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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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* 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

* Avoid calling VLOG() when program exiting
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* Avoid calling VLOG() when program exiting
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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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make the code unreadable and make the program unstable.

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2. Seperate the lock of kids and vars in Scope

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