code: def _multi_class_convert_output(self, exprs):
      return ast.SoftmaxExpr(exprs)
  
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 7 for calling the BaseBoostingAssembler obj's underlying member method code with example usage: obj._multi_class_convert_output(exprs) and returns: ast