code: def setUp(self):
      num_nodes = 5
      edges = [(0, 1), (1, 2), (3, 4)]
      feature = np.random.randn(5, 100)
      edge_feature = np.random.randn(3, 100)
      self.graph = Graph(
          num_nodes=num_nodes,
          edges=edges,
          node_feat={"feature": feature},
          edge_feat={"edge_feature": edge_feature},
      )
  
imports: import unittest
  import numpy
  from pgl.graph import Graph
label_desc: Use image node_id 1 for calling the GraphTest obj's underlying member method code with example usage: obj.setUp() without return types