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RWKV-LM
RWKV is an RNN with transformer-level LLM performance. It can be directly trained like a GPT (parallelizable). So it's combining the best of RNN and transformer - great performance, fast inference, saves VRAM, fast training, "infinite" ctx_len, and free sentence embedding.
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As posted above, it seems likely that GPT4 uses Flash Attention. Their GitHub page claims that an A100 tops out at 4k tokens. It was my understanding that this was a hard upper limit given the current hardware. So scaling to 32k wouldn't just mean throwing more compute at the problem, but rather a change in the architecture. Flash Attention is an architecture change that can achieve 32k (even 64k according to the GitHub page) context length on an A100.
Keep an eye on projects like this RWKV-LM that are looking promising in certain cases as they develop.