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180211 Keras矩阵乘法MatMul报错 Shape must be rank 2 but is rank 3 for 'MatMul'
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原因1：Keras后端tensorflow与theano的矩阵乘法定义不同，切换后端即可
Switching from one backend to another
TensorFlow学习笔记–matmul和multiply两种乘法的区别
keras配置TensorFlow_or_theano
原因2：矩阵乘法没有按照定义来，需要根据定义修改代码
http://blog.csdn.net/u011961856/article/details/77336205
http://blog.csdn.net/blythe0107/article/details/74171870
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