def Sigmoid(input_vertex: vertex_constructor_param_types, label: Optional[str]=None) -> Vertex:
    """
    Applies the sigmoid function to a vertex.
    The sigmoid function is a special case of the Logistic function.
    
    :param input_vertex: the vertex
    """
    return Double(context.jvm_view().SigmoidVertex, label, cast_to_double_vertex(input_vertex))