# Use tensor.mean() method but ignore 0 values

I was calling `nonzero()` on a tensor and then getting the mean values, but it turns out that I will need to keep the shape of the original tensor, but just ignore the values that are 0 for the mean calculation, is there a way to do this?

I donâ€™t understand what do you mean by â€śkeep the shapeâ€¦â€ť. A mean is an scalar, thus, you canâ€™t â€śkeep the shapeâ€ť.

You just can filter them out like mean = tensor[tensor !=0].mean()

right, but the original tensor has a shape and I need to preserve the shape which would exist if I were to doâ€¦

``````x = torch.ones((2, 3, 4))
x.mean(dim=0)
``````

which would be a `(3,4)` tensor of the means along dimension 0. I have found that I could do this by summing the elements along the dimension and then somehow dividing by the count of nonzero elements along the same dimensionâ€¦

But then I realized my problem is a little bit harder than that because I am dealing with one tensor of values and then one probability distribution tensor with the same shape, which gives the probabilities of those valuesâ€¦

``````x = torch.rand((2, 3, 4))
y = torch.distributions.Normal(torch.randn((2, 3, 4), torch.randn((2, 3, 4)))
pr = y.log_prob(x)
...
``````

at this point I need to get the mean of dimension 0 of the values in y which are 0 in `x` but they are not 0 in `y` because of the `log_prob` callâ€¦ very confusing about how to go about it

If I got it you has a tensor (N,M,P)

``````mask = x!=0
You could use `.nonzero()` but just reshape back to the original dimensions
`x[x.nonzero(as_tuple=True)].view(-1, x.shape[1])`
and then do `torch.mean()` as normal