def test_gbm_bulk_cv():
response = "survived"
titanic = h2o.import_file(path=pyunit_utils.locate("smalldata/gbm_test/titanic.csv"))
titanic[response] = titanic[response].asfactor()
predictors = ["survived", "name", "sex", "age", "sibsp", "parch", "ticket", "fare", "cabin"]
train, valid = titanic.split_frame(ratios=[.8], seed=1234)
titanic_gbm = H2OGradientBoostingEstimator(seed=1234, nfolds=2, build_tree_one_node=True)
titanic_gbm.train_segments(segments=["pclass"],
x=predictors,
y=response,
training_frame=train,
validation_frame=valid,
segment_models_id="titanic_by_pclass")
train_cl1 = train[train["pclass"] == 1]
valid_cl1 = valid[valid["pclass"] == 1]
titanic_cl1_gbm = H2OGradientBoostingEstimator(seed=1234, nfolds=2)
titanic_cl1_gbm.train(x=predictors,
y=response,
training_frame=train_cl1,
validation_frame=valid_cl1)
titanic_models = H2OSegmentModels(segment_models_id="titanic_by_pclass")
bulk_models = titanic_models.as_frame()
titanic_bulk_cl1_gbm_id = (bulk_models[bulk_models["pclass"] == 1]["model"])
titanic_bulk_cl1_gbm = h2o.get_model(titanic_bulk_cl1_gbm_id.flatten())
pyunit_utils.check_models(titanic_cl1_gbm, titanic_bulk_cl1_gbm, use_cross_validation=True)
def demo_xval_with_validation_frame():
prostate = h2o.import_file(path=pyunit_utils.locate("smalldata/logreg/prostate.csv"))
prostate[1] = prostate[1].asfactor()
print(prostate.summary())
# invert the response
prostate_inverse = h2o.import_file(path=pyunit_utils.locate("smalldata/logreg/prostate.csv"))
resp = (1 - prostate_inverse[1])
prostate_inverse[1] = resp.asfactor()
print(prostate_inverse.summary())
# 50 is a default but lets be explict
ntrees = 50
X = list(range(2,9))
y = 1
# 1. Train a model with 5-fold xval, no validation frame
prostate_gbm = H2OGradientBoostingEstimator(nfolds=5,
ntrees=ntrees,
distribution="bernoulli",
seed=1,
score_each_iteration=True,
stopping_rounds=3)
prostate_gbm.train(x=X, y=y, training_frame=prostate)
prostate_gbm.show()
# stopped early
assert get_ntrees(prostate_gbm) < ntrees
# 2. Show that training a model without xval with inverted validation frame triggers early stopping earlier
# Validation frame contradicts the training frame and training should stop right away
prostate_gbm_noxval = H2OGradientBoostingEstimator(ntrees=ntrees,
distribution="bernoulli",
seed=1,
score_each_iteration=True,
stopping_rounds=3)
prostate_gbm_noxval.train(x=X, y=y, training_frame=prostate, validation_frame=prostate_inverse)
prostate_gbm_noxval.show()
# stopped almost immediately
assert get_ntrees(prostate_gbm_noxval) == 6
# earlier then in case of (1)
assert get_ntrees(prostate_gbm_noxval) < get_ntrees(prostate_gbm)
# 3. Train a model with 5-fold xval this time with inverted frame as the validation frame
prostate_gbm_v = H2OGradientBoostingEstimator(nfolds=5,
ntrees=ntrees,
distribution="bernoulli",
seed=1,
score_each_iteration=True,
stopping_rounds=3)
prostate_gbm_v.train(x=X, y=y, training_frame=prostate, validation_frame=prostate_inverse)
prostate_gbm_v.show()
# Models (1) and (3) are the same => validation cannot be used for early stopping in xval setting
# Otherwise we would have stopped earlier as we see in (2)
pyunit_utils.check_models(prostate_gbm, prostate_gbm_v)
# Stopped early with same number of trees build as in (1)
assert get_ntrees(prostate_gbm) == get_ntrees(prostate_gbm_v)
def model_comparator(frame1, frame2, col_ind, rows1, numElements):
assert numElements == 0
models1 = frame1[col_ind].as_data_frame()
models2 = frame2[col_ind].as_data_frame()
for i in range(rows1):
model_id_1 = str(models1.iloc[i][0])
model_1 = h2o.get_model(model_id_1)
model_id_2 = str(models2.iloc[i][0])
model_2 = h2o.get_model(model_id_2)
print("###### Comparing model {0} and model {1}.".format(
model_1.model_id, model_2.model_id))
pyunit_utils.check_models(model_1, model_2)
def test_if_train_segments():
prostate = h2o.import_file(
path=pyunit_utils.locate("smalldata/logreg/prostate.csv"))
prostate["CAPSULE"] = prostate["CAPSULE"].asfactor()
# model will be built for each segment
segment_col = "RACE"
# segment 0 is too small, will not produce a model
bad_segment = 0
segments = prostate[segment_col].unique()
segments.rename({'C1': segment_col})
params = {"min_rows": 2, "ntrees": 4, "seed": 42, "sample_size": 10}
prostate_if = H2OIsolationForestEstimator(**params)
models = prostate_if.train_segments(ignored_columns=["ID"],
training_frame=prostate,
segments=segments)
models_list = models.as_frame()
print(models_list)
assert models_list.names == [
u'RACE', u'model', u'status', u'errors', u'warnings'
]
assert models_list.nrow == 3
# Check failed models
expected_error = 'ERRR on field: _min_rows: The dataset size is too small to split for min_rows=2.0: ' \
'must have at least 4.0 (weighted) rows, but have only 3.0.\n'
assert (models_list["errors"][models_list[segment_col] == bad_segment]
).as_data_frame()["errors"][0] == expected_error
mp = models_list.as_data_frame()
# Check built models
for i in range(mp.shape[0]):
segment = int(mp.iloc[i][segment_col])
status = str(mp.iloc[i]["status"])
if segment != bad_segment:
assert status == "SUCCEEDED"
model_id = mp.iloc[i]["model"]
model = h2o.get_model(model_id)
prostate_segment = prostate[prostate[segment_col] == segment]
prostate_if_segment = H2OIsolationForestEstimator(**params)
prostate_if_segment.train(ignored_columns=["ID", segment_col],
training_frame=prostate_segment)
pyunit_utils.check_models(model, prostate_if_segment)
preds_actual = model.predict(prostate_segment)
preds_expected = prostate_if_segment.predict(prostate_segment)
assert_frame_equal(preds_actual.as_data_frame(True),
preds_expected.as_data_frame(True))
