code: def assemble(self):
      if self._is_classification:
          if self._output_size == 1:
              return self._assemble_bin_class_output(
                  self._all_estimator_params
              )
          else:
              return self._assemble_multi_class_output(
                  self._all_estimator_params
              )
      else:
          result_ast = self._assemble_single_output(
              self._all_estimator_params, base_score=self._base_score
          )
          return self._single_convert_output(result_ast)
  
imports: import json
  import math
  import numpy
  from m2cgen import ast
  from m2cgen.assemblers import utils
  from m2cgen.assemblers.base import ModelAssembler
  from m2cgen.assemblers.linear import _linear_to_ast
label_desc: Use image node_id 2 for calling the BaseBoostingAssembler obj's underlying member method code with example usage: obj.assemble() and returns: self, self, self