Here is the same dynamic RNN implemented in 4 different frameworks (TensorFlow/Keras, MXNet/Gluon, Chainer, PyTorch). Can you tell which is which?pic.twitter.com/nsfuTULlKS
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You'll hear some say, "you can't implement X in framework Y, you need framework Z". It was already nonsense before all frameworks supported the same API style, but it's even more ridiculous now that you can port code from one library to any other with only minor syntax changes 
It's in the same category of nonsense as people claiming "you get better accuracy if you implement this model in framework X!" -- the output of an algorithm does not depend on the language you implement it in.
Interesting that you have called it "Model subclassing API". Have you identified any other interesting styles and patterns?
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