Function ggml_opt_epoch_callback_progress_bar 

pub unsafe extern "C" fn ggml_opt_epoch_callback_progress_bar(
    train: bool,
    opt_ctx: ggml_opt_context_t,
    dataset: ggml_opt_dataset_t,
    result: ggml_opt_result_t,
    ibatch: i64,
    ibatch_max: i64,
    t_start_us: i64,
)