class_docstr: A rows-to-rows MapTransformFn.
class_docstr_tok: ["A","rows-to-rows","MapTransformFn","."]
code: def __init__(self, row_fn: MapTransformCallable[Row, Row]):
      self._row_fn = row_fn
      super().__init__(
          MapTransformFnDataType.Row,
          MapTransformFnDataType.Row,
      )
  
imports: import itertools
  from abc import abstractmethod
  from enum import Enum
  from typing import Any, Callable, Dict, Iterable, List, Optional, TypeVar, Union
  from ray.data._internal.block_batching.block_batching import batch_blocks
  from ray.data._internal.execution.interfaces.task_context import TaskContext
  from ray.data._internal.output_buffer import BlockOutputBuffer
  from ray.data.block import Block, BlockAccessor, DataBatch
label_desc: Use image node_id 1 to create a new RowMapTransformFn object from inherited base classes: MapTransformFn with example: obj = RowMapTransformFn(row_fn)