def basic_example(spark, resources_folder):
data = spark.read.format('libsvm').load(resources_folder +
'sample_libsvm_data.txt')
data.printSchema()
data.show()
train_data, test_data = data.randomSplit([0.6, 0.4])
dtc = DecisionTreeClassifier()
rfc = RandomForestClassifier()
gbtc = GBTClassifier()
dtc_model = dtc.fit(train_data)
rfc_model = rfc.fit(train_data)
gbtc_model = gbtc.fit(train_data)
dtc_predictions = dtc_model.transform(test_data)
rfc_predictions = rfc_model.transform(test_data)
gbtc_predictions = gbtc_model.transform(test_data)
dtc_predictions.show()
rfc_predictions.show()
# GBT No tiene rawPrediction Column, si esta haciendo un predictor de clasificacion binaria o multiclasificacion
# puede que pida el rawPrediction como un input
gbtc_predictions.show()
acc_eval = MulticlassClassificationEvaluator(metricName='accuracy')
print("DTC Accuracy")
print(acc_eval.evaluate(dtc_predictions))
print("RFC Accuracy")
print(acc_eval.evaluate(rfc_predictions))
print("GBTC Accuracy")
print(acc_eval.evaluate(gbtc_predictions))
print(rfc_model.featureImportances)
def gradient_boosted_tree_classifier(training_data, test_data, validation_data):
# ROC: 0.71
gbt = GBTClassifier(featuresCol='scaled_features', labelCol='label', maxIter=10)
gbtModel = gbt.fit(training_data)
predict_valid = gbtModel.transform(validation_data)
# predict_train = gbtModel.transform(training_data)
predict_valid.show(5)
evaluate_metrics(predict_valid)
evaluator = BinaryClassificationEvaluator(rawPredictionCol="rawPrediction", labelCol='label',
metricName="areaUnderROC")
model_evaluator(evaluator=evaluator, evaluator_name="areaUnderROC", data=predict_valid,
data_type="valid_data")
paramGrid = (ParamGridBuilder()
.addGrid(gbt.maxDepth, [2, 4, 6])
.addGrid(gbt.maxBins, [20, 60])
.addGrid(gbt.maxIter, [10, 20])
.build())
cv = CrossValidator(estimator=gbt, estimatorParamMaps=paramGrid, evaluator=evaluator, numFolds=5)
# Run cross validations.
cvModel = cv.fit(training_data)
predict_cross_valid = cvModel.transform(validation_data)
model_evaluator(evaluator=evaluator, evaluator_name="areaUnderROC", data=predict_cross_valid,
data_type="valid_data")
predict_final = cvModel.bestModel.transform(test_data)
model_evaluator(evaluator=evaluator, evaluator_name="areaUnderROC", data=predict_final,
data_type="test_data")
def gbt(df, columns, input_col, **kwargs):
"""
Runs a gradient boosting tree classifier for input DataFrame.
:param df: Pyspark dataframe to analyze.
:param columns: List of columns to select for prediction.
:param input_col: Column to predict.
:return: DataFrame with gradient boosting tree and prediction run.
"""
if not is_dataframe(df):
raise TypeError("Spark dataframe expected")
columns = parse_columns(df, columns)
if not is_str(input_col):
raise TypeError("Error, input column must be a string")
data = df.select(columns)
feats = data.columns
feats.remove(input_col)
df = string_to_index(df, input_cols=input_col)
df = vector_assembler(df, input_cols=feats, output_col="features")
model = GBTClassifier(**kwargs)
df = df.cols.rename(name_col(input_col, "index_to_string"), "label")
gbt_model = model.fit(df)
df_model = gbt_model.transform(df)
return df_model, gbt_model
def gbtClassifier(train, test):
gbt = GBTClassifier(maxIter=10)
gbtModel = gbt.fit(train)
predictions = gbtModel.transform(test)
predictions.select('age', 'job', 'label', 'rawPrediction', 'prediction',
'probability').show(10)
return predictions
def gbt(df, columns, input_col):
"""
Runs a gradient boosting tree classifier for input DataFrame.
:param df: Pyspark dataframe to analyze.
:param columns: List of columns to select for prediction.
:param input_col: Column to predict.
:return: DataFrame with gradient boosting tree and prediction run.
