predict.nnet(nnet)
predict.nnet()所属R语言包:nnet
Predict New Examples by a Trained Neural Net
由受过训练的神经网络预测新的例子
译者:生物统计家园网 机器人LoveR
描述----------Description----------
Predict new examples by a trained neural net.
由受过训练的神经网络预测新的例子。
用法----------Usage----------
## S3 method for class 'nnet'
predict(object, newdata, type = c("raw","class"), ...)
参数----------Arguments----------
参数:object
an object of class nnet as returned by nnet.
类对象nnet返回nnet的。
参数:newdata
matrix or data frame of test examples. A vector is considered to be a row vector comprising a single case.
矩阵或数据框的测试例子。一个向量被认为是一个行向量组成一情况例。
参数:type
Type of output
输出类型
参数:...
arguments passed to or from other methods. </table>
参数传递或其他方法。 </ TABLE>
Details
详情----------Details----------
This function is a method for the generic function predict() for class "nnet". It can be invoked by calling predict(x) for an object x of the appropriate class, or directly by calling predict.nnet(x) regardless of the class of the object.
这个函数是一个泛型函数predict()类"nnet"方法。它可以通过调用调用predict(x)对象x适当的类,或直接致电predict.nnet(x)不管对象的类。
值----------Value----------
If type = "raw", the matrix of values returned by the trained network; if type = "class", the corresponding class (which is probably only useful if the net was generated by nnet.formula).
如果type = "raw",如果返回值由训练有素的网络矩阵;type = "class",对应的类(这可能是唯一有用的,如果净生成nnet.formula)。
参考文献----------References----------
Pattern Recognition and Neural Networks. Cambridge.
Modern Applied Statistics with S. Fourth edition. Springer.
参见----------See Also----------
nnet, which.is.max
nnet,which.is.max
举例----------Examples----------
# use half the iris data[使用一半的虹膜数据]
ir <- rbind(iris3[,,1], iris3[,,2], iris3[,,3])
targets <- class.ind( c(rep("s", 50), rep("c", 50), rep("v", 50)) )
samp <- c(sample(1:50,25), sample(51:100,25), sample(101:150,25))
ir1 <- nnet(ir[samp,], targets[samp,],size = 2, rang = 0.1,
decay = 5e-4, maxit = 200)
test.cl <- function(true, pred){
true <- max.col(true)
cres <- max.col(pred)
table(true, cres)
}
test.cl(targets[-samp,], predict(ir1, ir[-samp,]))
# or[或]
ird <- data.frame(rbind(iris3[,,1], iris3[,,2], iris3[,,3]),
species=factor(c(rep("s",50), rep("c", 50), rep("v", 50))))
ir.nn2 <- nnet(species ~ ., data = ird, subset = samp, size = 2, rang = 0.1,
decay = 5e-4, maxit = 200)
table(ird$species[-samp], predict(ir.nn2, ird[-samp,], type = "class"))
转载请注明:出自 生物统计家园网(http://www.biostatistic.net)。
注:
注1:为了方便大家学习,本文档为生物统计家园网机器人LoveR翻译而成,仅供个人R语言学习参考使用,生物统计家园保留版权。
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