def glm_grid_search_on_weights():
train = h2o.import_file(
pyunit_utils.locate("smalldata/logreg/prostate.csv"))
train = train.drop("ID")
train["CAPSULE"] = train["CAPSULE"].asfactor()
response = "CAPSULE"
features = list(train.col_names)
features.remove(response)
train['wt_2'] = (train["CAPSULE"] == "1").ifelse(2, 1)
train['wt_100'] = (train['CAPSULE'] == "1").ifelse(100, 1)
hyper_parameters = OrderedDict()
hyper_parameters["weights_column"] = ["wt_2", "wt_100"]
print("GLM grid with the following hyper_parameters:", hyper_parameters)
gs = H2OGridSearch(H2OGeneralizedLinearEstimator,
hyper_params=hyper_parameters)
gs.train(x=features, y=response, training_frame=train)
for m in gs.get_grid().models:
used_features = map(lambda x: x[1], m.varimp())
assert not ("wt_2" in used_features)
assert not ("wt_100" in used_features)
loglosses = gs.sorted_metric_table()["logloss"]
assert loglosses.nunique(
) == 2 # models are not identical (=> weights are considered)
def model_build():
bc_data_set1 = "/home/wso2123/My Work/Datasets/Breast cancer wisconsin/data.csv"
bc_data_train_dataset = "/home/wso2123/My Work/Datasets/Breast cancer wisconsin/uncorrected_train.csv"
bc_data_validate_dataset = "/home/wso2123/My Work/Datasets/Breast cancer wisconsin/validate.csv"
bc_data_test_dataset = "/home/wso2123/My Work/Datasets/Breast cancer wisconsin/test.csv"
train_data = h2o.import_file(bc_data_train_dataset)
validate_data = h2o.import_file(bc_data_validate_dataset)
test_data = h2o.import_file(bc_data_test_dataset)
#
# Train deep autoencoder learning model on "normal"
# training data, y ignored
#
hyper_parameters = {
'hidden':
range(10, 30),
'activation': [
"tanh", "tanh_with_dropout", "rectifier", "rectifier_with_dropout",
"maxout", "maxout_with_dropout"
]
}
grid_search = H2OGridSearch(H2ODeepLearningEstimator,
hyper_params=hyper_parameters)
grid_search.train(x=train_data.names,
training_frame=train_data,
validation_frame=validate_data)
grid_search.show()
v_frame = grid_search.varimp(True)
print v_frame
def test_stackedensemble_respects_the_max_runtime_secs():
max_runtime_secs = 1
hyper_parameters = dict()
hyper_parameters["ntrees"] = [1, 2, 3, 4, 5]
params = dict(
fold_assignment="modulo",
nfolds=3
)
data = prepare_data()
gs1 = H2OGridSearch(H2OGradientBoostingEstimator(**params), hyper_params=hyper_parameters)
gs1.train(data.x, data.y, data.train, validation_frame=data.train)
big_blending_frame = data.train
for i in range(15):
big_blending_frame = big_blending_frame.rbind(big_blending_frame)
se = H2OStackedEnsembleEstimator(
base_models=gs1.model_ids,
max_runtime_secs=max_runtime_secs,
blending_frame=big_blending_frame)
try:
se.train(data.x, data.y, data.train)
assert False, "This should have failed due to time out."
