scikit-learn/scikit-learn — comment on commit 872e70d9b715be074aa761cbd9c40e29afd64d4f
File:  line 0
By amueller:

Thanks for the cleanup and the input check.
I don't understand the problem with accepting sparse matrices.
Sure, it 'destroys' the sparsity but the resulting features could be lower dimensional.
I haven't tested it and I'm not saying it does something sensible, it's just not clear to me why it should not work.

Also, I don't see a difference between RBFSampler and SkewedChi2Sampler in that respect.
Can you explain?