* Add cast between int64 tensor and Paddle-TRT
* Add Unit testing.

* replace cross_entropy in python/paddle/fluid/tests/unittests/test_[o-z]*.py plus test_dist_transpiler.py

* fix test_prune

* support custom_xpu

* update cmake to test xpu

* support custom_xpu, verify mechanism

* fix test_custom_relu_op_xpu_setup.py, test=kunlun

* fix FLAGS_init_allocated_mem

* cancel TIMEOUT property

* reset FLAGS_init_allocated_mem property

[fluid remove]: remove paddle.fluid.layers.box_coder and paddle.fluid.layers.polygon_box_transform (#48896)

* remove fluid_box_coder and polygon_box_transform

* code check

* add prelu

* mv fused_bias_dropout_residual_ln to fluid manual dir

* rm useless comments

replace cross_entropy except in python/paddle/fluid/tests/unittests/*.py && unittests/*/*.py (#48922)

replace cross_entropy in python/paddle/fluid/tests/unittests/test_[a-n]*.py except test_dist_transpiler.py (#48913)

* rm distribution uniform eager guard test

* review

[fluid remove]: remove paddle.fluid.layers.detection_map, paddle.fluid.metrics.DetectionMAP and paddle.fluid.evaluator.DetectionMAP (#48674)

* remove paddle.fluid.layers.nn.temporal_shift

* code check

* rm unittest

* remove paddle.fluid.layers.detection_map and the class:DetectionMAP

* remove pool2d

* add cluster_partition and device_meshes to process_meshes funcs

* add unitest

* fix 'BlasAXPBY unimplemented' error with custom device

* fix utils CmakeLists bug

* replace fluid.layers.matmul in fluid/io.py

* fix doc error in fluid.layers.nn.sampling_id

* replace layers.cross_entropy with paddle.entropy

* fix args

* fix codestyle

* [remove fluid] under unittesets of linear api

* [remove fluid] under unittesets of linear api

* [remove fluid] under unittesets of linear api

* [remove fluid] under unittesets of linear api

* [remove fluid] under unittesets of linear api

* [remove fluid] under unittesets of linear api

* [remove fluid] fluid dygrapn linear api

* [remove fluid] fluid dygrapn linear api

* [remove fluid] fluid dygrapn linear api

* rm dygraph_to_static eager guard tests part2 minst2ptb_lm

[Fluid Clean] remove unfold, deformable_roi_pooling, shard_index, hard_swish, mish, uniform_random, unbind (#48451)