update the requirements during testing

tests/requirements.txt

@@ -1,15 +1,4 @@
-# required packages for testing
+# additional required packages for testing
 tensorflow==1.15.0
-numpy==1.18.5
 onnx==1.9.0
-tqdm==4.47.0
-matplotlib==2.2.2
-graphviz==0.14
-networkx==2.4
-requests==2.22.0
-protobuf==3.17.1
-PyYAML==5.4.1
-scikit_learn==0.24.2
 torch==1.8.1
-flake8==3.9.2
-packaging==21.0