  
          model_filename: The name of the model to be loaded (see notes below)
          cache_dir:      The model cache folder of the current plugin calling this class
                          IE: The folder that holds the model to be loaded.
  
          NB: Models must have a certain naming convention:
              IE: <model_name>_v<version_number>.<extension>
              EG: s3fd_v1.pb
  
              Multiple models can exist within the model_filename. They should be passed as a list
 
</s> remove 
            Models to be handled by this class must be added to the _model_id property
            with their appropriate github identier mapped.
            See https://github.com/deepfakes-models/faceswap-models for more information
 </s> add  </s> remove                               "help": "Reference images for the person you "
                                      "want to process. Should be a front "
                                      "portrait. Multiple images can be added "
                                      "space separated"})
 </s> add                               "help": "Reference images for the person you want to process. "
                                      "Should be a front portrait with a single person in the "
                                      "image. Multiple images can be added space separated. NB: "
                                      "Using face filter will significantly decrease extraction "
                                      "speed."}) </s> remove                               "help": "Reference image for the persons you do "
                                      "not want to process. Should be a front "
                                      "portrait. Multiple images can be added "
                                      "space separated"})
 </s> add                               "help": "Reference image for the persons you do not want to "
                                      "process. Should be a front portrait with a single person "
                                      "in the image. Multiple images can be added space "
                                      "separated. NB: Using face filter will significantly "
                                      "decrease extraction speed."}) </s> remove     @property
    def _model_id(self):
        """ Return a mapping of model names to model ids as stored in github """
        ids = {
            # EXTRACT (SECTION 1)
            "face-alignment-network_2d4": 0,
            "cnn-facial-landmark": 1,
            "mtcnn_det": 2,
            "s3fd": 3,
            "resnet_ssd": 4,
            # TRAIN (SECTION 2)
            # CONVERT (SECTION 3)
            }
        return ids[self._model_name]

 </s> add  </s> remove                                    str(err), attempt + 2, attempts)
 </s> add                                    str(err), attempt + 2, self.retries)
        git_model_id:   The second digit in the github tag that identifies this model.
                        See https://github.com/deepfakes-models/faceswap-models for more
                        information
  
          model_filename: The name of the model to be loaded (see notes below)
          cache_dir:      The model cache folder of the current plugin calling this class
                          IE: The folder that holds the model to be loaded.
        git_model_id:   The second digit in the github tag that identifies this model.
                        See https://github.com/deepfakes-models/faceswap-models for more
                        information
  
          NB: Models must have a certain naming convention:
              IE: <model_name>_v<version_number>.<extension>
              EG: s3fd_v1.pb
  
              Multiple models can exist within the model_filename. They should be passed as a list
keep keep keep add keep keep keep keep keep keep
 Face filter vgg face (#724)

* Implement extraction pipeline

* Face filter to vgg_face. Resume partial model downloads

* On-the-fly conversion to extraction pipeline

* Move git model ids from get_model to model definition 
lib/utils.py