feat: add support for Qwen3-Next model and add Flash Linear Kernels#1510
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FLA kernels based on https://github.com/fla-org/flash-linear-attention, qwen3 modeling code based on vllm-project/vllm#24526
Speeds are great.
Llama-3.1 70B, 8x 3090, TP=8:
E2E time: 12.89s, TTFT: 2.38s, Prefill: 1907 tokens (800.5 tokens/s), Decode: 306 tokens (29.1 tokens/s)Qwen3-Next-80B-A3B, 8x 3090, TP=8:
E2E time: 4.33s, TTFT: 0.47s, Prefill: 1905 tokens (4051.1 tokens/s), Decode: 355 tokens (92.0 tokens/s)