# -*- encoding: utf-8 -*-
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# @Author: SWHL
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# @Contact: liekkaskono@163.com
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import os.path
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from pathlib import Path
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from typing import List, Union, Tuple
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import librosa
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import numpy as np
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from .utils.utils import (CharTokenizer, Hypothesis, ONNXRuntimeError,
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OrtInferSession, TokenIDConverter, get_logger,
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read_yaml)
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from .utils.postprocess_utils import sentence_postprocess
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from .utils.frontend import WavFrontend
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logging = get_logger()
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class Paraformer():
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def __init__(self, model_dir: Union[str, Path] = None,
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batch_size: int = 1,
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device_id: Union[str, int] = "-1",
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):
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if not Path(model_dir).exists():
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raise FileNotFoundError(f'{model_dir} does not exist.')
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model_file = os.path.join(model_dir, 'model.onnx')
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config_file = os.path.join(model_dir, 'config.yaml')
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cmvn_file = os.path.join(model_dir, 'am.mvn')
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config = read_yaml(config_file)
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self.converter = TokenIDConverter(config['token_list'])
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self.tokenizer = CharTokenizer()
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self.frontend = WavFrontend(
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cmvn_file=cmvn_file,
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**config['frontend_conf']
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)
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self.ort_infer = OrtInferSession(model_file, device_id)
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self.batch_size = batch_size
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def __call__(self, wav_content: Union[str, np.ndarray, List[str]], **kwargs) -> List:
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waveform_list = self.load_data(wav_content, self.frontend.opts.frame_opts.samp_freq)
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waveform_nums = len(waveform_list)
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asr_res = []
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for beg_idx in range(0, waveform_nums, self.batch_size):
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end_idx = min(waveform_nums, beg_idx + self.batch_size)
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feats, feats_len = self.extract_feat(waveform_list[beg_idx:end_idx])
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try:
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am_scores, valid_token_lens = self.infer(feats, feats_len)
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except ONNXRuntimeError:
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#logging.warning(traceback.format_exc())
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logging.warning("input wav is silence or noise")
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preds = ['']
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else:
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preds = self.decode(am_scores, valid_token_lens)
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asr_res.extend(preds)
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return asr_res
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def load_data(self,
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wav_content: Union[str, np.ndarray, List[str]], fs: int = None) -> List:
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def load_wav(path: str) -> np.ndarray:
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waveform, _ = librosa.load(path, sr=fs)
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return waveform
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if isinstance(wav_content, np.ndarray):
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return [wav_content]
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if isinstance(wav_content, str):
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return [load_wav(wav_content)]
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if isinstance(wav_content, list):
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return [load_wav(path) for path in wav_content]
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raise TypeError(
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f'The type of {wav_content} is not in [str, np.ndarray, list]')
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def extract_feat(self,
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waveform_list: List[np.ndarray]
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) -> Tuple[np.ndarray, np.ndarray]:
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feats, feats_len = [], []
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for waveform in waveform_list:
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speech, _ = self.frontend.fbank(waveform)
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feat, feat_len = self.frontend.lfr_cmvn(speech)
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feats.append(feat)
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feats_len.append(feat_len)
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feats = self.pad_feats(feats, np.max(feats_len))
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feats_len = np.array(feats_len).astype(np.int32)
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return feats, feats_len
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@staticmethod
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def pad_feats(feats: List[np.ndarray], max_feat_len: int) -> np.ndarray:
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def pad_feat(feat: np.ndarray, cur_len: int) -> np.ndarray:
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pad_width = ((0, max_feat_len - cur_len), (0, 0))
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return np.pad(feat, pad_width, 'constant', constant_values=0)
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feat_res = [pad_feat(feat, feat.shape[0]) for feat in feats]
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feats = np.array(feat_res).astype(np.float32)
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return feats
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def infer(self, feats: np.ndarray,
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feats_len: np.ndarray) -> Tuple[np.ndarray, np.ndarray]:
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am_scores, token_nums = self.ort_infer([feats, feats_len])
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return am_scores, token_nums
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def decode(self, am_scores: np.ndarray, token_nums: int) -> List[str]:
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return [self.decode_one(am_score, token_num)
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for am_score, token_num in zip(am_scores, token_nums)]
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def decode_one(self,
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am_score: np.ndarray,
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valid_token_num: int) -> List[str]:
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yseq = am_score.argmax(axis=-1)
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score = am_score.max(axis=-1)
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score = np.sum(score, axis=-1)
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# pad with mask tokens to ensure compatibility with sos/eos tokens
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# asr_model.sos:1 asr_model.eos:2
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yseq = np.array([1] + yseq.tolist() + [2])
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hyp = Hypothesis(yseq=yseq, score=score)
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# remove sos/eos and get results
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last_pos = -1
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token_int = hyp.yseq[1:last_pos].tolist()
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# remove blank symbol id, which is assumed to be 0
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token_int = list(filter(lambda x: x not in (0, 2), token_int))
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# Change integer-ids to tokens
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token = self.converter.ids2tokens(token_int)
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token = token[:valid_token_num-1]
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texts = sentence_postprocess(token)
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text = texts[0]
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# text = self.tokenizer.tokens2text(token)
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return text
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