fixed tensorflow version mismatch caused by conda (#403)

Author: maxkazmsft

environment/anaconda/local/environment.yml

@@ -12,7 +12,6 @@ dependencies:
   - torchvision>=0.5.0
   - pandas==0.25.3
   - scikit-learn==0.21.3
-  - tensorflow==2.1
   - opt-einsum>=2.3.2
   - tqdm==4.39.0
   - itkwidgets==0.23.1
@@ -27,6 +26,7 @@ dependencies:
     - tabulate==0.8.2
     - Jinja2==2.10.3
     - gitpython==3.0.6
+    - tensorflow==2.1
     - tensorboard==2.0.1
     - tensorboardx==1.9
     - invoke==1.3.0