else:
assert status == "FAILED"
def test_gbm_bulk_train():
prostate = h2o.import_file(
path=pyunit_utils.locate("smalldata/logreg/prostate.csv"))
prostate["CAPSULE"] = prostate["CAPSULE"].asfactor()
# model will be built for each segment
segment_col = "RACE"
# segment 0 is too small, will not produce a model
bad_segment = 0
segments = prostate[segment_col].unique()
segments.rename({'C1': segment_col})
params = {"min_rows": 2, "ntrees": 4, "seed": 42}
prostate_gbm = H2OGradientBoostingEstimator(**params)
models = prostate_gbm.bulk_train(y="CAPSULE",
ignored_columns=["ID"],
training_frame=prostate,
segments=segments)
models_list = models.as_frame()
assert models_list.names == [
u'RACE', u'Status', u'Model', u'Errors', u'Warnings'
]
assert models_list.nrow == 3
# Check failed models
expected_error = 'ERRR on field: _min_rows: The dataset size is too small to split for min_rows=2.0: ' \
'must have at least 4.0 (weighted) rows, but have only 3.0.\n'
assert (models_list["Errors"][models_list[segment_col] == bad_segment]
).as_data_frame()["Errors"][0] == expected_error
mp = models_list.as_data_frame()
# Check built models
for i in range(mp.shape[0]):
segment = int(mp.iloc[i][segment_col])
if segment != bad_segment:
model_id = mp.iloc[i]["Model"]
model = h2o.get_model(model_id)
prostate_segment = prostate[prostate[segment_col] == segment]
prostate_gbm_segment = H2OGradientBoostingEstimator(**params)
prostate_gbm_segment.train(y="CAPSULE",
ignored_columns=["ID"],
training_frame=prostate_segment)
pyunit_utils.check_models(model, prostate_gbm_segment)
def cv_carsRF():
# read in the dataset and construct training set (and validation set)
cars = h2o.import_file(path=pyunit_utils.locate("smalldata/junit/cars_20mpg.csv"))
# choose the type model-building exercise (multinomial classification or regression). 0:regression, 1:binomial,
# 2:multinomial
problem = random.sample(list(range(3)),1)[0]
problem = 2
# pick the predictors and the correct response column
predictors = ["displacement","power","weight","acceleration","year"]
if problem == 1 :
response_col = "economy_20mpg"
cars[response_col] = cars[response_col].asfactor()
elif problem == 2 :
response_col = "cylinders"
cars[response_col] = cars[response_col].asfactor()
else :
response_col = "economy"
print("Response column: {0}".format(response_col))
## cross-validation
# 1. check that cv metrics are the same over repeated seeded "Modulo" runs
nfolds = random.randint(3,10)
rf1 = H2ORandomForestEstimator(nfolds=nfolds, fold_assignment="Modulo", seed=1234)
rf1.train(x=predictors, y=response_col, training_frame=cars)
rf2 = H2ORandomForestEstimator(nfolds=nfolds, fold_assignment="Modulo", seed=1234)
rf2.train(x=predictors, y=response_col, training_frame=cars)
pyunit_utils.check_models(rf1, rf2, True)
# 2. check that cv metrics are different over repeated "Random" runs
nfolds = random.randint(3,10)
rf1 = H2ORandomForestEstimator(nfolds=nfolds, fold_assignment="Random")
rf1.train(x=predictors, y=response_col, training_frame=cars)
rf2 = H2ORandomForestEstimator(nfolds=nfolds, fold_assignment="Random")
rf2.train(x=predictors, y=response_col, training_frame=cars)
try:
pyunit_utils.check_models(rf1, rf2, True)
assert False, "Expected models to be different over repeated Random runs"
except AssertionError:
assert True
# 3. folds_column
num_folds = random.randint(2,5)
fold_assignments = h2o.H2OFrame([[random.randint(0,num_folds-1)] for f in range(cars.nrow)])
fold_assignments.set_names(["fold_assignments"])
cars = cars.cbind(fold_assignments)
rf = H2ORandomForestEstimator(keep_cross_validation_predictions=True)
rf.train(y=response_col, x=predictors, training_frame=cars, fold_column="fold_assignments")
num_cv_models = len(rf._model_json['output']['cross_validation_models'])
assert num_cv_models==num_folds, "Expected {0} cross-validation models, but got " \
"{1}".format(num_folds, num_cv_models)
cv_model1 = h2o.get_model(rf._model_json['output']['cross_validation_models'][0]['name'])
cv_model2 = h2o.get_model(rf._model_json['output']['cross_validation_models'][1]['name'])
# 4. keep_cross_validation_predictions
cv_predictions = rf1._model_json['output']['cross_validation_predictions']
assert cv_predictions is None, "Expected cross-validation predictions to be None, but got {0}".format(cv_predictions)
cv_predictions = rf._model_json['output']['cross_validation_predictions']
assert len(cv_predictions)==num_folds, "Expected the same number of cross-validation predictions " \
"as folds, but got {0}".format(len(cv_predictions))
## boundary cases
# 1. nfolds = number of observations (leave-one-out cross-validation)
rf = H2ORandomForestEstimator(nfolds=cars.nrow, fold_assignment="Modulo")
rf.train(y=response_col, x=predictors, training_frame=cars)
# 2. nfolds = 0
rf1 = H2ORandomForestEstimator(nfolds=0, seed=1234)
rf1.train(y=response_col, x=predictors, training_frame=cars)
# check that this is equivalent to no nfolds
rf2 = H2ORandomForestEstimator(seed=1234)
rf2.train(y=response_col, x=predictors, training_frame=cars)
pyunit_utils.check_models(rf1, rf2)
# 3. cross-validation and regular validation attempted
rf = H2ORandomForestEstimator(nfolds=random.randint(3,10))
rf.train(y=response_col, x=predictors, training_frame=cars, validation_frame=cars)
## error cases
# 1. nfolds == 1 or < 0
try:
rf = H2ORandomForestEstimator(nfolds=random.sample([-1,1], 1)[0])
rf.train(y=response_col, x=predictors, training_frame=cars)
assert False, "Expected model-build to fail when nfolds is 1 or < 0"
except EnvironmentError:
assert True
# 2. more folds than observations
try:
rf = H2ORandomForestEstimator(nfolds=cars.nrow+1, fold_assignment="Modulo")