except H2OResponseError:
pass
def test_stackedensemble_propagates_the_max_runtime_secs():
max_runtime_secs = 5
hyper_parameters = dict()
hyper_parameters["ntrees"] = [1, 3, 5]
params = dict(
fold_assignment="modulo",
nfolds=3,
keep_cross_validation_predictions=True
)
data = prepare_data()
gs1 = H2OGridSearch(H2OGradientBoostingEstimator(**params), hyper_params=hyper_parameters)
gs1.train(data.x, data.y, data.train, validation_frame=data.train)
se = H2OStackedEnsembleEstimator(base_models=[gs1], max_runtime_secs=max_runtime_secs)
se.train(data.x, data.y, data.train)
metalearner = h2o.get_model(se.metalearner()["name"])
# metalearner has the set max_runtine_secs
assert metalearner.actual_params['max_runtime_secs'] <= max_runtime_secs
assert metalearner.actual_params['max_runtime_secs'] > 0
# stack ensemble has the set max_runtime_secs
assert se.max_runtime_secs == max_runtime_secs
def _prepare_test_env():
hyper_parameters = dict()
hyper_parameters["ntrees"] = [1, 3, 5]
params = dict(fold_assignment="modulo",
nfolds=3,
keep_cross_validation_predictions=True)
data = prepare_data()
drf = H2ORandomForestEstimator(**params)
drf.train(data.x, data.y, data.train, validation_frame=data.train)
gs1 = H2OGridSearch(H2OGradientBoostingEstimator(**params),
hyper_params=hyper_parameters)
gs1.train(data.x, data.y, data.train, validation_frame=data.train)
gs2 = H2OGridSearch(H2ORandomForestEstimator(**params),
hyper_params=hyper_parameters)
gs2.train(data.x, data.y, data.train, validation_frame=data.train)
return dict(data=data, drf=drf, gs1=gs1, gs2=gs2)
def test_mean_per_class_error_grid():
gbm = H2OGradientBoostingEstimator(nfolds=3, fold_assignment="Random", seed=1234)
cars = h2o.import_file(pyunit_utils.locate("smalldata/junit/cars_20mpg.csv"))
cars["cylinders"] = cars["cylinders"].asfactor()
r = cars[0].runif(seed=1234)
train = cars[r > .2]
valid = cars[r <= .2]
response_col = "cylinders"
predictors = ["displacement","power","weight","acceleration","year"]
gbm.distribution="multinomial"
## Early stopping
gbm.stopping_rounds=2
gbm.stopping_metric="mean_per_class_error"
gbm.ntrees=10000
gbm.max_depth=3
gbm.min_rows=1
gbm.learn_rate=0.01
gbm.score_tree_interval=1
gbm.nfolds=None
gbm.fold_assignment=None
gbm.train(x=predictors,y=response_col, training_frame=train, validation_frame=valid)
print(gbm)
print(gbm.scoring_history())
## Grid search
hyper_params_tune = {'max_depth' : list(range(1,10+1,1)),
'sample_rate': [x/100. for x in range(20,101)],
'col_sample_rate' : [x/100. for x in range(20,101)],
'col_sample_rate_per_tree': [x/100. for x in range(20,101)],
'col_sample_rate_change_per_level': [x/100. for x in range(90,111)],
'min_rows': [2**x for x in range(0,int(math.log(train.nrow,2)-2)+1)],
'nbins': [2**x for x in range(4,11)],
'nbins_cats': [2**x for x in range(4,13)],
'min_split_improvement': [0,1e-8,1e-6,1e-4],
'histogram_type': ["UniformAdaptive","QuantilesGlobal","RoundRobin"]}
search_criteria_tune = {'strategy': "RandomDiscrete",
'max_runtime_secs': 600, ## limit the runtime to 10 minutes
'max_models': 10,
'seed' : 1234,
'stopping_rounds' : 5,
'stopping_metric' : "mean_per_class_error",
'stopping_tolerance': 1e-3
}
grid = H2OGridSearch(H2OGradientBoostingEstimator, hyper_params=hyper_params_tune, search_criteria=search_criteria_tune)
grid.train(x=predictors, y=response_col, training_frame=train, validation_frame=valid,distribution="multinomial", seed=1234,
stopping_rounds = 10, stopping_metric = "mean_per_class_error", stopping_tolerance=1e-3)
print(grid) ## sorted by logloss
print(grid.get_grid("mean_per_class_error"))
def search(self, score_cutoff, param_space,
rand_seed, n_models,
const_params, cv_folds, training_frame,
model_directory, predictors, response):
if ("Windows" in platform()) and (self.estimator == H2OXGBoostEstimator):
incompatible_message = "Windows currently doesn't support H2OXGBoostEstimator. " \
"No xgboost models will be trained."
