code: def test_DiscreteModelFit(self) -> None:
      discrete_model = DiscreteModel()
      discrete_model.fit(
          Xs=[[[0]]],
          Ys=[[0]],
          Yvars=[[1]],
          parameter_values=[[0, 1]],
          outcome_names=[],
      )
  
file_path: Ax/ax/models/tests/test_discrete.py
imports: import numpy
  from ax.models.discrete_base import DiscreteModel
  from ax.utils.common.testutils import TestCase
label_desc: Use image node_id 4 for calling the DiscreteModelTest obj's underlying member method code with example usage: obj.test_DiscreteModelFit() without return types