fix #917 #915 (#946)

### What problem does this PR solve?

#917 
#915

### Type of change

- [x] Bug Fix (non-breaking change which fixes an issue)

rag/nlp/rag_tokenizer.py

@@ -24,7 +24,7 @@ class RagTokenizer:
     def loadDict_(self, fnm):
         print("[HUQIE]:Build trie", fnm, file=sys.stderr)
         try:
-            of = open(fnm, "r")
+            of = open(fnm, "r", encoding='utf-8')
             while True:
                 line = of.readline()
                 if not line: