Function ml__start_training_from_checkpoint 

pub unsafe extern "C" fn ml__start_training_from_checkpoint(
    hive_url_ptr: *const u8,
    hive_url_len: u32,
    hive_port: u32,
    game_name_ptr: *const u8,
    game_name_len: u32,
    experiment_name_ptr: *const u8,
    experiment_name_len: u32,
    num_features: u32,
    num_actions: u32,
    num_remote_workers: u32,
    config_ptr: *const u8,
    config_len: u32,
    checkpoint_ptr: *const u8,
    checkpoint_len: u32,
    __ark_ffi_output: *mut FutureHandle,
) -> ErrorCode

Starts training from a checkpoint.

The promise outputs a TrainingHandle.