def evaluate_dt(train,test,maxDepth,maxBins):
model = DecisionTree.trainRegressor(train,{},impurity = 'variance',maxDepth = maxDepth,maxBins = maxBins)
preds = model.predict(test.map(lambda p:p.features))
actual = test.map(lambda p:p.label)
tp = actual.zip(preds)
rmsle = np.sqrt(tp.map(lambda (t,p):squared_log_error(t,p)).mean())
return rmsle
def trainClassifier(self):
# get the current time
current = time()
# get the tags
tags = self.tags
numeric = self.numeric
x = self.x
y = self.y
# get the training data
training_data = self.training_labeled
# start training the tree model
self.tree_model = DecisionTree.trainClassifier(
training_data,
numClasses=4,
categoricalFeaturesInfo={0 : len(tags), 1 : len(numeric), 2 : len(x), 3 : len(y)},
impurity="gini",
maxDepth=5,
maxBins=1000)
print self.tree_model
# total time
total = time() - current
print "Classifier trained in {} seconds.".format(round(total, 3))
# start evaluating the model
self.evaluate()
def main():
sc = SparkContext(appName="MyApp")
sc.setLogLevel('ERROR')
# Parse data
train_labels, train_data = load_data('train.csv')
dummy_labels, test_data = load_data('test.csv', use_labels=False)
# Map each data point's label to its features
train_set = reformatData(train_data, train_labels)
test_set = reformatData(test_data, dummy_labels)
# Parallelize the data
parallelized_train_set = sc.parallelize(train_set)
parallelized_test_set = sc.parallelize(test_set)
# Split the data
trainSet, validationSet = parallelized_train_set.randomSplit([1.0, 0.0], seed=42)
# Train the models
decisionTreeModel = DecisionTree.trainClassifier(trainSet, numClasses=5, categoricalFeaturesInfo={},
impurity='gini', maxBins=55, maxDepth=30, minInstancesPerNode=2)
# Test the model
testDecisionTree(decisionTreeModel, parallelized_test_set)
def generateDecisionTree():
if os.path.exists(DT_PATH):
print("DT_PATH Already available")
return
global model
data = sc.textFile(F_PATH).map(parseLine)
(trainingData, testData) = data.randomSplit([0.9, 0.1], seed=1L)
model = DecisionTree.trainClassifier(trainingData, numClasses=classes.__len__(), categoricalFeaturesInfo={},
impurity='gini', maxDepth=5, maxBins=32)
# Evaluate model on test instances and compute test error
predictions = model.predict(testData.map(lambda x: x.features))
labelsAndPredictions = testData.map(lambda lp: lp.label).zip(predictions)
testErr = labelsAndPredictions.filter(lambda (v, p): v != p).count() / float(testData.count())
print('Test Error = ', str(testErr))
print('Learned classification tree model:')
print(model.toDebugString())
modelStatistics(labelsAndPredictions)
# Save and load model
model.save(sc, DT_PATH)
print("Decision Tree model saved!")
def decisionTree(trainingRDD, trainingRDDHashed, testRDDHashed, testRDD):
# Get size of RDD
nFilesV = trainingRDDHashed.count()
nFilesT = testRDDHashed.count()
# Train the Decision Tree Model
trainedModel = DecisionTree.trainClassifier(
trainingRDD,
numClasses=2,
categoricalFeaturesInfo={},
impurity='gini',
maxDepth=2,
maxBins=3)
# Test the Model on the Training Set
predictions = trainedModel.predict(trainingRDD.map(lambda x: x.features))
labelsAndPredictions = trainingRDD.map(
lambda lp: lp.label).zip(predictions).countByValue()
# Map to Dictionary for obtaining Results
resultsValidation = defaultdict(lambda: 0, labelsAndPredictions)
nFilesV = trainingRDDHashed.count()
nFilesT = testRDDHashed.count()
# Get F-Score and Accuracy Value
AccuracyV, fScoreV = getAccuracy(resultsValidation, nFilesV)
# Test the Model on the Test Set
predictions = trainedModel.predict(testRDD.map(lambda x: x.features))
labelsAndPredictions = testRDD.map(
lambda lp: lp.label).zip(predictions).countByValue()
# Map to Dictionary for obtaining Results
resultsTest = defaultdict(lambda: 0, labelsAndPredictions)
AccuracyT, fScoreT = getAccuracy(resultsTest, nFilesT)
# Print Results
print(' Results for Decision Tree')
print(' Training Set: %.3f and F-Score: %.3f') % (AccuracyV, fScoreV)
print(' Test Set: %.3f and F-Score: %.3f') % (AccuracyT, fScoreT)
# Return the Result List
return AccuracyV, fScoreV, AccuracyT, fScoreT
def test_regression(self):
from pyspark.mllib.regression import LinearRegressionWithSGD, LassoWithSGD, \
RidgeRegressionWithSGD
from pyspark.mllib.tree import DecisionTree, RandomForest, GradientBoostedTrees
data = [
LabeledPoint(-1.0, [0, -1]),
LabeledPoint(1.0, [0, 1]),
LabeledPoint(-1.0, [0, -2]),
LabeledPoint(1.0, [0, 2])
]
rdd = self.sc.parallelize(data)
features = [p.features.tolist() for p in data]
lr_model = LinearRegressionWithSGD.train(rdd, iterations=10)
self.assertTrue(lr_model.predict(features[0]) <= 0)
self.assertTrue(lr_model.predict(features[1]) > 0)
self.assertTrue(lr_model.predict(features[2]) <= 0)
self.assertTrue(lr_model.predict(features[3]) > 0)
lasso_model = LassoWithSGD.train(rdd, iterations=10)
self.assertTrue(lasso_model.predict(features[0]) <= 0)
self.assertTrue(lasso_model.predict(features[1]) > 0)
self.assertTrue(lasso_model.predict(features[2]) <= 0)
self.assertTrue(lasso_model.predict(features[3]) > 0)
rr_model = RidgeRegressionWithSGD.train(rdd, iterations=10)
self.assertTrue(rr_model.predict(features[0]) <= 0)
self.assertTrue(rr_model.predict(features[1]) > 0)
self.assertTrue(rr_model.predict(features[2]) <= 0)
self.assertTrue(rr_model.predict(features[3]) > 0)
categoricalFeaturesInfo = {0: 2} # feature 0 has 2 categories
dt_model = DecisionTree.trainRegressor(
rdd, categoricalFeaturesInfo=categoricalFeaturesInfo, maxBins=4)
self.assertTrue(dt_model.predict(features[0]) <= 0)
self.assertTrue(dt_model.predict(features[1]) > 0)
self.assertTrue(dt_model.predict(features[2]) <= 0)
self.assertTrue(dt_model.predict(features[3]) > 0)
rf_model = RandomForest.trainRegressor(
rdd, categoricalFeaturesInfo=categoricalFeaturesInfo, numTrees=10, maxBins=4, seed=1)
self.assertTrue(rf_model.predict(features[0]) <= 0)
self.assertTrue(rf_model.predict(features[1]) > 0)
self.assertTrue(rf_model.predict(features[2]) <= 0)
self.assertTrue(rf_model.predict(features[3]) > 0)
gbt_model = GradientBoostedTrees.trainRegressor(
rdd, categoricalFeaturesInfo=categoricalFeaturesInfo, numIterations=4)
self.assertTrue(gbt_model.predict(features[0]) <= 0)
self.assertTrue(gbt_model.predict(features[1]) > 0)
self.assertTrue(gbt_model.predict(features[2]) <= 0)
self.assertTrue(gbt_model.predict(features[3]) > 0)
try:
LinearRegressionWithSGD.train(rdd, initialWeights=array([1.0, 1.0]), iterations=10)
LassoWithSGD.train(rdd, initialWeights=array([1.0, 1.0]), iterations=10)
RidgeRegressionWithSGD.train(rdd, initialWeights=array([1.0, 1.0]), iterations=10)
except ValueError:
self.fail()
def trainModel(trainingData):
print '\nTraining Decision Tree model started'
Utils.logTime()
model = DecisionTree.trainClassifier(trainingData, numClasses=2, categoricalFeaturesInfo={}, impurity='gini', maxDepth=5,maxBins=32)
print '\nTraining Decision Tree model finished'
Utils.logTime()
return model
def RunDecisionTree(tf):
rdd = tf.map(parseAsLabeledPoints)
train, test = rdd.randomSplit([.8, .2])
model = DecisionTree.trainClassifier(train, numClasses=numCat, categoricalFeaturesInfo={},impurity='gini', maxDepth=5, maxBins=100)
predictions = model.predict(train.map(lambda x: x.features))
labelsAndPredictions = train.map(lambda lp: lp.label).zip(predictions)
trainErr = labelsAndPredictions.filter(lambda (v, p): v != p).count() / float(test.count())
print('Training Error = ' + str(trainErr))
def train(self, num_classes=2, categorical_features=None, max_depth=5):
categorical_features = categorical_features or {}
model = DecisionTree.trainClassifier(
self._labeled_feature_vector_rdd(),
numClasses=num_classes,
categoricalFeaturesInfo=categorical_features,
maxDepth=max_depth)
return DecisionTreeModel(model, self.feature_cols)
def RunDecisionTree(tf):
rdd = tf.map(parseAsLabeledPoints)
train, test = rdd.randomSplit([.8, .2])
numCat = len(genCats)
model = DecisionTree.trainClassifier(train, numClasses=numCat, categoricalFeaturesInfo={},
impurity='gini', maxDepth=5, maxBins=100)
# Evaluate model on training instances and compute training error
predictions = model.predict(test.map(lambda x: x.features))
labelsAndPredictions = test.map(lambda lp: lp.label).zip(predictions)
trainErr = labelsAndPredictions.filter(lambda (v, p): v != p).count() / float(test.count())
print('Accuracy of decision tree = ', 1-trainErr)
print('Training Error = ' + str(trainErr))
def test_regression(self):
from pyspark.mllib.regression import LinearRegressionWithSGD, LassoWithSGD, \
RidgeRegressionWithSGD
from pyspark.mllib.tree import DecisionTree, RandomForest, GradientBoostedTrees
data = [
LabeledPoint(-1.0, [0, -1]),
LabeledPoint(1.0, [0, 1]),
LabeledPoint(-1.0, [0, -2]),
LabeledPoint(1.0, [0, 2])
]
rdd = self.sc.parallelize(data)
features = [p.features.tolist() for p in data]
lr_model = LinearRegressionWithSGD.train(rdd)
self.assertTrue(lr_model.predict(features[0]) <= 0)
self.assertTrue(lr_model.predict(features[1]) > 0)
self.assertTrue(lr_model.predict(features[2]) <= 0)
self.assertTrue(lr_model.predict(features[3]) > 0)
