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Fix probability computation in WhisperNoSpeechDetection when recomputing scores #29248

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merged 3 commits into from Apr 3, 2024
Merged

Fix probability computation in WhisperNoSpeechDetection when recomputing scores #29248

merged 3 commits into from Apr 3, 2024

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cifkao
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@cifkao cifkao commented Feb 23, 2024 •
edited

What does this PR do?

Fix #29313.

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  • This PR fixes a typo or improves the docs (you can dismiss the other checks if that's the case).
  • Did you read the contributor guideline, Pull Request section?
  • Was this discussed/approved via a Github issue or the forum? Please add a link to it if that's the case.
  • Did you make sure to update the documentation with your changes? Here are the documentation guidelines, and here are tips on formatting docstrings.
  • Did you write any new necessary tests?

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@patrickvonplaten @sanchit-gandhi @ylacombe

ArthurZucker
ArthurZucker reviewed Mar 30, 2024
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For whisper, num_beams > 1 paths seems a bit tricky. Would you mind adding a test to make sure we have the expected new results?

@cifkao
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cifkao commented Mar 30, 2024 •
edited

@ArthurZucker I added a slow test where I set the logprob_threshold to 0 to make sure the no-speech detection is triggered. Without the fix, all the outputs are empty because all the no-speech probabilities are >1.

@ylacombe
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ylacombe commented Apr 1, 2024

Hey @cifkao, thanks for the PR!
Could you make sure to rebase the branch to fix the failing test ?

This scenario arises when the model is called with language set and with num_beams > 1.

Also, could you point out why this scenario applies when language is set ? I understand the case for num_beams>1 but don't see the point for the other case!
Many thanks!

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@ylacombe ylacombe mentioned this pull request Apr 1, 2024
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cifkao commented Apr 1, 2024 •
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Also, could you point out why this scenario applies when language is set ? I understand the case for num_beams>1 but don't see the point for the other case!

@ylacombe The bug manifests only when both conditions (num_beams > 1 and language set) are true. The latter condition causes decoding to start after the language token, which is why we need to call the model again to get the logits at that position (which are then incorrectly treated as log-probabilities). With language unset, the decoding starts from the beginning, so we never enter that branch.

sanchit-gandhi
sanchit-gandhi approved these changes Apr 2, 2024
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Thanks for this fix @cifkao!

src/transformers/generation/logits_process.py
if input_ids.shape[1] == self.begin_index:
if self.start_of_trans_offset > 1:
with torch.no_grad():
logits = self.model(**self.inputs).logits

no_speech_index = self.begin_index - self.start_of_trans_offset
no_speech_scores = logits[:, no_speech_index]
is_scores_logprobs = False
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Nice catch!

tests/models/whisper/test_modeling_whisper.py
@@ -2615,6 +2615,59 @@ def test_whisper_longform_multi_batch_hard_prev_cond(self):
for i in range(num_samples):
assert decoded_all[i] == EXPECTED_TEXT[i]

@slow
def test_whisper_longform_no_speech_detection(self):
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Thanks for adding this slow test! Just to confirm, before the fix all the transcriptions are empty due to the no-speech probabilities exceeding 1?

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Exactly.

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Ready for final review from @ArthurZucker

ArthurZucker
ArthurZucker approved these changes Apr 3, 2024
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🤯 awesome catch!

@ArthurZucker ArthurZucker merged commit 240e106 into huggingface:main Apr 3, 2024
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Thank you for taking the time to add a test 🔥

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Thanks for the contribution @cifkao!

ArthurZucker pushed a commit that referenced this pull request Apr 22, 2024
@cifkao @ArthurZucker
Fix probability computation in WhisperNoSpeechDetection when recomp…
50c056c 
…uting scores (#29248)

* Fix is_scores_logprobs in WhisperNoSpeechDetection

* Add test_whisper_longform_no_speech_detection

* Fix typo
itazap pushed a commit that referenced this pull request May 14, 2024
@cifkao
Fix probability computation in WhisperNoSpeechDetection when recomp…
eb964d2 
…uting scores (#29248)

* Fix is_scores_logprobs in WhisperNoSpeechDetection

* Add test_whisper_longform_no_speech_detection

* Fix typo
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@ArthurZucker ArthurZucker ArthurZucker approved these changes

@sanchit-gandhi sanchit-gandhi sanchit-gandhi approved these changes

@ylacombe ylacombe Awaiting requested review from ylacombe

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Incorrect no-speech probability in WhisperNoSpeechDetection when language is set and num_beams > 1
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@cifkao @ylacombe @HuggingFaceDocBuilderDev @sanchit-gandhi @ArthurZucker