Rename

class nvtabular.ops.Rename(f=None, postfix=None, name=None)

Bases: nvtabular.ops.operator.Operator

This operation renames columns by one of several methods:

• using a user defined lambda function to transform column names

• appending a postfix string to every column name

• renaming a single column to a single fixed string

Example usage:

# Rename columns after LogOp
cont_features = cont_names >> nvt.ops.LogOp() >> Rename(postfix='_log')
processor = nvt.Workflow(cont_features)

Parameters

• f (callable, optional) – Function that takes a column name and returns a new column name

• postfix (str, optional) – If set each column name in the output will have this string appended to it

• name (str, optional) – If set, a single input column will be renamed to this string

transform(col_selector: nvtabular.columns.selector.ColumnSelector, df: pandas.core.frame.DataFrame) → pandas.core.frame.DataFrame

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

compute_output_schema(input_schema: nvtabular.columns.schema.Schema, col_selector: nvtabular.columns.selector.ColumnSelector) → nvtabular.columns.schema.Schema

output_column_names(col_selector)