offset & code about a2j HOT 3 OPEN

@shangchengPKU Hi,

1. The idea of predicting offset instead of pixel-wise probability is wide-applied recently (e.g., "Dense 3D Regression for Hand Pose Estimation", "AWR: Adaptive Weighting Regression for 3D Hand Pose Estimation", "Point-to-Point Regression PointNet for 3D Hand Pose Estimation").
   In my opinion, predicting offset makes the output joints more accurate.
2. Sorry I don't understand your question very clearly. We use center point and bndbox to crop the hand/human-centered sub-image, mean/std normalize the original data.

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@zhangboshen
I understand the first question, the second question I read the relevant code, also understand, thank you very much, and I love you this article! Thank you again!

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@shangchengPKU
Glad to hear that. And thank you for your kind attention to our work.

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