Github user mengxr commented on a diff in the pull request:
https://github.com/apache/spark/pull/8937#discussion_r40697270
--- Diff: mllib/src/main/scala/org/apache/spark/ml/recommendation/ALS.scala
---
@@ -315,12 +315,17 @@ class ALS(override val uid: String) extends
Estimator[ALSModel] with ALSParams {
override def fit(dataset: DataFrame): ALSModel = {
import dataset.sqlContext.implicits._
- val ratings = dataset
- .select(col($(userCol)).cast(IntegerType),
col($(itemCol)).cast(IntegerType),
- col($(ratingCol)).cast(FloatType))
- .map { row =>
- Rating(row.getInt(0), row.getInt(1), row.getFloat(2))
+ val ratings = if ($(ratingCol) != "") {
--- End diff --
It might be easier to define the rating col first:
~~~scale
val r = if ($(ratingCol) != "") col($(ratingCol)).cast(FloatType) else
lit(1.0f)
val ratings = dataset.select(..., ..., r).map { row =>
...
}
~~~
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