(This is a draft).

Usability Improvement

• Improved the usability of examples and tutorials

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• Integrated MKLDNN for CPU training and inference acceleration. The high-level design is at The design of MKLDNN integration.

Bug-fixes

• Fix I/O multiprocessing for too many open file handles (#8904), race condition (#8995), deadlock (#9126).

• Fix image IO integration with OpenCV 3.3 (#8757).

• Fix Gluon block printing (#8956).

• Fix float16 argmax when there is negative input. (#9149)

• Fix random number generator to ensure sufficient randomness. (#9119, #9256, #9300)

• Fix custom op multi-GPU scaling (#9283)

• Fix gradient of gather_nd when duplicate entries exist in index. (#9200)

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