Github user mengxr commented on a diff in the pull request:
https://github.com/apache/spark/pull/14384#discussion_r75181798
--- Diff: R/pkg/inst/tests/testthat/test_mllib.R ---
@@ -454,4 +454,61 @@ test_that("spark.survreg", {
}
})
+test_that("spark.als", {
+ # R code to reproduce the result.
+ #
+ #' data <- list(list(0, 0, 4.0), list(0, 1, 2.0), list(1, 1, 3.0),
list(1, 2, 4.0),
+ #' list(2, 1, 1.0), list(2, 2, 5.0))
+ #' df <- createDataFrame(data, c("user", "item", "rating"))
+ #' model <- spark.als(df, ratingCol = "rating", userCol = "user",
itemCol = "item",
+ #' rank = 10, maxIter = 5, seed = 0)
+ #' test <- createDataFrame(list(list(0, 2), list(1, 0), list(2, 0)),
c("user", "item"))
+ #' predict(model, test)
+ #
+ # -- output of 'predict(model, data)'
+ #
+ # user item prediction
+ # 0 2 -0.1380762
+ # 1 0 2.6258414
+ # 2 0 -1.5018409
--- End diff --
It is not helpful if the code to produce the expect answer is the same as
the test code. We can either use Scala code or simply remove this block of
comments.
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