The estimator algorithm

An estimator is another algorithm that can produce a transformer by fitting on a DataFrame. For instance, a learning algorithm can train on a dataset and produce a model. This produces a transformer by learning an algorithm. It uses the fit() method to produce a transformer. For instance, the Na?ve Bayes learning algorithm is an estimator that calls the fit() method and trains a Na?ve Bayes model, which is a transformer. We will use the following code to train the model:

import org.apache.spark.ml.classification.NaiveBayes

val nb = new NaiveBayes().setModelType("multinomial")

val model = nb.fit(Training_DataDF)