ELKI中RepresentativeUncertainClustering算法配置问题求助（两个具体错误）

我刚接触ELKI，正在测试RepresentativeUncertainClustering算法，不过遇到了些问题，真心希望能得到大家的帮助。我试着用这个算法跑个demo，已经修改了meta.ExternalClustering和pwc.clustering参数，但还是跑不起来。

Issue 1 #

我尝试运行了下面的命令：

KDDCLIApplication -dbc.in "E:\\User\\Downloads\\IRIS1.csv" -algorithm clustering.uncertain.RepresentativeUncertainClustering -kmeans.k 3 -parallel.clusteroutline.straight

结果收到了如下错误：

Task is not completely configured:

Parameter 'pwc.metaclustering' The meta clustering algorithm (as configured) does not accept clustering results.
Read: kmedoids.PAM
Expected: Algorithm used to aggregate clustering results. Must be a distance-based clustering algorithm.
The parameter pwc.clustering is required.

我本来以为kmedoids.PAM是基于距离的聚类算法，不太明白为什么会报这个错，有没有大佬能帮忙解释下？

Issue 2 #

之后我修改了命令，改成这样：

KDDCLIApplication -dbc.in "E:\\User\\Downloads\\iris (1).csv" -dbc.filter typeconversions.UncertainifyFilter -uofilter.generator SimpleGaussianUncertainifier -uo.uncertainty.max3sigma 1.0 -algorithm clustering.uncertain.RepresentativeUncertainClustering -pwc.metaclustering meta.ExternalClustering -externalcluster.file "E:\\User\\Downloads\\IRIS11.xlsx" -pwc.clustering kmeans.SortMeans -kmeans.k 3

这次ELKI允许命令执行了，但任务还是失败了，错误信息如下：

Task failed
java.lang.NullPointerException: Cannot invoke "elki.clustering.ClusteringAlgorithm.autorun(elki.database.Database)" because "this.samplesAlgorithm" is null
    at elki.clustering.uncertain.RepresentativeUncertainClustering.runClusteringAlgorithm(RepresentativeUncertainClustering.java:301)
    at elki.clustering.uncertain.RepresentativeUncertainClustering.run(RepresentativeUncertainClustering.java:187)
    at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:103)
    at java.base/java.lang.reflect.Method.invoke(Method.java:580)
    at elki.Algorithm$Utils.autorun(Algorithm.java:126)
    at elki.clustering.ClusteringAlgorithm.autorun(ClusteringAlgorithm.java:51)
    at elki.clustering.ClusteringAlgorithm.autorun(ClusteringAlgorithm.java:47)
    at elki.workflow.AlgorithmStep.runAlgorithms(AlgorithmStep.java:97)
    at elki.KDDTask.run(KDDTask.java:103)
    at elki.application.KDDCLIApplication.run(KDDCLIApplication.java:58)
    at [...]

看起来是this.samplesAlgorithm为空导致的，但我不清楚具体原因，有没有人知道该怎么解决这个问题？

提前感谢大家的指导！

备注：内容来源于stack exchange，提问作者Toan