add docstrings, refactor logger

Former-commit-id: c34e489d71f8f539028543ccf8ee92cecedd6276

src/llamafactory/chat/hf_engine.py

@@ -20,6 +20,7 @@ from typing import TYPE_CHECKING, Any, AsyncGenerator, Callable, Dict, List, Opt
 
 import torch
 from transformers import GenerationConfig, TextIteratorStreamer
+from typing_extensions import override
 
 from ..data import get_template_and_fix_tokenizer
 from ..extras.constants import IMAGE_PLACEHOLDER, VIDEO_PLACEHOLDER
@@ -271,6 +272,7 @@ class HuggingfaceEngine(BaseEngine):
 
         return scores
 
+    @override
     async def chat(
         self,
         messages: Sequence[Dict[str, str]],
@@ -301,6 +303,7 @@ class HuggingfaceEngine(BaseEngine):
             with concurrent.futures.ThreadPoolExecutor() as pool:
                 return await loop.run_in_executor(pool, self._chat, *input_args)
 
+    @override
     async def stream_chat(
         self,
         messages: Sequence[Dict[str, str]],
@@ -336,6 +339,7 @@ class HuggingfaceEngine(BaseEngine):
                     except StopAsyncIteration:
                         break
 
+    @override
     async def get_scores(
         self,
         batch_input: List[str],