错误：Graph execution error: Detected at node ‘sparse_categorical_crossentropy/SparseSoftmaxCrossEntropyWithLogits/SparseSoftmaxCrossEntropyWithLogits’ defined at (most recent call last):
实际上是损失函数的问题、
model.compile(optimizer= opt, loss= 'sparse_categorical_crossentropy', metrics=['accuracy']) # adam优化器，loss function，训练过程中计算准确率
解决错误方法：将loss= ‘sparse_categorical_crossentropy’改为
‘categorical_crossentropy’
model.compile(optimizer= opt, loss= 'categorical_crossentropy', metrics=['accuracy'])
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