update config of example and README

[LucienZhang]

the shape of cifar-10 should 32x32, and updated the description in README.

[iizukak]

@LucienZhang Test dose not passed. Please check CI :)

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[iizukak]

@LucienZhang
Thank you for the PR.
This PR include some different changes.

1. Fix the documentation.
2. Change config values related with CIFAR 10 image size
3. Other config changes.

Can you separate PR?
And please remove change in license header.

[iizukak]

Why you change this?

[iizukak]

I recommend you to create issues.

[CLAassistant]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you all sign our Contributor License Agreement before we can accept your contribution.
1 out of 2 committers have signed the CLA.

✅ iizukak
❌ LucienZhang
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[CLAassistant]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you all sign our Contributor License Agreement before we can accept your contribution.
1 out of 2 committers have signed the CLA.

✅ iizukak
❌ LucienZhang
_{You have signed the CLA already but the status is still pending? Let us recheck it.}