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[SPARKR][MINOR] Fix LDA doc

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## What changes were proposed in this pull request?

This PR tries to fix the name of the `SparkDataFrame` used in the example. Also, it gives a reference url of an example data file so that users can play with.

## How was this patch tested?

Manual test.

Author: Junyang Qian <junyangq@databricks.com>

Closes #14853 from junyangq/SPARKR-FixLDADoc.
This commit is contained in:
Junyang Qian 2016-08-29 10:23:10 -07:00 committed by Xiangrui Meng
parent 08913ce000
commit 6a0fda2c05
1 changed files with 7 additions and 3 deletions
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10
R/pkg/R/mllib.R
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@ -994,18 +994,22 @@ setMethod("spark.survreg", signature(data = "SparkDataFrame", formula = "formula
#' @export
#' @examples
#' \dontrun{
#' text <- read.df("path/to/data", source = "libsvm")
#' # nolint start
#' # An example "path/to/file" can be
#' # paste0(Sys.getenv("SPARK_HOME"), "/data/mllib/sample_lda_libsvm_data.txt")
#' # nolint end
#' text <- read.df("path/to/file", source = "libsvm")
#' model <- spark.lda(data = text, optimizer = "em")
#'
#' # get a summary of the model
#' summary(model)
#'
#' # compute posterior probabilities
#' posterior <- spark.posterior(model, df)
#' posterior <- spark.posterior(model, text)
#' showDF(posterior)
#'
#' # compute perplexity
#' perplexity <- spark.perplexity(model, df)
#' perplexity <- spark.perplexity(model, text)
#'
#' # save and load the model
#' path <- "path/to/model"