Add function to clear model words

[tazz4843]

Hi there! I'm trying to save compute resources by reusing WhisperContext objects in a STT server instance, but if no words were detected in the audio, it will cause whatever words were found in the last transcription that had words detected to be spit out again. This is a major issue, and I'd like a way to prevent this. The easiest way I can think of is adding a function to clear the words stored in the model. I considered adding such a feature to my app, but I realized this could cause serious overhead and introduce user privacy risks from storing many sentences compared to just clearing the words from the model itself. Thanks!

[ggerganov]

Before extending the interface of whisper.cpp can you confirm that setting params.no_context = true; fixes the repetition:

whisper.cpp/whisper.h

Line 169 in b2f1600

bool no_context;

[tazz4843]

Setting params.no_context = true does not fix the repetition, or cause any noticeable change in output.

[ggerganov]

I think the latest change should resolve your problem - give it a try

[tazz4843]

It does fix the issue, thanks!