Commit 2491c2c5 authored by Igor Babuschkin's avatar Igor Babuschkin Committed by Vijay Vasudevan
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Make sure that concat complains about concat_dim < 0 (#2871) 

* Make sure that concat complains about concat_dim < 0

Currently tf.concat already checks whether concat_dim is too large for
the provided arguments at graph construction, but it should also make
sure that its >= 0.

This fixes #2868.

* Address comments

* Fix indentation in concat op tests
parent 7644b3dd
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