Merge pull request #2513 from WenmuZhou/2.1_require

update requirements.txt

requirements.txt

@@ -7,5 +7,4 @@ opencv-python==4.2.0.32
 tqdm
 numpy
 visualdl
-python-Levenshtein
-opencv-contrib-python
\ No newline at end of file
+python-Levenshtein
\ No newline at end of file