我需要查看clusterCenters中来自Spark Scala管道的K均值，但是
value clusterCenters不是org.apache.spark.ml.PipelineModel的成员。
代码：
scala> val pipeline = new Pipeline().setStages(Array(kmeans))
pipeline: org.apache.spark.ml.Pipeline = pipeline_805e99765da8
scala> val model = pipeline.fit(dataset)
model: org.apache.spark.ml.PipelineModel = pipeline_805e99765da8
scala> model.clusterCenters.foreach(println)
<console>:70: error: value clusterCenters is not a member of org.apache.spark.ml.PipelineModel
model.clusterCenters.foreach(println)
^