code: def estimate(self, u, i):
      return self.the_mean
  
file_path: Surprise/examples/building_custom_algorithms/most_basic_algorithm2.py
imports: import numpy
  from surprise import AlgoBase, Dataset
  from surprise.model_selection import cross_validate
label_desc: Use image node_id 3 for calling the MyOwnAlgorithm obj's underlying member method code with example usage: obj.estimate(u, i) and returns: self