augmentor"): dl_config['augmentor'] = config.get("augmentor") temporary_datalayer = self._setup_dataloader_from_config(config=DictConfig(dl_config)) return temporary_datalayer @classmethod def list_available_models(cls) -> List[PretrainedModelInfo]: """ This method returns a list of pre-trained model which can be instantiated directly from NVIDIA's NGC cloud. Returns: List of available pre-trained models. """ results = [] model = PretrainedModelInfo( pretrained_model_name="QuartzNet15x5Base-En", description="QuartzNet15x5 model trained on six datasets: LibriSpeech, Mozilla Common Voice \ (validated clips from en_1488h_2019-12-10), WSJ, Fisher, Switchboard, and NSC Singapore English. \ It was trained with Apex/Amp optimization level O1 for 600 epochs. The model achieves a WER of \ 3.79% on LibriSpeech dev-clean, and a WER of 10.05% on dev-other. Please visit \ https://ngc.nvidia.com/catalog/models/nvidia:nemospeechmodels for further details.", location="https://api.ngc.nvidia.com/v2/models/nvidia/nemospeechmodels/versions/1.0.0a5/files/QuartzNet15x5Base-En.nemo", ) results.append(model) model = PretrainedModelInfo( pretrained_model_name="stt_en_quartznet15x5", description="For details about this model, please visit https://ngc.nvidia.com/catalog/models/nvidia:nemo:stt_en_quartznet15x5", location="https://api.ngc.nvidia.com/v2/models/nvidia/nemo/stt_en_quartznet15x5/versions/1.0.0rc1/files/stt_en_quartznet15x5.nemo", ) results.append(model) model = PretrainedModelInfo( pretrained_model_name="stt_en_jasper10x5dr", description="For details about this model, please visit https://ngc.nvidia.com/catalog/models/nvidia:nemo:stt_en_jasper10x5dr", location="https://api.ngc.nvidia.com/v2/models/nvidia/nemo/stt_en_jasper10x5dr/versions/1.0.0rc1/files/stt_en_jasper10x5dr.nemo", ) results.append(model) model = PretrainedModelInfo( pretrained_model_name="stt_ca_quartznet15x5", description="For details about this model, please visit https://ngc.nvidia.com/catalog/models/nvidia:nemo:stt_ca_quartznet15x5", location="https://api.ngc.nvidia.com/v2/models/nvidia/nemo/stt_ca_quartznet15x5/versions/1.0.0rc1/files/stt_ca_quartznet15x5.nemo", ) results.append(model) model = PretrainedModelInfo( pretrained_model_name="stt_it_quartznet15x5", description="For details about this model, please visit https://ngc.nvidia.com/catalog/models/nvidia:nemo:stt_it_quartznet15x5", location="https://api.ngc.nvidia.com/v2/models/nvidia/nemo/stt_it_quartznet15x5/versions/1.0.0rc1/files/stt_it_quartznet15x5.nemo", ) results.append(model) model = PretrainedModelInfo( pretrained_model_name="stt_fr_quartznet15x5", description="For details about this model, please visit https://ngc.nvidia.com/catalog/models/nvidia:nemo:stt_fr_quartznet15x5", location="https://api.ngc.nvidia.com/v2/models/nvidia/nemo/stt_fr_quartznet15x5/versions/1.0.0rc1/files/stt_fr_quartznet15x5.nemo", ) results.append(model) model = PretrainedModelInfo( pretrained_model_name="stt_es_quartznet15x5", description="For details about this model, please visit https://ngc.nvidia.com/catalog/models/nvidia:nemo:stt_es_quartznet15x5", location="https://api.ngc.nvidia.com/v2/models/nvidia/nemo/stt_es_quartznet15x5/versions/1.0.0rc1/files/stt_es_quartznet15x5.nemo", ) results.append(model) model = PretrainedModelInfo( pretrained_model_name="stt_de_quartznet15x5", description="For details about this model, please visit https://ngc.nvidia.com/catalog/models/nvidia:nemo:stt_de_quartznet15x5", location="https://api.ngc.nvidia.com/v2/models/nvidia/nemo/stt_de_quartznet15x5/versions/1.0.0rc1/files/stt_de_quartznet15x5.nemo", ) results.append(model) model = PretrainedModelInfo( pretrained_model_name="stt_pl_quartznet15x5", description="For details about this model, please visit https://ngc.nvidia.com/catalog/models/nvidia:nemo:stt_pl_quartznet15x5", location="https://api.ngc.nvidia.com/v2/models/nvidia/nemo/stt_pl_quartznet15x5/versions/1.0.0rc1/files/stt_pl_quartznet15x5.nemo", ) results.append(model) model = PretrainedModelInfo( pretrained_model_name="stt_ru_quartznet15x5", description="For details about this model, please visit https://ngc.nvidia.com/catalog/models/nvidia:nemo:stt_ru_quartznet15x5", location="https://api.ngc.nvidia.com/v2/models/nvidia/nemo/stt_ru_quartznet15x5/versions/1.0.0rc1/files/stt_ru_quartznet15x5.nemo", ) results.append(model) model = PretrainedModelInfo( pretrained_model_name="stt_zh_citrinet_512", description="For details about this model, please visit https://ngc.nvidia.com/catalog/models/nvidia:nemo:stt_zh_citrinet_512", location="https://api.ngc.nvidia.com/v2/models/nvidia/nemo/stt_zh_citrinet_512/versions/1.0.0rc1/files/stt_zh_citrinet_512.nemo", ) results.append(model) model = PretrainedModelInfo( pretrained_model_name="stt_zh_citrinet_1024_gamma_0_25", description="For details about this model, please visit https://ngc.nvidia.com/catalog/models/nvidia:nemo:stt_zh_citrinet_1024_gamma_0_25", location="https://api.ngc.nvidia.com/v2/models/nvidia/nemo/stt_zh_citrinet_1024_gamma_0_25/versions/1.0.0/files/stt_zh_citrinet_1024_gamma_0_25.nemo", ) results.append(model) model = PretrainedModelInfo( pretrained_model_name="stt_zh_citrinet_1024_gamma_0_25", description="For details about this model, please visit https://ngc.nvidia.com/catalog/models/nvidia:nemo:stt_zh_citrinet_1024_gamma_0_25", location="https://api.ngc.nvidia.com/v2/models/nvidia/nemo/stt_zh_citrinet_1024_gamma_0_25/versions/1.0.0/files/stt_zh_citrinet_1024_gamma_0_25.nemo", ) results.append(model) model = PretrainedModelInfo( pretrained_model_name="asr_talknet_aligner", description="For details about this model, please visit https://ngc.nvidia.com/catalog/models/nvidia:nemo:asr_talknet_aligner", location="https://api.ngc.nvidia.com/v2/models/nvidia/nemo/asr_talknet_aligner/versions/1.0.0rc1/files/qn5x5_libri_tts_phonemes.nemo", ) results.append(model) return results @property def adapter_module_names(self) -> List[str]: return ['', 'encoder', 'decoder'] @property def wer(self): return self._wer @wer.setter def wer(self, wer): self._wer = wer