rf.train(y=response_col, x=predictors, training_frame=cars)
assert False, "Expected model-build to fail when nfolds > nobs"
except EnvironmentError:
assert True
# 3. fold_column and nfolds both specified
try:
rf = H2ORandomForestEstimator(nfolds=3)
rf.train(y=response_col, x=predictors, fold_column="fold_assignments", training_frame=cars)
assert False, "Expected model-build to fail when fold_column and nfolds both specified"
except EnvironmentError:
assert True
def cv_cars_glm():
# read in the dataset and construct training set (and validation set)
cars = h2o.import_file(path=pyunit_utils.locate("smalldata/junit/cars_20mpg.csv"))
# choose the type model-building exercise (multinomial classification or regression). 0:regression, 1:binomial,
# 2:poisson
problem = random.sample(list(range(3)),1)[0]
# pick the predictors and response column, along with the correct family
predictors = ["displacement","power","weight","acceleration","year"]
if problem == 1 :
response_col = "economy_20mpg"
family = "binomial"
cars[response_col] = cars[response_col].asfactor()
elif problem == 2 :
family = "poisson"
response_col = "cylinders"
else :
family = "gaussian"
response_col = "economy"
print("Distribution: {0}".format(family))
print("Response column: {0}".format(response_col))
## cross-validation
# 1. check that cv metrics are the same over repeated "Modulo" runs
nfolds = random.randint(3,10)
glm1 = H2OGeneralizedLinearEstimator(nfolds=nfolds, family=family, fold_assignment="Modulo")
glm1.train(x=predictors, y=response_col, training_frame=cars)
glm2 = H2OGeneralizedLinearEstimator(nfolds=nfolds, family=family, fold_assignment="Modulo")
glm2.train(x=predictors, y=response_col, training_frame=cars)
pyunit_utils.check_models(glm1, glm2, True)
# 2. check that cv metrics are different over repeated "Random" runs
nfolds = random.randint(3,10)
glm1 = H2OGeneralizedLinearEstimator(nfolds=nfolds, family=family, fold_assignment="Random")
glm1.train(x=predictors, y=response_col, training_frame=cars)
glm2 = H2OGeneralizedLinearEstimator(nfolds=nfolds, family=family, fold_assignment="Random")
glm2.train(x=predictors, y=response_col, training_frame=cars)
try:
pyunit_utils.check_models(glm1, glm2, True)
assert False, "Expected models to be different over repeated Random runs"
except AssertionError:
assert True
# 3. folds_column
num_folds = random.randint(2,5)
fold_assignments = h2o.H2OFrame([[random.randint(0,num_folds-1)] for f in range(cars.nrow)])
fold_assignments.set_names(["fold_assignments"])
cars = cars.cbind(fold_assignments)
glm = H2OGeneralizedLinearEstimator(family=family, keep_cross_validation_predictions=True)
glm.train(x=predictors, y=response_col, training_frame=cars, fold_column="fold_assignments")
num_cv_models = len(glm._model_json['output']['cross_validation_models'])
assert num_cv_models==num_folds, "Expected {0} cross-validation models, but got " \
"{1}".format(num_folds, num_cv_models)
cv_model1 = h2o.get_model(glm._model_json['output']['cross_validation_models'][0]['name'])
cv_model2 = h2o.get_model(glm._model_json['output']['cross_validation_models'][1]['name'])
# 4. keep_cross_validation_predictions
cv_predictions = glm1._model_json['output']['cross_validation_predictions']
assert cv_predictions is None, "Expected cross-validation predictions to be None, but got {0}".format(cv_predictions)
cv_predictions = glm._model_json['output']['cross_validation_predictions']
assert len(cv_predictions)==num_folds, "Expected the same number of cross-validation predictions " \
"as folds, but got {0}".format(len(cv_predictions))
# 2. nfolds = 0
glm1 = H2OGeneralizedLinearEstimator(nfolds=0, family=family)
glm1.train(x=predictors, y=response_col, training_frame=cars)
# check that this is equivalent to no nfolds
glm2 = H2OGeneralizedLinearEstimator(family=family)
glm2.train(x=predictors, y=response_col, training_frame=cars)
pyunit_utils.check_models(glm1, glm2)
# 3. cross-validation and regular validation attempted
glm = H2OGeneralizedLinearEstimator(nfolds=random.randint(3,10), family=family)
glm.train(x=predictors, y=response_col, training_frame=cars, validation_frame=cars)
## error cases
# 1. nfolds == 1 or < 0
try:
glm = H2OGeneralizedLinearEstimator(nfolds=random.sample([-1,1], 1)[0], family=family)
glm.train(x=predictors, y=response_col, training_frame=cars)
assert False, "Expected model-build to fail when nfolds is 1 or < 0"
except EnvironmentError:
assert True
# 2. more folds than observations
try:
glm = H2OGeneralizedLinearEstimator(nfolds=cars.nrow+1, family=family, fold_assignment="Modulo")
glm.train(x=predictors, y=response_col, training_frame=cars)
assert False, "Expected model-build to fail when nfolds > nobs"
except EnvironmentError:
assert True
# 3. fold_column and nfolds both specified
try:
glm = H2OGeneralizedLinearEstimator(nfolds=3, family=family)
glm.train(x=predictors, y=response_col, training_frame=cars, fold_column="fold_assignments")
assert False, "Expected model-build to fail when fold_column and nfolds both specified"
except EnvironmentError:
assert True
def cv_carsDL():
# read in the dataset and construct training set (and validation set)
cars = h2o.import_file(path=pyunit_utils.locate("smalldata/junit/cars_20mpg.csv"))
# choose the type model-building exercise (multinomial classification or regression). 0:regression, 1:binomial,
# 2:multinomial
problem = random.sample(range(3), 1)[0]
# pick the predictors and the correct response column
predictors = ["displacement", "power", "weight", "acceleration", "year"]
if problem == 1:
response_col = "economy_20mpg"
cars[response_col] = cars[response_col].asfactor()
