Fix/reduce op

* Adding greater than and less than equal ops to compare op
* Changing the name of the less_than_equal and greater_than_equal op
* Also changing the name of the functors

Remove some code to reduce the size of the mobile inference library.

fix pooling functor parameter order

Add dilation for exconv layer

max pool Layer with mask

* init commit

* change some dir name

Fix error in  networks' docstrings . 

* fix lod_tensor_array

* init test beam search decode op

* add test_beam_search_decode_op

Add Lod Reset Operator

* Conditional Block Forward

* Assign Operator.

Out=X, when type in [LoDTensor/SelectedRows/LoDTensorArray]

* Stash

* Add Scope::Rename

it is useful in gradient phase of an operator with block

* ConditionalBlock Grad Done

* Add comments

* yapf format code

* add split lod tensor operator

* add more test cast

* clean code

* add merge lod tensor operator

* fix bug

* clean code

* add grad operator

* make mask support GPU

* add comments

* Assign Operator.

Out=X, when type in [LoDTensor/SelectedRows/LoDTensorArray]

* Follow comments

Move the tests of book chapters from test/ into tests/book

Add Bilinear Tensor Product operator.

Fix sequence_pool_op in debug mode

Fix matmal_op for debug mode

The rank of the tensor from the chip() function is changed. In release mode, eigen_assert is not enabled and the dimenstion mismatch is not detected.

The dimension is not set correctly and is not being checked in release mode because eigen_assert is not enabled.

fix compile warning in test_MKLDNN.cpp and ROIPoolLayer.cpp