Pybrain kullanarak sinir ağı oluşturma üzerinde çalışıyorum ve bir nedenle yayılmayla antrenman yaptıktan sonra ağımı eğitemedim. Çıktı boyutunda ikiden fazla sınıfla kullandığım herhangi bir veri kümesi tüm gözlemlerimi bir kategoride toplayacaktır. Bunun neden olduğunu bilen var mı? Kod ve bazı çıktılar aşağıda.Pybrain Neural Network doğru antrenman yapmadı
Training Epoch #19
Total error: 0.0968444196605
Ve karışıklık matrisi, hassasiyet, ve hatırlamayı yazdırmak için gittiğinizde henüz alıyorum: Aşağıdaki çıktıda görüldüğü gibi
import scipy
import numpy
from pybrain.datasets import ClassificationDataSet
from pybrain.utilities import percentError
from pybrain.tools.shortcuts import buildNetwork
from pybrain.supervised.trainers import BackpropTrainer
from pybrain.structure.modules import SoftmaxLayer
from sklearn.metrics import precision_score,recall_score,confusion_matrix
def makeDataset(CSVfile,ClassFile):
#import the features to data, and their classes to dataClasses
data=numpy.genfromtxt(CSVfile,delimiter=",")
classes=numpy.genfromtxt(ClassFile,delimiter=",")
print("Building the dataset from CSV files")
#Initialize an empty Pybrain dataset, and populate it
alldata=ClassificationDataSet(len(data[0]),1,nb_classes=3)
for count in range(len((classes))):
alldata.addSample(data[count],[classes[count]])
return alldata
def makeNeuralNet(alldata,trainingPercent=.3,hiddenNeurons=5,trainingIterations=20):
#Divide the data set into training and non-training data
testData, trainData = alldata.splitWithProportion(trainingPercent)
testData._convertToOneOfMany()
trainData._convertToOneOfMany()
#Then build the network, and using backwards propogation to train it
network = buildNetwork(trainData.indim, hiddenNeurons, trainData.outdim, outclass=SoftmaxLayer)
trainer = BackpropTrainer(network, dataset=trainData, momentum=0.1, verbose=True, weightdecay=0.01)
for i in range(trainingIterations):
print("Training Epoch #"+str(i))
trainer.trainEpochs(1)
return [network,trainer]
def checkNeuralNet(trainer,alldata):
predictedVals=trainer.testOnClassData(alldata)
actualVals=list(alldata['target'])
## for row in alldata['target']:
## row=list(row)
## index=row.index(1)
## actualVals+=[index]
print("-----------------------------")
print("-----------------------------")
print("The precision is "+str(precision_score(actualVals,predictedVals)))
print("The recall is "+str(recall_score(actualVals,predictedVals)))
print("The confusion matrix is as shown below:")
print(confusion_matrix(actualVals,predictedVals))
CSVfile="/home/ubuntu/test.csv"
ClassFile="/home/ubuntu/test_Classes.csv"
#Build our dataset
alldata=makeDataset(CSVfile,ClassFile)
#Build and train the network
net=makeNeuralNet(alldata,trainingPercent=.7,hiddenNeurons=20,trainingIterations=20)
network=net[0]
trainer=net[1]
#Check it's strength
checkNeuralNet(trainer,alldata)
eğitimin son dönemi, 0,09 hata var Bu tuhaf hata yanı sıra aşağıdaki:
UserWarning: The sum of true positives and false positives are equal to zero for some labels. Precision is ill defined for those labels [1 2]. The precision and recall are equal to zero for some labels. fbeta_score is ill defined for those labels [1 2].
average=average)
The precision is 0.316635552252
UserWarning: The sum of true positives and false positives are equal to zero for some labels. Precision is ill defined for those labels [1 2]. The precision and recall are equal to zero for some labels. fbeta_score is ill defined for those labels [1 2].
average=average)
The recall is 0.562703787309
The confusion matrix is as shown below:
[[4487 0 0]
[ 987 0 0]
[2500 0 0]]