noiris: Data sets

#' MovieLens data.
#'
#' A sample of the recent MovieLens data
#'
#' @format A data frame of 1 million rows and 27 columns regarding 184164 users
#'   and 21745 distinct movies.
#' \describe{
#'   \item{user_id}{Numeric user id}
#'   \item{movie_id}{Numeric movie id}
#'   \item{rating}{Numeric favorability rating from .5 to 5 by .5.}
#'   \item{timestamp}{Time the rating was given}
#'   \item{title}{A clean version of the title. See details.}
#'   \item{year}{The year of the title}
#'   \item{genres}{A list column whose elements are character vectors of genres applicable to the title}
#'   \item{action}{The genres as a binary indicator}
#'   \item{adventure}{The genres as a binary indicator}
#'   \item{drama}{The genres as a binary indicator}
#'   \item{scifi}{The genres as a binary indicator}
#'   \item{thriller}{The genres as a binary indicator}
#'   \item{crime}{The genres as a binary indicator}
#'   \item{romance}{The genres as a binary indicator}
#'   \item{animation}{The genres as a binary indicator}
#'   \item{children}{The genres as a binary indicator}
#'   \item{comedy}{The genres as a binary indicator}
#'   \item{fantasy}{The genres as a binary indicator}
#'   \item{imax}{The genres as a binary indicator}
#'   \item{horror}{The genres as a binary indicator}
#'   \item{western}{The genres as a binary indicator}
#'   \item{war}{The genres as a binary indicator}
#'   \item{mystery}{The genres as a binary indicator}
#'   \item{musical}{The genres as a binary indicator}
#'   \item{film_noir}{The genres as a binary indicator}
#'   \item{documentary}{The genres as a binary indicator}
#'   \item{no_genre}{The genres as a binary indicator}
#'   }
#'
#' @details This is a random sample of 1 million observations from the MovieLens data (not the 1 million data set version listed at the ),
#'   often used as a machine learning benchmark. Differences from the raw data include separation
#'   of title and year, and adding the genres as indicator variables.  See the
#'   \href{http://files.grouplens.org/datasets/movielens/ml-20m-README.html}{associated
#'   ReadMe file} for more details.
#'
#' @source \url{https://grouplens.org/datasets/movielens/}
#' @examples
#' library(noiris)
#' str(movielens)
#'
"movielens"