执行神经网络训练时报错。model.fit时就报异常，系统是TF2.3,win10 #58
Description
tensorflow.python.framework.errors_impl.UnimplementedError: Cast string to float is not supported,
意思是不能将字符型转浮点型。
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tensorflow.python.framework.errors_impl.UnimplementedError: Cast string to float is not supported,
意思是不能将字符型转浮点型。