I need to select a “view” of a Tensor, and assigning other values to it.

In NumPy I do something like this:

```
ar = np.random.rand(2, 3, 5)
xs = np.array([0, 1, 0, 0, 1])
ys = np.array([0, 1, 2, 3, 4])
res = np.random.rand(5,3)
ar[xs, :, ys] = res
```

The fancy indexing views the array ar, selecting a subset of size (5,3), then I insert into it the res values.

How can I do the same thing in pytorch. More in general how do I perform fancy indexing in Pytorch?

I have taken a look to the gather, select_index, and scatter_ functions, but none of them seems to work for this example.