elif problem == 2:
response_col = "cylinders"
cars[response_col] = cars[response_col].asfactor()
else:
response_col = "economy"
print "Response column: {0}".format(response_col)
## cross-validation
# 1. basic
dl = h2o.deeplearning(
y=cars[response_col], x=cars[predictors], nfolds=random.randint(3, 10), fold_assignment="Modulo"
)
# 2. check that cv metrics are different over repeated "Random" runs
nfolds = random.randint(3, 10)
dl1 = h2o.deeplearning(y=cars[response_col], x=cars[predictors], nfolds=nfolds, fold_assignment="Random")
dl2 = h2o.deeplearning(y=cars[response_col], x=cars[predictors], nfolds=nfolds, fold_assignment="Random")
try:
pyunit_utils.check_models(dl1, dl2, True)
assert False, "Expected models to be different over repeated Random runs"
except AssertionError:
assert True
# 3. folds_column
num_folds = random.randint(2, 5)
fold_assignments = h2o.H2OFrame(python_obj=zip(*[[random.randint(0, num_folds - 1)] for f in range(cars.nrow)]))
fold_assignments.set_names(["fold_assignments"])
cars = cars.cbind(fold_assignments)
dl = h2o.deeplearning(
y=cars[response_col],
x=cars[predictors],
training_frame=cars,
fold_column="fold_assignments",
keep_cross_validation_predictions=True,
)
num_cv_models = len(dl._model_json["output"]["cross_validation_models"])
assert num_cv_models == num_folds, "Expected {0} cross-validation models, but got " "{1}".format(
num_folds, num_cv_models
)
cv_model1 = h2o.get_model(dl._model_json["output"]["cross_validation_models"][0]["name"])
cv_model2 = h2o.get_model(dl._model_json["output"]["cross_validation_models"][1]["name"])
assert isinstance(cv_model1, type(dl)), (
"Expected cross-validation model to be the same model type as the "
"constructed model, but got {0} and {1}".format(type(cv_model1), type(dl))
)
assert isinstance(cv_model2, type(dl)), (
"Expected cross-validation model to be the same model type as the "
"constructed model, but got {0} and {1}".format(type(cv_model2), type(dl))
)
# 4. keep_cross_validation_predictions
cv_predictions = dl1._model_json["output"]["cross_validation_predictions"]
assert cv_predictions is None, "Expected cross-validation predictions to be None, but got {0}".format(
cv_predictions
)
cv_predictions = dl._model_json["output"]["cross_validation_predictions"]
assert (
len(cv_predictions) == num_folds
), "Expected the same number of cross-validation predictions " "as folds, but got {0}".format(len(cv_predictions))
## boundary cases
# 1. nfolds = number of observations (leave-one-out cross-validation)
dl = h2o.deeplearning(y=cars[response_col], x=cars[predictors], nfolds=cars.nrow, fold_assignment="Modulo")
# 2. nfolds = 0
dl = h2o.deeplearning(y=cars[response_col], x=cars[predictors], nfolds=0)
# 3. cross-validation and regular validation attempted
dl = h2o.deeplearning(
y=cars[response_col],
x=cars[predictors],
nfolds=random.randint(3, 10),
validation_y=cars[response_col],
validation_x=cars[predictors],
)
## error cases
# 1. nfolds == 1 or < 0
try:
dl = h2o.deeplearning(y=cars[response_col], x=cars[predictors], nfolds=random.sample([-1, 1], 1)[0])
assert False, "Expected model-build to fail when nfolds is 1 or < 0"
except EnvironmentError:
assert True
# 2. more folds than observations
try:
dl = h2o.deeplearning(y=cars[response_col], x=cars[predictors], nfolds=cars.nrow + 1, fold_assignment="Modulo")
assert False, "Expected model-build to fail when nfolds > nobs"
except EnvironmentError:
assert True
# 3. fold_column and nfolds both specified
try:
rf = h2o.deeplearning(
y=cars[response_col], x=cars[predictors], nfolds=3, fold_column="fold_assignments", training_frame=cars
)
assert False, "Expected model-build to fail when fold_column and nfolds both specified"
except EnvironmentError:
assert True
def cv_cars_dw():
if not H2ODeepWaterEstimator.available(): return
# read in the dataset and construct training set (and validation set)
cars = h2o.import_file(path=pyunit_utils.locate("smalldata/junit/cars_20mpg.csv"))
# choose the type model-building exercise (multinomial classification or regression). 0:regression, 1:binomial,
# 2:multinomial
problem = random.sample(list(range(2)),1)[0] + 1 # only do classification
# pick the predictors and the correct response column
predictors = ["displacement","power","weight","acceleration","year"]
if problem == 1 :
response_col = "economy_20mpg"
cars[response_col] = cars[response_col].asfactor()
elif problem == 2 :
response_col = "cylinders"
cars[response_col] = cars[response_col].asfactor()
else :
response_col = "economy"
print("Response column: {0}".format(response_col))
## cross-validation
# 1. basic
dl = H2ODeepWaterEstimator(nfolds=random.randint(3,10),fold_assignment="Modulo",hidden=[20,20],epochs=10)
dl.train(x=predictors, y=response_col, training_frame=cars)
# 2. check that cv metrics are different over repeated "Random" runs
nfolds = random.randint(3,10)
dl1 = H2ODeepWaterEstimator(nfolds=nfolds,fold_assignment="Random",hidden=[20,20],epochs=10)
dl1.train(x=predictors,y=response_col,training_frame=cars)
dl2 = H2ODeepWaterEstimator(nfolds=nfolds,fold_assignment="Random",hidden=[20,20],epochs=10)
try:
pyunit_utils.check_models(dl1, dl2, True)
assert False, "Expected models to be different over repeated Random runs"
except AssertionError:
assert True
# 3. folds_column
num_folds = random.randint(2,5)
fold_assignments = h2o.H2OFrame([[random.randint(0,num_folds-1)] for _ in range(cars.nrow)])
fold_assignments.set_names(["fold_assignments"])
cars = cars.cbind(fold_assignments)
dl = H2ODeepWaterEstimator(keep_cross_validation_predictions=True,hidden=[20,20],epochs=10)
dl.train(x=predictors,y=response_col,training_frame=cars,fold_column="fold_assignments")
