[ENH] Added useful attributes to extracted shapelets for RDST

[IRKnyazev]

Reference Issues/PRs

Fixes #1950

What does this implement/fix? Explain your changes.

Added a list of starting points & class values for the transformer's extracted shapelets.

Does your contribution introduce a new dependency? If yes, which one?

No.

Any other comments?

I'm pretty sure this introduction doesn't harm any functionality across the module. I searched for all uses of RDST and checked for calls to RDSTClassifier.transformer.shapelets

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[baraline]

LGTM thanks ! Would be nice to have start index for all shapelets to visualize the generation process at some point

[IRKnyazev]

I can't seem to figure out how the error relates to the code I have added

[Moonzyyy]

I dmed you about the issue, someone else had it previously and it seems its just a random chance to pass it or not. Worth raising it as an issue. Haven't looked at the algorithm myself yet but id assume it most likely needs to have set a seed.

[baraline]

Just noting that there will be an impact on #1949 when this goes though, is it ready for review now ?

[IRKnyazev]

Just noting that there will be an impact on #1949 when this goes though, is it ready for review now ?

yes please!

[baraline]

I'm fine with the addition of classes, although it might not be obvious to use. For example, consider a shapelet extracted from class 0. It might be more discriminative toward class 2 due to the absence of a common pattern present in class 0 and 1 for example.
But this is not the concern of this PR, the storing of these attributes also not likely to take much space, so LGTM !

[IRKnyazev]

I'm fine with the addition of classes, although it might not be obvious to use. For example, consider a shapelet extracted from class 0. It might be more discriminative toward class 2 due to the absence of a common pattern present in class 0 and 1 for example.

Yes I totally agree, that's exactly what made me want to use it in my notebook haha, being able to visualise shapelets and their source class should improve explainability