Remove unneccessary dependencies in pipeline (#1597)

* refactor pipeline dependencies

test/pipelines-it-kubeflow.yml

@@ -39,11 +39,6 @@ jobs:
     displayName: 'Install nni toolkit via source code'
 
   - script: |
-      python3 -m pip install scikit-learn==0.20.0 --user
-      python3 -m pip install torch==0.4.1 --user
-      python3 -m pip install torchvision==0.2.1 --user
-      python3 -m pip install keras==2.1.6 --user
-      python3 -m pip install tensorflow==1.12.0 --user
       sudo apt-get install swig -y
       PATH=$HOME/.local/bin:$PATH nnictl package install --name=SMAC
       PATH=$HOME/.local/bin:$PATH nnictl package install --name=BOHB

test/pipelines-it-local.yml

@@ -9,8 +9,8 @@ jobs:
     displayName: 'Install nni toolkit via source code'
   - script: |
       python3 -m pip install scikit-learn==0.20.0 --user
-      python3 -m pip install torch==0.4.1 --user
-      python3 -m pip install torchvision==0.2.1 --user
+      python3 -m pip install torch==1.2.0 --user
+      python3 -m pip install torchvision==0.4.0 --user
       python3 -m pip install keras==2.1.6 --user
       python3 -m pip install tensorflow-gpu==1.12.0 --user
       sudo apt-get install swig -y

test/pipelines-it-pai.yml

@@ -39,11 +39,6 @@ jobs:
     displayName: 'Install nni toolkit via source code'
 
   - script: |
-      python3 -m pip install scikit-learn==0.20.0 --user
-      python3 -m pip install torch==0.4.1 --user
-      python3 -m pip install torchvision==0.2.1 --user
-      python3 -m pip install keras==2.1.6 --user
-      python3 -m pip install tensorflow-gpu==1.12.0 --user
       sudo apt-get install swig -y
       PATH=$HOME/.local/bin:$PATH nnictl package install --name=SMAC
       PATH=$HOME/.local/bin:$PATH nnictl package install --name=BOHB