* fix -Wno-error=sign-compare warning in gcc8

test=develop

* fix warning in distributed codes

test=develop

* add ut for comparing FP32 and QAT INT8

* add save qat transformed model python script
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* updated

* added missing file

* add "with_label"
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* performance benchmark as unit test
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* change names of unnecessary thing

* Change CMakeList.txt for model downloading and UT
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* change names of functions and params for more readable code
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* Change PADDLE_ENFORCE messages
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* fix indent problems
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* indent problems
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* Add relative error measure when value > 1
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* Move code to CheckError function
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zerocopytensor support uint8, analysis config support profile, analysis predictor support GetInputTensorShape, test=develop (#19822)

* add local user data conversion into full_pascalvoc_test_preprocess.py
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* change PADDLE_ENFORCE to PADDLE_ENFORCE_GE
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* change according to reviews
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* change the top1 comparison to mAP comparison
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* change the mobilenet-ssd tester demo data and batch_size settings
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* fix issue 18111;test=develop

* fix timer;test=develop

* refine code;test=develop

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added printing data type to differentiate int8 and fp32 latency results

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* fix bn fuse vardesc and add model saver

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* unify save model in test helper

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* fix mkdir on windows

test=develop

* remove magic number use bn bias var desc

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* Simplify the compare op for CPU.

* Use asynchronous tensor copy in reshape_op's kernel.

* Optimize while_op for test, avoiding creating variables every time.
test=develop

* Enable the cache of kernel type and kernel function.
test=develop

* Enable profiling with gperftools.

* Remove flags for testing, and fix the linking error.
test=develop

* Delete the codes of ChooseKernel.
test=develop

* Fix bug when preparing ExecutorPrepareContext for while_op.

* Fix missing depending on grpc libraries.

* Remove the redundant print.
test=develop

* Follow comments.

* Remove the codes related to prepare the ExecutorPrepareContext for while_op.
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