code: def _assemble_estimators(self, estimator_params, split_idx):
      raise NotImplementedError
  
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 10 for calling the BaseBoostingAssembler obj's underlying member method code with example usage: obj._assemble_estimators(estimator_params, split_idx) without return types