Rework logging (#3358)

Unified all log files into one.

### What problem does this PR solve?

Unified all log files into one.

### Type of change

- [x] Refactoring

rag/llm/rerank_model.py

@@ -27,6 +27,7 @@ from api.settings import LIGHTEN
 from api.utils.file_utils import get_home_cache_dir
 from rag.utils import num_tokens_from_string, truncate
 import json
+from api.utils.log_utils import logger
 
 
 def sigmoid(x):
@@ -66,7 +67,7 @@ class DefaultRerank(Base):
                         DefaultRerank._model = FlagReranker(
                             os.path.join(get_home_cache_dir(), re.sub(r"^[a-zA-Z]+/", "", model_name)),
                             use_fp16=torch.cuda.is_available())
-                    except Exception as e:
+                    except Exception:
                         model_dir = snapshot_download(repo_id=model_name,
                                                       local_dir=os.path.join(get_home_cache_dir(),
                                                                              re.sub(r"^[a-zA-Z]+/", "", model_name)),
@@ -126,11 +127,11 @@ class YoudaoRerank(DefaultRerank):
             with YoudaoRerank._model_lock:
                 if not YoudaoRerank._model:
                     try:
-                        print("LOADING BCE...")
+                        logger.info("LOADING BCE...")
                         YoudaoRerank._model = RerankerModel(model_name_or_path=os.path.join(
                             get_home_cache_dir(),
                             re.sub(r"^[a-zA-Z]+/", "", model_name)))
-                    except Exception as e:
+                    except Exception:
                         YoudaoRerank._model = RerankerModel(
                             model_name_or_path=model_name.replace(
                                 "maidalun1020", "InfiniFlow"))