code: def link_functions_tweedie_vpow():
      # Load example data from HDtweedie, y = aggregate claim loss
      hdf = h2o.upload_file(
          pyunit_utils.locate("smalldata/glm_test/auto.csv")
      )
      y = "y"
      x = list(set(hdf.names) - set(["y"]))
  
      print("Testing for family: TWEEDIE")
      print("Create models with canonical link: TWEEDIE")
      # Iterate over different variance powers for tweedie
      vpower = [0, 1, 1.5]
      r_dev = [0.7516627, 0.6708826, 0.7733762]
      r_null = [221051.88369951, 32296.29783702, 20229.47425307]
      for ridx, vpow in enumerate(vpower):
          print("Fit h2o.glm:")
          h2ofit = H2OGeneralizedLinearEstimator(
              family="tweedie",
              link="tweedie",
              tweedie_variance_power=vpow,
              tweedie_link_power=1 - vpow,
              alpha=0.5,
              Lambda=0,
          )
          h2ofit.train(x=x, y=y, training_frame=hdf)
  
          print("Testing Tweedie variance power: {0}".format(vpow))
  
          print("Compare model deviances for link function tweedie")
          deviance_h2o_tweedie = old_div(
              h2ofit.residual_deviance(), h2ofit.null_deviance()
          )
  
          assert r_dev[ridx] - deviance_h2o_tweedie <= 0.01, (
              "h2o's residual/null deviance is more than 0.01 lower than "
              "R's. h2o: {0}, r: {1}".format(
                  deviance_h2o_tweedie, r_dev[ridx]
              )
          )
  
          print(
              "compare null and residual deviance between R glm and h2o.glm for tweedie"
          )
          assert abs(r_null[ridx] - h2ofit.null_deviance()) < 1e-3, (
              "h2o's null deviance is not equal to R's. h2o: {0}, r: "
              "{1}".format(h2ofit.null_deviance(), r_null[ridx])
          )
  
imports: from past.utils import old_div
  import sys
  import h2o
  from tests import pyunit_utils
  from h2o.estimators.glm import H2OGeneralizedLinearEstimator
label_desc: Use image node_id 1 for calling a global function with example usage: link_functions_tweedie_vpow() without return types