code: def pub_445_long_request_uri():
      mnistTrain = h2o.import_file(
          path=pyunit_utils.locate("bigdata/laptop/mnist/train.csv.gz")
      )
      mnistTest = h2o.import_file(
          path=pyunit_utils.locate("bigdata/laptop/mnist/train.csv.gz")
      )
  
      mnistTrain.set_name(col=784, name="label")
      mnistTest.set_name(col=784, name="label")
  
      mnistModel = H2OGradientBoostingEstimator(ntrees=2, max_depth=2)
      mnistModel.train(
          x=list(range(784)),
          y="label",
          training_frame=mnistTrain,
          validation_frame=mnistTest,
      )
  
imports: import sys
  import h2o
  from tests import pyunit_utils
  from h2o.estimators.gbm import H2OGradientBoostingEstimator
label_desc: Use image node_id 1 for calling a global function with example usage: pub_445_long_request_uri() without return types