* fix broadcast with mp mode

* polish code test=develop

* fix bcast strategy test=develop

* fic cpplint test=develop

* fix py3 failed test=develop

* fix comment test=develop

* update comment test=develop

* remove concast_cast and refactor code test=develop

* reduce flag use test=develop

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* Remove Desc in Forward Pass

* Refactor VarBase

* Add dbg info

* Only check type in imperative mode

* Polish code and support optimizer

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* Fix stop gradient problem in PyLayer

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

This reverts commit e2da3a5b.

* use default stream
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* fix recordio on win
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* test=develop

* test=develop

* fix code style
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* test=develop

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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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* Fix the node's sort issue when the graph is changed.

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* Clean code

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add if use static engine for trt
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update trt in  docker file
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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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* Fix the node's sort issue when the graph is changed.

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* Clean code

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add if use static engine for trt
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- Support setting attr in config
- Support setting dtype and initializer for input in config
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