Github user felixcheung commented on a diff in the pull request: https://github.com/apache/spark/pull/14384#discussion_r74674616 --- Diff: R/pkg/R/mllib.R --- @@ -632,3 +642,159 @@ setMethod("predict", signature(object = "AFTSurvivalRegressionModel"), function(object, newData) { return(dataFrame(callJMethod(object@jobj, "transform", newData@sdf))) }) + + +#' Alternating Least Squares (ALS) for Collaborative Filtering +#' +#' \code{spark.als} learns latent factors in collaborative filtering via alternating least +#' squares. Users can call \code{summary} to obtain fitted latent factors, \code{predict} +#' to make predictions on new data, and \code{write.ml}/\code{read.ml} to save/load fitted models. +#' +#' For more details, see +#' \href{http://spark.apache.org/docs/latest/ml-collaborative-filtering.html}{MLlib: +#' Collaborative Filtering}. +#' Additional arguments can be passed to the methods. +#' \describe{ +#' \item{nonnegative}{logical value indicating whether to apply nonnegativity constraints. +#' Default: FALSE} +#' \item{implicitPrefs}{logical value indicating whether to use implicit preference. +#' Default: FALSE} +#' \item{alpha}{alpha parameter in the implicit preference formulation (>= 0). Default: 1.0} +#' \item{seed}{integer seed for random number generation. Default: 0} +#' \item{numUserBlocks}{number of user blocks used to parallelize computation (> 0). +#' Default: 10} +#' \item{numItemBlocks}{number of item blocks used to parallelize computation (> 0). +#' Default: 10} +#' \item{checkpointInterval}{number of checkpoint intervals (>= 1) or disable checkpoint (-1). +#' Default: 10} --- End diff -- I see. I think it's ok though. R ALS has 16 parameters - https://cran.r-project.org/web/packages/ALS/ALS.pdf Since most parameters have default values people would just omit them. I think it is better to be explicit because otherwise it is easier to make mistakes on types (eg. c() vs list()), typos and so on.
--- If your project is set up for it, you can reply to this email and have your reply appear on GitHub as well. If your project does not have this feature enabled and wishes so, or if the feature is enabled but not working, please contact infrastructure at infrastruct...@apache.org or file a JIRA ticket with INFRA. --- --------------------------------------------------------------------- To unsubscribe, e-mail: reviews-unsubscr...@spark.apache.org For additional commands, e-mail: reviews-h...@spark.apache.org