Edited at

TensorFlow > Tensor Transformations > labels = to_tf.int64(labels)

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https://www.tensorflow.org/versions/master/tutorials/mnist/tf/index.html#tensorflow-mechanics-101

において出てきた型変換.


Loss

First, the values from the labels_placeholder are converted to 64-bit integers.

...


labels = tf.to_int64(labels)

Tensor Transformations

というらしい。

https://www.tensorflow.org/versions/r0.11/api_docs/python/array_ops.html