self.logger.info(incompatible_message)
print(incompatible_message)
return
criteria = {
'strategy': 'RandomDiscrete',
'max_models': n_models,
'seed': rand_seed,
# limit the runtime to 60 minutesS
'max_runtime_secs': self.max_minutes * 60,
# early stopping once the leaderboard of the top 5 models is converged to 0.1% relative difference
'stopping_rounds': 5,
'stopping_metric': self.eval_metric,
'stopping_tolerance': 1e-3
}
# Required for H2OStackedEnsembleEstimator
const_params.update({
'nfolds': cv_folds,
'keep_cross_validation_predictions': True,
'fold_assignment': "Modulo",
'seed': rand_seed
})
grid = H2OGridSearch(model=self.estimator(**const_params),
grid_id=self.name + '_grid',
hyper_params=param_space,
search_criteria=criteria)
self.logger.info("Training {} models ...".format(self.name))
# grid.train(x=X, y=Y, nfolds=configuration.CV_FOLDS, seed=rand_seed, training_frame=credit_data)
try:
grid.train(x=predictors, y=response, training_frame=training_frame)
except H2OResponseError:
self.logger.error('Encountered server error. Skipping ' + self.name)
return
self.logger.info("Finished training {} models.".format(self.name))
# Get the grid results, sorted
results = grid.get_grid(sort_by=self.eval_metric, decreasing=True)
for x in results:
print(get_model_cv_metric(x, self.eval_metric))
high_scoring = [model for model in results if get_model_cv_metric(model, self.eval_metric) > score_cutoff]
if not high_scoring:
self.logger.info('Failed to find models that meet the cut off.')
return
self.log_training_results(results=results, search_grid=param_space)
self.save_model_list(model_lst=high_scoring, seed=rand_seed, directory=model_directory)
def test_train_returns_the_trained_models():
fr = h2o.import_file(path=pu.locate("smalldata/prostate/prostate.csv"))
target = "CAPSULE"
fr[target] = fr[target].asfactor()
grid = H2OGridSearch(
H2OGradientBoostingEstimator,
dict(
ntrees=[5, 10],
learn_rate=[0.1, 0.5]
)
)
result = grid.train(y=target, training_frame=fr)
assert isinstance(result, H2OGridSearch)
assert result is grid
result.predict(fr)
def test_make_leaderboard_with_leaderboard_frame():
train = h2o.upload_file(
pyunit_utils.locate("smalldata/titanic/titanic_expanded.csv"))
train["name"] = train["name"].asfactor()
y = "fare"
aml = H2OAutoML(seed=1234, max_models=5)
aml.train(y=y, training_frame=train)
aml2 = H2OAutoML(seed=134, max_models=5)
aml2.train(y=y, training_frame=train)
grid = H2OGridSearch(H2OGradientBoostingEstimator(),
hyper_params={"ntrees": [1, 2, 3]})
grid.train(y=y, training_frame=train)
# with leaderboard frame
expected_cols = ("model_id", "rmse", "mse", "mae", "rmsle",
"mean_residual_deviance", "training_time_ms",
"predict_time_per_row_ms", "algo")
ldb = h2o.make_leaderboard(aml, train, extra_columns="ALL")
for c in expected_cols:
assert c in ldb.columns
for score_data in ("AUTO", "xval", "valid", "train"):
assert h2o.make_leaderboard(aml, train,
scoring_data=score_data).nrow > 0
assert h2o.make_leaderboard(
[aml, aml2], train, scoring_data=score_data).nrow > 0
assert h2o.make_leaderboard(grid, scoring_data=score_data).nrow > 0
assert h2o.make_leaderboard(
