我正在使用 mlr 框架做一些事情，导致FeatureImp为每个功能返回 1，但我无法将手指放在上面。下面是一个示例：
library(caret)
#> Carregando pacotes exigidos: lattice
#> Carregando pacotes exigidos: ggplot2
library(mlr)
#> Carregando pacotes exigidos: ParamHelpers
#>
#> Attaching package: 'mlr'
#> The following object is masked from 'package:caret':
#>
#> train
library(iml)
data("iris")
iris = iris[iris$Species != 'setosa',]
iris$Species = ifelse(iris$Species == 'virginica', 1, 0)
iris$Species = as.factor(iris$Species)
ind=createDataPartition(iris$Species, times=1, p=0.8, list=FALSE)
train=iris[ind,]
test=iris[-ind,]
remove(ind)
train.task=makeClassifTask(data=train, target = 'Species', positive = 1)
test.task=makeClassifTask(data=test, target = 'Species', positive = 1)
learner=list(
xgboost = makeLearner("classif.xgboost",predict.type = "prob"),
ksvm = makeLearner("classif.ksvm",predict.type = "prob"),
nnet = makeLearner("classif.nnet",predict.type = "prob"),
randomForest = makeLearner("classif.randomForest",predict.type = "prob")
)
model = lapply(learner, function(x) train(x, train.task))
#> # weights: 19
#> initial value 57.506055
#> iter 10 value 52.109027
#> iter 20 value 7.798098
#> iter 30 value 5.401193
#> iter 40 value 4.707935
#> iter 50 value 4.702049
#> final value 4.701710
#> converged
prediction = lapply(model, function(x) predict(x, test.task))
ensemble = makeStackedLearner(learner, super.learner = 'classif.randomForest', predict.type = 'prob',
method = "stack.cv", use.feat = FALSE)
model$ensemble = train(ensemble, train.task)
#> # weights: 19
#> initial value 43.712841
#> iter 10 value 5.444287
#> iter 20 value 4.536990
#> iter 30 value 4.527489
#> iter 40 value 4.481401
#> iter 50 value 4.481221
#> iter 50 value 4.481221
#> iter 50 value 4.481221
#> final value 4.481221
#> converged
#> # weights: 19
#> initial value 52.864011
#> iter 10 value 33.347827
#> iter 20 value 2.926847
#> iter 30 value 0.011104
#> final value 0.000055
#> converged
#> # weights: 19
#> initial value 44.627604
#> iter 10 value 31.360597
#> iter 20 value 5.798769
#> iter 30 value 4.290623
#> iter 40 value 3.751202
#> iter 50 value 3.547856
#> iter 60 value 3.469366
#> iter 70 value 3.373487
#> iter 80 value 3.317680
#> iter 90 value 3.310354
#> iter 100 value 3.301115
#> final value 3.301115
#> stopped after 100 iterations
#> # weights: 19
#> initial value 46.410266
#> iter 10 value 29.975896
#> iter 20 value 1.266423
#> iter 30 value 0.004667
#> final value 0.000052
#> converged
#> # weights: 19
#> initial value 52.665930
#> final value 44.361399
#> converged
#> # weights: 19
#> initial value 60.471973
#> iter 10 value 50.475349
#> iter 20 value 7.580138
#> iter 30 value 4.828646
#> iter 40 value 4.543112
#> iter 50 value 2.995374
#> iter 60 value 2.636710
#> iter 70 value 2.539857
#> iter 80 value 2.497281
#> iter 90 value 2.427158
#> iter 100 value 2.370383
#> final value 2.370383
#> stopped after 100 iterations
prediction$ensemble = predict(model$ensemble, test.task)
predictor = Predictor$new(model$ensemble,
data = train.task$env$data[which(names(train.task$env$data) != "Species")],
y = as.numeric(train.task$env$data$Species)-1)
imp = FeatureImp$new(predictor, loss = "ce")
imp$results
#> feature importance.05 importance importance.95 permutation.error
#> 1 Sepal.Length 1 1 1 1
#> 2 Sepal.Width 1 1 1 1
#> 3 Petal.Length 1 1 1 1
#> 4 Petal.Width 1 1 1 1
创建于 2020-01-23 由 reprex 软件包 (v0.3.0(
似乎这已通过 {iml} 的开发版本修复。
我可以使用当前的 CRAN 版本重现您的问题。
library(caret)
#> Loading required package: lattice
#> Loading required package: ggplot2
library(mlr)
#> Loading required package: ParamHelpers
#> 'mlr' is in maintenance mode since July 2019. Future development
#> efforts will go into its successor 'mlr3' (<https://mlr3.mlr-org.com>).
