code: def is_eligible_example(annotation, percent_blank=0.5):
      num_objects = len(annotation["object"])
      blank = annotation["num_blank"] / float(annotation["num_total"])
  
      return num_objects > 0 and blank < percent_blank
  
imports: import pickle
  import glob
  import os
  import json
  import spacenet_utils
  from PIL import Image, ImageDraw
  from collections import OrderedDict
  import ingest_utils
  import numpy
  from tqdm import tqdm
  import warnings
  from configargparse import ArgumentParser
  from neon.util.persist import get_data_cache_or_nothing
label_desc: Use image node_id 2 for calling a global function with example usage: is_eligible_example(annotation, percent_blank) and returns: unknown