[aml, grid, aml2.leader], train, scoring_data=score_data).nrow > 0
# extra columns
for ec in ("training_time_ms", "predict_time_per_row_ms", "algo"):
assert ec in h2o.make_leaderboard(grid, train,
extra_columns=ec).columns
# extra columns without leaderboard frame
for ec in ("training_time_ms", "algo"):
assert ec in h2o.make_leaderboard(grid, extra_columns=ec).columns
# sort metrics
for sm in ("rmse", "mse", "mae", "rmsle", "mean_residual_deviance"):
assert h2o.make_leaderboard(grid, train,
sort_metric=sm).columns[1] == sm
def grid_search(training_df, attribute_property_length):
h2o.init()
h2o.connect()
training_array = training_df.values
x = training_array[:, 0:attribute_property_length]
y = training_array[:, attribute_property_length - 1]
tr_df = h2o.H2OFrame(x)
training_columns = [
'C1', 'C2', 'C3', 'C4', 'C5', 'C6', 'C7', 'C8', 'C9', 'C10'
]
response_column = 'C11'
hyper_parameters = {'ntrees': [15, 20, 25], 'max_depth': [15, 20]}
random_plus_manual = H2OGridSearch(
H2ORandomForestEstimator(nfolds=n_splits), hyper_parameters)
random_plus_manual.train(x=training_columns,
y=response_column,
training_frame=tr_df)
random_plus_manual.show()
def train_base_models(data):
grid = H2OGridSearch(
H2OGradientBoostingEstimator,
search_criteria=dict(
strategy='RandomDiscrete',
max_models=5,
seed=seed,
),
hyper_params=dict(
learn_rate=[0.5, 0.8, 1.0],
max_depth=[2, 3, 4, 5],
ntrees=[5, 10, 15],
),
)
grid.train(data.x,
data.y,
data.train,
nfolds=5,
fold_assignment='Modulo',
keep_cross_validation_predictions=True)
return grid.models
def test_make_leaderboard_without_leaderboard_frame():
train = h2o.upload_file(
pyunit_utils.locate("smalldata/titanic/titanic_expanded.csv"))
train["name"] = train["name"].asfactor()
y = "fare"
aml = H2OAutoML(seed=1234, max_models=5)
aml.train(y=y, training_frame=train)
aml2 = H2OAutoML(seed=134, max_models=5)
aml2.train(y=y, training_frame=train)
grid = H2OGridSearch(H2OGradientBoostingEstimator(),
hyper_params={"ntrees": [1, 2, 3]})
grid.train(y=y, training_frame=train)
assert h2o.make_leaderboard(aml).nrow > 0
assert h2o.make_leaderboard(aml).nrow == h2o.make_leaderboard(
aml
).nrow # creating the same leaderboard doesn't end up with duplicate models
assert h2o.make_leaderboard(grid).nrow > 0
assert h2o.make_leaderboard([aml, aml2, grid, aml.leader]).nrow > 0
# without leaderboard frame
for score_data in ("AUTO", "xval", "valid", "train"):
assert h2o.make_leaderboard(aml, scoring_data=score_data).nrow > 0
assert h2o.make_leaderboard([aml, aml2],
scoring_data=score_data).nrow > 0
assert h2o.make_leaderboard(grid, scoring_data=score_data).nrow > 0
assert h2o.make_leaderboard([aml, grid, aml2.leader],
scoring_data=score_data).nrow > 0
try:
print(
h2o.make_leaderboard(aml, extra_columns="predict_time_per_row_ms"))
assert False, "Should fail - Cannot calculate the predict time without leaderboard frame"
except h2o.exceptions.H2OResponseError:
pass
def grid_metric_accessors():
cars = h2o.import_file(
path=pyunit_utils.locate("smalldata/junit/cars_20mpg.csv"))
r = cars[0].runif()
train = cars[r > .2]
valid = cars[r <= .2]
# regression
response_col = "economy"
