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Add compression_ratio_hallucination_threshold

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Add compression_ratio_hallucination_threshold to Discard High Compression Ratio Segments in transcribe()

https://github.com/openai/whisper/discussions/2420
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Alexander Kuznetsov 2024-11-01 20:16:57 +03:00 committed by GitHub
parent 5979f03701
commit bb8c47519d
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1 changed files with 12 additions and 2 deletions
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whisper/transcribe.py
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@ -42,11 +42,11 @@ def transcribe(
verbose: Optional[bool] = None,
temperature: Union[float, Tuple[float, ...]] = (0.0, 0.2, 0.4, 0.6, 0.8, 1.0),
compression_ratio_threshold: Optional[float] = 2.4,
compression_ratio_halucination_threshold: Optional[float] = 3,
logprob_threshold: Optional[float] = -1.0,
no_speech_threshold: Optional[float] = 0.6,
condition_on_previous_text: bool = True,
initial_prompt: Optional[str] = None,
carry_initial_prompt: bool = False,
word_timestamps: bool = False,
prepend_punctuations: str = "\"'“¿([{-",
append_punctuations: str = "\"'.。,，!！?？:：”)]}、",
@ -76,6 +76,9 @@ def transcribe(
compression_ratio_threshold: float
If the gzip compression ratio is above this value, treat as failed
compression_ratio_halcination_threshold: float
If the gzip compression ratio is above this value after all attempts to decode, treat as a halucination and skip
logprob_threshold: float
If the average log probability over sampled tokens is below this value, treat as failed
@ -205,7 +208,7 @@ def transcribe(
compression_ratio_threshold is not None
and decode_result.compression_ratio > compression_ratio_threshold
):
needs_fallback = True # too repetitive
needs_fallback = True # too repetitive <-- We can inprove it...
if (
logprob_threshold is not None
and decode_result.avg_logprob < logprob_threshold
@ -216,6 +219,13 @@ def transcribe(
and decode_result.no_speech_prob > no_speech_threshold
):
needs_fallback = False # silence
if (
compression_ratio_halucination_threshold is not None
and decode_result.compression_ratio > compression_ratio_halucination_threshold
and t == temperatures[-1]
):
# Discard the segment
continue # Skip to the next segment
if not needs_fallback:
break