code: def setUpClass(cls):
      (
          cls.interactions,
          cls.user_features,
          cls.item_features,
      ) = generate_dummy_data_with_indicator(
          num_users=10, num_items=12, interaction_density=0.5
      )
  
imports: import math
  import numpy
  from unittest import TestCase
  from tensorrec import TensorRec
  from tensorrec.prediction_graphs import DotProductPredictionGraph, CosineSimilarityPredictionGraph, EuclideanSimilarityPredictionGraph
  from tensorrec.session_management import get_session
  from tensorrec.util import generate_dummy_data_with_indicator
label_desc: Use image node_id 1 for calling the PredictionGraphsTestCase obj's underlying member method code with example usage: obj.setUpClass(cls) without return types