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Fix infinite loop caused by incorrect timestamp tokens prediction (#914)

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* Fix infinite loop caused by incorrect timestamp tokens prediction

https://github.com/openai/whisper/discussions/810

* Update decoding.py

---------

Co-authored-by: Jong Wook Kim <jongwook@openai.com>
This commit is contained in:
Andrey Chernykh 2023-02-02 06:46:51 +07:00 committed by GitHub
parent 5c1a8c10e7
commit 7858aa9c08
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1 changed files with 7 additions and 1 deletions
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whisper/decoding.py
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@ -412,7 +412,8 @@ class ApplyTimestampRules(LogitFilter):
# timestamps have to appear in pairs, except directly before EOT; mask logits accordingly
for k in range(tokens.shape[0]):
seq = [t for t in tokens[k, self.sample_begin :].tolist()]
sampled_tokens = tokens[k, self.sample_begin :]
seq = [t for t in sampled_tokens.tolist()]
last_was_timestamp = len(seq) >= 1 and seq[-1] >= self.tokenizer.timestamp_begin
penultimate_was_timestamp = len(seq) < 2 or seq[-2] >= self.tokenizer.timestamp_begin
@ -422,6 +423,11 @@ class ApplyTimestampRules(LogitFilter):
else: # cannot be normal text tokens
logits[k, : self.tokenizer.eot] = -np.inf
timestamps = sampled_tokens[sampled_tokens.ge(self.tokenizer.timestamp_begin)]
if timestamps.numel() > 0:
# timestamps shouldn't decrease; forbid timestamp tokens smaller than the last
logits[k, self.tokenizer.timestamp_begin : timestamps[-1]] = -np.inf
if tokens.shape[1] == self.sample_begin:
# suppress generating non-timestamp tokens at the beginning
logits[:, : self.tokenizer.timestamp_begin] = -np.inf