graph.py 文件源码

def delta_minus(self, nodes):
        '''
        Returns the list of edges backwarding from a set of nodes
        '''
        bool_indices_head = np.array([x[0] not in nodes for x in self.edges])
        bool_indices_tail = np.array([x[1] in nodes for x in self.edges])
        bool_indices_edges = np.bitwise_and(
            bool_indices_head, bool_indices_tail)
        return self.edges[bool_indices_edges]