add module cleanup
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This reverts commit 7f6d8ace.

* Make topk op support variable k.
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* Fix tensor type.
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* wip

* wip

* wip

* wip for test

* add fp16 tests test=develop

* fix cpu build test=develop

* fix test=develop

* fix py3 tests test=develop

* fix lr_scheduler dtype test=develop

* fix test=dvelop

* test fix ci compile test=develop

* fix build and merge test=develop

* fallback momentumop change to general test=develop

* make fp16 lr schedule simple test=develop

* fix ut test=develop

* fix tests test=develop

* remove fp16 learning rate cast test=develop

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* Init slim.

* Remove distillation demo.

* Fix import errors.
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* Fix some issues.
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* Fix configs.
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* Modify API.spec.
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* Fix format.
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* Fix format.
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* Add some comments.

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* add doc for MergeSelectedRows
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* checkout selected_rows
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This reverts commit 3d750f9c.

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* Add test items for mkldnn conv2d

* Fix the regression issue and pass the unit test for conv2d and conv3d

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* refine parallel_executor

* remove uncessary code
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* wip

* wip

* wip

* wip for test

* add fp16 tests test=develop

* fix cpu build test=develop

* fix test=develop

* fix py3 tests test=develop

* fix lr_scheduler dtype test=develop

* fix test=dvelop

* test fix ci compile test=develop

* fix build and merge test=develop

* fallback momentumop change to general test=develop

* fix utils config, test=develop

* reweite tools in lookup table utils, test=develop

* merge develop, test=develop

* add copy in setup, test=develop

* update api spec, test=develop

* add doc, test=develop

* prettifying doc, test=develop

* Update API.spec

update api.spec, test=develop

* Update lookup_table_utils.py

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* Update lookup_table_utils.py

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* merge develop, test=develop

* merge develop, test=develop

* init fix, test=develop

* fix in downloads, test=develop

* fix in setup.in, test=develop

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* Enable mul operator for a ngraph
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* Enable activation ops test
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* Remove unused line
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* - Added transpose MKLDNN Op
- Few basic UT works
- Added 1D transpose
- implementing generic mem desc for MKLDNN transpose
- Modified trnaspose op to support  more dimensional data eg. 5,6..10
- Added is_test attribute to transpose op

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* - Added support for MKLDNN::memory::format::any for Transpose MKLDNN op

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* - Additional transpose mkldnn op correction to mkldnn layout

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* Cosmetic fixes

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* - Removed const_cast to obey coding standard

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* follow comments. test=develop

* Fix typo

* fix compile error. test=develop

* merge develop branch. test=develop

* Remove set_equal

* Polish code

* Delete unused functions

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* polish code. test=develop

* follow comment

* polish code.

* fix windows compile error. test=develop

* fix op handle.

* rerun ci. test=develop

* rerun ci. test=develop

* rerun macci. test=develop

* polish code. test=develop

* rewrite sort code. test=develop

* remove unused code. test=develop

* fix tests. test=develop

* fix conflict. test=develop

* follow comment. test=develop

* merge develop branch. test=develop

* fix tests. test=develop

* remove ToTypeIndex. test=develop

* rerun ci. test=develop

* test=develop

* fix tests. test=develop

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