code: def __init__(self, n: int, num_columns: int):
      self._n = n
      self._num_columns = num_columns
  
imports: import warnings
  from typing import Any, Callable, Iterable, List, Optional
  import numpy
  import ray
  from ray.data._internal.execution.interfaces import TaskContext
  from ray.data._internal.util import _check_pyarrow_version
  from ray.data.block import Block, BlockAccessor, BlockMetadata
  from ray.data.context import DataContext
  from ray.types import ObjectRef
  from ray.util.annotations import Deprecated, DeveloperAPI, PublicAPI
label_desc: Use image node_id 1 to create a new _RandomIntRowDatasourceReader object from inherited base classes: Reader with example: obj = _RandomIntRowDatasourceReader(n, num_columns)