num_cv_models = len(dl._model_json['output']['cross_validation_models'])
assert num_cv_models==num_folds, "Expected {0} cross-validation models, but got " \
"{1}".format(num_folds, num_cv_models)
cv_model1 = h2o.get_model(dl._model_json['output']['cross_validation_models'][0]['name'])
cv_model2 = h2o.get_model(dl._model_json['output']['cross_validation_models'][1]['name'])
# 4. keep_cross_validation_predictions
cv_predictions = dl1._model_json['output']['cross_validation_predictions']
## boundary cases
# 1. nfolds = number of observations (leave-one-out cross-validation)
dl = H2ODeepWaterEstimator(nfolds=cars.nrow, fold_assignment="Modulo",hidden=[20,20],epochs=10)
dl.train(x=predictors,y=response_col,training_frame=cars)
# 2. nfolds = 0
dl = H2ODeepWaterEstimator(nfolds=0,hidden=[20,20],epochs=10)
dl.train(x=predictors,y=response_col,training_frame=cars)
# 3. cross-validation and regular validation attempted
dl = H2ODeepWaterEstimator(nfolds=random.randint(3,10),hidden=[20,20],epochs=10)
dl.train(x=predictors, y=response_col, training_frame=cars, validation_frame=cars)
## error cases
# 1. nfolds == 1 or < 0
try:
dl = H2ODeepWaterEstimator(nfolds=random.sample([-1,1], 1)[0],hidden=[20,20],epochs=10)
dl.train(x=predictors, y=response_col, training_frame=cars)
assert False, "Expected model-build to fail when nfolds is 1 or < 0"
except EnvironmentError:
assert True
# 2. more folds than observations
try:
dl = H2ODeepWaterEstimator(nfolds=cars.nrow+1,fold_assignment="Modulo",hidden=[20,20],epochs=10)
dl.train(x=predictors, y=response_col, training_frame=cars)
assert False, "Expected model-build to fail when nfolds > nobs"
except EnvironmentError:
assert True
# 3. fold_column and nfolds both specified
try:
dl = H2ODeepWaterEstimator(nfolds=3, hidden=[20, 20], epochs=10)
dl.train(x=predictors, y=response_col, fold_column="fold_assignments", training_frame=cars)
assert False, "Expected model-build to fail when fold_column and nfolds both specified"
except EnvironmentError:
assert True
def cv_carsGBM():
# read in the dataset and construct training set (and validation set)
cars = h2o.import_file(
path=pyunit_utils.locate("smalldata/junit/cars_20mpg.csv"))
# choose the type model-building exercise (multinomial classification or regression). 0:regression, 1:binomial,
# 2:multinomial
problem = random.sample(list(range(3)), 1)[0]
# pick the predictors and response column, along with the correct distribution
predictors = ["displacement", "power", "weight", "acceleration", "year"]
if problem == 1:
response_col = "economy_20mpg"
distribution = "bernoulli"
cars[response_col] = cars[response_col].asfactor()
elif problem == 2:
response_col = "cylinders"
distribution = "multinomial"
cars[response_col] = cars[response_col].asfactor()
else:
response_col = "economy"
distribution = "gaussian"
print("Distribution: {0}".format(distribution))
print("Response column: {0}".format(response_col))
## cross-validation
# 1. check that cv metrics are the same over repeated "Modulo" runs
nfolds = random.randint(3, 10)
gbm1 = h2o.gbm(y=cars[response_col],
x=cars[predictors],
nfolds=nfolds,
distribution=distribution,
ntrees=5,
fold_assignment="Modulo")
gbm2 = h2o.gbm(y=cars[response_col],
x=cars[predictors],
nfolds=nfolds,
distribution=distribution,
ntrees=5,
fold_assignment="Modulo")
pyunit_utils.check_models(gbm1, gbm2, True)
# 2. check that cv metrics are different over repeated "Random" runs
nfolds = random.randint(3, 10)
gbm1 = h2o.gbm(y=cars[response_col],
x=cars[predictors],
nfolds=nfolds,
distribution=distribution,
ntrees=5,
fold_assignment="Random")
gbm2 = h2o.gbm(y=cars[response_col],
x=cars[predictors],
nfolds=nfolds,
distribution=distribution,
ntrees=5,
fold_assignment="Random")
try:
pyunit_utils.check_models(gbm1, gbm2, True)
assert False, "Expected models to be different over repeated Random runs"
except AssertionError:
assert True
# 3. folds_column
num_folds = random.randint(2, 5)
fold_assignments = h2o.H2OFrame([[random.randint(0, num_folds - 1)]
for f in range(cars.nrow)])
fold_assignments.set_names(["fold_assignments"])
cars = cars.cbind(fold_assignments)
gbm = h2o.gbm(y=cars[response_col],
x=cars[predictors],
training_frame=cars,
distribution=distribution,
ntrees=5,
fold_column="fold_assignments",
keep_cross_validation_predictions=True)
num_cv_models = len(gbm._model_json['output']['cross_validation_models'])
assert num_cv_models==num_folds, "Expected {0} cross-validation models, but got " \
"{1}".format(num_folds, num_cv_models)
cv_model1 = h2o.get_model(
gbm._model_json['output']['cross_validation_models'][0]['name'])
cv_model2 = h2o.get_model(
gbm._model_json['output']['cross_validation_models'][1]['name'])
# 4. keep_cross_validation_predictions
cv_predictions = gbm1._model_json['output']['cross_validation_predictions']
assert cv_predictions is None, "Expected cross-validation predictions to be None, but got {0}".format(
cv_predictions)
cv_predictions = gbm._model_json['output']['cross_validation_predictions']
assert len(cv_predictions)==num_folds, "Expected the same number of cross-validation predictions " \
"as folds, but got {0}".format(len(cv_predictions))
# # 5. manually construct models
# fold1 = cars[cars["fold_assignments"]==0]
# fold2 = cars[cars["fold_assignments"]==1]
# manual_model1 = h2o.gbm(y=fold2[response_col],
# x=fold2[predictors],
# validation_y=fold1[response_col],
# validation_x=fold1[predictors], ntrees=5,
# distribution=distribution)
# manual_model2 = h2o.gbm(y=fold1[response_col],
# x=fold1[predictors],
# validation_y=fold2[response_col],
# validation_x=fold2[predictors], ntrees=5,
# distribution=distribution)
## boundary cases
# 1. nfolds = number of observations (leave-one-out cross-validation)
gbm = h2o.gbm(y=cars[response_col],
