code: def create_tree(self):
          
          feature_indices = []
          for i in self.estimator.tree_.feature:
              n_features = self.n_features
              if self.n_features > 1 or (self.n_features == 1 and i >= 0):
                  feature_indices.append([str(j) for j in range(n_features)][i])
          indentation = 1 if self.target_language in ['java', 'js',
                                                      'php', 'ruby'] else 0
          return self.create_branches(
              self.estimator.tree_.children_left,
              self.estimator.tree_.children_right,
              self.estimator.tree_.threshold,
              self.estimator.tree_.value,
              feature_indices, 0, indentation)
docs: Parse and build the tree branches.
  
          Returns
          -------
          :return : string
              The tree branches as string.