Chainer 3.0.0

[Hakuyume]

• Update README
• Update travis config
• Variable.data -> Variable.array (Add Variable.array that is less confusing than Variable.data chainer#3223)
• Use as_variable (Add chainer.as_variable chainer#3218)
• Use ConcatenatedDataset (Add ConcatenatedDataset chainer#2780)
• Use cupy.argsort (Implement cupy.argsort cupy/cupy#67, cupy.argsort for arrays of rank two or more cupy/cupy#288)
• Remove if statement related to reduction bug ([backport] Fix simple reduction cupy/cupy#505)
• Use apply() instead of __call__() for MaxPooling2D (New style pooling functions chainer#3257)
• Install PyTest for testing.attr (Move to PyTest instead of nose chainer#3324)

[yuyu2172]

SegNet test fails due to Chainer 3.0.0 change.
#487

[Hakuyume]

@yuyu2172 Thank you. I fixed it. Currently, Travis CI does not run any tests of SegNet because they are marked as slow.

[Hakuyume]

@yuyu2172

[yuyu2172]

How about not repeating the sentence "This branch is unmaintained".

[yuyu2172]

Sorry for being late!

[yuyu2172]

Should we add attributes for all methods or just one for each class?
I prefer declaring attr.slow for a class if all tests are slow because there are less code.

[Hakuyume]

Should we add attributes for all methods or just one for each class?
I prefer declaring attr.slow for a class if all tests are slow because there are less code.

I also prefer declaring attr.slow for a class. However, it does not work since Chainer v3.1. I guess this is related to migration to PyTest.

[yuyu2172]

I see.
This would force us to change other tests too.

[Hakuyume]

Yes. I changed other tests, too.

[yuyu2172]

LGTM