* Update stacked_dynamic_lstm.py

* Update machine_translation.py

* Update mnist.py

* Update resnet.py

* Update vgg.py

* "add metrics"

* "add fluid metrics"

* "add import guards"

* "show warnings"

* "add demo"

* "fix ci"

* "add some details"

* "fix cci"

* "add demo Python"

* "add metrics"