lasso_model = LassoWithSGD.train(rdd)
self.assertTrue(lasso_model.predict(features[0]) <= 0)
self.assertTrue(lasso_model.predict(features[1]) > 0)
self.assertTrue(lasso_model.predict(features[2]) <= 0)
self.assertTrue(lasso_model.predict(features[3]) > 0)
rr_model = RidgeRegressionWithSGD.train(rdd)
self.assertTrue(rr_model.predict(features[0]) <= 0)
self.assertTrue(rr_model.predict(features[1]) > 0)
self.assertTrue(rr_model.predict(features[2]) <= 0)
self.assertTrue(rr_model.predict(features[3]) > 0)
categoricalFeaturesInfo = {0: 2} # feature 0 has 2 categories
dt_model = DecisionTree.trainRegressor(
rdd, categoricalFeaturesInfo=categoricalFeaturesInfo)
self.assertTrue(dt_model.predict(features[0]) <= 0)
self.assertTrue(dt_model.predict(features[1]) > 0)
self.assertTrue(dt_model.predict(features[2]) <= 0)
self.assertTrue(dt_model.predict(features[3]) > 0)
rf_model = RandomForest.trainRegressor(
rdd, categoricalFeaturesInfo=categoricalFeaturesInfo, numTrees=100)
self.assertTrue(rf_model.predict(features[0]) <= 0)
self.assertTrue(rf_model.predict(features[1]) > 0)
self.assertTrue(rf_model.predict(features[2]) <= 0)
self.assertTrue(rf_model.predict(features[3]) > 0)
gbt_model = GradientBoostedTrees.trainRegressor(
rdd, categoricalFeaturesInfo=categoricalFeaturesInfo)
self.assertTrue(gbt_model.predict(features[0]) <= 0)
self.assertTrue(gbt_model.predict(features[1]) > 0)
self.assertTrue(gbt_model.predict(features[2]) <= 0)
self.assertTrue(gbt_model.predict(features[3]) > 0)
def test_classification(self):
from pyspark.mllib.classification import LogisticRegressionWithSGD, SVMWithSGD, NaiveBayes
from pyspark.mllib.tree import DecisionTree, RandomForest, GradientBoostedTrees
data = [
LabeledPoint(0.0, [1, 0, 0]),
LabeledPoint(1.0, [0, 1, 1]),
LabeledPoint(0.0, [2, 0, 0]),
LabeledPoint(1.0, [0, 2, 1])
]
rdd = self.sc.parallelize(data)
features = [p.features.tolist() for p in data]
lr_model = LogisticRegressionWithSGD.train(rdd)
self.assertTrue(lr_model.predict(features[0]) <= 0)
self.assertTrue(lr_model.predict(features[1]) > 0)
self.assertTrue(lr_model.predict(features[2]) <= 0)
self.assertTrue(lr_model.predict(features[3]) > 0)
svm_model = SVMWithSGD.train(rdd)
self.assertTrue(svm_model.predict(features[0]) <= 0)
self.assertTrue(svm_model.predict(features[1]) > 0)
self.assertTrue(svm_model.predict(features[2]) <= 0)
self.assertTrue(svm_model.predict(features[3]) > 0)
nb_model = NaiveBayes.train(rdd)
self.assertTrue(nb_model.predict(features[0]) <= 0)
self.assertTrue(nb_model.predict(features[1]) > 0)
self.assertTrue(nb_model.predict(features[2]) <= 0)
self.assertTrue(nb_model.predict(features[3]) > 0)
categoricalFeaturesInfo = {0: 3} # feature 0 has 3 categories
dt_model = DecisionTree.trainClassifier(
rdd, numClasses=2, categoricalFeaturesInfo=categoricalFeaturesInfo)
self.assertTrue(dt_model.predict(features[0]) <= 0)
self.assertTrue(dt_model.predict(features[1]) > 0)
self.assertTrue(dt_model.predict(features[2]) <= 0)
self.assertTrue(dt_model.predict(features[3]) > 0)
rf_model = RandomForest.trainClassifier(
rdd, numClasses=2, categoricalFeaturesInfo=categoricalFeaturesInfo, numTrees=100)
self.assertTrue(rf_model.predict(features[0]) <= 0)
self.assertTrue(rf_model.predict(features[1]) > 0)
self.assertTrue(rf_model.predict(features[2]) <= 0)
self.assertTrue(rf_model.predict(features[3]) > 0)
gbt_model = GradientBoostedTrees.trainClassifier(
rdd, categoricalFeaturesInfo=categoricalFeaturesInfo)
self.assertTrue(gbt_model.predict(features[0]) <= 0)
self.assertTrue(gbt_model.predict(features[1]) > 0)
self.assertTrue(gbt_model.predict(features[2]) <= 0)
self.assertTrue(gbt_model.predict(features[3]) > 0)
def regression(sc, sample):
traindata = sc.parallelize(sample)
traindata = traindata.map(lambda x:LabeledPoint(x[1],x[0]))
testdata = [8.2]
#####
# linear_model = LinearRegressionWithSGD.train(traindata,iterations=10)
# prediction = linear_model.predict(testdata)
# print prediction
#####
decision_model = DecisionTree.trainRegressor(traindata,{})
prediction = decision_model.predict(testdata)
print prediction
def DecisionTreeProcess(trainingSet, testSet, imp, dtMaxDepth, dtMaxBins):
decisionTreeModel = DecisionTree.trainClassifier(trainingSet, numClasses = 4,categoricalFeaturesInfo={},
impurity=imp,maxDepth=dtMaxDepth, maxBins=dtMaxBins)
predictions = decisionTreeModel.predict(trainingSet.map(lambda item: item.features))
trainingLabelsAndPredictions = trainingSet.map(lambda item: item.label).zip(predictions)
eva.calculateErrorRate("\nClassification model Training set", trainingLabelsAndPredictions)
predictions = decisionTreeModel.predict(testSet.map(lambda item: item.features))
testLabelsAndPredictions = testSet.map(lambda item: item.label).zip(predictions)
eva.calculateErrorRate("\nClassification model Test set", testLabelsAndPredictions)
return decisionTreeModel
def classify(sc, sample):
def ff(x):
newsample = []
nl = ["rainy","sad","lack"]
ml = ["cloudy","soso","enough"]
pl = ["sunny","happy","most"]
for i in x:
if i in nl:
newsample.append(0)
elif i in ml:
newsample.append(1)
elif i in pl:
newsample.append(2)
return newsample
f = lambda x:1 if x=="yes" else 0
traindata = sc.parallelize(sample).map(lambda x:(ff(x[0]),f(x[1])))
traindata = traindata.map(lambda x:LabeledPoint(x[1],x[0]))
testdata = traindata.first()
print testdata
######
# print "logistic"
# lrModel = LogisticRegressionWithSGD.train(traindata, 10)
# prediction = lrModel.predict(testdata.features)
# print prediction
#####
# print "svm"
# svmModel = SVMWithSGD.train(traindata, 10)
# prediction = svmModel.predict(testdata.features)
# print prediction
#
#
# ####
# print "naive bayes"
# nbModel = NaiveBayes.train(traindata)
# prediction = nbModel.predict(testdata.features)
# print prediction
#
#
# ####
print "decesion tree"
detreeModel = DecisionTree.trainClassifier(traindata, 2, {})
prediction = detreeModel.predict(testdata.features)
print prediction
def main(input_file):
sc = pyspark.SparkContext(appName="DecisionTree")
data = MLUtils.loadLabeledPoints(sc, input_file)
trainingData, testData = data.randomSplit([0.70, 0.3])
# Cache in memory for faster training
trainingData.cache()
model = DecisionTree.trainClassifier(trainingData, numClasses=4, impurity='gini',
categoricalFeaturesInfo={}, maxDepth=16, maxBins=10)
predictions = model.predict(testData.map(lambda x: x.features))
labelsAndPredictions = testData.map(lambda lp: lp.label).zip(predictions)
testErr = labelsAndPredictions.filter(lambda (v, p): v != p).count() / float(testData.count())
# print tree_model.toDebugString()
print ""
print ""
print "Test Erros: {}".format(round(testErr,4))
def trainModel(self, vectSpace, path):
try:
if self.type == 'NaiveBayes':
model = NaiveBayes.train(vectSpace)
elif self.type == 'DecisionTree':
model = DecisionTree.trainClassifier(vectSpace, numClasses = len(self.category), categoricalFeaturesInfo={}, impurity='gini', maxDepth=5, maxBins=5)
if not os.path.exists(path):
os.makedirs(path)
else:
shutil.rmtree(path)
os.makedirs(path)
model.save(self.sc, path)
except:
print "Unexpected error:", sys.exc_info()[0]
raise
return model
def process(sc, dtClusterNum, dtMaxDepth, dtMaxBins, eigenVecFile, markedClusterFile):
filteredEigenVec = sc.textFile(eigenVecFile).map(lambda item: removeVirtualPart(item)).collect()
clusterIDs = sc.textFile(markedClusterFile).map(lambda item: extractClusterID(item)).collect()
clusterIdEigenVecMapRDD = sc.parallelize(clusterIDs).zip(sc.parallelize(filteredEigenVec))
labeledClusterIdEigenVecMapRdd = clusterIdEigenVecMapRDD.map(lambda item: LabeledPoint(item[0], item[1]))
trainingSet, testSet = labeledClusterIdEigenVecMapRdd.randomSplit([0.7, 0.3])
decisionTreeModel = DecisionTree.trainClassifier(trainingSet, numClasses = dtClusterNum,
categoricalFeaturesInfo={},impurity='entropy',maxDepth=dtMaxDepth, maxBins=dtMaxBins)
predictions = decisionTreeModel.predict(trainingSet.map(lambda item: item.features))
trainingLabelsAndPredictions = trainingSet.map(lambda item: item.label).zip(predictions)
eva.calculateErrorRate("\nCluster model Training set", trainingLabelsAndPredictions)
predictions = decisionTreeModel.predict(testSet.map(lambda item: item.features))
testLabelsAndPredictions = testSet.map(lambda item: item.label).zip(predictions)
eva.calculateErrorRate("\nCluster model Test set", testLabelsAndPredictions)
return decisionTreeModel
def create_model(name, training):
if name == 'logistic':
print_box()
print "Logistic Regression Model"
print_box()
model = LogisticRegressionWithLBFGS.train(training)
elif name == 'tree':
print_box()
print "Decision Tree Model"
print_box()
model = DecisionTree.trainClassifier(training, numClasses=2, categoricalFeaturesInfo={},
impurity='gini', maxDepth=5, maxBins=32)
elif name == 'rf':
print_box()
print "Random Forest Model"
print_box()
model = RandomForest.trainClassifier(training, numClasses=2, categoricalFeaturesInfo={},
numTrees=15, featureSubsetStrategy="auto", impurity='gini', maxDepth=5, maxBins=50)
return model
def trainOptimalModel(trainingData, testData):
print "\nTraining optimal Decision Tree model started!"
