toarray implementation in _cs_matrix

compressed.py

class _cs_matrix(_data_matrix, _minmax_mixin, IndexMixin):
    ...
    
    def toarray(self, order=None, out=None):
        if out is None and order is None:
            order = self._swap('cf')[0]
        out = self._process_toarray_args(order, out)
        if not (out.flags.c_contiguous or out.flags.f_contiguous):
            raise ValueError('Output array must be C or F contiguous')
        # align ideal order with output array order
        if out.flags.c_contiguous:
            x = self.tocsr()
            y = out
        else:
            x = self.tocsc()
            y = out.T
        M, N = x._swap(x.shape)
        _sparsetools.csr_todense(M, N, x.indptr, x.indices, x.data, y)
        return out