pub unsafe extern "C" fn llama_opt_epoch(
lctx: *mut llama_context,
dataset: ggml_opt_dataset_t,
result_train: ggml_opt_result_t,
result_eval: ggml_opt_result_t,
idata_split: i64,
callback_train: ggml_opt_epoch_callback,
callback_eval: ggml_opt_epoch_callback,
)