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Refine INT8 calibration API

move ngraph_bridge to ngraph directory 

test=develop

Add Shuffle Channel Operator

jit benchmark use tensor with alignment

Optimize cpp reader

* fix mistakes in merge_ids, test=develop

Add check: conv_fusion op runs with cudnn version > 7100 .

* enable ngraph_engine_op
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* merge develop test=develop

* avoid const_cast test=develop

* rm ngraph_operator test=develop

* Added TODO to move EnableNgraph test=develop

* Add TODO to remove const_cast test=develop

test=develop

* Revert "set constant for loss"

This reverts commit 167933f6.

* Revert "remove workspace_handle"
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This reverts commit b4aca8ed.

test=develop

* Refine the beam_search op and test.

* A basic CUDA implementation of beam_search for small batch_size.

* Implement CUDA kernel for beam_search_op.

* Use multiple CUDA threads in the same block to select the top beam.

* Update the python api of beam_search op.

* Enable extend function in CPU kernel of beam_search op.

* Unify the CUDA codes.
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* Unify the CPU kernel of beam_search op.

* Ensure the seletced items of beam_search_op's CPU kernel sorted by scores.

* Update the description of beam_search in API.spec.

* Enable the use of CUDA kernel in beam_search op.

* Exclude the beam_search's CUDA unittest when there is no CUDA gpu, and delete some debuging statements.
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* Follow comments.
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* Call the CPU kernel for beam_search op when batch_size > 4.
test=develop

* Remove the except of is_empty op in PrepareData.
test=develop

Disable eager deletion unittest temporarily since random failure.

Fix bug when user set CUDA_VISIBLE_DEVICES be empty and run CPU-only models

Turn on remove_unnecessary_lock by default

test=develop

* nce add check sample lables, test=develop

test=develop

Add check for it.
test=develop

fix debug compile issue of analysis pass

* fix github issue 15267 test=develop

* fix github issue 15267 test=develop

* monitor the GPU usage during runtime

* revert allocator_facade.cc change

* comments update test=develop

Imperative Resnet

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Optimize assign