code: def get_param_class(param_type):
      return {
          "model": ModelParam,
          "variable": VariableParam,
          "observation": ObservationParam,
          "dataset": DatasetParam,
      }.get(param_type)
  
imports: from abc import ABC, abstractmethod
  import numpy
  import math
  from pandas.api.types import is_numeric_dtype, is_bool_dtype, is_object_dtype
label_desc: Use image node_id 5 for calling the Param obj's underlying member method code with example usage: obj.get_param_class(param_type) and returns: dict