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Bugfix: Illogical "Avoid computing higher temperatures on no_speech" (#1903)

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* Bugfix: Illogical "Avoid computing higher temperatures on no_speech"

Bugfix for https://github.com/openai/whisper/pull/1279

It's "silence" when decoding has failed due to `compression_ratio_threshold` too, when further down the code it's not "silence" anymore.

"Silence" should be only when decoding has failed due to `logprob_threshold`.

Like described there:
8bc8860694/whisper/transcribe.py (L421)

And in code there:
8bc8860694/whisper/transcribe.py (L243-L251)

* Fix if "logprob_threshold=None"

---------

Co-authored-by: Jong Wook Kim <jongwook@openai.com>
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whisper/transcribe.py
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@ -214,6 +214,8 @@ def transcribe(
if (
no_speech_threshold is not None
and decode_result.no_speech_prob > no_speech_threshold
and logprob_threshold is not None
and decode_result.avg_logprob < logprob_threshold
):
needs_fallback = False # silence
if not needs_fallback: