class_docstr: Extract image feature using pretrained CNN network.
class_docstr_tok: ["Extract","image","feature","using","pretrained","CNN","network","."]
docstr: Get a list of the available model variants in this ImageLoader.
docstr_tok: ["Get","a","list","of","the","available","model","variants","in","this","ImageLoader","."]
code: def get_available_model_names(cls):
      """
      Get a list of the available model variants in this ImageLoader.
      """
      return list(IMAGE_MODE_SWITCHER.keys())
  
imports: import parlai.core.build_data
  import parlai.utils.logging
  from parlai.utils.io import PathManager
  import os
  from PIL import Image
  import torch
  from zipfile import ZipFile
label_desc: Use image node_id 7 for calling the ImageLoader obj's underlying member method code with example usage: obj.get_available_model_names(cls) and returns: list