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# Start and connect to a local H2O cluster
import h2o
h2o.init(nthreads = -1)
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# Import Titanic data (local CSV)
titanic = h2o.import_file("kaggle_titanic.csv")
titanic.head(5)
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# Convert 'Survived' and 'Pclass' to categorical values
titanic['Survived'] = titanic['Survived'].asfactor()
titanic['Pclass'] = titanic['Pclass'].asfactor()
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titanic['Survived'].table()
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titanic['Pclass'].table()
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titanic['Sex'].table()
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titanic['Age'].hist()
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titanic['SibSp'].hist()
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titanic['Parch'].hist()
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titanic['Fare'].hist()
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titanic['Embarked'].table()
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# Define features (or predictors) manually
features = ['Pclass', 'Sex', 'Age', 'SibSp', 'Parch', 'Fare', 'Embarked']
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# Split the H2O data frame into training/test sets
# so we can evaluate out-of-bag performance
titanic_split = titanic.split_frame(ratios = [0.8], seed = 1234)
titanic_train = titanic_split[0] # using 80% for training
titanic_test = titanic_split[1] # using the rest 20% for out-of-bag evaluation
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titanic_train.shape
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titanic_test.shape
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# Build a Generalized Linear Model (GLM) with default settings
# Import the function for GLM
from h2o.estimators.glm import H2OGeneralizedLinearEstimator
# Set up GLM for binary classification
glm_default = H2OGeneralizedLinearEstimator(family = 'binomial', model_id = 'glm_default')
# Use .train() to build the model
glm_default.train(x = features,
y = 'Survived',
training_frame = titanic_train)
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# Check the model performance on training dataset
glm_default
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# Check the model performance on test dataset
glm_default.model_performance(titanic_test)
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# Build a Distributed Random Forest (DRF) model with default settings
# Import the function for DRF
from h2o.estimators.random_forest import H2ORandomForestEstimator
# Set up DRF for regression
# Add a seed for reproducibility
drf_default = H2ORandomForestEstimator(model_id = 'drf_default', seed = 1234)
# Use .train() to build the model
drf_default.train(x = features,
y = 'quality',
training_frame = wine_train)
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# Check the DRF model summary
drf_default
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# Check the model performance on test dataset
drf_default.model_performance(wine_test)
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# Build a Gradient Boosting Machines (GBM) model with default settings
# Import the function for GBM
from h2o.estimators.gbm import H2OGradientBoostingEstimator
# Set up GBM for regression
# Add a seed for reproducibility
gbm_default = H2OGradientBoostingEstimator(model_id = 'gbm_default', seed = 1234)
# Use .train() to build the model
gbm_default.train(x = features,
y = 'quality',
training_frame = wine_train)
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# Check the GBM model summary
gbm_default
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# Check the model performance on test dataset
gbm_default.model_performance(wine_test)
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# Build a Deep Learning (Deep Neural Networks, DNN) model with default settings
# Import the function for DNN
from h2o.estimators.deeplearning import H2ODeepLearningEstimator
# Set up DNN for regression
dnn_default = H2ODeepLearningEstimator(model_id = 'dnn_default')
# (not run) Change 'reproducible' to True if you want to reproduce the results
# The model will be built using a single thread (could be very slow)
# dnn_default = H2ODeepLearningEstimator(model_id = 'dnn_default', reproducible = True)
# Use .train() to build the model
dnn_default.train(x = features,
y = 'quality',
training_frame = wine_train)
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# Check the DNN model summary
dnn_default
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# Check the model performance on test dataset
dnn_default.model_performance(wine_test)
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# Use GLM model to make predictions
yhat_test_glm = glm_default.predict(wine_test)
yhat_test_glm.head(5)
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# Use DRF model to make predictions
yhat_test_drf = drf_default.predict(wine_test)
yhat_test_drf.head(5)
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# Use GBM model to make predictions
yhat_test_gbm = gbm_default.predict(wine_test)
yhat_test_gbm.head(5)
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# Use DNN model to make predictions
yhat_test_dnn = dnn_default.predict(wine_test)
yhat_test_dnn.head(5)
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