ft_min_max_scaler
Feature Tranformation -- MinMaxScaler (Estimator)
Rescale each feature individually to a common range [min, max] linearly using column summary statistics, which is also known as min-max normalization or Rescaling
Usage
ft_min_max_scaler(x, input_col, output_col, min = 0, max = 1,
dataset = NULL, uid = random_string("min_max_scaler_"), ...)
Arguments
- x
A
spark_connection
,ml_pipeline
, or atbl_spark
.- input_col
The name of the input column.
- output_col
The name of the output column.
- min
Lower bound after transformation, shared by all features Default: 0.0
- max
Upper bound after transformation, shared by all features Default: 1.0
- dataset
(Optional) A
tbl_spark
. If provided, eagerly fit the (estimator) feature "transformer" againstdataset
. See details.- uid
A character string used to uniquely identify the feature transformer.
- ...
Optional arguments; currently unused.
Details
When dataset
is provided for an estimator transformer, the function
internally calls ml_fit()
against dataset
. Hence, the methods for
spark_connection
and ml_pipeline
will then return a ml_transformer
and a ml_pipeline
with a ml_transformer
appended, respectively. When
x
is a tbl_spark
, the estimator will be fit against dataset
before
transforming x
.
When dataset
is not specified, the constructor returns a ml_estimator
, and,
in the case where x
is a tbl_spark
, the estimator fits against x
then
to obtain a transformer, which is then immediately used to transform x
.
Value
The object returned depends on the class of x
.
spark_connection
: Whenx
is aspark_connection
, the function returns aml_transformer
, aml_estimator
, or one of their subclasses. The object contains a pointer to a SparkTransformer
orEstimator
object and can be used to composePipeline
objects.ml_pipeline
: Whenx
is aml_pipeline
, the function returns aml_pipeline
with the transformer or estimator appended to the pipeline.tbl_spark
: Whenx
is atbl_spark
, a transformer is constructed then immediately applied to the inputtbl_spark
, returning atbl_spark
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 transformers: ft_binarizer
,
ft_bucketizer
,
ft_chisq_selector
,
ft_count_vectorizer
, ft_dct
,
ft_elementwise_product
,
ft_feature_hasher
,
ft_hashing_tf
, ft_idf
,
ft_imputer
,
ft_index_to_string
,
ft_interaction
, ft_lsh
,
ft_max_abs_scaler
, ft_ngram
,
ft_normalizer
,
ft_one_hot_encoder
, ft_pca
,
ft_polynomial_expansion
,
ft_quantile_discretizer
,
ft_r_formula
,
ft_regex_tokenizer
,
ft_sql_transformer
,
ft_standard_scaler
,
ft_stop_words_remover
,
ft_string_indexer
,
ft_tokenizer
,
ft_vector_assembler
,
ft_vector_indexer
,
ft_vector_slicer
, ft_word2vec