"""
assert_spark_df(df)
assert isinstance(columns, list), "Error, columns must be a list"
assert isinstance(input_col, str), "Error, input column must be a string"
data = df.select(columns)
feats = data.columns
feats.remove(input_col)
transformer = op.DataFrameTransformer(data)
transformer.string_to_index(input_cols=input_col)
transformer.vector_assembler(input_cols=feats)
model = GBTClassifier()
transformer.rename_col(columns=[(input_col + "_index", "label")])
gbt_model = model.fit(transformer.df)
df_model = gbt_model.transform(transformer.df)
return df_model, gbt_model
def gbdtClassification(df,arguments): from pyspark.ml.classification import GBTClassifier numTrees = 20 stepSize = 0.1 maxDepth = 5 minInstancesPerNode = 1 if arguments.maxDepth != None: maxDepth = float(arguments.maxDepth) if arguments.minInstancesPerNode != None: minInstancesPerNode = float(arguments.minInstancesPerNode) if arguments.numTrees != None: numTrees = float(arguments.numTrees) if arguments.stepSize != None: stepSize = float(arguments.stepSize) gbdt = GBTClassifier(maxIter=numTrees, stepSize=stepSize, maxDepth=maxDepth, minInstancesPerNode=minInstancesPerNode) model = gbdt.fit(df) return model
def exec_gradient_boost(self,
featuresCol1="features",
labelCol1="label",
predictionCol1="prediction",
maxIter1=30,
numClass1=2):
'''
Creates the Gradient Boost model Pipeline, this model is only applicable to binary classification problems
Input: featureCol1: feature column name, labelCol: label column name, predictionCol1: prediction column name
model parameters: {maximum number of iterations}, numClass1: number of class labels restricted to 2
Output: None
'''
#Initialize GradientBoost Model with parameters passed
gb = GBTClassifier(featuresCol=featuresCol1,
labelCol=labelCol1,
predictionCol=predictionCol1,
maxIter=maxIter1)
#Fit gradient boost model with training data
gbModel = gb.fit(self.trainingData)
#Make nb model predictions on testData
predictions = gbModel.transform(self.testData)
#Evaluate the results generated by the model prediction
self.model_evaluator(predictions,
modelType="GradientBoost Model",
modelParams=str({'maxIter': maxIter1}),
numClass=numClass1)
def evaluateGradientBoostTree(trainDF ,testDF):
for stepsize in [0.01 ,0.1 ,1]:
classifier = GBTClassifier(stepSize=stepsize)
model = classifier.fit(trainDF)
predictions = model.transform(testDF)
print("Gradient Boost Tree with stepsize : {}".format(stepsize))
printevaluatation(model,predictions)
def test_gbt_classifier(self):
raw_data = self.spark.createDataFrame([
(1.0, Vectors.dense(1.0)),
(0.0, Vectors.sparse(1, [], []))
], ["label", "features"])
string_indexer = StringIndexer(inputCol="label", outputCol="indexed")
si_model = string_indexer.fit(raw_data)
data = si_model.transform(raw_data)
gbt = GBTClassifier(maxIter=5, maxDepth=2, labelCol="indexed", seed=42)
model = gbt.fit(data)
feature_count = data.first()[1].size
model_onnx = convert_sparkml(model, 'Sparkml GBT Classifier', [
('features', FloatTensorType([1, feature_count]))
], spark_session=self.spark)
self.assertTrue(model_onnx is not None)
# run the model
predicted = model.transform(data)
data_np = data.toPandas().features.apply(lambda x: pandas.Series(x.toArray())).values.astype(numpy.float32)
expected = [
predicted.toPandas().prediction.values.astype(numpy.float32),
predicted.toPandas().probability.apply(lambda x: pandas.Series(x.toArray())).values.astype(numpy.float32)
]
paths = save_data_models(data_np, expected, model, model_onnx,
basename="SparkmlGBTClassifier")
onnx_model_path = paths[3]
output, output_shapes = run_onnx_model(['prediction', 'probability'], data_np, onnx_model_path)
compare_results(expected, output, decimal=5)
def run_gradient_boost(tn_data, ts_data):
gbt = GBTClassifier(featuresCol="scaled_features",
labelCol="output",
predictionCol="prediction")
gbtModel = gbt.fit(tn_data)
predictions = gbtModel.transform(ts_data)
print_perf_eval(predictions)
def transform_predictions(dataframe, spark):
df_transformed = dataframe.drop("Patient addmited to regular ward (1=yes, 0=no)",
"Patient addmited to semi-intensive unit (1=yes, 0=no)",
"Patient addmited to intensive care unit (1=yes, 0=no)")
df_transformed_no_missing = dismiss_missing_values(df_transformed)
