ivanllt

Working on `FeatureAgglomeration`.

> Thanks for the PR @IvanLauLinTiong ! looks good. I just removed one of the tests because it will be covered by a common test. Okay thanks

> @jeremiedbb In this case, we don't modify the tree builder algorithm to perform the 32 bits operations? @glemaitre @jeremiedbb Hi, do I need to modify the tree builder algorithm...

@glemaitre @jeremiedbb Hello, any chances to help me review this? Thanks

Hi @jeremiedbb, could you advise me if there's any mistakes/or improvement that I still need to do for this PR? I'm happy to learn from mistakes and work more on...

> I discussed the problem with @ogrisel IRL. We agreed that we should also make sure that `fit` preserve dtype and that every computation should be done in `float32`. >...

@myasser63 Author had published some articles about this repo, you may read them here: https://towardsdatascience.com/implementing-ssd-in-keras-part-i-network-structure-da3323f11cff