* fix python/paddle/fluid/__init__.py detecting problems

* Detailed coordinate description for yolov3 loss

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* modified api.spec

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* modified loss name

* fix api.spec

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* polish description

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* modified api.spec

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backward of backward: leaky_relu

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Speedup roi_perspective_transform op by caching the information of linear interpolation in forward (#17090)

* Cache the information of linear interpolation in forward and use it in backward.
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* Fix cuda kernel.
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* Init mixed precision training interface

* Add fp16 test script

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* All initializers support float16

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* Code cleanup & add more code annotations

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* Update API spec

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* Add usage example in doc

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implement dygraph.parallel.DataParallel to hook reduce op.

1. specify the cuda arch name and bin to decrease the compile time for inference test=develop
2. simplify the script and add comments
3. remove the fluid process from cicheck

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* Add fuse momenutum ops

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* make_conv_cudnn_ws_size_configurable, test=develop

* change std::max to std::min
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Support backward of backward for Relu and add a new gradient checker by comparing theoretical and numerical Jacobian. (#16862)

* Support backward of backward and a new gradient checker
* Rename decorators.py to decorator_helper.py, since Python on Windows CI has decorators package.

1. Add ReluDoubleGradMaker when register relu_grad.
2. Add a new gradient checker by comparing theoretical and numerical Jacobian.  Check double gradients by double_grad_check.

* fix cmakelist detecting problems

* add doc for memory_optimize, test=develop

* update doc, test=develop

* doc update, test=develop

* add parallel build script to ci test=develop
* 1. classify the test case as single card/two cards/multiple cards type
   2. run test case according to the run type

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* Speed affine_channel_op unit testing
* Add check in tensor_py
* Fix ONLY_CPU Compiling

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* speedup gc and inplace softmax_with_cross_entropy_grad
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* refine models gpu mem
Merge skip vars and warning messages of mem opt
remove relu mem opt
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* follow comments
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* Support seq len equal to 0 in sequence ops

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* Add more test cases

* Fix some comments

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* Fix py3 error

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* Check some shapes only in runtime

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* Follow review comments

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* Update API spec

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* fix cmakelist detecting problems

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* test=develop

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* fix sampling id op bug, test=develop

* fix overflow by int32 mul test=develop

* fix reference nullptr

* fix codestyle test=develop

* modify to point in ContextProjectFunctor test=develop

* modify to point in ContextProjectFunctor test=develop

* modify . to -> test=develop

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