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According to the code below:
```python
if key is not None:
      combined_message = tf.concat(axis=1, values=[message, key])
else:
      combined_message = message
```python
If the key=None, combined_message is just message, not the key.

installation link broken

* make batcher compatible for py3

* make prefetcher and operations in ops compatible for py3

* use six.iteritem

* make all tests in  compatible with py3

* simplify usage of six and modify import order

* add back the space line

This works around a bug in earlier proto versions
that automatically infer these values to be integer
instead of float.

* Add export inference_graph

* Update Readme.md to include export_inference_graph

from Google internal link

* make slim_walkthrough ipython notebook python3 compatible

* make slim_walkthrough ipython notebook python3 compatible

iteritems -> items

Fixes #1585

Fix broken link to mscoco.org

URL returns 404

Fix URL

Remove the erroneous comment from resnet_v2.py again

Thanks for the good work!

update sequence loss to contrib from legacy

Update cifar10_input.py

Add object_detection to the main README

Reduce batchsize from 32->24 for SSD configs.

Reproduce reported virtual adversarial text results

Fixing the initialization/loading bug.

Implemented LRN for AlexNet tutorial

Update username and add new line in READMEs.

For details see our paper:
"Speed/accuracy trade-offs for modern convolutional object detectors."
Huang J, Rathod V, Sun C, Zhu M, Korattikara A, Fathi A, Fischer I,
Wojna Z, Song Y, Guadarrama S, Murphy K, CVPR 2017
https://arxiv.org/abs/1611.10012