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* fpgm pruner pytorch and tensorflow 2.0 implementation

api refactor for compression, especially, quantization APIs

# docstr/pylint of GP Tuner & CurveFitting Assessor & MedianStop Assessor

* trial docstring

* update docstring of batchtuner

* update docstring of batch tuner

* update docstring of evolution tuner

* update docstring and pylint of metis_tuner

* fix pylint related to logger in metis_tuner

* fix pylint

* update

* fix pylint in metis_tuner

* update in networkmorphsim_tuner

* update

* update

* update docstring in hyperopt_tuner

* update batch_tuner

* delete unused space

* update in metis

* update sdk_reference.rst

* update netowrkmorhism

* update networkmorphsim

* update batch_tuner

* update batch_tuner

* update

* update metis

* roll back to print

* update Returns

* update

* delete white space

Fix pylint errors

* Add comprehensive tests for tuners (#1570)

* refactor

* fix compressor op_types

Update python sdk and nni_annotation to pass pylint rules

* fix builtin pruners bug

* use type_as

* fix pruner bugs and add model compression README

* fix example bugs

* add AutoCompression.md and remove sensitive pruner

* fix tf pruner bugs

* update overview

* Pruner.md

* fix builtin pruners bug

* Resolve comments in PR 1571

* try to pass ut

* fix typo

* format doc-string

* use tensorflow.compat.v1

* Revert "use tensorflow.compat.v1"

This reverts commit 97a4ed923677c6dfd545fd654c55c424cf490a19.

* fix gp tuner

* [Proposal] demo compressor (#1402)

model compression

* update doc for model compression (#1509)

* Update Overview.md

* Change Doc (#1510)

* refactor compression sdk (#1562)

* refactor compression sdk

* bugfix

* bugfix

* update ut

* Sync model compression doc and implementation (#1575)

* update doc

* formatting

* bugfix

* add import to examples

Add example for customized advisor and some refactoring

* support specifying gpu for tuner and advisor

* add doc & err catch for gp-tuner: support only numerical values

* PPO tuner for NAS, supports NNI's NAS interface (#1380)

* Fix multiphase issue with gridsearch tuner and batch tuner

* Refactor `receive_customized_trial_result` API

* add doc

* squash commits in v1.0 first round bug bash

* support quniform in smac with "ordinal" in original smac

* use same pattern of quniform/randint as other tuners

Implement lower bound and clarify docs for randint (#1435)

* fix bug for duplicated final results

* dev oneshot and darts mode, add mnist example