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How to implement pipeline architecture for regression in spark with R?
Description

To implement pipeline architecture for regression in spark with R using sparklyR package

Functions used :

spark_connect(master = “local”) – To create a spark connection
sdf_copy_to(spark_connection,R object,name) – To copy data to spark environment
sdf_partition(spark_dataframe,partitions with weights,seed) – To partition spark dataframe into multiple groups
ml_pipeline(spark connection) – To create a Spark ML pipeline
ft_r_formula(formula) – To implement the transforms required for fititng a dataset against an R model formula
ml_linear_regression() – To build a linear regression model
ml_fit(pipeline_model,train_data) – To fit the model
ml_transform(fitted_pipeline,test_data) – To predict the test data

Process
  • Load the sparklyr library
  • Create a spark connection
  • Copy data to spark environment
  • Split the data for train and test
  • Create an empty pipeline model
  • Fit the pipeline model using the train data
  • Predict using the test data
  • Evaluate the metrics
Sapmle Code

#Load the sparklyr library
library(sparklyr)
#Create a spark connection
sc %
ft_r_formula(Class~.) %>%
ml_linear_regression()
#Split the data for train and test
partitions=sdf_partition(data_s,training=0.8,test=0.2,seed=111)
train_data=partitions$training
test_data=partitions$test
#Fit the pipeline model
fitted_pipeline fitted_pipeline
#Predict using the test data
predictions predictions
#Evaluate the metrics
#Default RMSE(Root Mean Square Error)
cat(“Root Mean Squared Error : “,ml_regression_evaluator(predictions, label_col = “Class”,prediction_col = “prediction”))
cat(“\nMean Squared Error : “,ml_regression_evaluator(predictions, label_col = “Class”,prediction_col = “prediction”,metric_name = “mse”))
cat(“\nR-Squared : “,ml_regression_evaluator(predictions, label_col = “Class”,prediction_col = “prediction”,metric_name = “r2”))
cat(“\nMean Absolute Error : “,ml_regression_evaluator(predictions, label_col = “Class”,prediction_col = “prediction”,metric_name = “mae”))

Screenshots