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#' Feature Transformation -- IDF (Estimator)
#'
#' Compute the Inverse Document Frequency (IDF) given a collection of documents.
#'
#' @template roxlate-ml-feature-input-output-col
#' @template roxlate-ml-feature-transformer
#' @template roxlate-ml-feature-estimator-transformer
#' @param min_doc_freq The minimum number of documents in which a term should appear. Default: 0
#'
#' @export
ft_idf <- function(x, input_col = NULL, output_col = NULL,
min_doc_freq = 0, uid = random_string("idf_"), ...) {
check_dots_used()
UseMethod("ft_idf")
}
ml_idf <- ft_idf
#' @export
ft_idf.spark_connection <- function(x, input_col = NULL, output_col = NULL,
min_doc_freq = 0, uid = random_string("idf_"), ...) {
.args <- list(
input_col = input_col,
output_col = output_col,
min_doc_freq = min_doc_freq,
uid = uid
) %>%
c(rlang::dots_list(...)) %>%
validator_ml_idf()
estimator <- spark_pipeline_stage(
x, "org.apache.spark.ml.feature.IDF",
input_col = .args[["input_col"]], output_col = .args[["output_col"]], uid = .args[["uid"]]
) %>%
invoke("setMinDocFreq", .args[["min_doc_freq"]]) %>%
new_ml_idf()
estimator
}
#' @export
ft_idf.ml_pipeline <- function(x, input_col = NULL, output_col = NULL,
min_doc_freq = 0, uid = random_string("idf_"), ...) {
stage <- ft_idf.spark_connection(
x = spark_connection(x),
input_col = input_col,
output_col = output_col,
min_doc_freq = min_doc_freq,
uid = uid,
...
)
ml_add_stage(x, stage)
}
#' @export
ft_idf.tbl_spark <- function(x, input_col = NULL, output_col = NULL,
min_doc_freq = 0, uid = random_string("idf_"), ...) {
stage <- ft_idf.spark_connection(
x = spark_connection(x),
input_col = input_col,
output_col = output_col,
min_doc_freq = min_doc_freq,
uid = uid,
...
)
if (is_ml_transformer(stage)) {
ml_transform(stage, x)
} else {
ml_fit_and_transform(stage, x)
}
}
new_ml_idf <- function(jobj) {
new_ml_estimator(jobj, class = "ml_idf")
}
new_ml_idf_model <- function(jobj) {
new_ml_transformer(jobj, class = "ml_idf_model")
}
validator_ml_idf <- function(.args) {
.args <- validate_args_transformer(.args)
.args[["min_doc_freq"]] <- cast_scalar_integer(.args[["min_doc_freq"]])
.args
}
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