Created by: pangyoki

PR types

Breaking changes

PR changes

Others

Describe

Paddle 2.0 uses dygraph mode by default. This PR change the default mode from static mode to dygraph mode.

1. use dygraph mode by default

In paddle/init.py, add disable_static() to change the default mode to dygraph mode.

2. manually change unittest to static mode

Unittest is realized based on static mode. It will cause conflicts when dygraph mode is opened by default. To solve this problem, before the unittest runs, switch the mode to static mode.