x=cars[predictors],
nfolds=cars.nrow,
distribution=distribution,
ntrees=5,
fold_assignment="Modulo")
# 2. nfolds = 0
gbm1 = h2o.gbm(y=cars[response_col],
x=cars[predictors],
nfolds=0,
distribution=distribution,
ntrees=5)
# check that this is equivalent to no nfolds
gbm2 = h2o.gbm(y=cars[response_col],
x=cars[predictors],
distribution=distribution,
ntrees=5)
pyunit_utils.check_models(gbm1, gbm2)
# 3. cross-validation and regular validation attempted
gbm = h2o.gbm(y=cars[response_col],
x=cars[predictors],
nfolds=random.randint(3, 10),
validation_y=cars[response_col],
ntrees=5,
validation_x=cars[predictors],
distribution=distribution)
## error cases
# 1. nfolds == 1 or < 0
try:
gbm = h2o.gbm(y=cars[response_col],
x=cars[predictors],
nfolds=random.sample([-1, 1], 1)[0],
ntrees=5,
distribution=distribution)
assert False, "Expected model-build to fail when nfolds is 1 or < 0"
except EnvironmentError:
assert True
# 2. more folds than observations
try:
gbm = h2o.gbm(y=cars[response_col],
x=cars[predictors],
nfolds=cars.nrow + 1,
distribution=distribution,
ntrees=5,
fold_assignment="Modulo")
assert False, "Expected model-build to fail when nfolds > nobs"
except EnvironmentError:
assert True
# 3. fold_column and nfolds both specified
try:
gbm = h2o.gbm(y=cars[response_col],
x=cars[predictors],
nfolds=3,
fold_column="fold_assignments",
ntrees=5,
distribution=distribution,
training_frame=cars)
assert False, "Expected model-build to fail when fold_column and nfolds both specified"
except EnvironmentError:
assert True
# 4. fold_column and fold_assignment both specified
try:
gbm = h2o.gbm(y=cars[response_col],
x=cars[predictors],
fold_assignment="Random",
fold_column="fold_assignments",
ntrees=5,
distribution=distribution,
training_frame=cars)
assert False, "Expected model-build to fail when fold_column and fold_assignment both specified"
except EnvironmentError:
assert True
def cv_cars_glm():
# read in the dataset and construct training set (and validation set)
cars = h2o.import_file(path=pyunit_utils.locate("smalldata/junit/cars_20mpg.csv"))
# choose the type model-building exercise (multinomial classification or regression). 0:regression, 1:binomial,
# 2:poisson
problem = random.sample(range(3),1)[0]
# pick the predictors and response column, along with the correct family
predictors = ["displacement","power","weight","acceleration","year"]
if problem == 1 :
response_col = "economy_20mpg"
family = "binomial"
cars[response_col] = cars[response_col].asfactor()
elif problem == 2 :
family = "poisson"
response_col = "cylinders"
else :
family = "gaussian"
response_col = "economy"
print "Distribution: {0}".format(family)
print "Response column: {0}".format(response_col)
## cross-validation
# 1. check that cv metrics are the same over repeated "Modulo" runs
nfolds = random.randint(3,10)
glm1 = H2OGeneralizedLinearEstimator(nfolds=nfolds, family=family, fold_assignment="Modulo")
glm1.train(x=predictors, y=response_col, training_frame=cars)
glm2 = H2OGeneralizedLinearEstimator(nfolds=nfolds, family=family, fold_assignment="Modulo")
glm2.train(x=predictors, y=response_col, training_frame=cars)
pyunit_utils.check_models(glm1, glm2, True)
# 2. check that cv metrics are different over repeated "Random" runs
nfolds = random.randint(3,10)
glm1 = H2OGeneralizedLinearEstimator(nfolds=nfolds, family=family, fold_assignment="Random")
glm1.train(x=predictors, y=response_col, training_frame=cars)
glm2 = H2OGeneralizedLinearEstimator(nfolds=nfolds, family=family, fold_assignment="Random")
glm2.train(x=predictors, y=response_col, training_frame=cars)
try:
pyunit_utils.check_models(glm1, glm2, True)
assert False, "Expected models to be different over repeated Random runs"
except AssertionError:
assert True
# 3. folds_column
num_folds = random.randint(2,5)
fold_assignments = h2o.H2OFrame(python_obj=[[random.randint(0,num_folds-1) for f in range(cars.nrow)]])
fold_assignments.set_names(["fold_assignments"])
cars = cars.cbind(fold_assignments)
glm = H2OGeneralizedLinearEstimator(family=family, keep_cross_validation_predictions=True)
glm.train(x=predictors, y=response_col, training_frame=cars, fold_column="fold_assignments")
num_cv_models = len(glm._model_json['output']['cross_validation_models'])
assert num_cv_models==num_folds, "Expected {0} cross-validation models, but got " \
"{1}".format(num_folds, num_cv_models)
cv_model1 = h2o.get_model(glm._model_json['output']['cross_validation_models'][0]['name'])
cv_model2 = h2o.get_model(glm._model_json['output']['cross_validation_models'][1]['name'])
# 4. keep_cross_validation_predictions
cv_predictions = glm1._model_json['output']['cross_validation_predictions']
assert cv_predictions is None, "Expected cross-validation predictions to be None, but got {0}".format(cv_predictions)
cv_predictions = glm._model_json['output']['cross_validation_predictions']
assert len(cv_predictions)==num_folds, "Expected the same number of cross-validation predictions " \
"as folds, but got {0}".format(len(cv_predictions))
# 2. nfolds = 0
glm1 = H2OGeneralizedLinearEstimator(nfolds=0, family=family)
glm1.train(x=predictors, y=response_col, training_frame=cars)
# check that this is equivalent to no nfolds
glm2 = H2OGeneralizedLinearEstimator(family=family)
glm2.train(x=predictors, y=response_col, training_frame=cars)
pyunit_utils.check_models(glm1, glm2)
# 3. cross-validation and regular validation attempted
glm = H2OGeneralizedLinearEstimator(nfolds=random.randint(3,10), family=family)
