code: def _block_layout(
      self,
      blk_shape: Any,
      head_idx: int,
      query_idx: int,
      key_idx: int,
      blk_idx: int,
  ) -> np.ndarray:
      raise NotImplementedError()
  
imports: import math
  from abc import ABC, abstractmethod
  from itertools import product
  from typing import Any, Optional
  import attr
  import numpy
  import torch
label_desc: Use image node_id 3 for calling the AttentionMask obj's underlying member method code with example usage: obj._block_layout(blk_shape, head_idx, query_idx, key_idx, blk_idx) without return types