squeeze'ing of all singleton dimensions?

[pmeier]

Currently the only valid inputs for the axis parameter of xp.squeeze() are an int or a tuple of them.

Both numpy and PyTorch (I have not looked at the other libraries) support calling squeeze without the axis parameter. In this case all singleton dimensions will be squeezed:

In [1]: import numpy as np
In [2]: a = np.empty((1, 2, 1, 3, 1, 4))
In [3]: a.squeeze().shape
Out[3]: (2, 3, 4)
In [4]: import torch
In [5]: torch.from_numpy(a).squeeze().shape
Out[5]: torch.Size([2, 3, 4])

Maybe we can add this to the spec?

[pmeier]

Oops, #100.