Feature Transformation -- VectorSlicer (Transformer)

Takes a feature vector and outputs a new feature vector with a subarray of the original features.

ft_vector_slicer(x, input_col = NULL, output_col = NULL,
  indices = NULL, uid = random_string("vector_slicer_"), ...)



A spark_connection, ml_pipeline, or a tbl_spark.


The name of the input column.


The name of the output column.


An vector of indices to select features from a vector column. Note that the indices are 0-based.


A character string used to uniquely identify the feature transformer.


Optional arguments; currently unused.


The object returned depends on the class of x.

  • spark_connection: When x is a spark_connection, the function returns a ml_transformer, a ml_estimator, or one of their subclasses. The object contains a pointer to a Spark Transformer or Estimator object and can be used to compose Pipeline objects.

  • ml_pipeline: When x is a ml_pipeline, the function returns a ml_pipeline with the transformer or estimator appended to the pipeline.

  • tbl_spark: When x is a tbl_spark, a transformer is constructed then immediately applied to the input tbl_spark, returning a tbl_spark

See also