Remove the fastNLP model. (#506)
Summary:
It will be replaced by a follow-up PR which contains a fixed, new fastNLP model.
Pull Request resolved: https://github.com/pytorch/benchmark/pull/506
Reviewed By: aaronenyeshi
Differential Revision: D31834289
Pulled By: xuzhao9
fbshipit-source-id: b06401f60df0d5b89af977cd7db12cda6fa58fcf
