code: def setUpClass(cls):
      cls.session = get_session()
  
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 EuclideanSimilarityTestCase obj's underlying member method code with example usage: obj.setUpClass(cls) without return types