code: def test_custom_distribution_computation():
      test_regression()
      test_binomial()
      test_multinomial()
      test_null()
      test_worng_and_inherited_regression()
      test_wrong_multinomial()
      test_custom_distribution_reuse()
  
imports: import sys
  import h2o
  from tests import pyunit_utils
  from h2o.utils.distributions import CustomDistributionGaussian, CustomDistributionBernoulli, CustomDistributionMultinomial, CustomDistributionGeneric
  from tests.pyunit_utils import regression_model_distribution, regression_model_default
  from tests.pyunit_utils import multinomial_model_default, multinomial_model_distribution
  from tests.pyunit_utils import binomial_model_default, binomial_model_distribution, check_model_metrics
  from h2o.estimators.gbm import H2OGradientBoostingEstimator
label_desc: Use image node_id 2 for calling a global function with example usage: test_custom_distribution_computation() without return types