Utils.logTime()
impurityVals = ['gini', 'entropy']
maxDepthVals = [3,4,5,6,7]
maxBinsVals = [8,16,32]
optimalModel = None
optimalMaxDepth = None
optimalImpurity = None
optimalBinsVal = None
minError = None
try:
for curImpurity in impurityVals:
for curMaxDepth in maxDepthVals:
for curMaxBins in maxBinsVals:
model = DecisionTree.trainClassifier(trainingData,
numClasses=2,
categoricalFeaturesInfo={},
impurity=curImpurity,
maxDepth=curMaxDepth,
maxBins=curMaxBins)
testErr, PR, ROC = Evaluation.evaluate(model, testData)
if testErr < minError or not minError:
minError = testErr
optimalImpurity = curImpurity
optimalMaxDepth = curMaxDepth
optimalBinsVal = curMaxBins
optimalModel = model
except:
msg = "\nException during model training with below parameters:"
msg += "\timpurity: " + str(curImpurity)
msg += "\tmaxDepth: " + str(curMaxDepth)
msg += "\tmaxBins: " + str(curMaxBins)
Utils.logMessage(msg)
logMessage(optimalModel, optimalMaxDepth, optimalImpurity, optimalBinsVal, minError)
return optimalModel
def test_regression(self):
from pyspark.mllib.regression import LinearRegressionWithSGD, LassoWithSGD, \
RidgeRegressionWithSGD
from pyspark.mllib.tree import DecisionTree
data = [
LabeledPoint(-1.0, self.scipy_matrix(2, {1: -1.0})),
LabeledPoint(1.0, self.scipy_matrix(2, {1: 1.0})),
LabeledPoint(-1.0, self.scipy_matrix(2, {1: -2.0})),
LabeledPoint(1.0, self.scipy_matrix(2, {1: 2.0}))
]
rdd = self.sc.parallelize(data)
features = [p.features for p in data]
lr_model = LinearRegressionWithSGD.train(rdd)
self.assertTrue(lr_model.predict(features[0]) <= 0)
self.assertTrue(lr_model.predict(features[1]) > 0)
self.assertTrue(lr_model.predict(features[2]) <= 0)
self.assertTrue(lr_model.predict(features[3]) > 0)
lasso_model = LassoWithSGD.train(rdd)
self.assertTrue(lasso_model.predict(features[0]) <= 0)
self.assertTrue(lasso_model.predict(features[1]) > 0)
self.assertTrue(lasso_model.predict(features[2]) <= 0)
self.assertTrue(lasso_model.predict(features[3]) > 0)
rr_model = RidgeRegressionWithSGD.train(rdd)
self.assertTrue(rr_model.predict(features[0]) <= 0)
self.assertTrue(rr_model.predict(features[1]) > 0)
self.assertTrue(rr_model.predict(features[2]) <= 0)
self.assertTrue(rr_model.predict(features[3]) > 0)
categoricalFeaturesInfo = {0: 2} # feature 0 has 2 categories
dt_model = DecisionTree.trainRegressor(rdd, categoricalFeaturesInfo=categoricalFeaturesInfo)
self.assertTrue(dt_model.predict(features[0]) <= 0)
self.assertTrue(dt_model.predict(features[1]) > 0)
self.assertTrue(dt_model.predict(features[2]) <= 0)
self.assertTrue(dt_model.predict(features[3]) > 0)
def test_classification(self):
from pyspark.mllib.classification import LogisticRegressionWithSGD, SVMWithSGD, NaiveBayes
from pyspark.mllib.tree import DecisionTree
data = [
LabeledPoint(0.0, self.scipy_matrix(2, {0: 1.0})),
LabeledPoint(1.0, self.scipy_matrix(2, {1: 1.0})),
LabeledPoint(0.0, self.scipy_matrix(2, {0: 2.0})),
LabeledPoint(1.0, self.scipy_matrix(2, {1: 2.0}))
]
rdd = self.sc.parallelize(data)
features = [p.features for p in data]
lr_model = LogisticRegressionWithSGD.train(rdd)
self.assertTrue(lr_model.predict(features[0]) <= 0)
self.assertTrue(lr_model.predict(features[1]) > 0)
self.assertTrue(lr_model.predict(features[2]) <= 0)
self.assertTrue(lr_model.predict(features[3]) > 0)
svm_model = SVMWithSGD.train(rdd)
self.assertTrue(svm_model.predict(features[0]) <= 0)
self.assertTrue(svm_model.predict(features[1]) > 0)
self.assertTrue(svm_model.predict(features[2]) <= 0)
self.assertTrue(svm_model.predict(features[3]) > 0)
nb_model = NaiveBayes.train(rdd)
self.assertTrue(nb_model.predict(features[0]) <= 0)
self.assertTrue(nb_model.predict(features[1]) > 0)
self.assertTrue(nb_model.predict(features[2]) <= 0)
self.assertTrue(nb_model.predict(features[3]) > 0)
categoricalFeaturesInfo = {0: 3} # feature 0 has 3 categories
dt_model = DecisionTree.trainClassifier(rdd, numClasses=2,
categoricalFeaturesInfo=categoricalFeaturesInfo)
self.assertTrue(dt_model.predict(features[0]) <= 0)
self.assertTrue(dt_model.predict(features[1]) > 0)
self.assertTrue(dt_model.predict(features[2]) <= 0)
self.assertTrue(dt_model.predict(features[3]) > 0)
sc = SparkContext()
result = {1.0: 'yes', 0.0: 'no'}
# 机器学习实战第三章中的鱼类归属数据源
data = [
LabeledPoint(1, [1, 1]),
LabeledPoint(1, [1, 1]),
LabeledPoint(0, [1, 0]),
LabeledPoint(0, [0, 1]),
LabeledPoint(0, [0, 1])
]
rdd = sc.parallelize(data)
print '------------------------------------'
print type(rdd), dir(rdd)
print rdd.collect()
print '------------------------------------'
model = DecisionTree.trainClassifier(rdd, 3, {})
# print(model)
print '********************************************************'
print(model.toDebugString())
print "test [1,0]: %s" % (result[model.predict(array([1, 0]))])
print "test [1,1]: %s" % (result[model.predict(array([1, 1]))])
print "test [0,0]: %s" % (result[model.predict(array([0, 0]))])
print '********************************************************'
sc.stop()
conf = SparkConf().setAppName(appName).setMaster("local[2]") #at least 2
sc = SparkContext(conf=conf)
ssc = StreamingContext(sc, 1)
# separate the classification label and the actual data
def parsePoint(line):
values = [float(x) for x in line.split(',')]
return LabeledPoint(values[0], values[1:])
# training the model
data = sc.textFile(learning_data_file)
parsedData = data.map(parsePoint)
model = (DecisionTree.trainClassifier(parsedData,
numClasses=2,
categoricalFeaturesInfo={2:9},
impurity='gini',
maxDepth=30))
"""
model = (RandomForest.trainClassifier(parsedData,
numClassesForClassification=2,
numTrees=6,
categoricalFeaturesInfo={2:10},
impurity='gini',
maxDepth=30))
"""
print "====================== model trained ======================"
# streaming and parsing text
lines = ssc.socketTextStream(HOST, QUERY_PORT)
vectors = lines.flatMap(lambda x:x.split(',')).map(lambda l:float(l))
labelsAndPreds = parsedData.map(lambda p: (p.label, SVMmodel.predict(p.features)))
trainErr = labelsAndPreds.filter(lambda (v, p): v != p).count() / float(parsedData.count())
print("Training Error = " + str(trainErr)) ## 0.555395278766
############################ Decision TREE ##############################
from pyspark.mllib.regression import LabeledPoint
from pyspark.mllib.tree import DecisionTree
from pyspark.mllib.util import MLUtils
def parsePoint(line):
values = [float(x) for x in line.split(',')]
return LabeledPoint(values[-1], values[0:9])
data = sc.textFile("/Users/mac/Desktop/USF/MSAnalytics/Spring1/ML2/ML Project/plays.csv")
header = data.first()
data = data.filter(lambda x: x != header)
parsedData = data.map(parsePoint)
model = DecisionTree.trainClassifier(parsedData, numClasses=2, categoricalFeaturesInfo={},
impurity='gini', maxDepth=30, maxBins=100)
# Evaluate model on training instances and compute training error
predictions = model.predict(parsedData.map(lambda x: x.features))
labelsAndPredictions = parsedData.map(lambda lp: lp.label).zip(predictions)
trainErr = labelsAndPredictions.filter(lambda (v, p): v != p).count() / float(parsedData.count()) #0.09
print('Training Error = ' + str(trainErr))
print('Learned classification tree model:')
print(model)
row = []
while column_number < 200:
if array[m + column_number] == 1:
row.append(x[column_number])
index += 1
column_number += 1
return LabeledPoint(train_labels_array[j], row)
trainingData = train_data.map(f)
test = test_data.map(g)
# Train model using DECISION TREE
model = DecisionTree.trainClassifier(trainingData,
numClasses=12613,
categoricalFeaturesInfo={},
impurity='gini',
maxDepth=2,
maxBins=32)
predictions = model.predict(test.map(lambda x: x.features))
labelsAndPredictions = test.map(lambda lp: lp.label).zip(predictions)
# Obtain the accuracy
test_accuracy = labelsAndPredictions.filter(
lambda lp: lp[0] == lp[1]).count() / float(test.count())
accuracies.append(test_accuracy)
m += 200
# LAST individual
individual = individual4
z = 0
# Split each line into a list based on the comma delimiters
csvData = rawData.map(lambda x: x.split(","))
# Convert these lists to LabeledPoints
trainingData = csvData.map(createLabeledPoints)
# Create a test candidate, with 10 years of experience, currently employed,
# 3 previous employers, a BS degree, but from a non-top-tier school where
# he or she did not do an internship. You could of course load up a whole
# huge RDD of test candidates from disk, too.
testCandidates = [ array([10, 1, 3, 1, 0, 0])]
testData = sc.parallelize(testCandidates)
# Train our DecisionTree classifier using our data set
model = DecisionTree.trainClassifier(trainingData, numClasses=2,
categoricalFeaturesInfo={1:2, 3:4, 4:2, 5:2},
impurity='gini', maxDepth=5, maxBins=32)
# Now get predictions for our unknown candidates. (Note, you could separate
# the source data into a training set and a test set while tuning
# parameters and measure accuracy as you go!)
predictions = model.predict(testData)
print ('Hire prediction:')
results = predictions.collect()
for result in results:
print result
# We can also print out the decision tree itself:
print('Learned classification tree model:')
print(model.toDebugString())
def test_all(self, measure_columns=None, dimension_columns=None):
measures = measure_columns
if measure_columns is None:
measures = self._measure_columns
dimension = dimension_columns[0]
all_dimensions = self._dimension_columns
all_measures = self._measure_columns
cat_feature_info = []
columns_without_dimension = list(x for x in all_dimensions
if x != dimension)
mapping_dict = {}
masterMappingDict = {}
decision_tree_result = DecisionTreeResult()
for column in all_dimensions:
mapping_dict[column] = dict(
enumerate(
self._data_frame.select(column).distinct().rdd.map(
lambda x: str(x[0])).collect()))
# for c in mapping_dict:
# name = c
# reverseMap = {v: k for k, v in mapping_dict[c].iteritems()}
# udf = UserDefinedFunction(lambda x: reverseMap[x], StringType())
# self._data_frame = self._data_frame.select(*[udf(column).alias(name) if column == name else column for column in self._data_frame.columns])
# converting spark dataframe to pandas for transformation and then back to spark dataframe
pandasDataFrame = self._data_frame.toPandas()
for key in mapping_dict:
pandasDataFrame[key] = pandasDataFrame[key].apply(
lambda x: 'None' if x == None else x)
reverseMap = {v: k for k, v in mapping_dict[key].items()}
pandasDataFrame[key] = pandasDataFrame[key].apply(
lambda x: reverseMap[x])
# sqlCtx = SQLContext(self._spark)
self._data_frame = self._spark.createDataFrame(pandasDataFrame)
self._mapping_dict = mapping_dict
for c in columns_without_dimension:
cat_feature_info.append(
self._data_frame.select(c).distinct().count())
if len(cat_feature_info) > 0:
max_length = max(cat_feature_info)
else:
max_length = 32
cat_feature_info = dict(enumerate(cat_feature_info))
dimension_classes = self._data_frame.select(
dimension).distinct().count()
self._data_frame = self._data_frame[[dimension] +
columns_without_dimension +
all_measures]
data = self._data_frame.rdd.map(lambda x: LabeledPoint(x[0], x[1:]))
(trainingData, testData) = data.randomSplit([1.0, 0.0])
# TO DO : set maxBins at least equal to the max level of categories in dimension column
model = DecisionTree.trainClassifier(
trainingData,
numClasses=dimension_classes,
categoricalFeaturesInfo=cat_feature_info,
impurity='gini',
maxDepth=3,
maxBins=max_length)
output_result = model.toDebugString()
decision_tree = self.tree_json(output_result, self._data_frame)
self.generate_probabilities(decision_tree, dimension)
# self._new_tree = utils.recursiveRemoveNullNodes(self._new_tree)
# decision_tree_result.set_params(self._new_tree, self._new_rules, self._total, self._success, self._probability)
decision_tree_result.set_params(decision_tree, self._new_rules,
self._total, self._success,
self._probability)
return decision_tree_result
print "Decision Tree feature vector length: " + str(
len(first_point_tree.features))
# In[167]:
from pyspark.mllib.tree import DecisionTree
#from the RDD sample 20% for training and rest for test
records_tree_with_idx = data_tree.zipWithIndex().map(lambda (k, v): (v, k))
test_tree_idx = records_tree_with_idx.sample(False, 0.2, 42)
training_tree_idx = records_tree_with_idx.subtractByKey(test_tree_idx)
test_tree = test_tree_idx.map(lambda (idx, p): p)
training_tree = training_tree_idx.map(lambda (idx, p): p)
model_tree = DecisionTree.trainRegressor(training_tree, {})
preds_tree = model_tree.predict(test_tree.map(lambda p: p.features))
actual_tree = test_tree.map(lambda p: p.label)
true_vs_predicted_tree = actual_tree.zip(preds_tree)
print "Decision Tree predictions: " + str(true_vs_predicted_tree.take(5))
print "Decision Tree depth: " + str(model_tree.depth())
print "Decision Tree number of nodes: " + str(model_tree.numNodes())
# In[177]:
mse_tree = true_vs_predicted_tree.map(lambda
(t, p): squared_error(t, p)).mean()
mae_tree = true_vs_predicted_tree.map(lambda (t, p): abs_error(t, p)).mean()
sc = SparkContext(appName="PythonDecisionTreeClassificationExample")
# $example on$
# Load and parse the data file into an RDD of LabeledPoint.
data = MLUtils.loadLibSVMFile(sc, 'carbon2.txt')
# Split the data into training and test sets (30% held out for testing)
(trainingData, testData) = data.randomSplit([0.7, 0.3])