distribution = "gaussian"
predictors = ["displacement", "power", "weight", "acceleration", "year"]
gbm = H2OGradientBoostingEstimator(nfolds=3,
distribution=distribution,
fold_assignment="Random")
gbm_grid = H2OGridSearch(gbm, hyper_params=dict(ntrees=[1, 2, 3]))
gbm_grid.train(x=predictors,
y=response_col,
training_frame=train,
validation_frame=valid)
# using list from http://docs.h2o.ai/h2o/latest-stable/h2o-docs/performance-and-prediction.html#regression
for metric in ['r2', 'mse', 'rmse', 'rmsle', 'mae']:
val = getattr(gbm_grid, metric)()
assert isinstance(val, dict)
for v in val.values():
assert isinstance(
v, float), "expected a float for metric {} but got {}".format(
metric, v)
# binomial
cars = h2o.import_file(
path=pyunit_utils.locate("smalldata/junit/cars_20mpg.csv"))
cars["economy_20mpg"] = cars["economy_20mpg"].asfactor()
r = cars[0].runif()
train = cars[r > .2]
valid = cars[r <= .2]
response_col = "economy_20mpg"
distribution = "bernoulli"
predictors = ["displacement", "power", "weight", "acceleration", "year"]
gbm = H2OGradientBoostingEstimator(nfolds=3,
distribution=distribution,
fold_assignment="Random")
gbm_grid = H2OGridSearch(gbm, hyper_params=dict(ntrees=[1, 2, 3]))
gbm_grid.train(x=predictors,
y=response_col,
training_frame=train,
validation_frame=valid)
# using list from http://docs.h2o.ai/h2o/latest-stable/h2o-docs/performance-and-prediction.html#classification
# + common ones
for metric in ['gini', 'logloss', 'auc', 'aucpr', 'mse', 'rmse']:
val = getattr(gbm_grid, metric)()
assert isinstance(val, dict)
for v in val.values():
assert isinstance(
v, float), "expected a float for metric {} but got {}".format(
metric, v)
for metric in [
'mcc', 'F1', 'F0point5', 'F2', 'accuracy', 'mean_per_class_error'
]:
val = getattr(gbm_grid, metric)()
assert isinstance(val, dict)
for v in val.values():
assert isinstance(
v[0][1],
float), "expected a float for metric {} but got {}".format(
metric, v)
# multinomial
cars = h2o.import_file(
path=pyunit_utils.locate("smalldata/junit/cars_20mpg.csv"))
cars["cylinders"] = cars["cylinders"].asfactor()
r = cars[0].runif()
train = cars[r > .2]
valid = cars[r <= .2]
response_col = "cylinders"
distribution = "multinomial"
predictors = ["displacement", "power", "weight", "acceleration", "year"]
gbm = H2OGradientBoostingEstimator(nfolds=3,
distribution=distribution,
fold_assignment="Random")
gbm_grid = H2OGridSearch(gbm, hyper_params=dict(ntrees=[1, 2, 3]))
gbm_grid.train(x=predictors,
y=response_col,
training_frame=train,
validation_frame=valid)
# using list from http://docs.h2o.ai/h2o/latest-stable/h2o-docs/performance-and-prediction.html#classification
# + common ones
for metric in ['logloss', 'mse', 'rmse', 'mean_per_class_error']:
val = getattr(gbm_grid, metric)()
assert isinstance(val, dict)
for v in val.values():
assert isinstance(
v, float), "expected a float for metric {} but got {}".format(
metric, v)
h2o.export_file(hTrain, "hTrainMy.csv", force=True)
h2o.export_file(hValidate, "hValidateMy.csv", force=True)
h2o.export_file(hTesting, "hTestingMy.csv", force=True)
training_columns = list(pData.columns)
training_columns.remove('UnitNumber')
