R 在这种情况下,如何制作混淆矩阵? 库(h2o) h2o.init(n读数=-1) 测试
使用函数R 在这种情况下,如何制作混淆矩阵? 库(h2o) h2o.init(n读数=-1) 测试,r,machine-learning,deep-learning,h2o,R,Machine Learning,Deep Learning,H2o,使用函数h2o.confusionMatrix()获取混淆矩阵。简单的方法是为其提供模型,以及您想要分析的数据: library(h2o) h2o.init(nthreads=-1) test <- h2o.importFile(path = "C:/Users/AkshayJ/Documents/newapril/data/testdata.csv") train <- h2o.importFile(path = "C:/Users/AkshayJ/Documents/newapr
h2o.confusionMatrix()
获取混淆矩阵。简单的方法是为其提供模型,以及您想要分析的数据:
library(h2o)
h2o.init(nthreads=-1)
test <- h2o.importFile(path = "C:/Users/AkshayJ/Documents/newapril/data/testdata.csv")
train <- h2o.importFile(path = "C:/Users/AkshayJ/Documents/newapril/data/traindata.csv")
y <- "Label"
train[,y] <- as.factor(train[,y])
test[,y] <- as.factor(test[,y])
train[,"Allele1Top"] <- as.factor(train[,"Allele1Top"])
test[,"Allele1Top"] <- as.factor(test[,"Allele1Top"])
train[,"Allele2Top"] <- as.factor(train[,"Allele2Top"])
test[,"Allele2Top"] <- as.factor(test[,"Allele2Top"])
train[,"Allele1Forward"] <- as.factor(train[,"Allele1Forward"])
test[,"Allele1Forward"] <- as.factor(test[,"Allele1Forward"])
train[,"Allele2Forward"] <- as.factor(train[,"Allele2Forward"])
test[,"Allele2Forward"] <- as.factor(test[,"Allele2Forward"])
train[,"Allele1AB"] <- as.factor(train[,"Allele1AB"])
test[,"Allele1AB"] <- as.factor(test[,"Allele1AB"])
train[,"Allele2AB"] <- as.factor(train[,"Allele2AB"])
test[,"Allele2AB"] <- as.factor(test[,"Allele2AB"])
train[,"Chr"] <- as.factor(train[,"Chr"])
test[,"Chr"] <- as.factor(test[,"Chr"])
train[,"SNP"] <- as.factor(train[,"SNP"])
test[,"SNP"] <- as.factor(test[,"SNP"])
x <- setdiff(names(train),y)
model <- h2o.deeplearning(
x = x,
y = y,
training_frame = train,
validation_frame = test,
distribution = "multinomial",
activation = "RectifierWithDropout",
hidden = c(32,32,32),
input_dropout_ratio = 0.2,
sparse = TRUE,
l1 = 1e-5,
epochs = 10)
predic <- h2o.predict(model, newdata = test)
table(pred=predic, true = test[,21])
如果查看?h2o.confusionMatrix
,您会发现它还可以接受H2OModelMetrics
对象。您可以通过调用h2o.performance()
获得其中一个:
我推荐第二种方法,因为p
对象包含关于您的模型有多好的其他有用信息
注意:无论哪种方式,您都没有使用您的预测。基本上:
如果要分析模型的质量h2o.性能
如果你想得到实际的预测h2o.predict
as.factor()
行将最小代码弄乱)。好的……记住这一点。我尝试了两种方法,但得到了相同的输出:混淆矩阵,具有相同的值、错误和阈值。为什么您更喜欢第二种方法(h2o.confusionMatrix(p)
)@因为如果我打印p
,它不仅告诉我混淆矩阵,还告诉我MSE、RMSE、Logloss、命中率等。它也是您为单个函数提供的参数,例如h2o.MSE(p)
。
h2o.confusionMatrix(model, test)
p = h2o.performance(model, test)
h2o.confusionMatrix(p)