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* resolve #15618
Backgroud: the PR #15398 raised the box_coder op performance regression, we optimized the code via the more efficency leveraging opemmp.

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* remove concast_cast and refactor code test=develop

* reduce flag use test=develop

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* Revert "Revert "Add Event for TensorCopy" (#16022)"

This reverts commit e2da3a5b.

* use default stream
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Make parent_idx a dispensable output for beam_search op to support models saved by older paddle version. (#16106)

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1). add static trt load model
2). fix bug: when device_id is not 0, the trt will have a bug
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add simple static mode loading
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1. bind trt input and output to fluid tensors

Make parent_idx a dispensable output for beam_search op to support models saved by older paddle version. (#16106)

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- Support setting attr in config
- Support setting dtype and initializer for input in config
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* polish the cast op doc

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* follow comments

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* fix api.spec

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- Support setting attr in config
- Support setting dtype and initializer for input in config
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* polish the cast op doc

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* follow comments

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* fix api.spec

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* Enable INT8 ReQuantize OP
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* Clean code
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* Add comments
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* Revert "Clean code"
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This reverts commit a7a49b8aa214f9730cb84e11ea96da564fe4b4d9.

* Modify requantize op test
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* fix requantize UT by moving public function to public test file.
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* Fix test fail due to file address change.
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* Change file address for requantize op.
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* refine recurrent_op
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* remove unnecessary code
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