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Decoding Spekulatif dengan EAGLE
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Speculative decoding can speed up large-model generation by letting a faster drafter propose tokens for a target model to verify in batches.
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Exact speculative sampling can preserve the target distribution, but speedup depends on draft cost, acceptance rate, batching and hardware.
Normally an LLM generates text one token at a time: each token requires a full forward pass through the giant model, and you can't start the next until the current one finishes. For large models at low batch sizes, decoding can be memory-bandwidth bound: each token step reads many weights, so moving data may dominate arithmetic. Other batch sizes and workloads can have different bottlenecks. Speculative decoding breaks the bottleneck. A small, cheap draft model proposes a chunk of, say, five candidate tokens. The large 'target' model then processes all five in a single parallel forward pass and checks them. In greedy decoding, the target accepts the matching prefix and uses its own token at the first mismatch, discarding the remaining draft. Exact sampling uses a rejection-sampling correction to preserve the target distribution; acceptance is not always simple token equality. The target can verify a drafted block in a parallel pass, but verification still costs computation. Net speedup depends on draft-model cost, how many tokens are accepted, and the hardware and workload.
Model draf 7B mengusulkan token untuk model obrolan 70B guna mengurangi latensi respons di asisten produksi
Kepala Medusa dipasang ke LLM sehingga memprediksi beberapa token masa depan sekaligus tanpa model draf terpisah
vLLM memungkinkan decoding spekulatif untuk meningkatkan throughput token per detik pada cluster yang melayani
EAGLE menyusun ruang fitur tersembunyi model untuk meningkatkan tingkat penerimaan dan kecepatan keseluruhan
Serving frameworks offer speculative decoding and self-drafting variants, but the best method depends on the target model, workload and hardware. Systems should measure latency, throughput, acceptance rate, memory use and output-distribution requirements rather than assume a fixed speedup. Some methods use a separate drafter; others add heads or use feature-space proposals. Continued research is likely to improve these tradeoffs, but deployment gains must be measured on the actual service.
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Speculative decoding can speed up large-model generation by letting a faster drafter propose tokens for a target model to verify in batches. Exact speculative sampling can preserve the target distribution, but speedup depends on draft cost, acceptance rate, batching and hardware.
Model draf cepat mengusulkan banyak token, dan model target besar memeriksa semuanya dalam satu jalur paralel.
For large models at low batch sizes, repeatedly reading weights can dominate arithmetic, though the bottleneck depends on workload.
In greedy verification, the target corrects the first mismatch and the remaining drafted suffix is discarded; exact sampling uses a rejection-sampling correction instead.
The exact rejection-sampling correction preserves the target model’s distribution; this is distinct from relaxed variants.
Semakin banyak token yang dirancang yang diterima model target per langkah verifikasi, semakin besar kecepatannya.
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Decoding Spekulatif dengan EAGLE
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