* optimize adam speed by removing _finish_update test=develop

* fix SparseAdamFunctor param list test=develop

* Remove scale_op in expect_list of adam_op test=develop

* fix test optimizer loss assert error test=develop

* fix test optimizer loss assert error test=develop

* modify PADDLE_ENFORCE usage test=develop

* fix op_type in lamb_op.cc test=develop

* fix errors ostream format bug test=develop

* add betaPowOut in ngraph op test=develop

* fix ngraph::op api for gcc8 test=develop

* clean code test=develop

* modify struct into class test=develop

* remove code of beta1Tensor in lamb_op test=develop

* update layers, test=develop

* fix input numpy, test=develop

* fix bugs, test=develop

* follow commments, test=develop

* update getitem, test=develop

* add decorator skip_check_grad_ci for test_group_norm test=develop

* remove return in op_test teardown, test=develop
* add check_grad for fp64 and other type
* update white list

* test the equality between running-time and compiling time

* add white_list for compile_vs_runtime check test=develop

* add check of new-registered op on compile&runtime-lodEquality test=develop

* test=develop

* test=develop

* update white-list test=develop

* merge with new code test=develop

* fix code style test=develop

* test=devleop

* test=develop

* test=develop

* test=develop

* add more ops to white_list test=develop

* test=develop

* test=develop

* test=develop

* test=develop

* test=develop

* fix code_style: add comments test=develop

* test=develop

Update iou_similarity op to support non-normalized bbox

test=develop

* add unittests, test=develop

* set dtype of compare op to bool, test=develop

* add selected rows supported in framework

* copy stop_gradient property in clone, test=develop

* fix pruning issue, test=develop

* fix kLookupTablePath issue, test=develop

* sync program, test=develop

* copy subblocks, test=develop

* add unittests, test=develop

* test=develop, speed dense calc & communication

test=develop

* Remove self-set accuracy parameters of op tests: max_relative_error
test=develop

* fix error
test=develop

* Remove self-set accuracy parameters of op tests: max_relative_erro
test=develop

* fix error
test=develop

* add Linear layer
test=develop

* update unittest for coverage
test=develop

* Remove self-set accuracy parameters of op tests:atol
test=develop

* keep smaller parameters
test=develop

* fix error
test=develop

1. Make while_op accept GPU conditional data
2. Add more complex test cases for while_loop API

test=develop

* Remove self-set accuracy parameters of op tests: max_relative_error
test=develop

* fix errors
test=develop

*use dtype to determine whether check_grade is needed, and delete useless class

The fixed bugs:

1. The condition sub-graph is not pruned
2. When backward graph is extremely simple, the whole backward ops are pruned.

test=develop