code: def neighbors(self) -> tuple[list[Vertex], list[float]]:
      res = tuple(
          map(
              list,
              zip(*((node, dist) for node, dist in self.edges.items())),
          )
      )
      return res if len(res) > 0 else ([], [])
  
imports: from __future__ import annotations
  import heapq
  import itertools
  import math
  import random
  from river import base
label_desc: Use image node_id 16 for calling the Vertex obj's underlying member method code with example usage: obj.neighbors() and returns: unknown