code: def read_depth_png(self):
      assert self.depth_path.endswith(".png")
      if self.dataset == "mono":
          _depth = imageio.imread(self.depth_path) / 10000.0
      assert (_depth >= 0).all()
      return _depth
  
imports: import os
  import abc
  import numpy
  import imageio
  import PIL
  from PIL import Image
label_desc: Use image node_id 2 for calling the CapturedDepth obj's underlying member method code with example usage: obj.read_depth_png() and returns: _depth