code: def list_models(filename):
      
      from .h5file import H5File
      with H5File(filename, mode='r') as f:
          return f.models_descriptive
docs: Lists all models in given filename.
  
      Parameters
      ----------
      filename: str
          path to filename, where the model has been stored.
  
      Returns
      -------
      obj: dict
          A mapping by name and a comprehensive description like this:
          {model_name: {'repr' : 'string representation, 'created': 'human readable date', ...}