fix CJK output again

Author: MeouSker77

llama_cpp/llama.py

@@ -1003,13 +1003,15 @@ def _create_completion(
                             break
 
                 token_end_position = 0
-                for token in remaining_tokens:
-                    token_end_position += len(self.detokenize([token]))
-                    # Check if stop sequence is in the token
-                    if token_end_position >= (remaining_length - first_stop_position):
-                        break
-                    logprobs_or_none: Optional[CompletionLogprobs] = None
-                    if logprobs is not None:
+
+                if logprobs is not None:
+                    # not sure how to handle this branch when dealing
+                    # with CJK output, so keep it unchanged
+                    for token in remaining_tokens:
+                        token_end_position += len(self.detokenize([token]))
+                        # Check if stop sequence is in the token
+                        if token_end_position > (remaining_length - first_stop_position):
+                            break
                         token_str = self.detokenize([token]).decode(
                             "utf-8", errors="ignore"
                         )
@@ -1042,23 +1044,58 @@ def _create_completion(
                             "token_logprobs": [current_logprobs[int(token)]],
                             "top_logprobs": [top_logprob],
                         }
-                    returned_tokens += 1
-                    yield {
-                        "id": completion_id,
-                        "object": "text_completion",
-                        "created": created,
-                        "model": model_name,
-                        "choices": [
-                            {
-                                "text": self.detokenize([token]).decode(
-                                    "utf-8", errors="ignore"
-                                ),
-                                "index": 0,
-                                "logprobs": logprobs_or_none,
-                                "finish_reason": None,
-                            }
-                        ],
-                    }
+                        returned_tokens += 1
+                        yield {
+                            "id": completion_id,
+                            "object": "text_completion",
+                            "created": created,
+                            "model": model_name,
+                            "choices": [
+                                {
+                                    "text": self.detokenize([token]).decode(
+                                        "utf-8", errors="ignore"
+                                    ),
+                                    "index": 0,
+                                    "logprobs": logprobs_or_none,
+                                    "finish_reason": None,
+                                }
+                            ],
+                        }
+                else:
+                    while len(remaining_tokens) > 0:
+                        decode_success = False
+                        for i in range(1, len(remaining_tokens) + 1):
+                            tokens = remaining_tokens[:i]
+                            try:
+                                bs = self.detokenize(tokens)
+                                text = bs.decode('utf-8')
+                                decode_success = True
+                                break
+                            except UnicodeError:
+                                pass
+                        if not decode_success:
+                            # all remaining tokens cannot be decoded to a UTF-8 character
+                            break
+                        token_end_position += len(bs)
+                        if token_end_position > (remaining_length - first_stop_position):
+                            break
+                        remaining_tokens = remaining_tokens[i:]
+                        returned_tokens += i
+
+                        yield {
+                            "id": completion_id,
+                            "object": "text_completion",
+                            "created": created,
+                            "model": model_name,
+                            "choices": [
+                                {
+                                    "text": text,
+                                    "index": 0,
+                                    "logprobs": None,
+                                    "finish_reason": None,
+                                }
+                            ],
+                        }
 
             if len(completion_tokens) >= max_tokens:
                 text = self.detokenize(completion_tokens)