Nvidia_NeMo_Transcribe / speech_to_text_buffered_infer_ctc.py
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Duplicate from smajumdar/nemo_multilingual_language_id
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# 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.
"""
This script serves three goals:
(1) Demonstrate how to use NeMo Models outside of PytorchLightning
(2) Shows example of batch ASR inference
(3) Serves as CI test for pre-trained checkpoint
python speech_to_text_buffered_infer_ctc.py \
model_path=null \
pretrained_name=null \
audio_dir="<remove or path to folder of audio files>" \
dataset_manifest="<remove or path to manifest>" \
output_filename="<remove or specify output filename>" \
total_buffer_in_secs=4.0 \
chunk_len_in_secs=1.6 \
model_stride=4 \
batch_size=32
# NOTE:
You can use `DEBUG=1 python speech_to_text_buffered_infer_ctc.py ...` to print out the
predictions of the model, and ground-truth text if presents in manifest.
"""
import contextlib
import copy
import glob
import math
import os
from dataclasses import dataclass, is_dataclass
from typing import Optional
import torch
from omegaconf import OmegaConf
from nemo.collections.asr.parts.utils.streaming_utils import FrameBatchASR
from nemo.collections.asr.parts.utils.transcribe_utils import (
compute_output_filename,
get_buffered_pred_feat,
setup_model,
write_transcription,
)
from nemo.core.config import hydra_runner
from nemo.utils import logging
can_gpu = torch.cuda.is_available()
@dataclass
class TranscriptionConfig:
# Required configs
model_path: Optional[str] = None # Path to a .nemo file
pretrained_name: Optional[str] = None # Name of a pretrained model
audio_dir: Optional[str] = None # Path to a directory which contains audio files
dataset_manifest: Optional[str] = None # Path to dataset's JSON manifest
# General configs
output_filename: Optional[str] = None
batch_size: int = 32
num_workers: int = 0
append_pred: bool = False # Sets mode of work, if True it will add new field transcriptions.
pred_name_postfix: Optional[str] = None # If you need to use another model name, rather than standard one.
# Chunked configs
chunk_len_in_secs: float = 1.6 # Chunk length in seconds
total_buffer_in_secs: float = 4.0 # Length of buffer (chunk + left and right padding) in seconds
model_stride: int = 8 # Model downsampling factor, 8 for Citrinet models and 4 for Conformer models",
# Set `cuda` to int to define CUDA device. If 'None', will look for CUDA
# device anyway, and do inference on CPU only if CUDA device is not found.
# If `cuda` is a negative number, inference will be on CPU only.
cuda: Optional[int] = None
amp: bool = False
audio_type: str = "wav"
# Recompute model transcription, even if the output folder exists with scores.
overwrite_transcripts: bool = True
@hydra_runner(config_name="TranscriptionConfig", schema=TranscriptionConfig)
def main(cfg: TranscriptionConfig) -> TranscriptionConfig:
logging.info(f'Hydra config: {OmegaConf.to_yaml(cfg)}')
torch.set_grad_enabled(False)
if is_dataclass(cfg):
cfg = OmegaConf.structured(cfg)
if cfg.model_path is None and cfg.pretrained_name is None:
raise ValueError("Both cfg.model_path and cfg.pretrained_name cannot be None!")
if cfg.audio_dir is None and cfg.dataset_manifest is None:
raise ValueError("Both cfg.audio_dir and cfg.dataset_manifest cannot be None!")
filepaths = None
manifest = cfg.dataset_manifest
if cfg.audio_dir is not None:
filepaths = list(glob.glob(os.path.join(cfg.audio_dir, f"**/*.{cfg.audio_type}"), recursive=True))
manifest = None # ignore dataset_manifest if audio_dir and dataset_manifest both presents
# setup GPU
if cfg.cuda is None:
if torch.cuda.is_available():
device = [0] # use 0th CUDA device
accelerator = 'gpu'
else:
device = 1
accelerator = 'cpu'
else:
device = [cfg.cuda]
accelerator = 'gpu'
map_location = torch.device('cuda:{}'.format(device[0]) if accelerator == 'gpu' else 'cpu')
logging.info(f"Inference will be done on device : {device}")
asr_model, model_name = setup_model(cfg, map_location)
model_cfg = copy.deepcopy(asr_model._cfg)
OmegaConf.set_struct(model_cfg.preprocessor, False)
# some changes for streaming scenario
model_cfg.preprocessor.dither = 0.0
model_cfg.preprocessor.pad_to = 0
if model_cfg.preprocessor.normalize != "per_feature":
logging.error("Only EncDecCTCModelBPE models trained with per_feature normalization are supported currently")
# Disable config overwriting
OmegaConf.set_struct(model_cfg.preprocessor, True)
# setup AMP (optional)
if cfg.amp and torch.cuda.is_available() and hasattr(torch.cuda, 'amp') and hasattr(torch.cuda.amp, 'autocast'):
logging.info("AMP enabled!\n")
autocast = torch.cuda.amp.autocast
else:
@contextlib.contextmanager
def autocast():
yield
# Compute output filename
cfg = compute_output_filename(cfg, model_name)
# if transcripts should not be overwritten, and already exists, skip re-transcription step and return
if not cfg.overwrite_transcripts and os.path.exists(cfg.output_filename):
logging.info(
f"Previous transcripts found at {cfg.output_filename}, and flag `overwrite_transcripts`"
f"is {cfg.overwrite_transcripts}. Returning without re-transcribing text."
)
return cfg
asr_model.eval()
asr_model = asr_model.to(asr_model.device)
feature_stride = model_cfg.preprocessor['window_stride']
model_stride_in_secs = feature_stride * cfg.model_stride
total_buffer = cfg.total_buffer_in_secs
chunk_len = float(cfg.chunk_len_in_secs)
tokens_per_chunk = math.ceil(chunk_len / model_stride_in_secs)
mid_delay = math.ceil((chunk_len + (total_buffer - chunk_len) / 2) / model_stride_in_secs)
logging.info(f"tokens_per_chunk is {tokens_per_chunk}, mid_delay is {mid_delay}")
frame_asr = FrameBatchASR(
asr_model=asr_model, frame_len=chunk_len, total_buffer=cfg.total_buffer_in_secs, batch_size=cfg.batch_size,
)
hyps = get_buffered_pred_feat(
frame_asr,
chunk_len,
tokens_per_chunk,
mid_delay,
model_cfg.preprocessor,
model_stride_in_secs,
asr_model.device,
manifest,
filepaths,
)
output_filename = write_transcription(hyps, cfg, model_name, filepaths=filepaths, compute_langs=False)
logging.info(f"Finished writing predictions to {output_filename}!")
return cfg
if __name__ == '__main__':
main() # noqa pylint: disable=no-value-for-parameter