support the pow operation between two tensors

[L-M-Sherlock]

I find that the tensor could be taken the power by a scalar value:

https://docs.rs/burn/latest/burn/tensor/struct.Tensor.html#method.powf

But I haven't found the method to take the power of a tensor with another tensor, like torch:

https://pytorch.org/docs/stable/generated/torch.pow.html

[Gadersd]

Try result = (power * base.log()).exp(). This is equivalent to base^power.

[L-M-Sherlock]

@Gadersd, thanks for your suggestion! I have another problem. Is there an equivalent to torch.nonzero?

https://pytorch.org/docs/stable/generated/torch.nonzero.html

[nathanielsimard]

I think we should still support the pow operation between two tensors and not force people to use a combination of mul, log and exp.

[L-M-Sherlock]

Is there a plan to support pow operation? If not, I'll close the issue.

[nathanielsimard]

We will support that operation, so we can keep the issue open!

[antimora]

Completed via https://github.com/tracel-ai/burn/pull/748