Zhongjin Luo
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Zhongjin Luo
As is explained in the [tensorflow document](https://www.tensorflow.org/api_docs/python/tf/gather_nd)：Note that on CPU, if an out of bound index is found, an error is returned. On GPU, if an out of bound index...
Maybe you can try: `grad_tensor = torch.autograd.grad(outputs=sdf, inputs=points_batch, grad_outputs=torch.ones_like(points_batch), create_graph=True, retain_graph=True)` to `grad_tensor = torch.autograd.grad(outputs=sdf, inputs=points_batch, grad_outputs=torch.ones_like(sdf), create_graph=True, retain_graph=True)`