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unspecified launch failure #2567

Description

@zhanghang1989

I keep having this error during the training using recent pytorch version. It was okay before.
Code:

        result = comm.reduce_add(inputs)
        results = []
        for i in range(len(inputs)):
            results.append(result.cuda(i))

Error:

  File "/home/ubuntu/anaconda3/lib/python3.6/site-packages/torch/_utils.py", line 66, in _cuda
    return new_type(self.size()).copy_(self, async)
RuntimeError: cuda runtime error (4) : unspecified launch failure at /home/ubuntu/pytorch/torch/lib/THC/THCTensorCopy.cu:85
terminate called after throwing an instance of 'std::runtime_error'
  what():  cuda runtime error (4) : unspecified launch failure at /home/ubuntu/pytorch/torch/lib/THC/generic/THCStorage.c:182

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