code: def checkpoints() -> List[str]:
      """Returns the Lightly model zoo as a list of checkpoints.
  
      Checkpoints:
          ResNet-9:
              SimCLR with width = 0.0625 and num_ftrs = 16
          ResNet-9:
              SimCLR with width = 0.125 and num_ftrs = 16
          ResNet-18:
              SimCLR with width = 1.0 and num_ftrs = 16
          ResNet-18:
              SimCLR with width = 1.0 and num_ftrs = 32
          ResNet-34:
              SimCLR with width = 1.0 and num_ftrs = 16
          ResNet-34:
              SimCLR with width = 1.0 and num_ftrs = 32
  
      Returns:
          A list of available checkpoints as URLs.
  
      """
      return [item for key, item in ZOO.items()]
  
label_desc: Use image node_id 1 for calling a global function with example usage: checkpoints() and returns: unknown