# Train a DecisionTree model.
# Empty categoricalFeaturesInfo indicates all features are continuous.
model = DecisionTree.trainClassifier(trainingData,
numClasses=5,
categoricalFeaturesInfo={
0: 5,
1: 5
},
impurity='entropy',
maxDepth=5,
maxBins=32)
# Evaluate model on test instances and compute test error
predictions = model.predict(testData.map(lambda x: x.features))
labelsAndPredictions = testData.map(lambda lp: lp.label).zip(predictions)
testErr = labelsAndPredictions.filter(
lambda (v, p): v != p).count() / float(testData.count())
print('Test Error = ' + str(testErr))
print('Learned classification tree model:')
print(model.toDebugString())
# Save and load model
def test_all(self, measure_columns=None, dimension_columns=None):
measures = measure_columns
if measure_columns is None:
measures = self._measure_columns
self._target_dimension = dimension_columns[0]
dimension = self._target_dimension
#####Look into it for Issue 947#################
max_num_levels = GLOBALSETTINGS.DTREE_OTHER_DIMENSION_MAX_LEVEL
# max_num_levels = min(max_num_levels, round(self._dataframe_helper.get_num_rows()**0.5))
# all_dimensions = [dim for dim in self._dimension_columns if self._dataframe_helper.get_num_unique_values(dim) <= max_num_levels]
all_dimensions = [
dim for dim in self._dimension_columns
if self._metaParser.get_num_unique_values(dim) <= max_num_levels
]
all_measures = self._measure_columns
if self._pandas_flag:
self._data_frame = self._data_frame[all_dimensions + all_measures]
cat_feature_info = []
columns_without_dimension = [
x for x in all_dimensions if x != dimension
]
mapping_dict = {}
masterMappingDict = {}
decision_tree_result = DecisionTreeResult()
decision_tree_result.set_freq_distribution(
self._metaParser.get_unique_level_dict(self._target_dimension),
self._important_vars)
if self._pandas_flag:
try:
all_dimensions.remove(dimension)
except:
pass
actual_cols = list(self._data_frame.columns)
print(actual_cols)
self._data_frame = pd.get_dummies(self._data_frame,
columns=all_dimensions)
after_dummy_cols = list(self._data_frame.columns)
def Diff(li1, li2):
return (list(
list(set(li1) - set(li2)) + list(set(li2) - set(li1))))
decision_tree_result.dummy_cols = [
Diff(after_dummy_cols, Diff(actual_cols, all_dimensions)),
all_dimensions
]
all_dimensions.append(dimension) #this has been done for scoring error
if self._pandas_flag:
self._data_frame, mapping_dict = MLUtils.add_string_index(
self._data_frame, [dimension], self._pandas_flag)
else:
self._data_frame, mapping_dict = MLUtils.add_string_index(
self._data_frame, all_dimensions, self._pandas_flag)
if self._pandas_flag:
print(self._data_frame.head(1))
else:
print(self._data_frame.show(1))
# standard_measure_index = {0.0:'Low',1.0:'Medium',2.0:'High'}
standard_measure_index = {
0.0: 'Low',
1.0: 'Below Average',
2.0: 'Average',
3.0: 'Above Average',
4.0: 'High'
}
for measure in all_measures:
mapping_dict[measure] = standard_measure_index
for k, v in list(mapping_dict.items()):
temp = {}
for k1, v1 in list(v.items()):
self._alias_dict[v1.replace(",", "")] = v1
temp[k1] = v1.replace(",", "")
mapping_dict[k] = temp
self._mapping_dict = mapping_dict
if not self._pandas_flag:
for c in columns_without_dimension:
if self._pandas_flag:
cat_feature_info.append(len(self._data_frame[c].unique()))
else:
cat_feature_info.append(
self._data_frame.select(c).distinct().count())
for c in all_measures:
cat_feature_info.append(5)
columns_without_dimension = columns_without_dimension + all_measures
all_measures = []
if len(cat_feature_info) > 0:
max_length = max(cat_feature_info)
else:
max_length = 32
else:
decision_tree_result.mappingdict = mapping_dict[dimension]
max_length = 32
cat_feature_info = dict(enumerate(cat_feature_info))
if self._pandas_flag:
dimension_classes = len(self._data_frame[dimension].unique())
else:
dimension_classes = self._data_frame.select(
dimension).distinct().count()
if not self._pandas_flag:
self._data_frame = self._data_frame[[dimension] +
columns_without_dimension +
all_measures]
print("=" * 200)
# print self._data_frame.rdd.first()
print("numClasses", dimension_classes)
print("maxDepth", self._maxDepth)
decision_tree_result._maxDepth = self._maxDepth
print("maxBins", max_length)
print("=" * 200)
if self._pandas_flag:
self._data_frame.columns = [
re.sub('\W+', '_', col.strip())
for col in self._data_frame.columns
]
x = self._data_frame.drop(dimension, axis=1)
y = self._data_frame[dimension]
#tle = LabelEncoder()
#y = tle.fit_transform(y)
for i in x.columns:
x[i] = x[i].fillna(x[i].mode()[0])
model = DecisionTreeClassifier(criterion='gini',
max_depth=self._maxDepth,
random_state=42)
model = model.fit(x, y)
output_result = self.tree_to_code(model, list(x.columns))
output_result = list(map(lambda x: x.strip(), output_result))
else:
data = self._data_frame.rdd.map(
lambda x: LabeledPoint(x[0], x[1:]))
(trainingData, testData) = data.randomSplit([1.0, 0.0])
# TO DO : set maxBins at least equal to the max level of categories in dimension column
# model = DecisionTree.trainClassifier(trainingData, numClasses=dimension_classes, categoricalFeaturesInfo=cat_feature_info, impurity='gini', maxDepth=self._maxDepth, maxBins=max_length)
# Removed categoricalFeaturesInfo to be passed to DecisionTree to get all levels and consider all feature as continuous variables
#But that results in wrong result in Prediction Rule eg: columns containing "yes" or "no" as its value is considered as float value(0.5) so removing categoricalFeaturesInfo={} with categoricalFeaturesInfo=cat_feature_info
model = DecisionTree.trainClassifier(
trainingData,
numClasses=dimension_classes,
categoricalFeaturesInfo=cat_feature_info,
impurity='gini',
maxDepth=self._maxDepth,
maxBins=max_length)
output_result = model.toDebugString()
decision_tree = self.tree_json(output_result, self._data_frame,
self._pandas_flag)
self._new_tree = self.generate_new_tree(decision_tree)
node_list = self.node_name_extractor(self._new_tree)
node_list = list(self.flatten(node_list))
correct_count_list = [i[0] for i in self._count_list]
tree_dict = dict(list(zip(node_list, correct_count_list)))
self._new_tree = self.wrap_tree(self._new_tree, tree_dict)
self._path_dict = self.path_dict_creator(node_list, self._new_tree)
print("===" * 40)
decision_tree_result.set_params(self._new_tree, self._new_rules,
self._total, self._success,
self._probability, self._path_dict)
self._completionStatus += old_div(
self._scriptWeightDict[self._analysisName]["script"] *
self._scriptStages["treegeneration"]["weight"], 10)
progressMessage = CommonUtils.create_progress_message_object(self._analysisName,\
"treegeneration",\
"info",\
self._scriptStages["treegeneration"]["summary"],\
self._completionStatus,\
self._completionStatus)
CommonUtils.save_progress_message(self._messageURL,
progressMessage,
ignore=self._ignoreMsg)
self._dataframe_context.update_completion_status(
self._completionStatus)
return decision_tree_result
# Append Labels
appendColumn(ensemble_test, rf_test_predict_label)
appendColumn(ensemble_train, rf_train_predict_label)
# Decision Trees
# C13 - C21
# Build the Model
max_depth = [5, 10, 15, 20]
for i in range(0, len(max_depth), 1):
m_depth = max_depth[i]
# Build the Model
model = DecisionTree.trainClassifier(train_data,
10, {},
impurity='gini',
maxDepth=m_depth)
rf_train_predict_label = []
rf_test_predict_label = []
# Predict Labels
for j in range(0, len(test_features), 1):
p_l = model.predict(test_features[j])
rf_test_predict_label.extend([p_l])
for j in range(0, len(train_features), 1):
p_l = model.predict(train_features[j])
rf_train_predict_label.extend([p_l])
# Append Labels
#exec(open("./doweathclass_dectree.py").read())
# ---------------- now try decision tree ------------
from pyspark.mllib.tree import DecisionTree
dt_model = DecisionTree.trainClassifier(datax_rdd,
2, {},
impurity='entropy',
maxDepth=3,
maxBins=32,
minInstancesPerNode=2)
#maxDepth and maxBins
#{} could be categorical feature list,
# To do regression, have no numclasses,and use trainRegression function
print(dt_model.toDebugString())
#results in this:
#DecisionTreeModel classifier of depth 3 with 9 nodes
# If (feature 1 <= 0.0)
# If (feature 4 <= 80.0)
# If (feature 3 <= 68.0)
# Predict: 0.0
# Else (feature 3 > 68.0)
# Predict: 1.0
# Else (feature 4 > 80.0)
# If (feature 0 <= 0.0)
# Predict: 0.0
# Else (feature 0 > 0.0)
# Predict: 0.0
# Else (feature 1 > 0.0)
# Predict: 1.0
# In[ ]:
# In[53]:
(trainingData, testData) = fdata.randomSplit([0.8, 0.2])
# Use the decision tree classifier to train the model
# In[54]:
from pyspark.mllib.tree import DecisionTree
# In[55]:
model = DecisionTree.trainClassifier(trainingData,
numClasses=3,
categoricalFeaturesInfo={})
# In[56]:
predictions = model.predict(testData.map(lambda row: row.features))
# Create Confusion Matrix to evaluate the accuracy of the model
# We create a matrix containing the test labels as a first column (real values) and predicted values as second column
# In[57]:
predictionsAndLabels = testData.map(
lambda labeledpoint: labeledpoint.label).zip(predictions)
# Load data.
dataPath = 'train_svm'# 'data/mllib/sample_libsvm_data.txt'
if len(sys.argv) == 2:
dataPath = sys.argv[1]
if not os.path.isfile(dataPath):
sc.stop()
usage()
points = MLUtils.loadLibSVMFile(sc, dataPath)
