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 time_stamp_lfr6_pl(us_alphas, us_cif_peak, char_list, begin_time=0.0, end_time=None):
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if not len(char_list):
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return []
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START_END_THRESHOLD = 5
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TIME_RATE = 10.0 * 6 / 1000 / 3 # 3 times upsampled
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if len(us_alphas.shape) == 3:
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alphas, cif_peak = us_alphas[0], us_cif_peak[0] # support inference batch_size=1 only
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else:
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alphas, cif_peak = us_alphas, us_cif_peak
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num_frames = cif_peak.shape[0]
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if char_list[-1] == '</s>':
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char_list = char_list[:-1]
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# char_list = [i for i in text]
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timestamp_list = []
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# for bicif model trained with large data, cif2 actually fires when a character starts
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# so treat the frames between two peaks as the duration of the former token
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fire_place = torch.where(cif_peak>1.0-1e-4)[0].cpu().numpy() - 1.5
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num_peak = len(fire_place)
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assert num_peak == len(char_list) + 1 # number of peaks is supposed to be number of tokens + 1
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# begin silence
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if fire_place[0] > START_END_THRESHOLD:
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char_list.insert(0, '<sil>')
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timestamp_list.append([0.0, fire_place[0]*TIME_RATE])
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# tokens timestamp
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for i in range(len(fire_place)-1):
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# the peak is always a little ahead of the start time
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# timestamp_list.append([(fire_place[i]-1.2)*TIME_RATE, fire_place[i+1]*TIME_RATE])
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timestamp_list.append([(fire_place[i])*TIME_RATE, fire_place[i+1]*TIME_RATE])
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# cut the duration to token and sil of the 0-weight frames last long
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# tail token and end silence
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if num_frames - fire_place[-1] > START_END_THRESHOLD:
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_end = (num_frames + fire_place[-1]) / 2
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timestamp_list[-1][1] = _end*TIME_RATE
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timestamp_list.append([_end*TIME_RATE, num_frames*TIME_RATE])
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char_list.append("<sil>")
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else:
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timestamp_list[-1][1] = num_frames*TIME_RATE
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if begin_time: # add offset time in model with vad
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for i in range(len(timestamp_list)):
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timestamp_list[i][0] = timestamp_list[i][0] + begin_time / 1000.0
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timestamp_list[i][1] = timestamp_list[i][1] + begin_time / 1000.0
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res_txt = ""
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for char, timestamp in zip(char_list, timestamp_list):
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res_txt += "{} {} {};".format(char, timestamp[0], timestamp[1])
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res = []
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for char, timestamp in zip(char_list, timestamp_list):
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if char != '<sil>':
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res.append([int(timestamp[0] * 1000), int(timestamp[1] * 1000)])
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return res
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