training_columns.remove('Time')
training_columns.remove('RUL')
response_column = 'RUL'
hyper_parameters = {
'activation': [
'Tanh', 'TanhWithDropout', 'Rectifier', 'RectifierWithDropout',
'Maxout', 'MaxoutWithDropout'
],
'epochs': [10, 50, 100],
'hidden': [32, 64, 128, 256, 512, 1024]
}
grid_search = H2OGridSearch(H2ODeepLearningEstimator,
hyper_params=hyper_parameters)
grid_search.train(x=training_columns,
y='RUL',
training_frame=hTrain,
validation_frame=hValidate)
grid_search.show()
models = grid_search.sort_by("mse")
print models
h2o.export_file(hTrain, "hTrainMy.csv", force=True)
h2o.export_file(hValidate, "hValidateMy.csv", force=True)
h2o.export_file(hTesting, "hTestingMy.csv", force=True)
training_columns = list(pData.columns)
training_columns.remove('UnitNumber')
training_columns.remove('Time')
training_columns.remove('RUL')
response_column = 'RUL'
hyper_parameters = {
'distribution': [
'auto', 'bernoulli', 'multinomial', 'gaussian', 'poisson', 'gamma',
'tweedie', 'laplace', 'quantile', 'huber'
],
'fold_assignment': ['auto', 'random', 'modulo', 'stratified'],
'histogram_type':
['auto', 'uniform_adaptive', 'random', 'quantiles_global', 'round_robin']
}
grid_search = H2OGridSearch(H2OGradientBoostingEstimator,
hyper_params=hyper_parameters)
grid_search.train(x=training_columns,
y='RUL',
training_frame=hTrain,
validation_frame=hValidate)
grid_search.show()
models = grid_search.sort_by("mse")
print(models)
# Split data inti training and validation
hTrain, hValidate = hData.split_frame(ratios=[0.8])
h2o.export_file(hTrain, "hTrainMy.csv", force=True)
h2o.export_file(hValidate, "hValidateMy.csv", force=True)
h2o.export_file(hTesting, "hTestingMy.csv", force=True)
training_columns = list(pData.columns)
training_columns.remove('UnitNumber')
training_columns.remove('Time')
training_columns.remove('RUL')
response_column = 'RUL'
hyper_parameters = {
'ntrees': [50, 75, 100],
'max_depth': [20, 50],
'nbins': [100, 250]
}
grid_search = H2OGridSearch(H2ORandomForestEstimator,
hyper_params=hyper_parameters)
grid_search.train(x=training_columns,
y='RUL',
training_frame=hTrain,
validation_frame=hValidate)
grid_search.show()
models = grid_search.sort_by("mse")
print models
def test_pubdev_6416(self):
# Attempt to add a model to the grid by specifying invalid hyperparameters search range.
# Should fail and generate error
data = h2o.import_file(
pyunit_utils.locate('smalldata/iris/iris_train.csv'))
hyper_params = {
'max_depth': [8],
'sample_rate': [.9],
'col_sample_rate': [.9],
'col_sample_rate_per_tree': [.9],
'col_sample_rate_change_per_level': [.9],
'min_rows': [5000000], # Invalid hyperparameter
'min_split_improvement': [1e-4],
'histogram_type': ["UniformAdaptive"]
}
search_criteria = {
'strategy': "RandomDiscrete",
'max_runtime_secs': 3600,
'max_models': 1,
'seed': 12345,
'stopping_rounds': 5,
'stopping_metric': "MSE",
'stopping_tolerance': 1e-3
}
gbm = H2OGradientBoostingEstimator(distribution='multinomial',
ntrees=5,
learn_rate=0.05,
score_tree_interval=5,
seed=1,
stopping_rounds=5,
stopping_metric="MSE",
stopping_tolerance=1e-4)
grid = H2OGridSearch(gbm,