# build the dataset to be used as a rf_model base
outcome_features = ["SARS-Cov-2 exam result"]
required_features = ['Hemoglobin', 'Hematocrit', 'Platelets', 'Eosinophils', 'Red blood Cells', 'Lymphocytes',
'Leukocytes', 'Basophils', 'Monocytes']
assembler = VectorAssembler(inputCols=required_features, outputCol='features')
model_data = assembler.transform(df_transformed_no_missing)
# split the dataset into train/test subgroups
(training_data, test_data) = model_data.randomSplit([0.8, 0.2], seed=2020)
# Random Forest classifier
rf = RandomForestClassifier(labelCol='SARS-Cov-2 exam result', featuresCol='features', maxDepth=5)
rf_model = rf.fit(training_data)
rf_predictions = rf_model.transform(test_data)
multi_evaluator = MulticlassClassificationEvaluator(labelCol='SARS-Cov-2 exam result', metricName='accuracy')
rf_accuracy = multi_evaluator.evaluate(rf_predictions)
# Decision Tree Classifier
dt = DecisionTreeClassifier(featuresCol='features', labelCol='SARS-Cov-2 exam result', maxDepth=3)
dt_model = dt.fit(training_data)
dt_predictions = dt_model.transform(test_data)
dt_predictions.select(outcome_features + required_features).show(10)
multi_evaluator = MulticlassClassificationEvaluator(labelCol='SARS-Cov-2 exam result', metricName='accuracy')
dt_accuracy = multi_evaluator.evaluate(dt_predictions)
# Logistic Regression Model
lr = LogisticRegression(featuresCol='features', labelCol='SARS-Cov-2 exam result', maxIter=10)
lr_model = lr.fit(training_data)
lr_predictions = lr_model.transform(test_data)
multi_evaluator = MulticlassClassificationEvaluator(labelCol='SARS-Cov-2 exam result', metricName='accuracy')
lr_accuracy = multi_evaluator.evaluate(lr_predictions)
# Gradient-boosted Tree classifier Model
gb = GBTClassifier(labelCol='SARS-Cov-2 exam result', featuresCol='features')
gb_model = gb.fit(training_data)
gb_predictions = gb_model.transform(test_data)
multi_evaluator = MulticlassClassificationEvaluator(labelCol='SARS-Cov-2 exam result', metricName='accuracy')
gb_accuracy = multi_evaluator.evaluate(gb_predictions)
rdd = spark.sparkContext.parallelize([rf_accuracy, dt_accuracy, lr_accuracy, gb_accuracy])
predictions_dataframe = spark.createDataFrame(rdd, FloatType())
return predictions_dataframe
def universities_example(spark, resources_folder):
data = spark.read.csv(resources_folder + 'College.csv',
header=True,
inferSchema=True)
data.printSchema()
data.show()
assembler = VectorAssembler(inputCols=[
'Apps', 'Accept', 'Enroll', 'Top10perc', 'Top25perc', 'F_Undergrad',
'P_Undergrad', 'Outstate'
'Room_Board', 'Books', 'Personal', 'PhD', 'Terminal', 'S_F_Ratio',
'perc_alumni', 'Expend', 'Grad_Rate'
],
outputCol='features')
data_assembled = assembler.transform(data)
private_state_indexer = StringIndexer(inputCol='Private',
outputCol='PrivateIndex')
data_transformed = private_state_indexer.fit(data_assembled).transform(
data_assembled)
train_data, test_data = data_transformed.select(
['features', 'PrivateIndex']).randomSplit([0.6, 0.4])
dtc = DecisionTreeClassifier(labelCol='PrivateIndex',
featuresCol='features')
rfc = RandomForestClassifier(labelCol='PrivateIndex',
featuresCol='features')
gbtc = GBTClassifier(labelCol='PrivateIndex', featuresCol='features')
dtc_college_model = dtc.fit(train_data)
rfc_college_model = rfc.fit(train_data)
gbtc_college_model = gbtc.fit(train_data)
dtc_predictions = dtc_college_model.transform(test_data)
rfc_predictions = rfc_college_model.transform(test_data)
gbtc_predictions = gbtc_college_model.transform(test_data)
my_binary_evaluator = BinaryClassificationEvaluator(
labelCol='PrivateIndex')
print("DTC Evaluator")
print(my_binary_evaluator.evaluate(dtc_predictions))
print("RFC Evaluator")
print(my_binary_evaluator.evaluate(rfc_predictions))
print("DTC Evaluator")
my_binary_evaluator = BinaryClassificationEvaluator(
labelCol='PrivateIndex', rawPredictionCol='prediction')
print(my_binary_evaluator.evaluate(gbtc_predictions))
# No se puede hacer una evaluación del accuracy con un BinaryClassificationEvaluator para eso toca usar un
# MulticlassClassificationEvaluator
acc_eval = MulticlassClassificationEvaluator(labelCol='PrivateIndex',
metricName='accuracy')
rfc_accuracy = acc_eval.evaluate(rfc_predictions)
print(rfc_accuracy)
def testClassification(train, test):
