* wip simplify operator framework

* wip

* wip

* done test=develop

* clean test=develop

* fix test=develop

* fix deps test=develop

* fix cpu build test=develop

* fix tensorrt build test=develop

* fix tests test=develop

* fix test=develop

* fix cpu build test=develop

* Fix truncated normal.

* Fix.

* Make nce support more distribution.

* Fix API.spec.

* Fix python API.

* Fix.
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* Fix API.spec
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* Fix sampler.

* Fix order of arguments in python API.
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* add cudnn ctc loss

* wip add test test=develop

* wip

* wip

* done test=develop

* move include cudnn test=develop

* test test=develop

* fix build test=develop

* fix build test=develop

* fix build on cudnn5 test=develop

* fix cudnn5 build test=develop

* fix cudnn5 build test=develop

* merge develop softmax functor change test=develop

test=develop

* add lod tensor array concat

* add lod tensor array concat

* test=develop

* add lod tensor array concat
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* Fix API.spec
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* add lod tensor array concat
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* revise some bug of lod tensor array concat
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* add unittest for tensor array concat
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* change to tensor array to tensor
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* revise bug
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* revise a bug
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* revise a bug
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* revise a bug of python3
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* fix input<tensor>
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* fix split_ids
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* ElementwiseMul should not support SelectedRows

* fix scale op
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* change GetTensorFromVar() method to GetTensorOrSelectedRowsFromVar()

* fix operator

* refine MultiOutput

* fix MultiOutput
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* disable test_dist_save_load
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* fix elementwise_op
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* add get_sparse_as_op
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* add info for check
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* rename get_sparse_as_op with extract_rows_as_op.
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* elementwise doesn't support selected_rows

* fix regularizer

* remove extract_rows_as
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* fix ci
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* add test for sum_op

* fix regularizer
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*  test=develop

* fix pserver weight decay multi inputs test=develop

* speedup split_op
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* speedup split_op
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* rename ConcatGrad to Split

* refine concat and split
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* fix compile error

* Add affine channel op.
* Update code and add Python API.
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* Update API.spec
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* "fix compile error"

* "fix ci"

* rerun ci
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* test=develop

rerun ci

* refine reduce by cub
* optimize KernelDepthwiseConvFilterGrad
* optimize depthwise conv and reduce mean and reduce sum
* fix bug: dilation
* cuda arch and cuda 8 compatible

test=develop

* refine seq_softmax_op

* fix seq_softmax

* use cub in seq_softmax

* Improve and fix fake_quantize_op.