basic.py 文件源码

def _is_sparse_variable(x):
    """

    Returns
    -------
    boolean
        True iff x is a L{SparseVariable} (and not a L{tensor.TensorType},
        for instance).

    """
    if not isinstance(x, gof.Variable):
        raise NotImplementedError("this function should only be called on "
                                  "*variables* (of type sparse.SparseType "
                                  "or tensor.TensorType, for instance), not ",
                                  x)
    return isinstance(x.type, SparseType)