* resolve #17184

Fix the KL algorithm bug when calculated the size of tensor.

* Add the missing test=develop.

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* Update Readme with new accuracy and performance data measured on 6271
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* Modify tables and example command
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1.Remove the code for setting mkldnn environment in the test_calibration.py;
2.Update the cmake file for MKLDNN environment enabling;
3.Update the INT8 inference doc.

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* Add calibration README; test=develop

* Add INT8 calibration support in Paddle package; test=develop

* Add the calibration tool code for int8 inference and focus test.

* Fix the calibration tool per the review comments.

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* Update the calibrator doc and remove extra line.

* Fix the invalid is_negative_input attr set on Mobilenet.

* Add the comments and fix the format issue.

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* Update the CMakelist.txt for Calibration PR.Disable the Calibration UT if not enable MKLDNN.

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* Update the CMakeList.txt.

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* Disable the test_calibration case on WIN and MAC.

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* Add the missing brackets.

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* Remove the outdated map operator which not supported on Python3.

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* Fix the style issue.

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* 1.Update the CMakeList.txt to disable calibration tool ut when the WITH_MKL is not set;
2.Add the workaround to enable the FLAGS_use_mkldnn for PR_CI(PADDLE).

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* Fix the typo and format the License header.

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* 1.Add and Update TODOs per review comments.
2.Code clean.

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