当我在使用 mlr3pipeline 编码和缩放我的数据集后运行以下代码以在 mlr3proba 中训练模型时:
task =tsk("sonar")
learner = lrn("classif.rpart")
measure = msr("classif.ce")
inner.rsmp <- rsm("cv", folds = 5)
train_set = sample(task$nrow, 0.8 * task$nrow)
test_set = setdiff(seq_len(task$nrow), train_set)
learner <- po("encode") %>>% po("scale") %>>% po("learner", learner)
learner$train(task, row_ids = train_set)
R代码显示错误如下:
Error in learner$train(task, row_ids = train_set) :
unused argument (row_ids = train_set)
我在另一个数据集中尝试了这个,但它显示了同样的问题。
但如果我不对数据集进行编码和缩放,一切正常。
此外,对于resample()
功能,它是可以的(尽管编码和缩放):
rr <- resample(task, learner, inner.rsmp)
rr$aggregate(measure)
#Results:
INFO [08:46:55.411] [mlr3] Applying learner 'encode.scale.classif.rpart' on task 'sonar' (iter 4/5)
INFO [08:46:55.539] [mlr3] Applying learner 'encode.scale.classif.rpart' on task 'sonar' (iter 1/5)
INFO [08:46:55.644] [mlr3] Applying learner 'encode.scale.classif.rpart' on task 'sonar' (iter 2/5)
INFO [08:46:55.773] [mlr3] Applying learner 'encode.scale.classif.rpart' on task 'sonar' (iter 5/5)
INFO [08:46:55.876] [mlr3] Applying learner 'encode.scale.classif.rpart' on task 'sonar' (iter 3/5)
rr$score(measure)
task task_id learner learner_id resampling
1: <TaskClassif[46]> sonar <GraphLearner[33]> encode.scale.classif.rpart <ResamplingCV[19]>
2: <TaskClassif[46]> sonar <GraphLearner[33]> encode.scale.classif.rpart <ResamplingCV[19]>
3: <TaskClassif[46]> sonar <GraphLearner[33]> encode.scale.classif.rpart <ResamplingCV[19]>
4: <TaskClassif[46]> sonar <GraphLearner[33]> encode.scale.classif.rpart <ResamplingCV[19]>
5: <TaskClassif[46]> sonar <GraphLearner[33]> encode.scale.classif.rpart <ResamplingCV[19]>
resampling_id iteration prediction classif.ce
1: cv 1 <PredictionClassif[19]> 0.3333333
2: cv 2 <PredictionClassif[19]> 0.2142857
3: cv 3 <PredictionClassif[19]> 0.2380952
4: cv 4 <PredictionClassif[19]> 0.3658537
5: cv 5 <PredictionClassif[19]> 0.2439024
那么问题出在哪里?