Method csc

python/dgl/sparse/sparse_matrix.py:172–201

r"""Returns the compressed sparse column (CSC) representation of the sparse matrix. See `CSC in Wikipedia `_. This function also returns value indices as an index tensor, indicating

(self)

        return self.c_sparse_matrix.csr()

    def csc(self) -> Tuple[torch.Tensor, torch.Tensor, torch.Tensor]:
        r"""Returns the compressed sparse column (CSC) representation of the
        sparse matrix.

        See `CSC in Wikipedia <https://en.wikipedia.org/wiki/
        Sparse_matrix#Compressed_sparse_column_(CSC_or_CCS)>`_.

        This function also returns value indices as an index tensor, indicating
        the order of the values of non-zero elements in the CSC representation.
        A ``None`` value indices array indicates the order of the values stays
        the same as the values of the SparseMatrix.

        Returns
        -------
        torch.Tensor
            Column indptr
        torch.Tensor
            Row indices
        torch.Tensor
            Value indices

        Examples
        --------

        >>> indices = torch.tensor([[1, 2, 1], [2, 4, 3]])
        >>> A = dglsp.spmatrix(indices)
        >>> A.csc()
        (tensor([0, 0, 0, 1, 2, 3]), tensor([1, 1, 2]), tensor([0, 2, 1]))
        """
        return self.c_sparse_matrix.csc()

    def to_dense(self) -> torch.Tensor:
        """Returns a copy in dense matrix format of the sparse matrix.