Richard Zou 68c2e014cb Handling for py2/py3 division differences (#11016) ...

Summary:
- In Python 2, use of `/` (regardless of int/float/Tensor) causes a compiler error if
  `from __future__ import division` is not imported in the file.
- The / operator is universally set to do "true" division for integers
- Added a `prim::FloorDiv` operator because it is used in loop unrolling.

The error if users use '/' in python 2 without importing from __future__
occurs when building the JIT AST.

cc apaszke zdevito
Pull Request resolved: https://github.com/pytorch/pytorch/pull/11016

Differential Revision: D9613527

Pulled By: zou3519

fbshipit-source-id: 0cebf44d5b8c92e203167733692ad33c4ec9dac6

2018-09-05 14:57:38 -07:00

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