def set_up_folder_name_1M ( model_file , date_run ):
    """
    Produce log_file, plot_folder based on model_file (file name ending with _sd.pt)
    If model_file is epoch_1_sd.pt, date_run is 0913: plot_folder 'plot_2d_epoch_1', log file 'log_0913_2d_epoch_1'
    """
    # if model_file == '': model_pure = f'ep{ep_ind}'
    model_pure = model_file[:model_file.rfind('_sd.pt')]
    plot_folder = f'plot_2d_{model_pure}'
    log_file = f'log_{date_run}_2d_{model_pure}'  # .out  This is the log file, recording the printing
    return log_file, plot_folder