Summary:
Create a test runner for the eval_demo code. Debugging this is useful for understanding datasets.
Introduces an environment variable INTERACTIVE_TESTING for ignoring tests which are not intended for use in regular test runs.
Reviewed By: shapovalov
Differential Revision: D35964016
fbshipit-source-id: ab0f93aff66b6cfeca942b14466cf81f7feb2224
