Better handle CUDA out of memory errors in chat mode

modules/chat.py

@@ -119,6 +119,7 @@ def chatbot_wrapper(text, max_new_tokens, do_sample, temperature, top_p, typical
     # Generate
     cumulative_reply = ''
     for i in range(chat_generation_attempts):
+        reply = None
         for reply in generate_reply(f"{prompt}{' ' if len(cumulative_reply) > 0 else ''}{cumulative_reply}", max_new_tokens, do_sample, temperature, top_p, typical_p, repetition_penalty, encoder_repetition_penalty, top_k, min_length, no_repeat_ngram_size, num_beams, penalty_alpha, length_penalty, early_stopping, seed, eos_token=eos_token, stopping_strings=[f"\n{name1}:", f"\n{name2}:"]):
             reply = cumulative_reply + reply
 
@@ -145,7 +146,8 @@ def chatbot_wrapper(text, max_new_tokens, do_sample, temperature, top_p, typical
             if next_character_found:
                 break
 
-        cumulative_reply = reply
+        if reply is not None:
+            cumulative_reply = reply
 
     yield shared.history['visible']
 
@@ -162,6 +164,7 @@ def impersonate_wrapper(text, max_new_tokens, do_sample, temperature, top_p, typ
 
     cumulative_reply = ''
     for i in range(chat_generation_attempts):
+        reply = None
         for reply in generate_reply(f"{prompt}{' ' if len(cumulative_reply) > 0 else ''}{cumulative_reply}", max_new_tokens, do_sample, temperature, top_p, typical_p, repetition_penalty, encoder_repetition_penalty, top_k, min_length, no_repeat_ngram_size, num_beams, penalty_alpha, length_penalty, early_stopping, seed, eos_token=eos_token, stopping_strings=[f"\n{name1}:", f"\n{name2}:"]):
             reply = cumulative_reply + reply
             reply, next_character_found = extract_message_from_reply(reply, name1, name2, check)
@@ -169,7 +172,8 @@ def impersonate_wrapper(text, max_new_tokens, do_sample, temperature, top_p, typ
             if next_character_found:
                 break
 
-        cumulative_reply = reply
+        if reply is not None:
+            cumulative_reply = reply
 
     yield reply