code: def shape(self):
      return self.arr.shape
  
imports: import warnings
  from itertools import product
  import numpy
  import pytest
  from ..filebasedimages import FileBasedHeader, FileBasedImage, SerializableImage
  from .test_image_api import GenericImageAPI, SerializeMixin
label_desc: Use image node_id 2 for calling the FBNumpyImage obj's underlying member method code with example usage: obj.shape() and returns: self