SMTorg / smt / 27279545286

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Add the possibility to give an array-like input for n_comp option in KPLS (#816)

… and test the range of n_dim and choose the best one. It has been
refactored to take into account the advice given by @Paul-Saves.

I added unit tests (some of them are quite long due to the exhaustive
search, so I marked them as
`@unittest.skipIf(int(os.getenv("RUN_SLOW_TESTS", 0)) < 1, "too
slow")`).

I updated the docs with a new example and added some description to the
parameters.

I also added a little safeguard on the number of k_fold min based on the
number of training points:
```python
k_fold = min(4, original_nt)
```

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Co-authored-by: Saves Paul <paul.saves@alumni.enac.fr>

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