Create comments for DatasetLoader

[brianRey2017]

• [x] _Get_downloaded_flag
• [x] _Get_status_flag
• [x] _Get_preprocessed_flag
• [x] _Load
• [x] _Get_klass_id_for_filename
• [x] _Preprocess
• [x] _Set_downloaded
• [x] _Set_preprocessed_flag
• [x] _Set_status_flag

[brianRey2017]

@facundoq Esta función tiene un parametro value que no termino de entender cual es su uso

def _set_status_flag(self, path, status, value=True):
        """
        Flags are used as a way to control that a stage ended successfully.
        This method creates a file used for that control process.

        Args:
            path(str): The path where the status file will be created
            status(str): The name of the status file
        """
        status_path = os.path.join(path, status)
        if not os.path.exists(status_path):
            open(status_path, 'a').close()
        else:
            raise ValueError(f"Status {status} already set on {path}")

[brianRey2017]

All the work is done. @facundoq Check the comments. If you approve it, close the issue :smile:

[facundoq]

@brianRey2017 El value estaba originalmente para que si es True se cree el archivo, y si es False se borre. Después me di cuenta que no era necesario porque no tiene sentido poner en False eso.

Quedó joya!