code: def test_sample_neighbors_topk_outedge():
      _test_sample_neighbors_topk_outedge(False)
  
imports: import unittest
  import warnings
  import backend
  import dgl
  import numpy
  import pytest
label_desc: Use image node_id 21 for calling a global function with example usage: test_sample_neighbors_topk_outedge() without return types