whisper : fix condition for providing past prompt (critical)

This bug has been present since v1.1.0.

Effectively, the past transcribed text wasn't being used for following
transcriptions, which likely significantly reduces the transcription
quality.

Likely related to #419

diff --git a/whisper.cpp b/whisper.cpp
index 6014cb187e3cf4245c17a8ac85c38f0a62873d55..81458a59f63508264a10cd7914d4ea8e065c7ba2 100644 (file)
--- a/whisper.cpp
+++ b/whisper.cpp
@@ -3449,7 +3449,7 @@ int whisper_full(
                 prompt.clear();
 
                 // if we have already generated some text, use it as a prompt to condition the next generation
-                if (!prompt_past.empty() && t_cur > 0.5f) {
+                if (!prompt_past.empty() && t_cur < 0.5f) {
                     int n_take = std::min(std::min(params.n_max_text_ctx, whisper_n_text_ctx(ctx)/2), int(prompt_past.size()));
 
                     prompt = { whisper_token_prev(ctx) };