code: def test_dot_product(self):
      model = TensorRec(prediction_graph=DotProductPredictionGraph())
      model.fit(
          self.interactions,
          self.user_features,
          self.item_features,
          epochs=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 2 for calling the PredictionGraphsTestCase obj's underlying member method code with example usage: obj.test_dot_product() without return types