def save_task_checkpoint(file_path, task_num):
    """
    Saves the current state of the model for a given task by copying existing checkpoint created by the
    save_checkpoint function.

    Parameters:
        file_path (str): Path to save the file,
        task_num (int): Number of task increment.
    """
    save_path = os.path.join(file_path, 'checkpoint_task_' + str(task_num) + '.pth.tar')
    shutil.copyfile(os.path.join(file_path, 'checkpoint.pth.tar'), save_path)