code: def expand(self):
      one_d_variable = BanditVariable(self.name, self.domain, None)
      one_d_variable.dimensionality_in_model = self.domain.shape[1]
  
      return [one_d_variable]
  
imports: import numpy
  from copy import deepcopy
  from ..errors import InvalidConfigError
label_desc: Use image node_id 5 for calling the BanditVariable obj's underlying member method code with example usage: obj.expand() and returns: list