* remove hard_sigmoid in nn.py under fluid

* fix hardsigmoid test case

* fix hardsigmoid test case

* remove reshape in nn.py under fluid

* remove reshape reference

* fix test case

* fix test case in distribution.uniform

* remove fluid reshape reference

[CodeStyle][py2][py311] replace deprecated `inspect.getargspec` with `inspect.getfullargspec` (#48218)

* [CodeStyle][py2] use inspect.getfullargspect instead of deprecated inspect.getargspec

* refactor to f-string

[CodeStyle][py36-][E722] remove import handling for collections.abc in different python versions (#48165)

paddle.scatter_nd_add

* remove apis in fluid.ops

* fix test_activation_nn_grad

* fix circle import error

* fix ops

* fix cos

* fix divide not inplace

* remove lazy-import part

remove crop which is not used in Paddle 2.0

* remove relu6 test case under fluid

* fix relu6 test case in mkldnn_elt_act_fuse_pass

replace paddle.fluid.layers.selu with paddle.nn.functional.selu

* Remove API: gather
	replace the paddle.fluid.layers.gather with paddle.gather

* modify the call of gather from old style to new style

* remove range

remove pad_constant_like which is not used in paddle 2.0

* remove unstack in nn.py under fluid

* remove unstack under fluid

* clean fluid elementwise_pow, remove API

* clean elem_pow doc

* clean elementwise_mod

* clean elementwise min, floordiv, mod

* remove swish in nn.py under fluid

* fix tswish test case

* clean fluid elementwise_min

* fix elementwise_min op testcase

* remove chunk_eval

* [Zero-Dim] support input 0D Tensor as scalar attribute for some api

* fix doc

* standard api

* fix sparse bugs

* fix xpu bugs, test=kunlun

* remove hard code for custom unittest

* open ci, test=kunlun

* deal with conflict

* [Zero-Dim] support input 0D Tensor for sundary api

* fix comment

* [CodeStyle][py2][U004] unecessary explicit `object` inheritance in class definition

* fix an increment

* move fluid.layers.deformable_conv to static.nn

* modify example code

* fix doc

* Update common.py
Co-authored-by: NLigoml <39876205+Ligoml@users.noreply.github.com>

* [CodeStyle][py2][U008] remove unnecessary args in `super()`

* remove remained args

* revert changes in test_pylayer_op

* Revert "revert changes in test_pylayer_op"

This reverts commit ff185a9ae738afac3b0264f61bde6c6b7f72e7c4.

* revert some changes in example code

* [CodeStyle][E711] use `is`/`is not` for comparison with `None`

* `self.assertTrue($A is None)` -> `self.assertIsNone($A)`

* `self.assertTrue($A is not None)` -> `self.assertIsNotNone($A)`

* `self.assertFalse($A is None)` -> `self.assertIsNotNone($A)`

* `self.assertEqual($A, None)` -> `self.assertIsNone($A)`

* `self.assertNotEqual($A, None)` -> `self.assertIsNotNone($A)`