nvtabular.ops.NormalizeMinMax

class nvtabular.ops.NormalizeMinMax(out_dtype=None)[source]

Bases: nvtabular.ops.stat_operator.StatOperator

This operator standardizes continuous features such that they are between 0 and 1.

Example usage:

# Use NormalizeMinMax to define a NVTabular workflow
cont_features = CONTINUOUS_COLUMNS >> ops.NormalizeMinMax()
processor = nvtabular.Workflow(cont_features)

Parameters: out_dtype (str, default is float64) – dtype of output columns.

__init__(out_dtype=None)[source]

Methods

`__init__`([out_dtype])
`clear`()
`column_mapping`(col_selector)	Compute which output columns depend on which input columns
`compute_column_schema`(col_name, input_schema)
`compute_input_schema`(root_schema, …)	Given the schemas coming from upstream sources and a column selector for the input columns, returns a set of schemas for the input columns this operator will use
`compute_output_schema`(input_schema, col_selector)	Given a set of schemas and a column selector for the input columns, returns a set of schemas for the transformed columns this operator will produce
`compute_selector`(input_schema, selector[, …])	Provides a hook method for sub-classes to override to implement custom column selection logic.
`create_node`(selector)
`fit`(col_selector, ddf)	Calculate statistics for this operator, and return a dask future to these statistics, which will be computed by the workflow.
`fit_finalize`(dask_stats)	Finalize statistics calculation - the workflow calls this function with the computed statistics from the ‘fit’ object’
`inference_initialize`(col_selector, model_config)	Configures this operator for use in inference.
`output_column_names`(col_selector)	Given a set of columns names returns the names of the transformed columns this operator will produce
`set_storage_path`(new_path[, copy])	Certain stat operators need external storage - for instance Categorify writes out parquet files containing the categorical mapping.
`transform`(col_selector, df)	Transform the dataframe by applying this operator to the set of input columns
`validate_schemas`(parents_schema, …[, …])	Provides a hook method that sub-classes can override to implement schema validation logic.

Attributes

`dependencies`	Defines an optional list of column dependencies for this operator.
`dynamic_dtypes`
`label`
`output_dtype`
`output_properties`
`output_tags`
`supported_formats`
`supports`

transform(col_selector: merlin.dag.selector.ColumnSelector, df: pandas.core.frame.DataFrame)[source]

Transform the dataframe by applying this operator to the set of input columns

Parameters

columns (list of str or list of list of str) – The columns to apply this operator to
df (Dataframe) – A pandas or cudf dataframe that this operator will work on

Returns

Returns a transformed dataframe for this operator

Return type

DataFrame

fit(col_selector: merlin.dag.selector.ColumnSelector, ddf)[source]: Calculate statistics for this operator, and return a dask future to these statistics, which will be computed by the workflow.

fit_finalize(dask_stats)[source]: Finalize statistics calculation - the workflow calls this function with the computed statistics from the ‘fit’ object’

clear()[source]

property supports

property output_tags

property output_dtype