__init__.py 文件源码

def sparse(size, *args):
        """
        Create a sparse vector, using either a dictionary, a list of
        (index, value) pairs, or two separate arrays of indices and
        values (sorted by index).

        :param size: Size of the vector.
        :param args: Non-zero entries, as a dictionary, list of tuples,
                     or two sorted lists containing indices and values.

        >>> Vectors.sparse(4, {1: 1.0, 3: 5.5})
        SparseVector(4, {1: 1.0, 3: 5.5})
        >>> Vectors.sparse(4, [(1, 1.0), (3, 5.5)])
        SparseVector(4, {1: 1.0, 3: 5.5})
        >>> Vectors.sparse(4, [1, 3], [1.0, 5.5])
        SparseVector(4, {1: 1.0, 3: 5.5})
        """
        return SparseVector(size, *args)