hyper_params=hyper_params,
grid_id="grid_pubdev6416",
search_criteria=search_criteria)
with self.assertRaises(ValueError) as err:
grid.train(x=["sepal_len", "sepal_wid"],
y="species",
max_runtime_secs=3600,
training_frame=data)
# During the first search, the error should be present
assert "Details: ERRR on field: _min_rows: The dataset size is too small to split for min_rows=5000000.0: must have at least 1.0E7 (weighted) rows" \
in str(err.exception)
assert len(grid.models) == 0
hyper_params = {
'max_depth': [8],
'sample_rate': [.9],
'col_sample_rate': [.9],
'col_sample_rate_per_tree': [.9],
'col_sample_rate_change_per_level': [.9],
'min_rows': [10],
'min_split_improvement': [1e-4],
'histogram_type': ["UniformAdaptive"]
}
gbm = H2OGradientBoostingEstimator(distribution='multinomial',
ntrees=5,
learn_rate=0.05,
learn_rate_annealing=0.99,
score_tree_interval=5,
seed=1,
stopping_rounds=5,
stopping_metric="MSE",
stopping_tolerance=1e-4)
grid = H2OGridSearch(gbm,
hyper_params=hyper_params,
grid_id="grid_pubdev6416",
search_criteria=search_criteria)
grid.train(x=["sepal_len", "sepal_wid"],
y="species",
max_runtime_secs=3600,
training_frame=data)
# Assert the model is actually trained and added to the grid, not affected by previous exceptions
assert len(grid.models) == 1
# Grid search param options:
# http://docs.h2o.ai/h2o/latest-stable/h2o-docs/grid-search.html#xgboost-hyperparameters
gbm_params2 = {
'learn_rate': [i * 0.01 for i in range(1, 14)],
'max_depth': list(range(6, 11)),
'sample_rate': [i * 0.1 for i in range(4, 11)],
'col_sample_rate': [i * 0.1 for i in range(4, 11)]
}
# Train and validate a random grid of GBMs
gbm_grid2 = H2OGridSearch(model=H2OGradientBoostingEstimator(
ntrees=max_trees,
stopping_rounds=3,
stopping_tolerance=stop_tol,
keep_cross_validation_predictions=True),
hyper_params=gbm_params2,
search_criteria=search_criteria)
print("grid searching gbm")
gbm_grid2.train(x=train_cols,
y='Dry_Yield',
training_frame=df,
fold_column='YearID_KFold')
print(gbm_grid2)
gbm_best = gbm_grid2.get_grid(sort_by='mae').models[0]
print(gbm_best)
gbm_ids = [m.model_id for m in gbm_grid2.models[:stack_top_n_grid_results]]
# random forest
drf_params = {
def pyunit_mean_per_class_error():
gbm = H2OGradientBoostingEstimator(nfolds=3,
fold_assignment="Random",
seed=1234)
## Binomial
cars = h2o.import_file(
pyunit_utils.locate("smalldata/junit/cars_20mpg.csv"))
cars["economy_20mpg"] = cars["economy_20mpg"].asfactor()
r = cars[0].runif(seed=1234)
train = cars[r > .2]
valid = cars[r <= .2]
response_col = "economy_20mpg"
predictors = ["displacement", "power", "weight", "acceleration", "year"]
gbm.distribution = "bernoulli"
gbm.train(y=response_col,
x=predictors,
validation_frame=valid,
training_frame=train)
print(gbm)
mpce = gbm.mean_per_class_error([0.5, 0.8]) ## different thresholds
assert (abs(mpce[0][1] - 0.004132231404958664) < 1e-5)
assert (abs(mpce[1][1] - 0.021390374331550777) < 1e-5)
## score on train first
print(
gbm.model_performance(train).mean_per_class_error(
thresholds=[0.3, 0.5]))
## Multinomial
cars = h2o.import_file(
pyunit_utils.locate("smalldata/junit/cars_20mpg.csv"))
