code: def _gen_image(self, *shape):
      return np.random.rand(*shape)
  
imports: import numpy
  import tensorflow
  from easydict import EasyDict
  from luminoth.utils.image import resize_image, flip_image, random_patch, random_resize, random_distortion, patch_image
  from luminoth.utils.test.gt_boxes import generate_gt_boxes
label_desc: Use image node_id 2 for calling the ImageTest obj's underlying member method code with example usage: obj._gen_image() and returns: np