pygsp
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New sphere graph
@mdeff I am not sure, we should have healpy as a dependency. It is a big package that takes time to install and we only use it for one function. What do you think?
Absolutely. It should be lazily imported (as matplotlib, pyqtgraph, flann, etc.). That is, it's only imported when the user calls the SphereHealpix
constructor, not when the pygsp is imported. The only hard dependencies are numpy and scipy. @Droxef did it correctly.