Add dataset loader for FER2013

[iizukak]

FER2013 is the dataset for Face Expression Recognition.
7 class classification.

It's looks better for tutorial than CIFAR10.

https://www.kaggle.com/c/challenges-in-representation-learning-facial-expression-recognition-challenge/data

[kalpitthakkar-lm]

@iizukak I can work on this. Seems like a good issue to get warmed up.
Can you assign me to the issue?

[kalpitthakkar-lm]

Ah, infact, FER2013 dataset images are not available anywhere. We need to find an alternative.

[iizukak]

@kalpitthakkar-lm FER2013 dataset can be download from kaggle. (login required)
https://www.kaggle.com/c/challenges-in-representation-learning-facial-expression-recognition-challenge/data

[kalpitthakkar-lm]

@iizukak Can you download it?
I am not able to access it even after login. It keeps showing an error in loading data.

[iizukak]

@kalpitthakkar-lm
Last month, I did download dataset. But now, there is not download link...

[kalpitthakkar-lm]

@iizukak What should we do? Do you have any idea for alternative example?

How about this: http://vision.ucsd.edu/~iskwak/ExtYaleDatabase/ExtYaleB.html

[iizukak]

@kalpitthakkar-lm
Can you try to download?
https://www.kaggle.com/shawon10/facial-expression-detection-cnn/data

[kalpitthakkar-lm]

@iizukak This does not have the images!

[iizukak]

@kalpitthakkar-lm CSV contains image data

[kalpitthakkar-lm]

@iizukak I got the dataset.

Okay, so how should I proceed?
Do we only need the dataset loader for FER2013?

[iizukak]

@kalpitthakkar-lm Yes. Dataset loader.
metrics and loss, ... are already exist.

[iizukak]

closed with #1172