43 lines
1.5 KiB
Python
43 lines
1.5 KiB
Python
import random
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def sample_hotword(
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length,
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hotword_min_length,
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hotword_max_length,
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sample_rate,
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double_rate,
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pre_prob,
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pre_index=None,
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pre_hwlist=None,
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):
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if length < hotword_min_length:
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return [-1]
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if random.random() < sample_rate:
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if pre_prob > 0 and random.random() < pre_prob and pre_index is not None:
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return pre_index
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if length == hotword_min_length:
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return [0, length - 1]
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elif random.random() < double_rate and length > hotword_max_length + hotword_min_length + 2:
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# sample two hotwords in a sentence
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_max_hw_length = min(hotword_max_length, length // 2)
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# first hotword
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start1 = random.randint(0, length // 3)
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end1 = random.randint(start1 + hotword_min_length - 1, start1 + _max_hw_length - 1)
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# second hotword
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start2 = random.randint(end1 + 1, length - hotword_min_length)
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end2 = random.randint(
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min(length - 1, start2 + hotword_min_length - 1),
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min(length - 1, start2 + hotword_max_length - 1),
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)
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return [start1, end1, start2, end2]
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else: # single hotword
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start = random.randint(0, length - hotword_min_length)
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end = random.randint(
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min(length - 1, start + hotword_min_length - 1),
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min(length - 1, start + hotword_max_length - 1),
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)
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return [start, end]
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else:
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return [-1]
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