* fix hdfs and fleet_util for supporting save/load infer;test=develop

* enhance error message when x or y is empty in elementwise_op

* format code

* format code

1. check status of remove op grad shell scripts
2. Update paddle_build.bat to remove op grad when build windows inference lib
3. add inference demo test after build finish

* delete useless GELU in gelu npu op

* add description

* fix format

* add check_grad in gelu unittest

* fix safe bug of scatter/scatter_nd

* dygraph sharding

* update unitest hybrid_parallel_communicate_group

* added matmul_v2 bf16/fp32 FWD kernel

added matmul_v2 bf16/fp32 FWD kernel

* added formatting

* removed some tests due to timeout in CI

* refactored tests

* merged tests classes into one file

* minor change

* removed test guard for CUDA

* remove skipIf

* changes after review

* formated one file

* minor change

* added skipping UT in CUDA place

* support set_device for NPU.

* minor update doc and add more unit test.

* fix cpu/gpu check approve

* test=coverage;test=notest

* test=coverage;test=notest

* del

* scale_matmul_fuse_pass_init

* enhance scale_matmul_fuse_pass

* change scale_matmul_fuse_pass unittest

* del py2 code3

* test=notest;test=coverage

* del

* fix

* add retry in pull sparse

* retry

test=develop.

* remove heterbox

* remove heterbox