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enginex-mr_series-sherpa-onnx/scripts/wenet/export-onnx.py
2023-11-15 14:23:20 +08:00

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#!/usr/bin/env python3
# Copyright 2023 Xiaomi Corp. (authors: Fangjun Kuang)
# pip install git+https://github.com/wenet-e2e/wenet.git
# pip install onnxruntime onnx pyyaml
# cp -a ~/open-source/wenet/wenet/transducer/search .
# cp -a ~/open-source//wenet/wenet/e_branchformer .
# cp -a ~/open-source/wenet/wenet/ctl_model .
import os
from typing import Dict
import onnx
import torch
import yaml
from onnxruntime.quantization import QuantType, quantize_dynamic
from wenet.utils.init_model import init_model
class Foo:
pass
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)
for key, value in meta_data.items():
meta = model.metadata_props.add()
meta.key = key
meta.value = str(value)
onnx.save(model, filename)
class OnnxModel(torch.nn.Module):
def __init__(self, encoder: torch.nn.Module, ctc: torch.nn.Module):
super().__init__()
self.encoder = encoder
self.ctc = ctc
def forward(self, x, x_lens):
"""
Args:
x:
A 3-D tensor of shape (N, T, C)
x_lens:
A 1-D tensor of shape (N,) containing valid lengths in x before
padding. Its type is torch.int64
"""
encoder_out, encoder_out_mask = self.encoder(
x,
x_lens,
decoding_chunk_size=-1,
num_decoding_left_chunks=-1,
)
log_probs = self.ctc.log_softmax(encoder_out)
log_probs_lens = encoder_out_mask.int().squeeze(1).sum(1)
return log_probs, log_probs_lens
@torch.no_grad()
def main():
args = Foo()
args.checkpoint = "./final.pt"
config_file = "./train.yaml"
with open(config_file, "r") as fin:
configs = yaml.load(fin, Loader=yaml.FullLoader)
torch_model, configs = init_model(args, configs)
torch_model.eval()
onnx_model = OnnxModel(encoder=torch_model.encoder, ctc=torch_model.ctc)
filename = "model.onnx"
N = 1
T = 1000
C = 80
x = torch.rand(N, T, C, dtype=torch.float)
x_lens = torch.full((N,), fill_value=T, dtype=torch.int64)
opset_version = 13
onnx_model = torch.jit.script(onnx_model)
torch.onnx.export(
onnx_model,
(x, x_lens),
filename,
opset_version=opset_version,
input_names=["x", "x_lens"],
output_names=["log_probs", "log_probs_lens"],
dynamic_axes={
"x": {0: "N", 1: "T"},
"x_lens": {0: "N"},
"log_probs": {0: "N", 1: "T"},
"log_probs_lens": {0: "N"},
},
)
# https://wenet.org.cn/downloads?models=wenet&version=aishell_u2pp_conformer_exp.tar.gz
url = os.environ.get("WENET_URL", "")
meta_data = {
"model_type": "wenet_ctc",
"version": "1",
"model_author": "wenet",
"comment": "non-streaming",
"subsampling_factor": torch_model.encoder.embed.subsampling_rate,
"vocab_size": torch_model.ctc.ctc_lo.weight.shape[0],
"url": url,
}
add_meta_data(filename=filename, meta_data=meta_data)
print("Generate int8 quantization models")
filename_int8 = f"model.int8.onnx"
quantize_dynamic(
model_input=filename,
model_output=filename_int8,
op_types_to_quantize=["MatMul"],
weight_type=QuantType.QInt8,
)
if __name__ == "__main__":
main()