ft_string_indexer
From sparklyr v0.2.27
by Javier Luraschi
Feature Transformation -- StringIndexer
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.
Usage
ft_string_indexer(x, input_col = NULL, output_col = NULL, params = NULL)Arguments
- x
- An object (usually a
spark_tbl) coercable to a Spark DataFrame. - 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
labelskey.
See Also
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_discrete_cosine_transform,
ft_elementwise_product,
ft_index_to_string,
ft_one_hot_encoder,
ft_quantile_discretizer,
ft_sql_transformer,
ft_vector_assembler,
sdf_mutate
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