# Re-index class labels if needed.
(reindexedData, origToNewLabels) = reindexClassLabels(points)
numClasses = len(origToNewLabels)
# Train a classifier.
categoricalFeaturesInfo = {} # no categorical features
model = DecisionTree.trainClassifier(reindexedData, numClasses=numClasses,
categoricalFeaturesInfo=categoricalFeaturesInfo)
# Print learned tree and stats.
print origToNewLabels
print "Trained DecisionTree for classification:"
print " Model numNodes: %d" % model.numNodes()
print " Model depth: %d" % model.depth()
print " Training accuracy: %g" % getAccuracy(model, reindexedData)
if model.numNodes() < 20:
print model.toDebugString()
else:
print model
# testdata = MLUtils.loadLibSVMFile(sc, 'test_svm2')
data = numpy.genfromtext('test_svm2', delimiter=',')
#reuben
rdd = sc.parallelize(data)
model.predict(rdd).collect()
def train_validate_test_rpart():
try:
plaintext_rdd = sc.textFile("file:///Users/blahiri/healthcare/data/cloudera_challenge/pat_proc_larger.csv") #69.2 MB
pat_proc = pycsv.csvToDataFrame(sqlContext, plaintext_rdd, sep = ",")
anom = pat_proc.filter(pat_proc.is_anomalous == 1)
benign = pat_proc.filter(pat_proc.is_anomalous == 0)
n_benign = benign.count()
print("anom.count() = " + str(anom.count()) + ", benign.count() = " + str(benign.count())) #anom.count() = 49542, benign.count() = 197406
sample_from_benign = benign.sample(False, 50000/n_benign)
pat_proc = anom.unionAll(sample_from_benign)
print("pat_proc.count() = " + str(pat_proc.count())) #99,227
all_columns = pat_proc.columns
features = [x for x in all_columns if (x not in ["patient_id", "is_anomalous"])]
categorical_features = ["age_group", "gender", "income_range"] #We are listing these 3 as categorical features only as the procedure features have 0-1 values anyway
procedure_features = [x for x in features if (x not in categorical_features)]
#Construct the map categoricalFeaturesInfo, which specifies which features are categorical and how many categorical values each of those features can take.
#Create a dictionary where the key-value pairs are as follows: key is the name of the categorical feature, and value is a list with the following entries:
#1) an id of the feature that is incremented sequentially, 2) no. of distinct values of the feature, 3) a list of the distinct values of the feature.
cat_feature_number = 0
dict_cat_features = {}
for feature in categorical_features:
agvalues = pat_proc.select(pat_proc[feature].cast("string").alias("feature")).distinct().collect() #collect() is an action that returns all the elements of the dataset as an array at the driver program.
#Calls to collect() imply there would be communication between the executors and the driver, so use it with discretion.
distinct_values = map(lambda row: row.asDict().values()[0], agvalues)
distinct_values = sorted(map(lambda unicode_val: unicode_val.encode('ascii','ignore'), distinct_values))
dict_cat_features[feature] = [cat_feature_number, len(distinct_values), distinct_values]
cat_feature_number += 1
pat_proc = pat_proc.rdd
print("pat_proc.getNumPartitions() = " + str(pat_proc.getNumPartitions())) #4 partitions: the default should be the number of logical cores, which is 8
(train, test) = pat_proc.randomSplit([0.5, 0.5])
test_data_size = test.count()
print("train.count() = " + str(train.count()) + ", test.count() = " + str(test_data_size))
training_data = train.map(lambda x: create_labeled_point(x, features, categorical_features, dict_cat_features, procedure_features))
print("training_data.count() = " + str(training_data.count()))
#Populate the actual categoricalFeaturesInfo dictionary
cat_features_info = dict([(value[0], value[1]) for (key, value) in dict_cat_features.iteritems()])
procedure_features_info = dict([(feature_id, 2) for feature_id in range(3, 2 + len(procedure_features))])
cat_features_info = dict(cat_features_info.items() + procedure_features_info.items())
t0 = time()
model = DecisionTree.trainClassifier(training_data, numClasses = 2, categoricalFeaturesInfo = cat_features_info, impurity = 'gini', maxDepth = 2, maxBins = 32)
#Under the hood in DecisionTree.scala, RandomForest is called with numTrees = 1 and featureSubsetStrategy = "all".
tt = time() - t0
print "Classifier trained in {} seconds".format(round(tt,3)) #63.355 seconds (5.5 times compared to standalone R). Even when maxDepth was reduced from 5 to 2, time to train was 61.942 seconds.
print(model)
test_data = test.map(lambda x: create_labeled_point(x, features, categorical_features, dict_cat_features, procedure_features))
t0 = time()
predictions = model.predict(test_data.map(lambda p: p.features))
tt = time() - t0
print "Prediction made in {} seconds".format(round(tt,3)) #0.014 seconds
labels_and_preds = test_data.map(lambda p: p.label).zip(predictions) #Create a list of tuples with each tuple having the actual and the predicted label
test_accuracy = labels_and_preds.filter(lambda (v, p): v == p).count() / float(test_data_size)
fpr = labels_and_preds.filter(lambda (v, p): (v == 0 and p == 1)).count()/labels_and_preds.filter(lambda (v, p): v == 0).count()
fnr = labels_and_preds.filter(lambda (v, p): (v == 1 and p == 0)).count()/labels_and_preds.filter(lambda (v, p): v == 1).count()
print "Test accuracy is {}, fpr is {}, fnr is {}".format(round(test_accuracy, 4), round(fpr, 4), round(fnr, 4)) #With maxDepth = 5, test accuracy is 0.9084, fpr is 0.1555, fnr is 0.0272.
#With maxDepth = 2, test accuracy is 0.861, fpr is 0.2591, fnr is 0.018
print model.toDebugString()
except Exception:
print("Exception in user code:")
traceback.print_exc(file = sys.stdout)
return model
# print('\n== ACCURACY BAYES : ', accuracy_bayes , '==')
#
# file.write("\n" + "== Results on labeled data (Brexit) ==" + "\n")
# file.write('\n-> ACCURACY BAYES : ' + str(accuracy_bayes) + '\n')
#
print("\n===================================================== ")
print("=================== DECISION TREE =================== ")
print("===================== (Entropy) ===================== ")
print("=====================================================\n")
print("\n=================== Training ================== \n")
model_decision_tree_entropy = DecisionTree.trainClassifier(
training,
categoricalFeaturesInfo={},
impurity="entropy",
maxDepth=5,
numClasses=2)
print("Done : DT entropy training")
print("\n========= Test on Brexit labeled data ========= ")
#decision tree entropy
labeled_prediction_entropy = test_tlabels_brexit.zip(
model_decision_tree_entropy.predict(tfidf_test_brexit)).map(
lambda x: {
"actual": x[0],
"predicted": x[1]
})
accuracy_entropy = 1.0 * labeled_prediction_entropy.filter(
lambda doc: doc["actual"] == doc['predicted']).count(
attack = 0.0
if len(line_split) >= 9 and line_split[9] == 'title':
attack = 1.0
return LabeledPoint(attack, array([float(x) for x in clean_line_split]))
training_data = csv_data.map(create_labeled_point)
test_data = test_csv_data.map(create_labeled_point)
# Build the model
t0 = time()
tree_model = DecisionTree.trainClassifier(
training_data,
numClasses=2,
categoricalFeaturesInfo={0: len(protocols)},
impurity='gini',
maxDepth=4,
maxBins=100)
tt = time() - t0
print "Classifier trained in {} seconds".format(round(tt, 3))
predictions = tree_model.predict(test_data.map(lambda p: p.features))
labels_and_preds = test_data.map(lambda p: p.label).zip(predictions)
t0 = time()
test_accuracy = labels_and_preds.filter(lambda (v, p): v == p).count() / float(
test_data.count())
tt = time() - t0
# get 90% train and 10% test data
data_with_idx = data_dt.zipWithIndex().map(lambda (k, v): (v, k))
test = data_with_idx.sample(False, 0.1, 42)
train = data_with_idx.subtractByKey(test)
train_data = train.map(lambda (idx, p): p)
test_data = test.map(lambda (idx, p): p)
train_size = train_data.count()
test_size = test_data.count()
print "Training data size: %d" % train_size
print "Test data size: %d" % test_size
print "Total data size: %d " % num_data
print "Train + Test size : %d" % (train_size + test_size)
# make decision tree model
dt_model = DecisionTree.trainRegressor(train_data, {})
# make predictions and measure error
preds = dt_model.predict(test_data.map(lambda p: p.features))
actual = test_data.map(lambda p: p.label)
true_vs_predicted_dt = actual.zip(preds)
print "Decision Tree predictions: " + str(true_vs_predicted_dt.take(5))
print "Decision Tree depth: " + str(dt_model.depth())
print "Decision Tree number of nodes: " + str(dt_model.numNodes())
def squared_error(actual, pred):
return (pred - actual)**2
def squared_log_error(pred, actual):
help(LinearRegressionWithSGD.train)
help(DecisionTree.trainRegressor)
# ## Train a Regression Model on the Bike Sharing Dataset
linear_model = LinearRegressionWithSGD.train(data,
iterations=10,
step=0.1,
intercept=False)
true_vs_predicted = data.map(lambda p:
(p.label, linear_model.predict(p.features)))
print("Linear Model predictions: " + str(true_vs_predicted.take(5)))
# we pass in an mepty mapping for categorical feature size {}
dt_model = DecisionTree.trainRegressor(data_dt, {}) #여기서 에러 뜨네...
preds = dt_model.predict(data_dt.map(lambda p: p.features))
actual = data.map(lambda p: p.label)
true_vs_predicted_dt = actual.zip(preds)
print("Decision Tree predictions: " + str(true_vs_predicted_dt.take(5)))
print("Decision Tree depth: " + str(dt_model.depth()))
print("Decision Tree number of nodes: " + str(dt_model.numNodes()))
