解決報錯Could not satisfy explicit device specification '' because the node was colocated with a group of nodes that required incompatible device '/device:GPU:0'

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sess = tf.Session(config=tf.ConfigProto(log_device_placement=True))
改為如下：
sess = tf.Session(config=tf.ConfigProto(allow_soft_placement=True, log_device_placement=True))

備忘：allow_soft_placement=True表示當沒有GPU實現可用時，使用將允許TensorFlow回退到CPU。

解決報錯Could not satisfy explicit device specification '' because the node was colocated with a group of nodes that required incompatible device '/device:GPU:0'