  
          argument_list.append({"opts": ("-be", "--backend"),
                                "action": Radio,
                                "type": str.upper,
                                "choices": ("CPU", "OPENCL"),
                                "default": "CPU",
                                "help": "Backend to use for VGG Face inference. OpenCL is slightly "
                                        "faster but may not be available on all systems. Only used "
                                        "for sort by 'face'."})
  
          argument_list.append({"opts": ('-l', '--log-changes'),
                                "action": 'store_true',
                                "dest": 'log_changes',
                                "default": False,
 
</s> remove from lib.vgg_face import VGGFace
 </s> add from lib.vgg_face2_keras import VGGFace2 as VGGFace
                              "choices": ("CPU", "GPU"),
                              "default": "GPU",
                              "help": "Backend to use for VGG Face inference."
                                      "Only used for sort by 'face'."})
  
          argument_list.append({"opts": ("-be", "--backend"),
                                "action": Radio,
                                "type": str.upper,
                              "choices": ("CPU", "GPU"),
                              "default": "GPU",
                              "help": "Backend to use for VGG Face inference."
                                      "Only used for sort by 'face'."})
                              "choices": ("CPU", "GPU"),
                              "default": "GPU",
                              "help": "Backend to use for VGG Face inference."
                                      "Only used for sort by 'face'."})
                              "choices": ("CPU", "GPU"),
                              "default": "GPU",
                              "help": "Backend to use for VGG Face inference."
                                      "Only used for sort by 'face'."})
                              "choices": ("CPU", "GPU"),
                              "default": "GPU",
                              "help": "Backend to use for VGG Face inference."
                                      "Only used for sort by 'face'."})
                              "choices": ("CPU", "GPU"),
                              "default": "GPU",
                              "help": "Backend to use for VGG Face inference."
                                      "Only used for sort by 'face'."})
  
          argument_list.append({"opts": ('-l', '--log-changes'),
                                "action": 'store_true',
                                "dest": 'log_changes',
                                "default": False,
keep keep keep keep replace replace replace replace replace keep keep keep keep keep
 Switch to keras version for sort face (#791)

Upgrade to vgg_face2 (keras) to speed up sort by face 
tools/cli.py