# 자 이제, linear regression/decisiontree 의 잔차 제곱을 통해 성능을 비교해보자.
# ## Perfomance Metrics
# set up performance metrics functions
def squared_error(actual, pred):
if fields[6] == "Y":
hired = 1
else:
hired = 0
return LabeledPoint(hired, [years_of_exp,employed,previousEmployers,education_level,top_tier_school,internship])
path = '/home/sejal/Documents/datascience/dataset/data/emp/candidates_hired_past.csv'
r1 = sc.textFile(path)
r2 = r1.map(lambda entry: entry.split(','))
training_data = r2.map(prepare_data_for_DT)
test_data = [10,1,2,2,1,0]
model = DecisionTree.trainClassifier(training_data, numClasses=2, categoricalFeaturesInfo={1:2, 3:4,4:2,5:2})
predictions = model.predict(test_data)
print("Hire OR No-Hire")
print (predictions)
print (model.toDebugString())
# results = predictions.collect()
# for result in results:
# print result
pd.DataFrame(dfd.take(5), columns=dfd.columns).transpose()
def labelData(data):
return data.map(lambda row: LabeledPoint(row[9], [
row[0], row[1], row[2], row[3], row[4], row[5], row[6], row[7], row[8],
row[10], row[11], row[12], row[13], row[14], row[15]
]))
trainData, testData = labelData(dfd).randomSplit([0.8, 0.2])
model = DecisionTree.trainClassifier(trainData,
numClasses=4,
maxDepth=6,
categoricalFeaturesInfo={},
impurity='gini',
maxBins=50)
print model.toDebugString()
def getPredictionLabels(model, testData):
predictions = model.predict(testData.map(lambda r: r.features))
return predictions.zip(testData.map(lambda r: r.label))
def printMetrics(pred_and_label):
metrics = MulticlassMetrics(pred_and_label)
print 'Preicision of 1', metrics.precision(1)
print 'Preicision of 2', metrics.precision(2)
attack = 1.0
if line_split[41] == 'normal.':
attack = 0.0
return LabeledPoint(attack, array([float(x) for x in clean_line_split]))
training_data = csv_data.map(create_labeled_point)
test_data = test_csv_data.map(create_labeled_point)
t0 = time()
tree_model = DecisionTree.trainClassifier(training_data,
numClasses=2,
categoricalFeaturesInfo={
1: len(protocols),
2: len(services),
3: len(flags)
},
maxDepth=4,
maxBins=100)
tt = time() - t0
print("Classifier trained in {} seconds".format(round(tt, 3)))
t0 = time()
predictions = tree_model.predict(test_data.map(lambda x: x.features))
labels_and_preds = test_data.map(lambda x: x.label).zip(predictions)
test_accuracy = labels_and_preds.filter(
lambda x: x[0] == x[1]).count() / float(test_data.count())
tt = time() - t0
print("Prediction made in {} seconds. Test accuracy is {}".format(
round(tt, 3), round(test_accuracy, 3)))
print '决策树特征向量长度: ' + str(len(first_point_dt.features))
from pyspark.mllib.regression import LinearRegressionWithSGD
from pyspark.mllib.tree import DecisionTree
help(LinearRegressionWithSGD.train)
linear_model = LinearRegressionWithSGD.train(data,
iterations=10,
step=0.1,
intercept=False)
true_vs_predicted = data.map(
lambda point: (point.label, linear_model.predict(point.features)))
print '线性回归模型对前5个样本的预测值: ' + str(true_vs_predicted.take(5))
dt_model = DecisionTree.trainRegressor(data_dt, {})
preds = dt_model.predict(data_dt.map(lambda p: p.features))
actual = data.map(lambda p: p.label)
true_vs_predicted_dt = actual.zip(preds)
print '决策树回归模型对前5个样本的预测值: ' + str(true_vs_predicted_dt.take(5))
print '决策树模型的深度: ' + str(dt_model.depth())
print '决策树模型的叶子节点个数: ' + str(dt_model.numNodes())
def squared_error(actual, pred):
return (pred - actual)**2
def abs_error(actual, pred):
return np.abs(pred - actual)
def main():
appName = "BadOrGood;zl"
conf = (SparkConf()
.setAppName(appName)
.set("spark.executor.memory", "5g")
.set("spark.executor.cores","3")
.set("spark.executor.instance", "3")
)
sc = SparkContext(conf = conf)
hc = HiveContext(sc)
#fetch data
#filepath = '/sshomework_zl/BadOrGood/AllDataRowrdd'
#fetchDataToFile(hc, filepath)
#load data
# AllDataRawrdd = sc.pickleFile(filepath) \
# .map( lambda _: {'label':int(_.status), 'feature':extractFeature(_)} ) \
# .repartition(10)
AllDataRawrdd = sc.pickleFile('/pickleData').repartition(10)
#standardizer for train and test data
model = StandardScaler(True, True) \
.fit( AllDataRawrdd \
.map( lambda _: Vectors.dense(_['feature']) )
)
labels = AllDataRawrdd.map(lambda _: _['label'])
featureTransformed = model.transform( AllDataRawrdd.map(lambda _: _['feature']) )
AllDataRawrdd = labels \
.zip(featureTransformed) \
.map( lambda _: { 'label':_[0], 'feature':_[1] } )
#sampling
trainDataRawrdd, testDataRawrdd = AllDataRawrdd.randomSplit(weights=[0.7, 0.3], seed=100)
trainDatardd = trainDataRawrdd.map( lambda _: LabeledPoint( _['label'], _['feature'] ) ).persist()
testDatardd = testDataRawrdd.map( lambda _: {'label': _['label'], 'feature': list(_['feature']) } ).persist()
#prediction & test
lrmLBFGS = LogisticRegressionWithLBFGS.train(trainDatardd, iterations=3000, regParam=0.01, regType="l1")
resultrdd = test(lrmLBFGS, testDatardd)
lrmLBFGSFone = fone(resultrdd)
lrmLBFGSac = accuracy(resultrdd)
lrmSGD = LogisticRegressionWithSGD.train(trainDatardd, iterations=3000, step=0.1, regParam=0.01, regType="l1")
resultrdd = test(lrmSGD, testDatardd)
lrmSGDFone = fone(resultrdd)
lrmSGDac = accuracy(resultrdd)
dt = DecisionTree.trainClassifier(trainDatardd, 2, {}, maxDepth=10)
resultrdd = test(dt, testDatardd)
dtFone = fone(resultrdd)
dtac = accuracy(resultrdd)
rf = RandomForest.trainClassifier(trainDatardd, 2, {}, 10)
resultrdd = test(rf, testDatardd)
rfFone = fone(resultrdd)
rfac = accuracy(resultrdd)
print "LR_LBFGS f1 is : %f, ac is : %f" % (lrmLBFGSFone, lrmLBFGSac)
print "LR_SGD f1 is : %f, ac is : %f" % (lrmSGDFone, lrmSGDac)
print "Decision Tree f1 is: %f, ac is : %f" % (dtFone, dtac)
print "Random Forest f1 is: %f, ac is : %f" % (rfFone, rfac)
print lrmLBFGS.weights
print lrmSGD.weights
sc.stop()
LR_model = LogisticRegressionWithLBFGS.train(trained_hashed)
LR_prediction_and_labels = check_hashed.map(lambda point: (LR_model.predict(point.features), point.label))
LR_correct = LR_prediction_and_labels.filter(lambda predicted, actual: predicted == actual)
LR_accuracy = LR_correct.count() / float(check_hashed.count())
print ("LR training accuracy:" + str(LR_accuracy * 100) + " %")
LR_output_dir = 'hdfs://master:9000/user/hadoop/LogisticRegression'
shutil.rmtree("hdfs://master:9000/user/hadoop/LogisticRegression/metadata", ignore_errors=True)
LR_model.save(cc, LR_output_dir)
SVM_model = SVMWithSGD.train(trained_hashed, iterations=10)
SVM_prediction_and_labels = check_hashed.map(lambda point: (SVM_model.predict(point.features), point.label))
SVM_model.clearThreshold()
SVM_correct = SVM_prediction_and_labels.filter(lambda predicted, actual: predicted == actual)
SVM_accuracy = SVM_correct.count() / float(check_hashed.count())
print ("SVM training accuracy:" + str(SVM_accuracy * 100) + " %")
SVM_output = 'hdfs://master:9000/user/hadoop/SVM'
shutil.rmtree("hdfs://master:9000/user/hadoop/SVM/metadata", ignore_errors=True)
SVM_model.save(cc, SVM_output)
model = DecisionTree.trainClassifier(trained_hashed, numClasses=2, categoricalFeaturesInfo={},
impurity='gini', maxDepth=5, maxBins=32)
predictions = model.predict(check_hashed.map(lambda x: x.features))
labelsAndPredictions = check_hashed.map(lambda lp: lp.label).zip(predictions)
testErr = labelsAndPredictions.filter(
lambda lp: lp[0] != lp[1]).count() / float(check_hashed.count())
print('Test Error = ' + str(testErr))
print('Learned classification tree model:')
print(model.toDebugString())
model.save(cc, "hdfs:///user/hadoop/DT")
# get 90% train and 10% test data
data_with_idx = data_dt.zipWithIndex().map(lambda (k, v): (v, k))
test = data_with_idx.sample(False, 0.1)
train = data_with_idx.subtractByKey(test)
train_data = train.map(lambda (idx, p): p)
test_data = test.map(lambda (idx, p) : p)
train_size = train_data.count()
test_size = test_data.count()
print "Training data size: %d" % train_size
print "Test data size: %d" % test_size
print "Total data size: %d " % num_data
print "Train + Test size : %d" % (train_size + test_size)
# make decision tree model
dt_model = DecisionTree.trainRegressor(train_data,{})
# make predictions and measure error
preds = dt_model.predict(test_data.map(lambda p: p.features))
actual = test_data.map(lambda p: p.label)
true_vs_predicted_dt = actual.zip(preds)
print "Decision Tree predictions: " + str(true_vs_predicted_dt.take(5))
print "Decision Tree depth: " + str(dt_model.depth())
print "Decision Tree number of nodes: " + str(dt_model.numNodes())
def squared_error(actual, pred):
return (pred - actual)**2
def squared_log_error(pred, actual):
return (np.log(pred + 1) - np.log(actual + 1))**2
def test_classification(self):
from pyspark.mllib.classification import LogisticRegressionWithSGD, SVMWithSGD, NaiveBayes
from pyspark.mllib.tree import DecisionTree, DecisionTreeModel, RandomForest, \
RandomForestModel, GradientBoostedTrees, GradientBoostedTreesModel
data = [
LabeledPoint(0.0, [1, 0, 0]),
LabeledPoint(1.0, [0, 1, 1]),
LabeledPoint(0.0, [2, 0, 0]),
LabeledPoint(1.0, [0, 2, 1])
]
rdd = self.sc.parallelize(data)
features = [p.features.tolist() for p in data]
temp_dir = tempfile.mkdtemp()
lr_model = LogisticRegressionWithSGD.train(rdd, iterations=10)
self.assertTrue(lr_model.predict(features[0]) <= 0)
self.assertTrue(lr_model.predict(features[1]) > 0)
self.assertTrue(lr_model.predict(features[2]) <= 0)
self.assertTrue(lr_model.predict(features[3]) > 0)
svm_model = SVMWithSGD.train(rdd, iterations=10)
self.assertTrue(svm_model.predict(features[0]) <= 0)
self.assertTrue(svm_model.predict(features[1]) > 0)
self.assertTrue(svm_model.predict(features[2]) <= 0)
self.assertTrue(svm_model.predict(features[3]) > 0)
nb_model = NaiveBayes.train(rdd)
self.assertTrue(nb_model.predict(features[0]) <= 0)
self.assertTrue(nb_model.predict(features[1]) > 0)
self.assertTrue(nb_model.predict(features[2]) <= 0)
self.assertTrue(nb_model.predict(features[3]) > 0)
categoricalFeaturesInfo = {0: 3} # feature 0 has 3 categories
dt_model = DecisionTree.trainClassifier(
rdd,
numClasses=2,
categoricalFeaturesInfo=categoricalFeaturesInfo,
maxBins=4)
self.assertTrue(dt_model.predict(features[0]) <= 0)
self.assertTrue(dt_model.predict(features[1]) > 0)
self.assertTrue(dt_model.predict(features[2]) <= 0)
self.assertTrue(dt_model.predict(features[3]) > 0)
dt_model_dir = os.path.join(temp_dir, "dt")
dt_model.save(self.sc, dt_model_dir)
same_dt_model = DecisionTreeModel.load(self.sc, dt_model_dir)
self.assertEqual(same_dt_model.toDebugString(),
dt_model.toDebugString())
rf_model = RandomForest.trainClassifier(
rdd,
numClasses=2,
categoricalFeaturesInfo=categoricalFeaturesInfo,
numTrees=10,
maxBins=4,
seed=1)
self.assertTrue(rf_model.predict(features[0]) <= 0)
self.assertTrue(rf_model.predict(features[1]) > 0)
self.assertTrue(rf_model.predict(features[2]) <= 0)
self.assertTrue(rf_model.predict(features[3]) > 0)
rf_model_dir = os.path.join(temp_dir, "rf")
rf_model.save(self.sc, rf_model_dir)
same_rf_model = RandomForestModel.load(self.sc, rf_model_dir)
self.assertEqual(same_rf_model.toDebugString(),
rf_model.toDebugString())
gbt_model = GradientBoostedTrees.trainClassifier(
rdd,
categoricalFeaturesInfo=categoricalFeaturesInfo,
numIterations=4)
self.assertTrue(gbt_model.predict(features[0]) <= 0)
self.assertTrue(gbt_model.predict(features[1]) > 0)
self.assertTrue(gbt_model.predict(features[2]) <= 0)
self.assertTrue(gbt_model.predict(features[3]) > 0)
gbt_model_dir = os.path.join(temp_dir, "gbt")
gbt_model.save(self.sc, gbt_model_dir)
same_gbt_model = GradientBoostedTreesModel.load(self.sc, gbt_model_dir)
self.assertEqual(same_gbt_model.toDebugString(),
gbt_model.toDebugString())
try:
rmtree(temp_dir)
except OSError:
pass
#ArrDelay is our response
#ArrDelay becomes the 8tth column now, and total columns in the data = 12
label = clean_line_split[0]
nonLable = clean_line_split[1:]
return LabeledPoint (label, nonLable)
parsedData = raw_data.map (parsePoint)
#divide training and test data by 70-30 rule
(training, test) = parsedData.randomSplit([0.7, 0.3])
#start timer at this point
startTime = datetime.now()
#build the model
#empty categoricalFeaturesInfo indicates all features are continuous.