# Train a GradientBoostedTrees model.
rf = GBTClassifier(maxIter=30, maxDepth=4, labelCol="indexedLabel")
model = rf.fit(train)
predictionAndLabels = model.transform(test).select("prediction", "indexedLabel") \
.map(lambda x: (x.prediction, x.indexedLabel))
metrics = BinaryClassificationMetrics(predictionAndLabels)
print("AUC %.3f" % metrics.areaUnderROC)
def testClassification(train, test):
# Train a GradientBoostedTrees model.
rf = GBTClassifier(maxIter=30, maxDepth=4, labelCol="indexedLabel")
model = rf.fit(train)
predictionAndLabels = model.transform(test).select("prediction", "indexedLabel") \
.map(lambda x: (x.prediction, x.indexedLabel))
metrics = BinaryClassificationMetrics(predictionAndLabels)
print("AUC %.3f" % metrics.areaUnderROC)
def gradientBoosting(df,
feature_list=['BFSIZE', 'HDRSIZE', 'NODETYPE'],
maxIter=20,
stepSize=0.1):
# Checks if there is a SparkContext running if so grab that if not start a new one
# sc = SparkContext.getOrCreate()
# sqlContext = SQLContext(sc)
# sqlContext.setLogLevel('INFO')
vector_assembler = VectorAssembler(inputCols=feature_list,
outputCol="features")
df_temp = vector_assembler.transform(df)
df = df_temp.select(['label',
'features']).withColumnRenamed('label', 'label')
(trainingData, testData) = df.randomSplit([0.7, 0.3])
gbt = GBTClassifier(labelCol="label", featuresCol="features", maxIter=10)
model = gbt.fit(trainingData)
predictions = model.transform(testData)
#predictions.select("prediction", "label").show(40)
evaluator = BinaryClassificationEvaluator(labelCol="label")
# accuracy = evaluator.evaluate(predictions, {evaluator.metricName:"Precision"})
auc = evaluator.evaluate(predictions)
# test distribution of outputs
total = df.select('label').count()
disk = df.filter(df.label == 0).count()
cloud = df.filter(df.label == 1).count()
# print outputs
print('Gradient-Boosted Tree')
print(' Cloud %{}'.format((cloud / total) * 100))
print(' Disk %{}'.format((disk / total) * 100))
print(feature_list)
# print(" Test Error = {}".format((1.0 - accuracy) * 100))
# print(" Test Accuracy = {}\n".format(accuracy * 100))
print(" Test AUC = {}\n".format(auc * 100))
misses = predictions.filter(predictions.label != predictions.prediction)
# now get percentage of error
disk_misses = misses.filter(misses.label == 0).count()
cloud_misses = misses.filter(misses.label == 1).count()
print(' Cloud Misses %{}'.format((cloud_misses / cloud) * 100))
print(' Disk Misses %{}'.format((disk_misses / disk) * 100))
return auc, 'Gradient Boosted: {}'.format(auc), model
def gbt_classifier(training, testing):
from pyspark.ml.classification import GBTClassifier
# Train a GBT model.
gbt = GBTClassifier(maxIter=10)
# Train model. This also runs the indexers.
gbt_model = gbt.fit(training)
