adds reshaping functions to Images and Series

[jwittenbach]

implements #335 for Series and a corresponding function for Images

[jwittenbach]

@freeman-lab: I want to use this to make the handling of non-2D arrays nice and straight-forward in Thunder Factorization. Seemed general enough to include directly in Thunder. Thoughts?

[freeman-lab]

Cool, seems reasonable, is this the only case where the thunder API directly references keys and values? That's the only thing that concerns me a bit. If we've avoided that so far, might not want to introduce it just for this. Other options, off the top of my head:

• You could call both reshape but it's confusing if they do different things
• You could only add a reshape method to series, because for images you can always do reshaping via a map operation, but that doesn't work for "reshaping" the keys in series data

Other ideas?

[jwittenbach]

Yeah, I also thought about just calling it reshape, but decided it was too confusing. We do mention "values" in a couple of places (e.g. value_shape), but there is no equivalent for "keys", which makes things tricky.

[freeman-lab]

should be self.keys.reshape right?

[freeman-lab]

oh sorry, nevermind, this is correct, i was confused

[jwittenbach]

@freeman-lab updated things to reflect our conversation yesterday...both Images and Series now have a reshape function with a simpler API that just takes the new shape, and then catches invalid reshapes.

[freeman-lab]

Nice @jwittenbach , this looks great! Merging in.