Segfault on trivial transpose

[arogozhnikov]

System information
-PaddlePaddle version 2.1.1
-CPU: including CPUMKL/OpenBlas/MKLDNN version
-GPU: not used
-OS Platform and Distribution: Mac OS 10.15
-Python version: 3.9.0
Note: You can get most of the information by running summary_env.py.

To Reproduce
See code below. Paddlepaddle doesn't handle zero-dimensional tensors (same issue as in mxnet v1, now fixed)

Describe your current behavior

Code segfaults.

[1]    71657 segmentation fault  ipython

Code to reproduce the issue

import paddle

paddle.zeros([]).transpose([]) # should return 0-dimensional tensor with 1 element, basically transpose should do nothing

paddle.zeros([]).reshape([]) # should return 0-dimensional tensor with 1 element, basically reshape should do nothing

Other info / logs

Support for zero-dimensional tensor is a hard requirement for inclusion for einops support.

Currently paddlepaddle can't pass the tests due to this issue

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[joey12300]

@arogozhnikov thanks for providing details about processing zero-dimensional tensor in transpose (reshape). We will upgrade the ability of processing zero-dimensional tensor in future. :)

[IcarusWizard]

Hi, @joey12300. I am also very interested in intergrade paddle to einops. paddle.zeros([]).transpose([]) seems fixed in paddlepaddle==2.2.0, but paddle.zeros([]).reshape([]) still get error:

ValueError: (InvalidArgument) The parameter 'shape' in ReshapeOp must be set. But received 'shape' is empty.
  [Hint: Expected !shape.empty() == true, but received !shape.empty():0 != true:1.] (at /paddle/paddle/fluid/operators/reshape_op.cc:135)
  [operator < reshape2 > error]

[luotao1]

@IcarusWizard

I am also very interested in intergrade paddle to einops.

Thanks very much for your interest. We try to intergrade paddle to einops in arogozhnikov/einops#122 by @jm12138 before, but since paddle doesn't support zero-dimensional tensor, this PR could not pass the einops CI.

@zhouwei25 is doing zero-dimensional tensor related work now. Since it may cause incompatibility, related work is still under discussion and pending review. #45627 (comment)

[zhwesky2010]

@arogozhnikov Thanks for asking questions. Plan 0D tensor has passed the Internal review and is under development. We will support transpose and reshape 0D before 2022/10/20

[zhwesky2010]

@arogozhnikov Thanks, Are you interested in supporting paddle as the backend for einops, we have fixed the prolem mentioned above in #46555 . And are there any other problem?