# Make predictions.
gbt_predictions = gbt_model.transform(testing)
#Evaluate model
gbt_evaluator = MulticlassClassificationEvaluator(metricName='accuracy')
gbt_accuracy = gbt_evaluator.evaluate(gbt_predictions)
return gbt_accuracy
def main():
spark = SparkSession \
.builder \
.appName("RandomForest") \
.config("spark.executor.heartbeatInterval", "60s") \
.getOrCreate()
sc = spark.sparkContext
sqlContext = SQLContext(sc)
sc.setLogLevel("INFO")
# Loading the test data
df_test = spark.read.parquet(sys.argv[1])
df_test, df_train = df_test.randomSplit([0.3, 0.7])
df_train_indexed=df_train.selectExpr("label as indexedLabel","features as indexedFeatures")
df_test_indexed=df_test.selectExpr("label as indexedLabel","features as indexedFeatures")
# # Load the model
# rf_model = RandomForestClassificationModel.load(sys.argv[2])
#
# # Make the predictions
# predictions = rf_model.transform(df_test)
gbt = GBTClassifier(labelCol="indexedLabel", featuresCol="indexedFeatures", maxIter=100,maxBins=24000000)
model=gbt.fit(df_train_indexed)
predictions = model.transform(df_test_indexed)
# predictionsRDD=predictions.rdd
# predictionsRDD.saveAsTextFile(sys.argv[3]+"output.text")
evaluator_acc = MulticlassClassificationEvaluator(predictionCol="prediction", labelCol="indexedLabel",
metricName="accuracy")
accuracy = evaluator_acc.evaluate(predictions)
print "accuracy *******************"
print accuracy
evaluator_pre = MulticlassClassificationEvaluator(predictionCol="prediction", labelCol="indexedLabel",
metricName="weightedPrecision")
print "precision *******************"
print evaluator_pre.evaluate(predictions)
print "recall **********************"
print MulticlassClassificationEvaluator(predictionCol="prediction", labelCol="indexedLabel",
metricName="weightedRecall").evaluate(predictions)
def evaluateGradientBoostTree(trainDF ,testDF):
"""
Traning by gradient boost tree classifiers with some stepSize
params
it returns bechmarkdata list for stepSize params
"""
benchmarkData = []
for stepsize in [0.1]:
classifier = GBTClassifier(stepSize=stepsize)
model = classifier.fit(trainDF)
predictions = model.transform(testDF)
print("Gradient Boost Tree with stepsize : {}".format(stepsize))
accuracy = printevaluatation(model,predictions)
benchmarkData += [("GBT", "sitepsize" ,stepsize ,float(accuracy))]
return benchmarkData
def gbdt_core(df, condition):
"""
gdbt二分类核心函数
:param spark_session:
:param df:
:param condition:{"label": "标签", "features": ["数量", "折扣", "利润", "装运成本"], "iterations": 20, "step": 0.1, "maxDepth": 5, "minInstancesPerNode": 1, "seed": 1}
:return:
"""
# 参数
label_index = condition['label'] # 标签列(列名或列号)
feature_indexs = condition['features'] # 特征列(列名或列号)
iterations = condition['iterations'] # 迭代次数
step = condition['step'] # 学习速率(0-1)
max_depth = condition['maxDepth'] # 数的最大深度[1,100]
minInstancesPerNode = condition['minInstancesPerNode'] # 叶子节点最少样本数[1,1000]
seed = condition['seed'] # 随机数产生器种子[0,10]
# 1. 准备数据
def func(x):
features_data = []
for feature in feature_indexs:
features_data.append(x[feature])
return Row(label=x[label_index], features=Vectors.dense(features_data))
training_set = df.rdd.map(lambda x: func(x)).toDF()
string_indexer = StringIndexer(inputCol="label", outputCol="indexed")
si_model = string_indexer.fit(training_set)
tf = si_model.transform(training_set)
# 2. 训练
gbdt = GBTClassifier(labelCol="indexed",
maxIter=iterations,
stepSize=step,
maxDepth=max_depth,
minInstancesPerNode=minInstancesPerNode,
seed=seed)
gbdt_model = gbdt.fit(tf)
print(gbdt_model.featureImportances)
# 3.保存模型
svm_model_path = model_url() + '/gbdt/' + str(uuid.uuid1())
deltree(svm_model_path) # 删除已经存在的模型
gbdt_model.write().overwrite().save(svm_model_path)
return svm_model_path
def _get_xgboost_classifier_model(col, train):
'''
Gradient Boosted Tree Classifier Model is created for predicting Missing Values
'''
print(
'Using Gradient Boosted Regressor Module to predict Missing Values ...'
