code: def to_dense(self) -> np.ndarray:
      return self[1:, 1:]
  
imports: import array
  from abc import ABC, abstractmethod
  from itertools import repeat
  from typing import Tuple
  import numpy
  from .window import CRWindow, Window
label_desc: Use image node_id 2 for calling the DenseCostMatrix obj's underlying member method code with example usage: obj.to_dense() and returns: self