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The `sparse` version is more efficient anyway.

I'm returning the labels shape [1] instead of []
because tf.accuracy fails otherwise.

assert fails on requesting gpus when not available

Add @protoget and @tfboyd as cifar10_estimator owners

Use r-string to avoid raising Python 3 SyntaxError

file() was removed in Python 3 (en masse)

Revert "Add multi-GPU to MNIST, take two (#3199)"

This reverts commit e8726907.

In Python 2 the string and the r-string behave the same:
$ __python2__
```
>>> '$\Uparrow$ '
'$\\Uparrow$ '
>>> r'$\Uparrow$ '
'$\\Uparrow$ '
>>> '$\Uparrow$ ' == r'$\Uparrow$ '
True
```

In Python 3 the string raises a Syntax Error while the r-string works just like Python 2.
```
>>> '$\Uparrow$ '
  File "<stdin>", line 1
SyntaxError: (unicode error) 'unicodeescape' codec can't decode bytes in position 1-2: truncated \UXXXXXXXX escape
>>> r'$\Uparrow$ '
'$\\Uparrow$ '
```

Add astronet directory and a temporary README.md

Fix Python 3 Syntax Errors (en masse)

long was removed in Python 3 (en masse)

See: https://github.com/tensorflow/models/pull/3220#discussion_r163131613

[samples/java]: Add some more descriptive text to the README

from six.moves import xrange (en masse)

Create __init__.py under research/object-detection/dataset_tools (Fix #3055)

Add multi-GPU flag to MNIST and allow for setting of replicated optimizer and model_fn

readme fixes

updated eval for python 3

change file open mode to rb

[samples/java]: Add a link to some slides.