glm.train(x=predictors, y=response_col, training_frame=cars, validation_frame=cars)
## error cases
# 1. nfolds == 1 or < 0
try:
glm = H2OGeneralizedLinearEstimator(nfolds=random.sample([-1,1], 1)[0], family=family)
glm.train(x=predictors, y=response_col, training_frame=cars)
assert False, "Expected model-build to fail when nfolds is 1 or < 0"
except EnvironmentError:
assert True
# 2. more folds than observations
try:
glm = H2OGeneralizedLinearEstimator(nfolds=cars.nrow+1, family=family, fold_assignment="Modulo")
glm.train(x=predictors, y=response_col, training_frame=cars)
assert False, "Expected model-build to fail when nfolds > nobs"
except EnvironmentError:
assert True
# 3. fold_column and nfolds both specified
try:
glm = H2OGeneralizedLinearEstimator(nfolds=3, family=family)
glm.train(x=predictors, y=response_col, training_frame=cars, fold_column="fold_assignments")
assert False, "Expected model-build to fail when fold_column and nfolds both specified"
except EnvironmentError:
assert True
def cv_carsGBM():
# read in the dataset and construct training set (and validation set)
cars = h2o.import_file(path=pyunit_utils.locate("smalldata/junit/cars_20mpg.csv"))
# choose the type model-building exercise (multinomial classification or regression). 0:regression, 1:binomial,
# 2:multinomial
problem = random.sample(range(3),1)[0]
# pick the predictors and response column, along with the correct distribution
predictors = ["displacement","power","weight","acceleration","year"]
if problem == 1 :
response_col = "economy_20mpg"
distribution = "bernoulli"
cars[response_col] = cars[response_col].asfactor()
elif problem == 2 :
response_col = "cylinders"
distribution = "multinomial"
cars[response_col] = cars[response_col].asfactor()
else :
response_col = "economy"
distribution = "gaussian"
print "Distribution: {0}".format(distribution)
print "Response column: {0}".format(response_col)
## cross-validation
# 1. check that cv metrics are the same over repeated "Modulo" runs
nfolds = random.randint(3,10)
gbm1 = h2o.gbm(y=cars[response_col], x=cars[predictors], nfolds=nfolds, distribution=distribution, ntrees=5,
fold_assignment="Modulo")
gbm2 = h2o.gbm(y=cars[response_col], x=cars[predictors], nfolds=nfolds, distribution=distribution, ntrees=5,
fold_assignment="Modulo")
pyunit_utils.check_models(gbm1, gbm2, True)
# 2. check that cv metrics are different over repeated "Random" runs
nfolds = random.randint(3,10)
gbm1 = h2o.gbm(y=cars[response_col], x=cars[predictors], nfolds=nfolds, distribution=distribution, ntrees=5,
fold_assignment="Random")
gbm2 = h2o.gbm(y=cars[response_col], x=cars[predictors], nfolds=nfolds, distribution=distribution, ntrees=5,
fold_assignment="Random")
try:
pyunit_utils.check_models(gbm1, gbm2, True)
assert False, "Expected models to be different over repeated Random runs"
except AssertionError:
assert True
# 3. folds_column
num_folds = random.randint(2,5)
fold_assignments = h2o.H2OFrame(python_obj=[[random.randint(0,num_folds-1)] for f in range(cars.nrow)])
fold_assignments.set_names(["fold_assignments"])
cars = cars.cbind(fold_assignments)
gbm = h2o.gbm(y=cars[response_col], x=cars[predictors], training_frame=cars, distribution=distribution, ntrees=5,
fold_column="fold_assignments", keep_cross_validation_predictions=True)
num_cv_models = len(gbm._model_json['output']['cross_validation_models'])
assert num_cv_models==num_folds, "Expected {0} cross-validation models, but got " \
"{1}".format(num_folds, num_cv_models)
cv_model1 = h2o.get_model(gbm._model_json['output']['cross_validation_models'][0]['name'])
cv_model2 = h2o.get_model(gbm._model_json['output']['cross_validation_models'][1]['name'])
assert isinstance(cv_model1, type(gbm)), "Expected cross-validation model to be the same model type as the " \
"constructed model, but got {0} and {1}".format(type(cv_model1),type(gbm))
assert isinstance(cv_model2, type(gbm)), "Expected cross-validation model to be the same model type as the " \
"constructed model, but got {0} and {1}".format(type(cv_model2),type(gbm))
# 4. keep_cross_validation_predictions
cv_predictions = gbm1._model_json['output']['cross_validation_predictions']
assert cv_predictions is None, "Expected cross-validation predictions to be None, but got {0}".format(cv_predictions)
cv_predictions = gbm._model_json['output']['cross_validation_predictions']
assert len(cv_predictions)==num_folds, "Expected the same number of cross-validation predictions " \
"as folds, but got {0}".format(len(cv_predictions))
# # 5. manually construct models
# fold1 = cars[cars["fold_assignments"]==0]
# fold2 = cars[cars["fold_assignments"]==1]
# manual_model1 = h2o.gbm(y=fold2[response_col],
# x=fold2[predictors],
# validation_y=fold1[response_col],
# validation_x=fold1[predictors], ntrees=5,
# distribution=distribution)
# manual_model2 = h2o.gbm(y=fold1[response_col],
# x=fold1[predictors],
# validation_y=fold2[response_col],
# validation_x=fold2[predictors], ntrees=5,
# distribution=distribution)
## boundary cases
# 1. nfolds = number of observations (leave-one-out cross-validation)
gbm = h2o.gbm(y=cars[response_col], x=cars[predictors], nfolds=cars.nrow, distribution=distribution, ntrees=5,
fold_assignment="Modulo")
# 2. nfolds = 0
gbm1 = h2o.gbm(y=cars[response_col], x=cars[predictors], nfolds=0, distribution=distribution, ntrees=5)
# check that this is equivalent to no nfolds
gbm2 = h2o.gbm(y=cars[response_col], x=cars[predictors], distribution=distribution, ntrees=5)
pyunit_utils.check_models(gbm1, gbm2)
# 3. cross-validation and regular validation attempted
gbm = h2o.gbm(y=cars[response_col], x=cars[predictors], nfolds=random.randint(3,10), validation_y=cars[response_col], ntrees=5,
