Change placeholder exception to log instead of throwing an exception.
authorRussell Power <power@google.com>
Fri, 5 Jan 2018 20:51:39 +0000 (12:51 -0800)
committerTensorFlower Gardener <gardener@tensorflow.org>
Fri, 5 Jan 2018 20:55:41 +0000 (12:55 -0800)
commit620c8383123519fcf4d987efb9776d861901ccfa
treea2c7ae80f8a6066d7f68dc575b9f8eb9a389c763
parenta17038297c82357634913603ce88994a3e3ea3bf
Change placeholder exception to log instead of throwing an exception.

It is difficult to remove placeholders from existing meta-graphs without breaking other structures.  As long as the placeholders do not contribute towards the loss/evaluation function they are harmless.

PiperOrigin-RevId: 180963420
tensorflow/contrib/tpu/python/tpu/tpu.py