Summary:
It helps to develop scripts locally (when working outside of Flow). One doesn't have to rerun the script in order to catch exception in the debugger / add a print statement. (Flow does this kind of thing automatically)
Usage example:
```
if __name__ == '__main__':
workspace.GlobalInit(['caffe2', '--caffe2_log_level=2'])
from caffe2.python.utils import DebugMode
DebugMode.enable()
DebugMode.run(main)
```
Reviewed By: Yangqing
Differential Revision: D4424096
fbshipit-source-id: 73f418c80f581820e70139df7e166981e4d8c55f
Summary:
I got a weird error about NoneType not being iterable which made me think
it was some error in the C2 core, whereas it was an error in my code.
Reviewed By: Yangqing
Differential Revision: D4192799
fbshipit-source-id: 0122f13e205c1c6a0766545f0ad6296228d3a3d9
