code: def fit(self, trainset):
      AlgoBase.fit(self, trainset)
  
      # Compute baselines and similarities
      self.bu, self.bi = self.compute_baselines()
      self.sim = self.compute_similarities()
  
      return self
  
imports: from surprise import AlgoBase, Dataset, PredictionImpossible
  from surprise.model_selection import cross_validate
label_desc: Use image node_id 2 for calling the MyOwnAlgorithm obj's underlying member method code with example usage: obj.fit(trainset) and returns: self