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嗯，版本问题，固件不兼容了，需要回退版本4.5.4
版本问题，4.6.0也会出现，回退版本4.5.4就可以了
@avco 版本问题，4.6.0也会出现，需要回退固件版本到4.5.4，
官方的例子也是一样,应该是版本的问题，这么长时间了也没解决？ https://book.openmv.cc/example/25-Machine-Learning/tf-mnist.html https://book.openmv.cc/project/traffic-sign.html
