Plans for supporting sparse matrices

[erc-mohd]

This is awesome and I really wanted to use it, however at some point it is converting the sparse numpy matrix to a dense matrix, which is unusable for my purposes because it causes a memory exception. Text classification in general uses pretty sparse feature vectors. The interface for this package is really nice otherwise.

[dumoulma]

I can take a look and make the modification.

[erc-mohd]

If possible, that'd be fantastic. Was really excited to see this, I am sad sk-learn doesn't have BNS in the core.