y¶

Description¶

Use this option to specify a response column (y-axis). The response column is the column that you are attempting to predict. For example, based on a set of parameters in a training dataset, will a new customber be more or less likely to purchase a product? Or based on some known variables, what is the likelihood that a flight will be delayed? In both cases, a model can be applied to a training frame and to a validation frame to predict the likely response.

Response columns can be numeric or categorical, and they can be binomial or multiomial. If you are specifying a distribution type in DL or GBM, however, then keep in mind the following when defining a response column:

• If the distribution is bernoulli, the the response column must be 2-class categorical
• If the distribution is multinomial, the response column must be categorical.
• If the distribution is poisson, the response column must be numeric.
• If the distribution is laplace, the response column must be numeric.
• If the distribution is tweedie, the response column must be numeric.
• If the distribution is gaussian, the response column must be numeric.
• If the distribution is huber, the response column must be numeric.
• If the distribution is gamma, the response column must be numeric.
• If the distribution is quantile, the response column must be numeric.

Notes:

• The response column cannot be the same as the fold_column.
• For supervised learning, the response column cannot be the same as the weights_column, and the response column must exist in both the training frame and in the validation frame.

Related Parameters¶

• distribution
• offset_column
• weights_column

Example¶

library(h2o)
h2o.init()

# import the cars dataset:
# this dataset is used to classify whether or not a car is economical based on
# the car's displacement, power, weight, and acceleration, and the year it was made
cars <- h2o.importFile("https://s3.amazonaws.com/h2o-public-test-data/smalldata/junit/cars_20mpg.csv")

# convert response column to a factor
cars["economy_20mpg"] <- as.factor(cars["economy_20mpg"])

# set the predictor names and the response column name
predictors <- c("displacement","power","weight","acceleration","year")
response <- "economy_20mpg"

# split into train and validation sets
cars.split <- h2o.splitFrame(data = cars,ratios = 0.8, seed = 1234)
train <- cars.split[[1]]
valid <- cars.split[[2]]

# try using the `y` parameter:
# train your model, where you specify your 'x' predictors, your 'y' the response column
# training_frame and validation_frame
cars_gbm <- h2o.gbm(x = predictors, y = response, training_frame = train,
                    validation_frame = valid, seed = 1234)

# print the auc for your model
print(h2o.auc(cars_gbm, valid = TRUE))

import h2o
from h2o.estimators.gbm import H2OGradientBoostingEstimator
h2o.init()
h2o.cluster().show_status()

# import the cars dataset:
# this dataset is used to classify whether or not a car is economical based on
# the car's displacement, power, weight, and acceleration, and the year it was made
cars = h2o.import_file("https://s3.amazonaws.com/h2o-public-test-data/smalldata/junit/cars_20mpg.csv")

# convert response column to a factor
cars["economy_20mpg"] = cars["economy_20mpg"].asfactor()

# set the predictor names and the response column name
predictors = ["displacement","power","weight","acceleration","year"]
response = "economy_20mpg"

# split into train and validation sets
train, valid = cars.split_frame(ratios = [.8], seed = 1234)

# try using the `y` parameter:
# first initialize your estimator
cars_gbm = H2OGradientBoostingEstimator(seed = 1234)

# then train your model, where you specify your 'x' predictors, your 'y' the response column
# training_frame and validation_frame
cars_gbm.train(x = predictors, y = response, training_frame = train, validation_frame = valid)

# print the auc for the validation data
cars_gbm.auc(valid=True)