Adding copyto function to Dask Array

[jakirkham]

It would be useful to add the copyto function to Dask Array. This would help when smoothing over the differences between various array-like libraries where copying contents from one array to another would be needed.

Not entirely sure what the implementation would look like, but at a first pass it might be replacing the graph inside the dst object with the one from the src object. Though there may be other needs to consider here. The implementation may need to evolve over time as well.

Some relevant discussion in issue ( numpy/numpy#13831 ).

cc @pentschev

[jsignell]

This functionality now exists with asarrray right?

[jakirkham]

@pentschev do we still have a need for this? My guess is no, but please correct me if it is needed 🙂

[pentschev]

At this time, I can't really think of a need for copyto, probably the like= argument has resolved our need. For now I'd say it's safe to close this and we can reopen should we find a use for that in the future.