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To implement logistic regression for multiclass in spark with R using SparklyR package
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_logistic_regression(train_data,formula) – To build a logistic regression model
ml_predict(ml_model,test_data) – To predict the response for the test data
ml_multiclass_classification_evaluator(predict, label_col = “label”,prediction_col = “prediction”) – To evaluate the metrics(f1(default),accuracy,weighted precision,weighted recall)
#Load the sparklyr library
library(sparklyr)
library(caret)
#Create a spark connection
sc #Copy data to spark environment
data_s=sdf_copy_to(sc,read.csv(“…/iris.csv”),”iris”,overwrite= TRUE)
#Split the data for training and testing
partitions=sdf_partition(data_s,training=0.8,test=0.2,seed=111)
train_data=partitions$training
test_data=partitions$test
#Build the logistic regression model
log_model summary(log_model)
#Predict using the test data
prediction = ml_predict(log_model, test_data)
prediction
#Evaluate the metrics(default = F1)
cat(“F1 : “,ml_multiclass_classification_evaluator(prediction, label_col = “label”,
prediction_col = “prediction”))
cat(“\nAccuracy : “,ml_multiclass_classification_evaluator(prediction, label_col = “label”,
prediction_col = “prediction”,metric_name=”accuracy”))
cat(“\nPrecision : “,ml_multiclass_classification_evaluator(prediction, label_col = “label”,
prediction_col = “prediction”,metric_name=”weightedPrecision”))
cat(“\nRecall : “,ml_multiclass_classification_evaluator(prediction, label_col = “label”,
prediction_col = “prediction”,metric_name=”weightedRecall”))
