code: def schema():
      # use the default schema for 3
      schema = {
          0: "binary",
          1: "categorical:3",
          2: "binary",
          4: "continuous",
          5: "categorical:5",
      }
      return schema
  
imports: import operator
  from typing import Hashable, Tuple, Union
  import networkx
  import numpy
  import pandas
  import pytest
  from networkx.algorithms.dag import is_directed_acyclic_graph
  from sklearn.gaussian_process.kernels import RBF
  from causalnex.structure.data_generators.core import _sample_binary_from_latent, _sample_count_from_latent, _sample_poisson, generate_structure, nonlinear_sem_generator, sem_generator
  from causalnex.structure.structuremodel import StructureModel
label_desc: Use image node_id 2 for calling a global function with example usage: schema() and returns: schema