)
cla_model = GBTClassifier(labelCol=col)
#params = ParamGridBuilder().addGrid(cla_model.maxDepth, [5, 10, 20]).\
# addGrid(cla_model.minInfoGain, [0.0, 0.01, 1.0]).\
# addGrid(cla_model.maxBins, [32, 20, 50, 100, 300]).build()
#cv = CrossValidator(estimator=cla_model,
# estimatorParamMaps=params,
# evaluator=BinaryClassificationEvaluator(labelCol=col),
# numFolds=10)
cla_model = cla_model.fit(train)
return cla_model
def model_dev_gbm(df_train, df_test, max_depth, max_bins, max_iter):
gbm_start_time = time()
# Create an Initial Model Instance
mod_gbm= GBTClassifier(labelCol='label',
featuresCol='features',
maxDepth=max_depth,
maxBins=max_bins,
maxIter=max_iter)
# Training The Model
gbm_final_model = mod_gbm.fit(df_train)
# Scoring The Model On Test Sample
gbm_transformed = gbm_final_model.transform(df_test)
gbm_test_results = gbm_transformed.select(['prediction', 'label'])
gbm_predictionAndLabels= gbm_test_results.rdd
gbm_test_metrics = MulticlassMetrics(gbm_predictionAndLabels)
# Collecting The Model Statistics
gbm_cm=gbm_test_metrics.confusionMatrix().toArray()
gbm_accuracy=round(float((gbm_cm[0][0]+gbm_cm[1][1])/gbm_cm.sum())*100,2)
gbm_precision=round(float((gbm_cm[0][0])/(gbm_cm[0][0]+gbm_cm[1][0]))*100,2)
gbm_recall=round(float((gbm_cm[0][0])/(gbm_cm[0][0]+gbm_cm[0][1]))*100,2)
gbm_auc = round(float(BinaryClassificationMetrics(gbm_predictionAndLabels).areaUnderROC)*100,2)
# Printing The Model Statitics
print("\n++++++ Printing GBM Model Accuracy ++++++\n")
print("Accuracy: "+str(gbm_accuracy)+"%")
print("AUC: "+str(gbm_auc)+"%")
print("Precision: "+str(gbm_precision)+"%")
print("Recall: "+str(gbm_recall)+"%")
gbm_end_time = time()
gbm_elapsed_time = (gbm_end_time - gbm_start_time)/60
gbm_model_stat = pd.DataFrame({"Model Name" : ["Gradient Boosting Machine"],
"Accuracy" : gbm_accuracy,
"AUC": gbm_auc,
"Precision": gbm_precision,
"Recall": gbm_recall,
"Time (Min.)": round(gbm_elapsed_time,3)})
gbm_output = (gbm_final_model,gbm_model_stat,gbm_cm)
print("Time To Build GBM Model: %.3f Minutes" % gbm_elapsed_time)
return(gbm_output)
def predictions(train, test):
#Aplicamos la tecnica de GBT
GPT = GBTClassifier(featuresCol="Atributos", labelCol="Income", maxBins=41)
GPT = GPT.fit(train)
predictions = GPT.transform(test)
results = predictions.select("Income", "prediction")
predictionAndLabels = results.rdd
metrics = MulticlassMetrics(predictionAndLabels)
cm = metrics.confusionMatrix().toArray()
#Calculo de metricas
accuracy = (cm[0][0] + cm[1][1]) / cm.sum()
precision = cm[0][0] / (cm[0][0] + cm[1][0])
recall = cm[0][0] / (cm[0][0] + cm[0][1])
f1 = 2 * ((precision * recall) / (precision + recall))
print("Metricas del modelo GBT Classifier")
print("accuracy = {0}, precision = {1}, recall = {2}, f1 = {3}".format(
accuracy, precision, recall, f1))
return
def embedding(DF, inputCol="stemmed"):
evaluator = BinaryClassificationEvaluator(rawPredictionCol="rawPrediction")
word2vec = Word2Vec(inputCol=inputCol, outputCol='features')
model = word2vec.fit(DF)
resultDF = model.transform(DF)
dftrain, dftest = resultDF.randomSplit([0.80, 0.20])
gbt = GBTClassifier(maxDepth=5)
model = gbt.fit(dftrain)
predictions = model.transform(dftest)
score = evaluator.evaluate(predictions)
accuracy = predictions.filter(predictions.label == predictions.prediction
).count() / predictions.count()
return {
'embeddingmodel': model,
'predictions': predictions,
'areaUnderROC': score,
'accuracy': accuracy
}
def spark_gbdt(train_file, test_file, features_columns='userID'):
from pyspark.ml.classification import GBTClassifier
from pyspark.ml.feature import StringIndexer, VectorIndexer, VectorAssembler
from pyspark.ml.pipeline import Pipeline
sess = get_spark_sesssion()
string_indexer = StringIndexer(inputCol="label", outputCol="idx_label")
v_c = VectorAssembler(inputCols=['userID'], outputCol='v_userID')
trans = Pipeline(stages=[string_indexer, v_c])
gbdt = GBTClassifier(maxDepth=5,
labelCol="idx_label",
predictionCol="pred",
featuresCol='v_userID',
seed=42,
maxMemoryInMB=1024 * 10,
maxIter=4)
train = sess.read.load(
train_file,
format='csv',
header=True,
inferSchema=True,
)
train_data = trans.fit(train).transform(train)
model = gbdt.fit(train_data)
model.write().overwrite().save('gbtc.model')
# model = GBTClassifier.load('gbtc.model')
print(model.featureImportances)