model = DecisionTree.trainRegressor (training, categoricalFeaturesInfo={},
impurity='variance', maxDepth=5, maxBins=32)
#evaluate model on test instances and compute test error
predictions = model.predict (test.map (lambda x: x.features))
labelsAndPredictions = test.map (lambda lp: lp.label).zip (predictions)
testMSE = labelsAndPredictions.map (lambda (v, p): (v - p) * (v - p)).sum() /\
float(testData.count())
print ('Time consumed = '), (datetime.now() - startTime)
print ('Test Mean Squared Error = ' + str (testMSE))
print ('Learned regression tree model:')
print (model.toDebugString())
#save and load model
model.save (sc, "DTR-Narrow-2008")
def test_regression(self):
from pyspark.mllib.regression import LinearRegressionWithSGD, LassoWithSGD, \
RidgeRegressionWithSGD
from pyspark.mllib.tree import DecisionTree, RandomForest, GradientBoostedTrees
data = [
LabeledPoint(-1.0, [0, -1]),
LabeledPoint(1.0, [0, 1]),
LabeledPoint(-1.0, [0, -2]),
LabeledPoint(1.0, [0, 2])
]
rdd = self.sc.parallelize(data)
features = [p.features.tolist() for p in data]
lr_model = LinearRegressionWithSGD.train(rdd, iterations=10)
self.assertTrue(lr_model.predict(features[0]) <= 0)
self.assertTrue(lr_model.predict(features[1]) > 0)
self.assertTrue(lr_model.predict(features[2]) <= 0)
self.assertTrue(lr_model.predict(features[3]) > 0)
lasso_model = LassoWithSGD.train(rdd, iterations=10)
self.assertTrue(lasso_model.predict(features[0]) <= 0)
self.assertTrue(lasso_model.predict(features[1]) > 0)
self.assertTrue(lasso_model.predict(features[2]) <= 0)
self.assertTrue(lasso_model.predict(features[3]) > 0)
rr_model = RidgeRegressionWithSGD.train(rdd, iterations=10)
self.assertTrue(rr_model.predict(features[0]) <= 0)
self.assertTrue(rr_model.predict(features[1]) > 0)
self.assertTrue(rr_model.predict(features[2]) <= 0)
self.assertTrue(rr_model.predict(features[3]) > 0)
categoricalFeaturesInfo = {0: 2} # feature 0 has 2 categories
dt_model = DecisionTree.trainRegressor(
rdd, categoricalFeaturesInfo=categoricalFeaturesInfo, maxBins=4)
self.assertTrue(dt_model.predict(features[0]) <= 0)
self.assertTrue(dt_model.predict(features[1]) > 0)
self.assertTrue(dt_model.predict(features[2]) <= 0)
self.assertTrue(dt_model.predict(features[3]) > 0)
rf_model = RandomForest.trainRegressor(
rdd,
categoricalFeaturesInfo=categoricalFeaturesInfo,
numTrees=10,
maxBins=4,
seed=1)
self.assertTrue(rf_model.predict(features[0]) <= 0)
self.assertTrue(rf_model.predict(features[1]) > 0)
self.assertTrue(rf_model.predict(features[2]) <= 0)
self.assertTrue(rf_model.predict(features[3]) > 0)
gbt_model = GradientBoostedTrees.trainRegressor(
rdd,
categoricalFeaturesInfo=categoricalFeaturesInfo,
numIterations=4)
self.assertTrue(gbt_model.predict(features[0]) <= 0)
self.assertTrue(gbt_model.predict(features[1]) > 0)
self.assertTrue(gbt_model.predict(features[2]) <= 0)
self.assertTrue(gbt_model.predict(features[3]) > 0)
try:
LinearRegressionWithSGD.train(rdd,
initialWeights=array([1.0, 1.0]),
iterations=10)
LassoWithSGD.train(rdd,
initialWeights=array([1.0, 1.0]),
iterations=10)
RidgeRegressionWithSGD.train(rdd,
initialWeights=array([1.0, 1.0]),
iterations=10)
except ValueError:
self.fail()
# Verify that maxBins is being passed through
GradientBoostedTrees.trainRegressor(
rdd,
categoricalFeaturesInfo=categoricalFeaturesInfo,
numIterations=4,
maxBins=32)
with self.assertRaises(Exception) as cm:
GradientBoostedTrees.trainRegressor(
rdd,
categoricalFeaturesInfo=categoricalFeaturesInfo,
numIterations=4,
maxBins=1)
def test_classification(self):
from pyspark.mllib.classification import LogisticRegressionWithSGD, SVMWithSGD, NaiveBayes
from pyspark.mllib.tree import DecisionTree, DecisionTreeModel, RandomForest,\
RandomForestModel, GradientBoostedTrees, GradientBoostedTreesModel
data = [
LabeledPoint(0.0, [1, 0, 0]),
LabeledPoint(1.0, [0, 1, 1]),
LabeledPoint(0.0, [2, 0, 0]),
LabeledPoint(1.0, [0, 2, 1])
]
rdd = self.sc.parallelize(data)
features = [p.features.tolist() for p in data]
temp_dir = tempfile.mkdtemp()
lr_model = LogisticRegressionWithSGD.train(rdd, iterations=10)
self.assertTrue(lr_model.predict(features[0]) <= 0)
self.assertTrue(lr_model.predict(features[1]) > 0)
self.assertTrue(lr_model.predict(features[2]) <= 0)
self.assertTrue(lr_model.predict(features[3]) > 0)
svm_model = SVMWithSGD.train(rdd, iterations=10)
self.assertTrue(svm_model.predict(features[0]) <= 0)
self.assertTrue(svm_model.predict(features[1]) > 0)
self.assertTrue(svm_model.predict(features[2]) <= 0)
self.assertTrue(svm_model.predict(features[3]) > 0)
nb_model = NaiveBayes.train(rdd)
self.assertTrue(nb_model.predict(features[0]) <= 0)
self.assertTrue(nb_model.predict(features[1]) > 0)
self.assertTrue(nb_model.predict(features[2]) <= 0)
self.assertTrue(nb_model.predict(features[3]) > 0)
categoricalFeaturesInfo = {0: 3} # feature 0 has 3 categories
dt_model = DecisionTree.trainClassifier(
rdd, numClasses=2, categoricalFeaturesInfo=categoricalFeaturesInfo, maxBins=4)
self.assertTrue(dt_model.predict(features[0]) <= 0)
self.assertTrue(dt_model.predict(features[1]) > 0)
self.assertTrue(dt_model.predict(features[2]) <= 0)
self.assertTrue(dt_model.predict(features[3]) > 0)
dt_model_dir = os.path.join(temp_dir, "dt")
dt_model.save(self.sc, dt_model_dir)
same_dt_model = DecisionTreeModel.load(self.sc, dt_model_dir)
self.assertEqual(same_dt_model.toDebugString(), dt_model.toDebugString())
rf_model = RandomForest.trainClassifier(
rdd, numClasses=2, categoricalFeaturesInfo=categoricalFeaturesInfo, numTrees=10,
maxBins=4, seed=1)
self.assertTrue(rf_model.predict(features[0]) <= 0)
self.assertTrue(rf_model.predict(features[1]) > 0)
self.assertTrue(rf_model.predict(features[2]) <= 0)
self.assertTrue(rf_model.predict(features[3]) > 0)
rf_model_dir = os.path.join(temp_dir, "rf")
rf_model.save(self.sc, rf_model_dir)
same_rf_model = RandomForestModel.load(self.sc, rf_model_dir)
self.assertEqual(same_rf_model.toDebugString(), rf_model.toDebugString())
gbt_model = GradientBoostedTrees.trainClassifier(
rdd, categoricalFeaturesInfo=categoricalFeaturesInfo, numIterations=4)
self.assertTrue(gbt_model.predict(features[0]) <= 0)
self.assertTrue(gbt_model.predict(features[1]) > 0)
self.assertTrue(gbt_model.predict(features[2]) <= 0)
self.assertTrue(gbt_model.predict(features[3]) > 0)
gbt_model_dir = os.path.join(temp_dir, "gbt")
gbt_model.save(self.sc, gbt_model_dir)
same_gbt_model = GradientBoostedTreesModel.load(self.sc, gbt_model_dir)
self.assertEqual(same_gbt_model.toDebugString(), gbt_model.toDebugString())
try:
rmtree(temp_dir)
except OSError:
pass
from pyspark.mllib.regression import LabeledPoint
from pyspark.mllib.tree import DecisionTree
from pyspark.mllib.util import MLUtils
# <codecell>
data = MLUtils.loadLibSVMFile(sc, '../data/sample_libsvm_data.txt').cache()
# <codecell>
# Train a DecisionTree model.
# Empty categoricalFeaturesInfo indicates all features are continuous.
model = DecisionTree.trainRegressor(data,
categoricalFeaturesInfo={},
impurity='variance',
maxDepth=5,
maxBins=100)
# <codecell>
# Evaluate model on training instances and compute training error
predictions = model.predict(data.map(lambda x: x.features))
labelsAndPredictions = data.map(lambda lp: lp.label).zip(predictions)
trainMSE = labelsAndPredictions.map(lambda (v, p): (v - p) *
(v - p)).sum() / float(data.count())
print('Training Mean Squared Error = ' + str(trainMSE))
print('Learned regression tree model:')
print(model)
# <codecell>
vector) #se precisar de feature do Feature Selection
data = pass2libsvm(reduced, sc.parallelize(classes))
#para a (5-tupla deveria ser algo como ) data=pass2libsvm(vector)
(trainingData, testData) = data.randomSplit([0.7, 0.3])
print 'data devided'
#trainingData = CorrelationFeature(sc.textFile('hdfs://master:9000/user/app/classes-16.out',15))
#testData = CorrelationFeature(sc.textFile('hdfs://master:9000/user/app/classes-25.out',15))
