[WIP] experiments PACT

[ruimashita]

Work in progress PR. try PACT quantization https://arxiv.org/abs/1805.06085

Motivation and Context

Description

How has this been tested?

Screenshots (if appropriate):

Types of changes

• [ ] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature / Optimization (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist:

• [ ] My change requires a change to the documentation.
• [ ] I have updated the documentation accordingly.

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