Hi, all

How to set ‘nan’ in Tensor to 0? Now I have a extremely inefficient method:

```
my_tensor_np = my_tensor.cpu().numpy()
my_tensor_np [np.isnan(my_tensor_np )] = 0
my_tensor.copy_(torch.from_numpy(my_tensor_np ).cuda())
```

But copy tensor between gpu and cpu takes lots of time, so I need a more efficient way.

Anyone can help me? Thanks a lot!