LambdaTransform

class LambdaTransform(in_column: str, transform_func: Callable[[pandas.core.frame.DataFrame], pandas.core.frame.DataFrame], inplace: bool = True, out_column: Optional[str] = None, inverse_transform_func: Optional[Callable[[pandas.core.frame.DataFrame], pandas.core.frame.DataFrame]] = None)

Bases: etna.transforms.base.ReversibleTransform

LambdaTransform applies input function for given series.

Init LambdaTransform.

Parameters

• in_column (str) – column to apply transform

• out_column (Optional[str]) – name of added column. If not given, use self.__repr__()

• transform_func (Callable[[pandas.core.frame.DataFrame], pandas.core.frame.DataFrame]) – function to transform data

• inverse_transform_func (Optional[Callable[[pandas.core.frame.DataFrame], pandas.core.frame.DataFrame]]) – inverse function of transform_func

• inplace (bool) –

  • if True, apply transformation inplace to in_column,

  • if False, add column and apply transformation to out_column

Warning

throws if inplace=True and out_column is initialized, transformation will be applied inplace

Raises

Value error: – if inplace=True and inverse_transform_func is not defined

Inherited-members

Parameters

• in_column (str) –

• transform_func (Callable[[pandas.core.frame.DataFrame], pandas.core.frame.DataFrame]) –

• inplace (bool) –

• out_column (Optional[str]) –

• inverse_transform_func (Optional[Callable[[pandas.core.frame.DataFrame], pandas.core.frame.DataFrame]]) –

Methods

fit(ts)	Fit the transform.
fit_transform(ts)	Fit and transform TSDataset.
get_regressors_info()	Return the list with regressors created by the transform.
inverse_transform(ts)	Inverse transform TSDataset.
load(path)	Load an object.
params_to_tune()	Get grid for tuning hyperparameters.
save(path)	Save the object.
set_params(**params)	Return new object instance with modified parameters.
to_dict()	Collect all information about etna object in dict.
transform(ts)	Transform TSDataset inplace.

fit(ts: etna.datasets.tsdataset.TSDataset) → etna.transforms.math.apply_lambda.LambdaTransform

Fit the transform.

Parameters

ts (etna.datasets.tsdataset.TSDataset) –

Return type

etna.transforms.math.apply_lambda.LambdaTransform

get_regressors_info() → List[str]

Return the list with regressors created by the transform.

Return type

List[str]