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/nlp/term_weight.py

@@ -21,6 +21,7 @@ import os
 import numpy as np
 from rag.nlp import rag_tokenizer
 from api.utils.file_utils import get_project_base_directory
+from api.utils.log_utils import logger
 
 
 class Dealer:
@@ -81,12 +82,12 @@ class Dealer:
         self.ne, self.df = {}, {}
         try:
             self.ne = json.load(open(os.path.join(fnm, "ner.json"), "r"))
-        except Exception as e:
-            print("[WARNING] Load ner.json FAIL!")
+        except Exception:
+            logger.warning("Load ner.json FAIL!")
         try:
             self.df = load_dict(os.path.join(fnm, "term.freq"))
-        except Exception as e:
-            print("[WARNING] Load term.freq FAIL!")
+        except Exception:
+            logger.warning("Load term.freq FAIL!")
 
     def pretoken(self, txt, num=False, stpwd=True):
         patt = [