How to use the mlpm.handler.handle_post_solver_train_or_infer function in mlpm

async def infer():
    if request.method == 'POST':
        return await handle_post_solver_train_or_infer(request, UPLOAD_INFER_FOLDER,
                                                 "infer", PUBLIC_FOLDER)

async def train(request):
    if request.method == "POST":
        return handle_post_solver_train_or_infer(request, UPLOAD_TRAIN_FOLDER,
                                          "train")

async def train():
    if request.method == "POST":
        return await handle_post_solver_train_or_infer(request, UPLOAD_TRAIN_FOLDER,
                                                 "train", PUBLIC_FOLDER)

async def infer(request):
    if request.method == 'POST':
        return handle_post_solver_train_or_infer(request, UPLOAD_INFER_FOLDER,
                                          "infer")