Python 字典问题

问题遇到的现象和发生背景

这段代码该怎么理解呀，查都查不到

models = {}
def get_model(name, num_cls=10, **args):
    net = models[name](num_cls=num_cls, **args)
    if torch.cuda.is_available():
        net = net.cuda()
    return net