update requirements

dygraph/requirements.txt

@@ -4,7 +4,8 @@ colorama
 cython
 pycocotools
 visualdl >= 2.1.1
-paddleslim == 2.0.0
+paddleslim == 2.1.0
 shapely
 paddlepaddle-gpu==2.1.0
 opencv-python
+-r PaddleClas/requirements.txt