Default Window Function for STFT in data_module.py is sqrthann or hann?

[pangy9]

It is written on line 235 of data_module.py that parser.add_argument("--window", type=str, choices=("sqrthann", "hann"), default="hann", help="The window function to use for the STFT. 'sqrthann' by default.").
This seems contradictory. You said the default is "sqrthann," but in reality, the default choice is "hann." So which configuration is used in the paper?