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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