KernelKnnCV_nmslib      Approximate Kernel k nearest neighbors
                        (cross-validated) using the nmslib library
KernelKnn_nmslib        Approximate Kernel k nearest neighbors using
                        the nmslib library
NMSlib                  Non metric space library
TO_scipy_sparse         conversion of an R sparse matrix to a scipy
                        sparse matrix
mat_2scipy_sparse       conversion of an R matrix to a scipy sparse
                        matrix
