Github user jkbradley commented on a diff in the pull request:
https://github.com/apache/spark/pull/4304#discussion_r29733206
--- Diff: mllib/src/main/scala/org/apache/spark/mllib/feature/PCA.scala ---
@@ -0,0 +1,97 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.spark.mllib.feature
+
+import org.apache.spark.api.java.JavaRDD
+import org.apache.spark.mllib.linalg._
+import org.apache.spark.mllib.linalg.distributed.RowMatrix
+import org.apache.spark.rdd.RDD
+
+/**
+ * A feature transformer that projects vectors to a low-dimensional space
using PCA.
+ *
+ * @param k number of principal components
+ */
+class PCA(val k: Int) {
+ require(k >= 1)
+
+ /**
+ * Computes a [[PCAModel]] that contains the principal components of the
input vectors.
+ *
+ * @param sources source vectors
+ */
+ def fit(sources: RDD[Vector]): PCAModel = {
+ require(k <= sources.first().size,
+ s"source vector size is ${sources.first().size} must be a great of k
that is $k")
--- End diff --
```must be a great of k that is $k``` should be ```must be greater than
k=$k```
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