#>
#> Attaching package: 'mlr'
#> The following object is masked from 'package:caret':
#>
#> train
library(iml)
data("iris")
iris = iris[iris$Species != "setosa", ]
iris$Species = ifelse(iris$Species == "virginica", 1, 0)
iris$Species = as.factor(iris$Species)
ind = createDataPartition(iris$Species, times = 1, p = 0.8, list = FALSE)
train = iris[ind, ]
test = iris[-ind, ]
remove(ind)
train.task = makeClassifTask(data = train, target = "Species", positive = 1)
test.task = makeClassifTask(data = test, target = "Species", positive = 1)
learner = list(
xgboost = makeLearner("classif.xgboost", predict.type = "prob"),
ksvm = makeLearner("classif.ksvm", predict.type = "prob"),
nnet = makeLearner("classif.nnet", predict.type = "prob"),
randomForest = makeLearner("classif.randomForest", predict.type = "prob")
)
model = lapply(learner, function(x) train(x, train.task))
#> # weights: 19
#> initial value 59.040647
#> iter 10 value 54.908003
#> iter 20 value 8.784817
#> iter 30 value 2.906017
#> iter 40 value 0.187334
#> iter 50 value 0.000610
#> final value 0.000059
#> converged
prediction = lapply(model, function(x) predict(x, test.task))
ensemble = makeStackedLearner(learner,
super.learner = "classif.randomForest", predict.type = "prob",
method = "stack.cv", use.feat = FALSE)
model$ensemble = train(ensemble, train.task)
#> # weights: 19
#> initial value 44.537254
#> iter 10 value 6.716784
#> iter 20 value 4.750452
#> iter 30 value 4.487501
#> iter 40 value 4.481250
#> final value 4.481222
#> converged
#> # weights: 19
#> initial value 54.135701
#> iter 10 value 13.081961
#> iter 20 value 1.676063
#> iter 30 value 0.002261
#> final value 0.000044
#> converged
#> # weights: 19
#> initial value 42.621635
#> iter 10 value 5.201573
#> iter 20 value 2.878946
#> iter 30 value 1.133911
#> iter 40 value 0.002784
#> iter 50 value 0.000726
#> final value 0.000037
#> converged
#> # weights: 19
#> initial value 43.795663
#> iter 10 value 4.478310
#> iter 20 value 1.811306
#> iter 30 value 0.027775
#> iter 40 value 0.004873
#> iter 50 value 0.001480
#> iter 60 value 0.000230
#> iter 70 value 0.000221
#> final value 0.000089
#> converged
#> # weights: 19
#> initial value 44.433321
#> iter 10 value 7.252874
#> iter 20 value 1.200457
#> iter 30 value 0.001668
#> final value 0.000063
#> converged
#> # weights: 19
#> initial value 67.012204
#> final value 55.451774
#> converged
prediction$ensemble = predict(model$ensemble, test.task)
predictor = Predictor$new(model$ensemble,
data = train.task$env$data[which(names(train.task$env$data) != "Species")],
y = as.numeric(train.task$env$data$Species) - 1)
imp = FeatureImp$new(predictor, loss = "ce")
imp$results
#> feature importance.05 importance importance.95 permutation.error
#> 1 Petal.Width 11.1 12.0 14.2 0.3000
#> 2 Petal.Length 10.3 11.5 13.1 0.2875
#> 3 Sepal.Length 3.3 4.5 6.3 0.1125
#> 4 Sepal.Width 2.1 3.5 4.0 0.0875
创建于 2020-01-23 由 reprex 软件包 (v0.3.0(
会话信息
devtools::session_info()
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