# Train a DecisionTree model.
# Empty categoricalFeaturesInfo indicates all features are continuous.
model = DecisionTree.trainClassifier(trainingData, numberClasses, {})
#, maxDepth=5, maxBins=32)
# let lrm be a LogisticRegression Model
#model.save(sc, "hdfs://master:9000/user/app/model-"+str(sys.argv[2]+".model"))
print 'model done'
#to load the model
#sameModel = DecisionTreeModel.load(sc, "lrm_model.model")
# Evaluate model on test instances and compute test error
predictions = model.predict(testData.map(lambda x: x.features))
labelsAndPredictions = testData.map(lambda lp: lp.label).zip(predictions)
metrics = MulticlassMetrics(labelsAndPredictions)
# Split each line into a list based on the comma delimiters
csvData = rawData.map(lambda x: x.split(","))
# Convert these lists to LabeledPoints
trainingData = csvData.map(createLabeledPoints)
# Create a test candidate, with 10 years of experience, currently employed,
# 3 previous employers, a BS degree, but from a non-top-tier school where
# he or she did not do an internship. You could of course load up a whole
# huge RDD of test candidates from disk, too.
testCandidates = [ array([10, 1, 3, 1, 0, 0])]
testData = sc.parallelize(testCandidates)
# Train our DecisionTree classifier using our data set
model = DecisionTree.trainClassifier(trainingData, numClasses=2,
categoricalFeaturesInfo={1:2, 3:4, 4:2, 5:2},
impurity='gini', maxDepth=5, maxBins=32)
# Now get predictions for our unknown candidates. (Note, you could separate
# the source data into a training set and a test set while tuning
# parameters and measure accuracy as you go!)
predictions = model.predict(testData)
print ('Hire prediction:')
results = predictions.collect()
for result in results:
print result
# We can also print out the decision tree itself:
print('Learned classification tree model:')
print(model.toDebugString())
header = train_rawDataWithHeader.first()
rawData = train_rawDataWithHeader.filter(lambda x: x != header)
rData = rawData.map(lambda x: x.replace("\"", ""))
train_data = rData.map(lambda x: x.split(","))
#test_data=prepare_data(test)
header = test_rawDataWithHeader.first()
rawData = test_rawDataWithHeader.filter(lambda x: x != header)
rData = rawData.map(lambda x: x.replace("\"", ""))
test_data = rData.map(lambda x: x.split(","))
lines=train_data+test_data
categoriesMap = lines.map(lambda fields: fields[0]).distinct().zipWithIndex().collectAsMap()
train_RDD=train_data.map(lambda r:LabeledPoint(extract_label(r),extract_features(r,categoriesMap,len(r)-1)))
test_RDD=test_data.map(lambda r: (extract_features(r,categoriesMap,len(r)-1),r[-1]))
model=DecisionTree.trainClassifier(train_RDD,numClasses=2,categoricalFeaturesInfo={},impurity='entropy',maxDepth=14,maxBins=9)
count = 0
num = 0
positive = 0
negative = 0
truePositive = 0
trueNegative =0
falsePositive = 0
falseNegative = 0
for data in test_RDD.take(test_data.count()):
num+=1
preds = int(model.predict(data[0]))
#print(str(preds)+' '+str(data[1]))
if(preds == int(data[1])):count=count+1
if int(data[1]) == 0: negative += 1
def main():
spark = SparkSession\
.builder\
.appName("PythonSQL")\
.config("spark.some.config.option", "some-value")\
.getOrCreate()
#Import a messed up DataFrame (DF) to get Column info
raw_df= sqlContext.read.format('com.databricks.spark.csv').options(header='true',inferchema='true') \
.load("/data/ganesh/BigData/Bosch/Source/train_numeric.csv.gz")
features = raw_df.columns
#Manually specify the correct datatypes for each Column and import new DF
fields = [
StructField(field_name, FloatType(), True) for field_name in features
]
fields[0].dataType = IntegerType()
fields[-1].dataType = IntegerType()
customSchema = StructType(fields)
df = sqlContext.read.format('com.databricks.spark.csv').options(header='true') \
.load("/data/ganesh/BigData/Bosch/Source/train_numeric.csv.gz",schema = customSchema)
df.na.fill(NaN)
#Prepare feature for computation!
#Remove features from a list precompiled on correlation criterion!
counter = 0
with open('column_refine_list.csv', 'r') as f:
csvlist = csv.reader(f, delimiter=',')
for item in csvlist:
column_to_go = item[:]
print("Total numer of features to be removed: %d" % (len(column_to_go)))
print("\n")
for item in column_to_go:
df = df.drop(item)
print("Final number of features is: %d" % (len(df.columns[1:-1])))
#Decision Tree model Training
training_points = labelData(df) #csv_numeric.map(ReducedlabelData)
training_data, test_data = training_points.randomSplit([0.7, 0.3])
print(training_data.first())
t0 = time()
tree_model = DecisionTree.trainClassifier(training_data,
numClasses=2,
categoricalFeaturesInfo={},
impurity='gini',
maxDepth=04,
maxBins=100)
tt = time() - t0
tree_model.save(
sc, "DTmodel_model_reduced_222red") #Save the model for future use!
print("Model trained in : %.4f Sec" % (tt))
print(tree_model.toDebugString())
#Making predictions on the test set
## Predict
t0 = time()
labels_and_preds = getLabelsPredictions(tree_model, test_data)
test_accuracy = 100 * labels_and_preds.filter(
lambda (v, p): v == p).count() / float(test_data.count())
print("Test accuracy is : %.4f " % (test_accuracy))
printMCC(labels_and_preds)
tt = time() - t0
print("Predictions and metrics computed in : %.4f Sec" % (tt))
features_new = raw_df.columns
#Manually specify the correct datatypes for each Column and import new DF
fields = [
StructField(field_name, FloatType(), True)
for field_name in features_new
]
fields[0].dataType = IntegerType()
fields[-1].dataType = IntegerType()
customSchema = StructType(fields)
df.select(
df.columns
).write.format('com.databricks.spark.csv').options(header='true').save(
'/data/ganesh/BigData/Bosch/Source/feature_reduction/numeric/feature_reduction_V2/df_739.csv',
schema=customSchema)
sc.stop()
# 查看資料前處理結果
# print(labelpointRDD.first())
# 以randomSplit隨機方式，依照3：1 (75％：25％) 比例，將資料分為train set與test set
(trainData, testData) = labelpointRDD.randomSplit([3, 1])
# print(testData.count())
# 為加快程式的執行效率，將train set與test set暫存在記憶體中
trainData.persist()
testData.persist()
# tune參數
params = [5, 10, 15, 20]
for i in params:
# 使用Spark MLlib支援的決策樹
model = DecisionTree.trainClassifier(trainData, numClasses=2, categoricalFeaturesInfo={}, impurity="entropy", maxDepth=i, maxBins=15)
# 使用model.predict對testDat作預測
score = model.predict(testData.map(lambda p: p.features))
# 印出預測的結果
# score.foreach(print)
print(score.collect()) # all
# print(score.take(2)) # first two
# print(score.count()) # 有幾筆
# 將預測結果與真實label結合起來
scoreAndLabels = score.zip(testData.map(lambda p: p.label))
# 使用MulticlassMetrics做出confusionMatrix，計算Accuracy，Recall，Precision
metrics = MulticlassMetrics(scoreAndLabels)
print(metrics.confusionMatrix())
print("Accuracy = %s" % metrics.accuracy)
print("Recall = %s" % metrics.recall(0))
print("Precision = %s" % metrics.precision(0))
def test_all(self, measure_columns=None, dimension_columns=None):
if dimension_columns is None:
dimensions = self._dimension_columns
self._target_dimension = measure_columns[0]
dimension = self._target_dimension
max_num_levels = GLOBALSETTINGS.DTREE_OTHER_DIMENSION_MAX_LEVEL
max_num_levels = min(max_num_levels,
round(self._dataframe_helper.get_num_rows()**0.5))
# all_dimensions = [dim for dim in self._dimension_columns if self._dataframe_helper.get_num_unique_values(dim) <= max_num_levels]
all_dimensions = [
dim for dim in self._dimension_columns
if self._metaParser.get_num_unique_values(dim) <= max_num_levels
]
all_measures = [
x for x in self._measure_columns if x != self._target_dimension
]
self.transform_data_frames()
decision_tree_result = DecisionTreeResult()
cat_feature_info = [len(self._mapping_dict[c]) for c in all_dimensions]
if len(cat_feature_info) > 0:
max_length = max(cat_feature_info)
else:
max_length = 32
cat_feature_info = dict(enumerate(cat_feature_info))
# print cat_feature_info
if self._pandas_flag:
dimension_classes = self._data_frame[dimension].nunique()
self._data_frame = self._data_frame[[dimension] + all_dimensions +
all_measures]
x = self._data_frame.drop(dimension, axis=1)
y = self._data_frame[dimension]
for i in x.columns:
x[i] = x[i].fillna(x[i].mode()[0])
model = DecisionTreeRegressor(max_depth=6)
model = model.fit(x, y)
output_result = self.tree_to_code(model, list(x.columns))
output_result = list(map(lambda x: x.strip(), output_result))
print(output_result, "output_result")
else:
dimension_classes = self._data_frame.select(
dimension).distinct().count()
self._data_frame = self._data_frame[[dimension] + all_dimensions +
all_measures]
data = self._data_frame.rdd.map(
lambda x: LabeledPoint(x[0], x[1:]))
(trainingData, testData) = data.randomSplit([1.0, 0.0])
# TO DO : set maxBins at least equal to the max level of categories in dimension column
model = DecisionTree.trainClassifier(
trainingData,
numClasses=dimension_classes,
categoricalFeaturesInfo=cat_feature_info,
impurity='gini',
maxDepth=6,
maxBins=max_length)
output_result = model.toDebugString()
decision_tree = self.tree_json(output_result, self._data_frame,
self._pandas_flag)
self._new_tree = self.generate_new_tree(decision_tree)
node_list = self.node_name_extractor(self._new_tree)
node_list = list(self.flatten(node_list))
correct_count_list = [i[0] for i in self._count_list]
tree_dict = dict(list(zip(node_list, correct_count_list)))
#self._new_tree = self.generate_new_tree_total(decision_tree)
self._new_tree = self.wrap_tree(self._new_tree, tree_dict)
self._path_dict = self.path_dict_creator(node_list, self._new_tree)
# self._new_tree = utils.recursiveRemoveNullNodes(self._new_tree)
# decision_tree_result.set_params(self._new_tree, self._new_rules, self._total, self._success, self._probability)
decision_tree_result.set_params(self._new_tree, self._new_rules,
self._total, self._success,
self._probability, self._path_dict)
decision_tree_result.set_target_map(
self._mapping_dict[self._target_dimension], self._aggr_data,
self._important_vars)
# self._completionStatus += self._scriptWeightDict[self._analysisName]["script"]*self._scriptStages["dtreeTrainingStart"]["weight"]/10
# progressMessage = CommonUtils.create_progress_message_object(self._analysisName,\
# "dtreeTrainingEnd",\
# "info",\
# self._scriptStages["dtreeTrainingEnd"]["summary"],\
# self._completionStatus,\
# self._completionStatus)
# CommonUtils.save_progress_message(self._messageURL,progressMessage)
# self._dataframe_context.update_completion_status(self._completionStatus)
CommonUtils.create_update_and_save_progress_message(
self._dataframe_context,
self._scriptWeightDict,
self._scriptStages,
self._analysisName,
"dtreeTrainingEnd",
"info",
weightKey="script")
# print decision_tree_result
return decision_tree_result
from numpy import array
from pyspark.mllib.regression import LabeledPoint
from pyspark.mllib.tree import DecisionTree
from pyspark import SparkContext
sc = SparkContext.getOrCreate()
data = [
LabeledPoint(0.0, [0.0]),
LabeledPoint(1.0, [1.0]),
LabeledPoint(1.0, [2.0]),
LabeledPoint(1.0, [3.0])
]
model = DecisionTree.trainClassifier(sc.parallelize(data), 2, {})
print(model)
# <codecell>
from pyspark.mllib.regression import LabeledPoint
from pyspark.mllib.tree import DecisionTree
from pyspark.mllib.util import MLUtils
# <codecell>
data = MLUtils.loadLibSVMFile(sc, '../data/sample_libsvm_data.txt').cache()
data.take(5)
# <codecell>
# Train a DecisionTree model.
# Empty categoricalFeaturesInfo indicates all features are continuous.
model = DecisionTree.trainClassifier(data, numClasses=2, categoricalFeaturesInfo={},
impurity='gini', maxDepth=5, maxBins=100)
# <codecell>
predictions = model.predict(data.map(lambda x: x.features))
labelsAndPredictions = data.map(lambda lp: lp.label).zip(predictions)
labelsAndPredictions.take(10)
# <codecell>
trainErr = labelsAndPredictions.filter(lambda (v, p): v != p).count() / float(data.count())
print('Training Error = ' + str(trainErr))
print('Learned classification tree model:')
print(model)
# <codecell>
