[scikit-learn] Terminating a Pipeline with a NearestNeighbors search

[Ryan Conway]

Thank you, Andreas. Indeed this becomes cumbersome when we don't know the
prototype of the terminating function.

> it's pretty easy to implement this by creating your own Pipeline
subclass, isn't it?

Good idea, that's probably the route I will take. That said, as a newcomer
to sklearn, a benefit of utility classes such as Pipeline is that their
interface helps me understand the library developers' intent and how its
components should fit together. Prior to this conversation I lacked
confidence that Pipeline was suitable for my use case.

Ryan

On Wed, Sep 13, 2017 at 2:14 PM, Joel Nothman <joel.nothman at gmail.com>
wrote:

> it's pretty easy to implement this by creating your own Pipeline subclass,
> isn't it?
>
> On 14 Sep 2017 4:55 am, "Gael Varoquaux" <gael.varoquaux at normalesup.org>
> wrote:
>
>> On Wed, Sep 13, 2017 at 02:45:41PM -0400, Andreas Mueller wrote:
>> > We could add a way to call non-standard methods, but I'm not sure that
>> is the
>> > right way to go.
>> > (like pipeline.custom_method(X, method="kneighbors")). But that assumes
>> that
>> > the method signature is X or (X, y).
>> > So I'm not sure if this is generally useful.
>>
>> I don't see either why it's useful. We shouldn't add a method for
>> everything that can be easily coded with a few lines of Python. The nice
>> thing of Python is that it is such an expressive language.
>>
>> Gaël
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