test = sess.read.load(test_file,
format='csv',
header=True,
inferSchema=True)
test_data = trans.fit(test).transform(test)
predict = model.transform(test_data)
predict.show()
save_pandas(predict.select('instanceID', 'pred').toPandas(),
'submission.gbdt.csv',
index=False)
def gbdt(data, label_index, feature_indexs, project_url):
# 2.构造训练数据集
data_set = data.rdd.map(list)
(train_data,
test_data) = data_set.randomSplit([trainDataRatio, 1 - trainDataRatio])
data.show()
def func(x):
features_data = []
for feature in feature_indexs:
features_data.append(x[feature])
return Row(label=label_index, features=Vectors.dense(features_data))
training_set = train_data.map(list).map(lambda x: func(x)).toDF()
training_set.show()
train_num = training_set.count()
print("训练样本数:{}".format(train_num))
# 3.使用GBDT进行训练
string_indexer = StringIndexer(inputCol="label", outputCol="indexed")
si_model = string_indexer.fit(training_set)
tf = si_model.transform(training_set)
gbdt = GBTClassifier(labelCol="indexed",
maxIter=maxIter,
stepSize=stepSize,
maxDepth=maxDepth,
minInstancesPerNode=minInstancesPerNode,
seed=seed)
gbdt_model = gbdt.fit(tf)
print(gbdt_model.featureImportances)
# 保存模型
model_path = project_url + '/gbdt'
gbdt_model.write().overwrite().save(model_path)
# 加载模型
gbdt_model2 = GBTClassificationModel.load(model_path)
# 预测
gbdt_model2.transform(training_set).select("prediction", "label",
"features").show(5)
def run_gradient_boost(self):
'''
Method to run gradient boost on our transformed data.
Input:
-------
None
Output:
-------
Dictionary of confusion matrix scores for this particular model.
'''
# Instantiate model
gbt = GBTClassifier(labelCol="label",
featuresCol="features",
maxIter=30
)
# Train model. This also runs the indexers.
model = gbt.fit(self.trainingData)
# Make predictions.
predictions = model.transform(self.testData)
# Write type of model to filename.
with open(self.filename,'a') as f:
f.write("\n\nGradient Boost:")
# Create confusion matrix to see how well the model performed
confusion_matrix = self.create_confusion_matrix(predictions)
# Evaluate model's AUC.
auc = self.evaluator.evaluate(predictions)
print("AUC Score: ",str(auc))
# Write result of model to filename.
with open(self.filename,'a') as f:
f.write("\nAUC Score: " + str(auc))
return confusion_matrix
def gbtModel(self, dfTrain, dfTest, col):
client = mlflow.tracking.MlflowClient()
mlflow.set_experiment("gML GBT")
mlflow.end_run()
mlflow.start_run()
result = list()
result.append("gbt")
result.append(col)
gbt = GBTClassifier(
labelCol="label",
featuresCol="features",
predictionCol='prediction',
maxDepth=5,
maxBins=32,
minInstancesPerNode=1,
minInfoGain=0.0,
maxMemoryInMB=256,
cacheNodeIds=False,
checkpointInterval=10,
lossType='logistic',
maxIter=20,
stepSize=0.1,
seed=None,
subsamplingRate=1.0,
featureSubsetStrategy='all',
)
model = gbt.fit(dfTrain)
predictions = model.transform(dfTest)
metrics = ["accuracy", "f1"]
for metric in metrics:
evaluator = MulticlassClassificationEvaluator(
labelCol="label",
predictionCol="prediction",
metricName=metric)
v = evaluator.evaluate(predictions)
mlflow.log_metric(metric, v)
temp = [metric, v]
result.append(temp)
mlflow.spark.log_model(model, "gbtModel")
return result
# COMMAND ----------
# MAGIC %md
# MAGIC ####<span style="color:darkblue">Question 3</span>
# MAGIC 1. Train a GBTClassifier on the training data, call the trained model 'gbModel'
# COMMAND ----------
### Question 3.1 Answer ###
from pyspark.ml.classification import GBTClassifier
# Create initial LogisticRegression model
gb = GBTClassifier(labelCol="label", featuresCol="features", maxIter=10)
# Train model with Training Data
gbModel = gb.fit(trainingData)
# COMMAND ----------
# MAGIC %md
# MAGIC
# MAGIC ####Logistic Regression - Predict
# COMMAND ----------
# make predictions on test data
lrPredictions = lrModel.transform(testData)
# display predictions
display(lrPredictions.select("label", "prediction", "probability"))
#display(lrPredictions)
evaluator = BinaryClassificationEvaluator(labelCol="is_duplicate")
AUCrf = evaluator.evaluate(RFpredictions)
print("Random Forest AUC = %g" % AUCrf)
#Feature importance code
RFimp = pd.Series(RFmodel.featureImportances.toArray(), index=featureNames)
print(RFimp.sort_values(ascending=False))
