* modify roi pool with lod and expose ROI Pooling into Python API

* make lod code brief

* make doc more clearly

* make doc more clearly

* Some changes for Adam profiling

* Adam optimization: initial Eigen optimization

* Eigen Adam: flavour of adam can be chosen

* Eigen Adam used for CPU by default. Plain Adam used for GPU

* Eigen Adam: missing call to the Eigen functor added

* Eigen Adam: revert changes in benchmarks

* Eigen Adam: typo corrected

* add float16 transpiler

* fix feed fetch target names mismatch

* fix cast op input change issue

* fix program desc flush error

* fix inconsistent var names in block desc bug

* code clean up

* add float16 infernce C++ example and fix prune bug

* Fix CPPLint issue in test_engine

* Fix CPPLint errors in operators/math

* Fix compilation

* Fix more CPPLint issues

* Fix more CPPLint issues

* Fix more CPPLint issues

* Fix CPPLint issues in operators/math and operators/reader

stride should be int64_t, not int

* delete unused IsNetOp() and Rename()

* rm OperatorBase::Rename implementation

* delete Operator::InputVars()

* remove unused OperatorBase::ShareLoD; ShareLoD has been implemented in infershape

* organize operatorbase; remove unused set_type

* add comments

* fix comment

* Fic CPPLint issues with data_transform

* Fic CPPLint issues with prune.cc

* remove share lod; it has already been performed in infershape

* slightly release test bound of test_image_classification

* fix

* nv_library

* add with_gpu

* revert