ft_string_indexer {sparklyr} | R Documentation |
Encode a column of labels into a column of label indices.
The indices are in [0, numLabels), ordered by label frequencies, with
the most frequent label assigned index 0. The transformation
can be reversed with ft_index_to_string
.
ft_string_indexer(x, input.col, output.col, params = NULL, ...)
x |
An object (usually a |
input.col |
The name of the input column(s). |
output.col |
The name of the output column. |
params |
An (optional) R environment – when available,
the index <-> label mapping generated by the string indexer
will be injected into this environment under the |
... |
Optional arguments; currently unused. |
See http://spark.apache.org/docs/latest/ml-features.html for more information on the set of transformations available for DataFrame columns in Spark.
Other feature transformation routines: ft_binarizer
,
ft_bucketizer
,
ft_count_vectorizer
,
ft_discrete_cosine_transform
,
ft_elementwise_product
,
ft_index_to_string
,
ft_one_hot_encoder
,
ft_quantile_discretizer
,
ft_regex_tokenizer
,
ft_stop_words_remover
,
ft_tokenizer
,
ft_vector_assembler
,
sdf_mutate