code: def __init__(self):
      self.metadata: np.ndarray = None
      self.memory_read: Callable[[np.uint64], np.ndarray] = None
      pass
  
file_path: ffcv/ffcv/pipeline/operation.py
imports: from abc import ABC, abstractmethod
  from typing import TYPE_CHECKING
  from typing import Callable, Optional, Tuple
  import numpy
  from .state import State
  from .allocation_query import AllocationQuery
label_desc: Use image node_id 1 to create a new Operation object from inherited base classes: ABC with example: obj = Operation()