Parallelize ApplyByCols and ApplyToRows

[marcglobality]

First of all, thanks for this amazing library, really useful. Now going to the issue / request:

It seems to me that ApplyByCols and ApplyToRows could have a parameter to make them run in parallel. Has this ever been considered as a feature? I think it could speed up pipelines quite a lot, esp. useful for big dataframes. WDYT?

---- Edit by @shaypal5 : added in v0.0.67 -----
Also, I see that pipeline.fit and pipeline.transform have the timed bool. Would it be possible to add the same for apply? I know I can do pipeline.transform(...., time=True), but don't see a reason why apply cannot have it

[shaypal5]

1. Hmm. Never considered this. I will definitely accept PRs around parallelization! :)
2. Definitely. Perhaps it was just an oversight. This should be an easy PR to make. Perhaps you can write it?

Also, would you mind separating this into two distinct issues?
The first one is complex, while the other I can label with the first good issue label. :)

[yarkhinephyo]

Hi! I would like to make a new issue for the No.2 and work on it if its okay :)

[shaypal5]

Yeah, definitely! Go fo it and let me know how it goes! :)