# RowToRowTransformerBase Class

## Definition

Base class for transformer which produce new columns, but doesn't affect existing ones.

public abstract class RowToRowTransformerBase : Microsoft.ML.ITransformer
type RowToRowTransformerBase = class
interface ITransformer
interface ICanSaveModel
Public MustInherit Class RowToRowTransformerBase
Implements ITransformer
Inheritance
RowToRowTransformerBase
Derived
Implements

## Extension Methods

 Preview an effect of the transformer on a given data. Create a new transformer chain, by appending another transformer to the end of this transformer chain. TimeSeriesPredictionEngine creates a prediction engine for a time series pipeline. It updates the state of time series model with observations seen at prediction phase and allows checkpointing the model.