Fix: remove the support of bcoo.fromdense #24
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setting nse=shape[0]*shape[1] will make the matrix fully dense and mpax very slow
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Fixes #20
Summary
In MPAX, we use
BCOO.fromdenseto convert anumpy.arraytoBCOO. To make the function safely jittable, we setnse=matrix.shape[0] * matrix.shape[1], which stores the matrix as fully dense in a sparse wrapper. Honestly, this does not make sense. This PR removes support fornumpy.arraywhenuse_sparse_matrix=True, to avoid silent performance issues like this.