#' Spark NLP DistilBertForTokenClassification
#'
#' DistilBertForTokenClassification can load Bert Models with a token classification head on top
#' (a linear layer on top of the hidden-states output) e.g. for Named-Entity-Recognition (NER) tasks.
#' See \url{https://nlp.johnsnowlabs.com/docs/en/transformers#distilbertfortokenclassification}
#'
#' @template roxlate-nlp-algo
#' @template roxlate-inputs-output-params
#' @param batch_size Size of every batch (Default depends on model).
#' @param case_sensitive Whether to ignore case in index lookups (Default depends on model)
#' @param max_sentence_length Max sentence length to process (Default: 128)
#'
#' @export
nlp_distilbert_token_classification_pretrained <- function(sc, input_cols, output_col,
batch_size = NULL, case_sensitive = NULL,
max_sentence_length = NULL,
name = NULL, lang = NULL, remote_loc = NULL) {
args <- list(
input_cols = input_cols,
output_col = output_col,
batch_size = batch_size,
case_sensitive = case_sensitive,
max_sentence_length = max_sentence_length
) %>%
validator_nlp_distilbert_token_classification()
model_class <- "com.johnsnowlabs.nlp.annotators.classifier.dl.DistilBertForTokenClassification"
model <- pretrained_model(sc, model_class, name, lang, remote_loc)
spark_jobj(model) %>%
sparklyr::jobj_set_param("setInputCols", args[["input_cols"]]) %>%
sparklyr::jobj_set_param("setOutputCol", args[["output_col"]]) %>%
sparklyr::jobj_set_param("setCaseSensitive", args[["case_sensitive"]]) %>%
sparklyr::jobj_set_param("setBatchSize", args[["batch_size"]]) %>%
sparklyr::jobj_set_param("setMaxSentenceLength", args[["max_sentence_length"]])
new_ml_transformer(model)
}
#' @import forge
validator_nlp_distilbert_token_classification <- function(args) {
args[["input_cols"]] <- cast_string_list(args[["input_cols"]])
args[["output_col"]] <- cast_string(args[["output_col"]])
args[["batch_size"]] <- cast_nullable_integer(args[["batch_size"]])
args[["case_sensitive"]] <- cast_nullable_logical(args[["case_sensitive"]])
args[["max_sentence_length"]] <- cast_nullable_integer(args[["max_sentence_length"]])
args
}
new_nlp_distilbert_for_token_classification <- function(jobj) {
sparklyr::new_ml_transformer(jobj, class = "nlp_distilbert_for_token_classification")
}
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