validation_x=cars[predictors], distribution=distribution)
## error cases
# 1. nfolds == 1 or < 0
try:
gbm = h2o.gbm(y=cars[response_col], x=cars[predictors], nfolds=random.sample([-1,1], 1)[0], ntrees=5,
distribution=distribution)
assert False, "Expected model-build to fail when nfolds is 1 or < 0"
except EnvironmentError:
assert True
# 2. more folds than observations
try:
gbm = h2o.gbm(y=cars[response_col], x=cars[predictors], nfolds=cars.nrow+1, distribution=distribution, ntrees=5,
fold_assignment="Modulo")
assert False, "Expected model-build to fail when nfolds > nobs"
except EnvironmentError:
assert True
# 3. fold_column and nfolds both specified
try:
gbm = h2o.gbm(y=cars[response_col], x=cars[predictors], nfolds=3, fold_column="fold_assignments", ntrees=5,
distribution=distribution, training_frame=cars)
assert False, "Expected model-build to fail when fold_column and nfolds both specified"
except EnvironmentError:
assert True
# 4. fold_column and fold_assignment both specified
try:
gbm = h2o.gbm(y=cars[response_col], x=cars[predictors], fold_assignment="Random", fold_column="fold_assignments", ntrees=5,
distribution=distribution, training_frame=cars)
assert False, "Expected model-build to fail when fold_column and fold_assignment both specified"
except EnvironmentError:
assert True
def cv_carsDL():
# read in the dataset and construct training set (and validation set)
cars = h2o.import_file(
path=pyunit_utils.locate("smalldata/junit/cars_20mpg.csv"))
# choose the type model-building exercise (multinomial classification or regression). 0:regression, 1:binomial,
# 2:multinomial
problem = random.sample(range(3), 1)[0]
# pick the predictors and the correct response column
predictors = ["displacement", "power", "weight", "acceleration", "year"]
if problem == 1:
response_col = "economy_20mpg"
cars[response_col] = cars[response_col].asfactor()
elif problem == 2:
response_col = "cylinders"
cars[response_col] = cars[response_col].asfactor()
else:
response_col = "economy"
print "Response column: {0}".format(response_col)
## cross-validation
# 1. basic
dl = h2o.deeplearning(y=cars[response_col],
x=cars[predictors],
nfolds=random.randint(3, 10),
fold_assignment="Modulo")
# 2. check that cv metrics are different over repeated "Random" runs
nfolds = random.randint(3, 10)
dl1 = h2o.deeplearning(y=cars[response_col],
x=cars[predictors],
nfolds=nfolds,
fold_assignment="Random")
dl2 = h2o.deeplearning(y=cars[response_col],
x=cars[predictors],
nfolds=nfolds,
fold_assignment="Random")
try:
pyunit_utils.check_models(dl1, dl2, True)
assert False, "Expected models to be different over repeated Random runs"
except AssertionError:
assert True
# 3. folds_column
num_folds = random.randint(2, 5)
fold_assignments = h2o.H2OFrame(
zip(*[[random.randint(0, num_folds - 1)] for f in range(cars.nrow)]))
fold_assignments.set_names(["fold_assignments"])
cars = cars.cbind(fold_assignments)
dl = h2o.deeplearning(y=cars[response_col],
x=cars[predictors],
training_frame=cars,
fold_column="fold_assignments",
keep_cross_validation_predictions=True)
num_cv_models = len(dl._model_json['output']['cross_validation_models'])
assert num_cv_models==num_folds, "Expected {0} cross-validation models, but got " \
"{1}".format(num_folds, num_cv_models)
cv_model1 = h2o.get_model(
dl._model_json['output']['cross_validation_models'][0]['name'])
cv_model2 = h2o.get_model(
dl._model_json['output']['cross_validation_models'][1]['name'])
assert isinstance(cv_model1, type(dl)), "Expected cross-validation model to be the same model type as the " \
"constructed model, but got {0} and {1}".format(type(cv_model1),type(dl))
assert isinstance(cv_model2, type(dl)), "Expected cross-validation model to be the same model type as the " \
"constructed model, but got {0} and {1}".format(type(cv_model2),type(dl))
# 4. keep_cross_validation_predictions
cv_predictions = dl1._model_json['output']['cross_validation_predictions']
assert cv_predictions is None, "Expected cross-validation predictions to be None, but got {0}".format(
cv_predictions)
cv_predictions = dl._model_json['output']['cross_validation_predictions']
assert len(cv_predictions)==num_folds, "Expected the same number of cross-validation predictions " \
"as folds, but got {0}".format(len(cv_predictions))
## boundary cases
# 1. nfolds = number of observations (leave-one-out cross-validation)
dl = h2o.deeplearning(y=cars[response_col],
x=cars[predictors],
nfolds=cars.nrow,
fold_assignment="Modulo")
# 2. nfolds = 0
dl = h2o.deeplearning(y=cars[response_col], x=cars[predictors], nfolds=0)
# 3. cross-validation and regular validation attempted
dl = h2o.deeplearning(y=cars[response_col],
x=cars[predictors],
nfolds=random.randint(3, 10),
validation_y=cars[response_col],
validation_x=cars[predictors])
## error cases
# 1. nfolds == 1 or < 0
try:
dl = h2o.deeplearning(y=cars[response_col],
x=cars[predictors],
nfolds=random.sample([-1, 1], 1)[0])
assert False, "Expected model-build to fail when nfolds is 1 or < 0"
except EnvironmentError:
assert True
# 2. more folds than observations
try:
dl = h2o.deeplearning(y=cars[response_col],
x=cars[predictors],
nfolds=cars.nrow + 1,
fold_assignment="Modulo")
assert False, "Expected model-build to fail when nfolds > nobs"
except EnvironmentError:
assert True
# 3. fold_column and nfolds both specified
try:
rf = h2o.deeplearning(y=cars[response_col],
x=cars[predictors],
nfolds=3,
fold_column="fold_assignments",
training_frame=cars)
assert False, "Expected model-build to fail when fold_column and nfolds both specified"
except EnvironmentError:
assert True
