import torch
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import copy
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import logging
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import numpy as np
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from typing import Any, List, Tuple, Union
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def cut_interval(alphas: torch.Tensor, start: int, end: int, tail: bool):
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if not tail:
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if end == start + 1:
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cut = (end + start) / 2.0
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else:
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alpha = alphas[start+1: end].tolist()
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reverse_steps = 1
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for reverse_alpha in alpha[::-1]:
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if reverse_alpha > 0.35:
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reverse_steps += 1
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else:
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break
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cut = end - reverse_steps
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else:
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if end != len(alphas) - 1:
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cut = end + 1
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else:
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cut = start + 1
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return float(cut)
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def time_stamp_lfr6(alphas: torch.Tensor, speech_lengths: torch.Tensor, raw_text: List[str], begin: int = 0, end: int = None):
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time_stamp_list = []
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alphas = alphas[0]
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text = copy.deepcopy(raw_text)
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if end is None:
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time = speech_lengths * 60 / 1000
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sacle_rate = (time / speech_lengths[0]).tolist()
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else:
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time = (end - begin) / 1000
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sacle_rate = (time / speech_lengths[0]).tolist()
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predictor = (alphas > 0.5).int()
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fire_places = torch.nonzero(predictor == 1).squeeze(1).tolist()
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cuts = []
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npeak = int(predictor.sum())
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nchar = len(raw_text)
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if npeak - 1 == nchar:
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fire_places = torch.where((alphas > 0.5) == 1)[0].tolist()
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for i in range(len(fire_places)):
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if fire_places[i] < len(alphas) - 1:
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if 0.05 < alphas[fire_places[i]+1] < 0.5:
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fire_places[i] += 1
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elif npeak < nchar:
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lost_num = nchar - npeak
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lost_fire = speech_lengths[0].tolist() - fire_places[-1]
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interval_distance = lost_fire // (lost_num + 1)
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for i in range(1, lost_num + 1):
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fire_places.append(fire_places[-1] + interval_distance)
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elif npeak - 1 > nchar:
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redundance_num = npeak - 1 - nchar
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for i in range(redundance_num):
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fire_places.pop()
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cuts.append(0)
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start_sil = True
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if start_sil:
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text.insert(0, '<sil>')
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for i in range(len(fire_places)-1):
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cuts.append(cut_interval(alphas, fire_places[i], fire_places[i+1], tail=(i==len(fire_places)-2)))
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for i in range(2, len(fire_places)-2):
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if fire_places[i-2] == fire_places[i-1] - 1 and fire_places[i-1] != fire_places[i] - 1:
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cuts[i-1] += 1
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if cuts[-1] != len(alphas) - 1:
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text.append('<sil>')
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cuts.append(speech_lengths[0].tolist())
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cuts.insert(-1, (cuts[-1] + cuts[-2]) * 0.5)
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sec_fire_places = np.array(cuts) * sacle_rate
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for i in range(1, len(sec_fire_places) - 1):
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start, end = sec_fire_places[i], sec_fire_places[i+1]
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if i == len(sec_fire_places) - 2:
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end = time
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time_stamp_list.append([int(round(start, 2) * 1000) + begin, int(round(end, 2) * 1000) + begin])
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text = text[1:]
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if npeak - 1 == nchar or npeak > nchar:
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return time_stamp_list[:-1]
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else:
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return time_stamp_list
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def time_stamp_lfr6_advance(tst: List, text: str):
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# advanced timestamp prediction for BiCIF_Paraformer using upsampled alphas
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ds_alphas, ds_cif_peak, us_alphas, us_cif_peak = tst
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if text.endswith('</s>'):
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text = text[:-4]
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else:
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text = text[:-1]
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logging.warning("found text does not end with </s>")
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assert int(ds_alphas.sum() + 1e-4) - 1 == len(text)
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