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[Feature] support mtp3 #33561

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[Feature] support mtp3 #33561

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c7b6eac
feat: support mtp3
mingMelody Feb 2, 2026
feaafdc
fix: function signature
mingMelody Feb 2, 2026
40bf7fe
fix: mtp1 acc with pcg
mingMelody Feb 2, 2026
375a5cf
fix: remove eagle change & useless significance
mingMelody Feb 3, 2026
1b4549b
refactor: cache draft states in req_states
mingMelody Feb 5, 2026
85c581e
update unittest
mingMelody Feb 5, 2026
08b5f5c
update shift and gather 1d kernel
mingMelody Feb 6, 2026
aa8bd05
update shift and gather hidden kernel
mingMelody Feb 6, 2026
a7ed9a4
add comment for triton kernel
mingMelody Feb 9, 2026
873f252
refactor: remove duplicate code
mingMelody Feb 10, 2026
10cd5cb
tidy
mingMelody Feb 10, 2026
3f60ca1
add comment and remove dead code
mingMelody Mar 26, 2026
5afa41b
Merge remote-tracking branch 'origin/main' into feat/support-mtp3
mingMelody Mar 26, 2026
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15 changes: 14 additions & 1 deletion examples/offline_inference/spec_decode.py
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Original file line number Diff line number Diff line change
Expand Up @@ -62,6 +62,11 @@ def parse_args():
parser.add_argument("--tp", type=int, default=1)
parser.add_argument("--enforce-eager", action="store_true")
parser.add_argument("--enable-chunked-prefill", action="store_true")
parser.add_argument(
"--enable-multi-layers-mtp",
action="store_true",
help="Enable multi-layer MTP (only effective when --method=mtp).",
)
parser.add_argument("--max-model-len", type=int, default=16384)
parser.add_argument("--temp", type=float, default=0)
parser.add_argument("--top-p", type=float, default=1.0)
Expand All @@ -71,12 +76,14 @@ def parse_args():
parser.add_argument("--model-dir", type=str, default=None)
parser.add_argument("--eagle-dir", type=str, default=None)
parser.add_argument("--draft-model", type=str, default=None)
parser.add_argument("--tokenizer-dir", type=str, default=None)
parser.add_argument("--custom-mm-prompts", action="store_true")
parser.add_argument("--gpu-memory-utilization", type=float, default=0.9)
parser.add_argument("--disable-padded-drafter-batch", action="store_true")
parser.add_argument("--max-num-seqs", type=int, default=None)
parser.add_argument("--parallel-drafting", action="store_true")
parser.add_argument("--allowed-local-media-path", type=str, default="")
parser.add_argument("--trust-remote-code", action="store_true")
return parser.parse_args()


Expand All @@ -90,7 +97,11 @@ def main(args):
"please specify model_dir to give a mm based model"
)
model_dir = "meta-llama/Llama-3.1-8B-Instruct"
tokenizer = AutoTokenizer.from_pretrained(model_dir)
tokenizer_dir = args.tokenizer_dir
if tokenizer_dir is None:
tokenizer_dir = model_dir

tokenizer = AutoTokenizer.from_pretrained(tokenizer_dir)

if args.custom_mm_prompts:
prompts = llm_prompts = get_custom_mm_prompts(args.num_prompts)
Expand Down Expand Up @@ -146,6 +157,8 @@ def main(args):
"method": "mtp",
"num_speculative_tokens": args.num_spec_tokens,
}
if args.enable_multi_layers_mtp:
speculative_config["enable_multi_layers_mtp"] = True
else:
raise ValueError(f"unknown method: {args.method}")

Expand Down
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