class_docstr: Defines the input data for the operator DAG.
  
  For example, this may hold cached blocks from a previous Dataset execution, or
  the arguments for read tasks.
code: def get_stats(self) -> StatsDict:
      return {}
  
file_path: ray/python/ray/data/_internal/execution/operators/input_data_buffer.py
imports: from typing import Callable, List, Optional
  from ray.data._internal.execution.interfaces import ExecutionOptions, PhysicalOperator, RefBundle
  from ray.data._internal.stats import StatsDict
label_desc: Use image node_id 7 for calling the InputDataBuffer obj's underlying member method code with example usage: obj.get_stats() and returns: dict