spark-sklearn TypeError: 'JavaPackage' object is not callable

from sklearn imports SVM, datasets
from spark_sklearn imports GridSearchCV
from pyspark imports SparkContext, SparkConf

iris = datasets.load_iris()
parameters = {'kernel':('linear', 'rbf'), 'C':[1, 10]}
svr = svm.SVC(gamma='auto')
conf = SparkConf().setAppName('pysk').setMaster('local')
sc = SparkContext(conf=conf)
clf = GridSearchCV(sc, svr, parameters)
clf.fit(iris.data, iris.target)

spark-sklearn being given sc = SparkContext (conf = conf) at 'JavaPackage' object is not callable, after inspection is caused by excessive release pyspark .