old_contents: """Utility to load compute graphs from diffrent sources."""
  
  import os
  
  def load_compute_graph(name):
    path = os.path.join('/opt/aiy/models', name)
    with open(path, 'rb') as f:
      return f.read()
  
  
new_contents: """Utility to load compute graphs from diffrent sources."""
  
  import os
  
  
  def load_compute_graph(name):
    path = os.environ.get('VISION_BONNET_MODELS_PATH', '/opt/aiy/models')
    with open(os.path.join(path, name), 'rb') as f:
      return f.read()
  
subject: Use VISION_BONNET_MODELS_PATH env var for custom models path.