from java.io import FileReader
from weka.core import Instances
from java.util import Random
from weka.classifiers.trees import M5P
from weka.classifiers import Evaluation
from jhplot import Web

# load data
xf="bolts.arff"
url="https://datamelt.org/examples/data/weka/regression/"+xf
print "Loading ",xf
print Web.get(url)

data = Instances(FileReader(xf))
data.setClassIndex(data.numAttributes() - 1)

cls = M5P()
xval = Evaluation(data);
xval.crossValidateModel(cls, data, 10, Random(1))
print xval.toSummaryString()