Import libraries for gbt classifier

import pyspark
from pyspark.ml.classification import GBTClassifier
from pyspark.ml.feature import StringIndexer, VectorAssembler
from pyspark.sql import SparkSession
from pyspark.ml import Pipeline
from pyspark.ml.feature import StandardScaler
from pyspark.ml.evaluation import BinaryClassificationEvaluator
spark = SparkSession.builder.appName("Gradient Boosted Tree Classifier").getOrCreate()