Implement Observer pass on simple model and validate stats (#18848)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/18848
The Observer Module is based on eager mode compute qparam implementation.
Goal is to validate QParam result for EagerMode and Script Mode for simple
model
Observer stats are collected and qparam computed only for activations only at this point
Reviewed By: zafartahirov
Differential Revision: D14720805
fbshipit-source-id: cb2f321b4b9927b37905fdb8eb55c5610d41b351
