export-onnx-ctc.py
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#!/usr/bin/env python3
# Copyright 2024 Xiaomi Corp. (authors: Fangjun Kuang)
from typing import Dict
import onnx
import torch
import torchaudio
from nemo.collections.asr.models import EncDecCTCModel
from nemo.collections.asr.modules.audio_preprocessing import (
AudioToMelSpectrogramPreprocessor as NeMoAudioToMelSpectrogramPreprocessor,
)
from nemo.collections.asr.parts.preprocessing.features import (
FilterbankFeaturesTA as NeMoFilterbankFeaturesTA,
)
from onnxruntime.quantization import QuantType, quantize_dynamic
class FilterbankFeaturesTA(NeMoFilterbankFeaturesTA):
def __init__(self, mel_scale: str = "htk", wkwargs=None, **kwargs):
if "window_size" in kwargs:
del kwargs["window_size"]
if "window_stride" in kwargs:
del kwargs["window_stride"]
super().__init__(**kwargs)
self._mel_spec_extractor: torchaudio.transforms.MelSpectrogram = (
torchaudio.transforms.MelSpectrogram(
sample_rate=self._sample_rate,
win_length=self.win_length,
hop_length=self.hop_length,
n_mels=kwargs["nfilt"],
window_fn=self.torch_windows[kwargs["window"]],
mel_scale=mel_scale,
norm=kwargs["mel_norm"],
n_fft=kwargs["n_fft"],
f_max=kwargs.get("highfreq", None),
f_min=kwargs.get("lowfreq", 0),
wkwargs=wkwargs,
)
)
class AudioToMelSpectrogramPreprocessor(NeMoAudioToMelSpectrogramPreprocessor):
def __init__(self, mel_scale: str = "htk", **kwargs):
super().__init__(**kwargs)
kwargs["nfilt"] = kwargs["features"]
del kwargs["features"]
self.featurizer = (
FilterbankFeaturesTA( # Deprecated arguments; kept for config compatibility
mel_scale=mel_scale,
**kwargs,
)
)
def add_meta_data(filename: str, meta_data: Dict[str, str]):
"""Add meta data to an ONNX model. It is changed in-place.
Args:
filename:
Filename of the ONNX model to be changed.
meta_data:
Key-value pairs.
"""
model = onnx.load(filename)
while len(model.metadata_props):
model.metadata_props.pop()
for key, value in meta_data.items():
meta = model.metadata_props.add()
meta.key = key
meta.value = str(value)
onnx.save(model, filename)
@torch.no_grad()
def main():
model = EncDecCTCModel.from_config_file("./ctc_model_config.yaml")
ckpt = torch.load("./ctc_model_weights.ckpt", map_location="cpu")
model.load_state_dict(ckpt, strict=False)
model.eval()
# use characters
# space is 0
# <blk> is the last token
with open("tokens.txt", "w", encoding="utf-8") as f:
for i, t in enumerate(model.cfg.labels):
f.write(f"{t} {i}\n")
f.write(f"<blk> {i+1}\n")
filename = "model.onnx"
model.export(filename)
meta_data = {
"vocab_size": len(model.cfg.labels) + 1,
"normalize_type": "",
"subsampling_factor": 4,
"model_type": "EncDecCTCModel",
"version": "1",
"model_author": "https://github.com/salute-developers/GigaAM",
"license": "https://github.com/salute-developers/GigaAM/blob/main/GigaAM%20License_NC.pdf",
"language": "Russian",
"is_giga_am": 1,
}
add_meta_data(filename, meta_data)
filename_int8 = "model.int8.onnx"
quantize_dynamic(
model_input=filename,
model_output=filename_int8,
weight_type=QuantType.QUInt8,
)
if __name__ == "__main__":
main()