whisper : do not provide past prompt when n_max_text_ctx == 0

whisper.cpp

@@ -3524,7 +3524,7 @@ 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 && params.n_max_text_ctx > 0) {
                     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) };
@@ -3535,11 +3535,11 @@ int whisper_full(
                 prompt.insert(prompt.end(), prompt_init.begin(), prompt_init.end());
 
                 // print the prompt
-                //WHISPER_PRINT_DEBUG("\n\n");
-                //for (int i = 0; i < (int) prompt.size(); i++) {
-                //    WHISPER_PRINT_DEBUG("%s: prompt[%d] = %s\n", __func__, i, ctx->vocab.id_to_token.at(prompt[i]).c_str());
-                //}
-                //WHISPER_PRINT_DEBUG("\n\n");
+                WHISPER_PRINT_DEBUG("\n\n");
+                for (int i = 0; i < (int) prompt.size(); i++) {
+                    WHISPER_PRINT_DEBUG("%s: prompt[%d] = %s\n", __func__, i, ctx->vocab.id_to_token.at(prompt[i]).c_str());
+                }
+                WHISPER_PRINT_DEBUG("\n\n");
 
                 if (!whisper_decode(*ctx, ctx->decoders[0], prompt.data(), prompt.size(), 0, params.n_threads)) {
                     fprintf(stderr, "%s: failed to decode\n", __func__);