# ## Gradient-boosted trees
# Fit GBT model and make predictions.
#iterations is main hyperparam (30 is max), eta doesn't change in Y code
gbt = GBTClassifier(labelCol="is_duplicate",
maxIter=40,
stepSize=0.05,
maxDepth=4)
gbtModel = gbt.fit(trainingData)
# Make predictions
gbtPredictions = gbtModel.transform(testData)
# Calculate AUC
# Select (prediction, true label) and compute test error
evaluator = BinaryClassificationEvaluator(labelCol="is_duplicate")
AUCgbt = evaluator.evaluate(gbtPredictions)
print("Gradient Boosted Trees AUC = %g" % AUCgbt)
# Analyze importance of features.
#Feature importance code
GBTimp = pd.Series(gbtModel.featureImportances.toArray(), index=featureNames)
print(GBTimp.sort_values(ascending=False))
features=[]
try:
fe = r[1:-1]
for i in range(len(fe)):
features.append(float(abs(hash("VAR_"+'{0:04}'.format(i)+fe[i])))%D)
target = float(r[-1])
ID=float(r[0])
return target, Vectors.dense(features)
except:
return (0.0,[0.0]*1932)
new_rdd = rdd.filter(lambda i : len(i)==1934)
rdd_after_trans = new_rdd.map(helper1)
rdd_after_trans.cache()
df = sqlContext.createDataFrame(rdd_after_trans,["label", "features"])
(trainingData, testData) = rdd_pca1.randomSplit([0.7, 0.3])
stringIndexer = StringIndexer(inputCol="label", outputCol="indexed")
si_model = stringIndexer.fit(trainingData)
td = si_model.transform(trainingData)
gbt = GBTClassifier(maxIter=100, maxDepth=10, labelCol="label")
model = gbt.fit(trainingData)
result = model.transform(testData).rdd.map(lambda r: str(r.label)+','+str(r.probability[0]))
result.saveAsTextFile("/user/demo/gbt_100_20")
df1 = sqlContext.createDataFrame([
Row(label=0.0, features=Vectors.dense([0.0, 0.0])),
Row(label=0.0, features=Vectors.dense([0.0, 1.0])),
Row(label=1.0, features=Vectors.dense([1.0, 0.0]))])
output = assembler.transform(df)
indexer = StringIndexer(inputCol='Private', outputCol='PrivateIndex')
output_fixed = indexer.fit(output).transform(output)
# output_fixed.printSchema()
final_data = output_fixed.select(['features', 'PrivateIndex'])
train_data, test_data = final_data.randomSplit([0.7, 0.3])
dtc = DecisionTreeClassifier(labelCol='PrivateIndex', featuresCol='features')
rfc = RandomForestClassifier(labelCol='PrivateIndex', featuresCol='features')
gbt = GBTClassifier(labelCol='PrivateIndex', featuresCol='features')
dtc_model = dtc.fit(train_data)
rfc_model = rfc.fit(train_data)
gbt_model = gbt.fit(train_data)
dtc_preds = dtc_model.transform(test_data)
rfc_preds = rfc_model.transform(test_data)
gbt_preds = gbt_model.transform(test_data)
my_binary_eval = BinaryClassificationEvaluator(labelCol='PrivateIndex')
print("DTC")
print(my_binary_eval.evaluate(dtc_preds))
print("RFC")
print(my_binary_eval.evaluate(rfc_preds))
# gbt only has a prediction column
gbt_eval = BinaryClassificationEvaluator(labelCol='PrivateIndex',
rawPredictionCol='prediction')
spark = SparkSession.builder.appName('mytree').getOrCreate()
sample_test_data_path = 'test_input/trees/sample_libsvm_data.txt'
data = spark.read.format('libsvm').load(sample_test_data_path)
train_data, test_data = data.randomSplit([0.7, 0.3])
dtc = DecisionTreeClassifier()
rfc = RandomForestClassifier(numTrees=100)
gbtc = GBTClassifier()
dtc_model = dtc.fit(train_data)
rfc_model = rfc.fit(train_data)
gbtc_model = gbtc.fit(train_data)
dtc_preds = dtc_model.transform(test_data)
rfc_preds = rfc_model.transform(test_data)
gbtc_preds = gbtc_model.transform(test_data)
acc_eval = MulticlassClassificationEvaluator(metricName='accuracy')
print 'DTC Accuracy:'
acc_eval.evaluate(dtc_preds)
print 'RFC Accuracy:'
acc_eval.evaluate(rfc_preds)
print 'GBTC Accuracy:'
acc_eval.evaluate(gbtc_preds)
