[scikit-learn] How to not recalculate transformer in a Pipeline?

[Joel Nothman]

But that the issue of model memoising isn't limited to pipeline.

On 29 November 2016 at 18:11, Gael Varoquaux <gael.varoquaux at normalesup.org>
wrote:

> On Tue, Nov 29, 2016 at 10:13:00AM +1100, Joel Nothman wrote:
> >    - We have had PRs #3951
> >    <https://github.com/scikit-learn/scikit-learn/pull/3951> and #2086
> >    <https://github.com/scikit-learn/scikit-learn/pull/2086> that build
> >    memoising into Pipeline in one way or another.
>
> Sorry, I had in mind that this was discussed, but I hadn't realized that
> they were PRs. I think that 3951 is a good start. I would have comments
> on it, but maybe I should make them in the PR.
>
> >    - Andy and I have previously discussed alternative ways to set
> >    parameters to avoid indirection issues created by wrappers.
>
> I feel that these approaches are much more invasive. The nice thing about
> a memoized pipeline is that is a a fairly local change.
>
> I'll comment on 3951 in terms of this specific realization, but we can
> discuss here if we want to take it further.
>
> Gaël
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