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
      )
  
file_path: tensorrec/test/test_loss_graphs.py
imports: from unittest import TestCase
  from tensorrec import TensorRec
  from tensorrec.loss_graphs import RMSELossGraph, RMSEDenseLossGraph, WMRBLossGraph, BalancedWMRBLossGraph
  from tensorrec.util import generate_dummy_data_with_indicator
label_desc: Use image node_id 1 for calling the LossGraphsTestCase obj's underlying member method code with example usage: obj.setUpClass(cls) without return types