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grid_sampler_2d_backward is not implemented #25

Description

@Louvivien

Hello when running the training i have this error:

Traceback (most recent call last):
  File "/content/stylegan2-ada-pytorch/train.py", line 538, in <module>
    main() # pylint: disable=no-value-for-parameter
  File "/usr/local/lib/python3.10/dist-packages/click/core.py", line 1130, in __call__
    return self.main(*args, **kwargs)
  File "/usr/local/lib/python3.10/dist-packages/click/core.py", line 1055, in main
    rv = self.invoke(ctx)
  File "/usr/local/lib/python3.10/dist-packages/click/core.py", line 1404, in invoke
    return ctx.invoke(self.callback, **ctx.params)
  File "/usr/local/lib/python3.10/dist-packages/click/core.py", line 760, in invoke
    return __callback(*args, **kwargs)
  File "/usr/local/lib/python3.10/dist-packages/click/decorators.py", line 26, in new_func
    return f(get_current_context(), *args, **kwargs)
  File "/content/stylegan2-ada-pytorch/train.py", line 531, in main
    subprocess_fn(rank=0, args=args, temp_dir=temp_dir)
  File "/content/stylegan2-ada-pytorch/train.py", line 383, in subprocess_fn
    training_loop.training_loop(rank=rank, **args)
  File "/content/stylegan2-ada-pytorch/training/training_loop.py", line 284, in training_loop
    loss.accumulate_gradients(phase=phase.name, real_img=real_img, real_c=real_c, gen_z=gen_z, gen_c=gen_c, sync=sync, gain=gain)
  File "/content/stylegan2-ada-pytorch/training/loss.py", line 131, in accumulate_gradients
    (real_logits * 0 + loss_Dreal + loss_Dr1).mean().mul(gain).backward()
  File "/usr/local/lib/python3.10/dist-packages/torch/_tensor.py", line 487, in backward
    torch.autograd.backward(
  File "/usr/local/lib/python3.10/dist-packages/torch/autograd/__init__.py", line 200, in backward
    Variable._execution_engine.run_backward(  # Calls into the C++ engine to run the backward pass
RuntimeError: derivative for aten::grid_sampler_2d_backward is not implemented

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