[Numpy-discussion] array comprehension

[Stephan Hoyer]

On Fri, Nov 4, 2016 at 7:12 AM, Francesc Alted <faltet at gmail.com> wrote:

> Does this generalize to >1 dimensions?
>>
>
> A reshape() is not enough?  What do you want to do exactly?
>

np.fromiter takes scalar input and only builds a 1D array. So it actually
can't combine multiple values at once unless they are flattened out in
Python. It could be nice to add support for non-scalar inputs, stacking
them similarly to np.array. Likewise, it could be nice to add an axis
argument, so it can work similarly to np.stack.

More generally, you might want to iterate and rebuild over arbitrary
dimension(s) of an array. Something like
np.stack([x for x in np.unstack(y, axis)], axis)

But, we also don't have an unstack function. This would mostly be syntactic
sugar, but I think it would be a nice addition. Such a function actually
exists in TensorFlow:
https://g3doc.corp.google.com/third_party/tensorflow/g3doc/api_docs/python/array_ops.md?cl=head#unstack
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