Issue: 1916 UserWarning: This overload of nonzero is deprecated: (Solved)

[meetgandhi123]

The warning was because of the PyTorch function nonzero. This warning can be removed by adding the as_tuple argument in the function.

In the Detectron2/layers/wrappers.py:

"return x.nonzero().unbind(1)" needs to be replaced by
"return torch.nonzero(x, as_tuple=True)"

And in the file Detectron2/modeling/roi_heads/fast_rcnn.py:

"filter_inds = filter_mask.nonzero()" needs to be replaced by
"filter_inds=torch.nonzero(filter_mask, as_tuple=False)"

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[ppwwyyxx]

It breaks the test due to pytorch/pytorch#38718.
Maybe you can workaround it with some if is_scripting check.

[john2020-210]

The warning was because of the PyTorch function nonzero. This warning can be removed by adding the as_tuple argument in the function.

In the Detectron2/layers/wrappers.py:

"return x.nonzero().unbind(1)" needs to be replaced by
"return torch.nonzero(x, as_tuple=True)"

And in the file Detectron2/modeling/roi_heads/fast_rcnn.py:

"filter_inds = filter_mask.nonzero()" needs to be replaced by
"filter_inds=torch.nonzero(filter_mask, as_tuple=False)"

Thank you for your answer ,I have solved the problem flowing your answer!

[Francis0625]

The same UserWarning in detectron2/structures/masks.py
PYTORCH1.6

/Home/detectron2/detectron2/structures/masks.py:348: UserWarning: This overload of nonzero is deprecated:
nonzero()
Consider using one of the following signatures instead:
nonzero(*, bool as_tuple) (Triggered internally at /pytorch/torch/csrc/utils/python_arg_parser.cpp:766.)
item = item.nonzero().squeeze(1).cpu().numpy().tolist()

Solution:
item = item.nonzero(as_tuple=True).squeeze(1).cpu().numpy().tolist()