cars["cylinders"] = cars["cylinders"].asfactor()
r = cars[0].runif(seed=1234)
train = cars[r > .2]
valid = cars[r <= .2]
response_col = "cylinders"
predictors = ["displacement", "power", "weight", "acceleration", "year"]
gbm.distribution = "multinomial"
gbm.train(x=predictors,
y=response_col,
training_frame=train,
validation_frame=valid)
print(gbm)
mpce = gbm.mean_per_class_error(train=True)
assert (mpce == 0)
mpce = gbm.mean_per_class_error(valid=True)
# assert(abs(mpce - 0.207142857143 ) < 1e-5)
assert (abs(mpce - 0.407142857143) < 1e-5)
mpce = gbm.mean_per_class_error(xval=True)
# assert(abs(mpce - 0.350071715433 ) < 1e-5)
assert (abs(mpce - 0.35127653471) < 1e-5)
## Early stopping
gbm.stopping_rounds = 2
gbm.stopping_metric = "mean_per_class_error"
gbm.ntrees = 10000
gbm.max_depth = 3
gbm.min_rows = 1
gbm.learn_rate = 0.01
gbm.score_tree_interval = 1
gbm.nfolds = None
gbm.fold_assignment = None
gbm.train(x=predictors,
y=response_col,
training_frame=train,
validation_frame=valid)
print(gbm)
print(gbm.scoring_history())
## Grid search
hyper_params_tune = {
'max_depth': list(range(1, 10 + 1, 1)),
'sample_rate': [x / 100. for x in range(20, 101)],
'col_sample_rate': [x / 100. for x in range(20, 101)],
'col_sample_rate_per_tree': [x / 100. for x in range(20, 101)],
'col_sample_rate_change_per_level': [x / 100. for x in range(90, 111)],
'min_rows':
[2**x for x in range(0,
int(math.log(train.nrow, 2) - 2) + 1)],
'nbins': [2**x for x in range(4, 11)],
'nbins_cats': [2**x for x in range(4, 13)],
'min_split_improvement': [0, 1e-8, 1e-6, 1e-4],
'histogram_type': ["UniformAdaptive", "QuantilesGlobal", "RoundRobin"]
}
search_criteria_tune = {
'strategy': "RandomDiscrete",
'max_runtime_secs': 600, ## limit the runtime to 10 minutes
'max_models': 10,
'seed': 1234,
'stopping_rounds': 5,
'stopping_metric': "mean_per_class_error",
'stopping_tolerance': 1e-3
}
grid = H2OGridSearch(H2OGradientBoostingEstimator,
hyper_params=hyper_params_tune,
search_criteria=search_criteria_tune)
grid.train(x=predictors,
y=response_col,
training_frame=train,
validation_frame=valid,
distribution="multinomial",
seed=1234,
stopping_rounds=10,
stopping_metric="mean_per_class_error",
stopping_tolerance=1e-3)
print(grid) ## sorted by logloss
print(grid.get_grid("mean_per_class_error"))
# Split data inti training and validation
hTrain, hValidate = hData.split_frame(ratios=[0.8])
h2o.export_file(hTrain, "hTrainMy.csv", force=True)
h2o.export_file(hValidate, "hValidateMy.csv", force=True)
response_column = 'RUL'
hyper_parameters = {
'activation': [
'Tanh', 'TanhWithDropout', 'Rectifier', 'RectifierWithDropout',
'Maxout', 'MaxoutWithDropout'
],
'hidden': [4, 6, 8, 10, 12, 14, 16, 18, 20],
'epochs': [50, 100, 150],
'loss': ['Quadratic', 'Absolute', 'Huber'],
'distribution': [
'AUTO', 'bernoulli', 'multinomial', 'poisson', 'gamma', 'tweedie',
'laplace', 'huber', 'quantile', 'gaussian'
]
}
grid_search = H2OGridSearch(H2OAutoEncoderEstimator,
hyper_params=hyper_parameters)
grid_search.train(x=selected_columns,
training_frame=hTrain,
validation_frame=hValidate)
grid_search.show()
models = grid_search.sort_by("mse")
print models