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[ROCm][Spec Decode] Enable adaptive DSpark verification for MiniMax M3 - #56451
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This pull request has merge conflicts that must be resolved before it can be |
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Please take 6.4–17.1% and 40.7% out of the summary. 6.4–17.1% is the NVIDIA default-head series, and both arms drop at c500 (fixed 568 → 459, adaptive 638 → 493). 40.7% is only the head-disabled c128 point (221 → 311); c256 in that same series is +10.6%. GSM8K 0.8167 → 0.8467 on 300 questions is about 9 extra correct answers. Zero invalid outputs. That is not a quality win. Two code points:
Also please convert to regular PR and report FP8/FP16 numbers. |
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This pull request has merge conflicts that must be resolved before it can be |
Signed-off-by: Oleksandr Kachur <oleksandr.kachur@amd.com>
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Thanks for the review Richard. Updated:
Removed the 6.4–17.1% and 40.7% figures. Since Nvidia confidence head is miscalibrated I expect better performance gains with OOB confidence estimator that was recently merged. Will add tests for this one as well
Done, Rerun on full GSM8K task set and updated description now says only that accuracy is preserved, with no claim of a quality gain
Summary updated: now it states that only the ROCm Triton indexer and sparse decode support ragged decode; CUDA and AITER still reject the query-length mismatch, so adaptive verification stays off there.
PR no longer adds
Paged decode: kept the
Done. |
The M3 BF16 adaptive run (TP8, nvidia drafter) is passing now, including the config that hung 3 of 3 times on the old build |
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/ci retry |
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✅ Queued 1 failed job(s) for retry in Buildkite CI #99540. |
simondanielsson
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Thanks for the updates! Nice work
Suggestion: can we also run gpqa and niah accuracy vs main?
Kind reminder: Let's keep the PR description up to date, currently it looks quite outdated
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| @classmethod | ||
| def supports_varlen_decode(cls) -> bool: | ||
| return current_platform.is_rocm() |
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Suggestion: can we make sure to test this also on cdna4, alt limit this to cdna3?
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we may need to make the code change in MiniMaxM3IndexerMetadataBuilder
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Instead of limiting MiniMaxM3IndexerTritonMetadataBuilder.supports_varlen_decode() to CDNA3, I extended test_decode_index_topk_varlen_with_padded_rows to cover each of those paths with ragged batches (random 1–8 query tokens per request plus zero-length padding rows) for topk 6 and 16: 16/16 pass on MI355X. The rest of test_minimax_m3.py, test_minimax_m3_varlen_cudagraph.py, test_minimax_m3_indexer_cp.py and test_prefix_prefill.py::test_contexted_kv_attention also pass on gfx950
If you'd still prefer a CDNA3 gate - happy to do that
| x = ( | ||
| torch.cat([hidden, markov_embed], dim=-1) if self.with_markov else hidden | ||
| ).float() | ||
| return self.proj(x).squeeze(-1) |
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this PR touches confidence head config format by modelopt which
Can you remind me why we do this here? Or could that be a separate PR
| # Varlen decode replays decode-only batches of 1 to 1 + K tokens per | ||
| # request; mixed prefill+decode batches never replay FULL graphs. | ||
| if not cls._use_varlen_decode(vllm_config) or ( | ||
| cls.get_cudagraph_support(vllm_config, kv_cache_spec) # type: ignore[attr-defined] |
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Question: is this mypy skip safe?
| if cur_batch_query_len > 1: | ||
| # FULL graphs may pad the request dimension with zero-length rows. | ||
| # This kernel handles exactly one query token per request. | ||
| if cur_batch_query_len != 1: |
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Question: is this strictly related to this PR?
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Yes. FULL graphs pad the request dimension with zero-length rows (query_start_loc[num_reqs+1:] = num_tokens). With > 1, those rows fall through to the decode path and that was the issue that popped up during implementation
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| @classmethod | ||
| def supports_device_cpu_query_lens_mismatch(cls) -> bool: | ||
| return cls.get_builder_cls().supports_varlen_decode() |
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Suggestion: I don't think is backwards compatible (see the implementation we override here) and will break cuda, should we do
super().supports_device_cpu_query_lens_mismatch() or cls.get_builder_cls().supports_varlen_decode()| device=device, | ||
| ) | ||
| self.varlen_decode = self._use_varlen_decode(vllm_config) | ||
| self.token_to_req_buffer = torch.empty( |
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Minor: for these, should we only allocate it if using varlen decode? Currently it will allocate these uncondintionally
| module = sys.modules[__name__] | ||
| monkeypatch.setattr(module, "NUM_Q_HEADS", num_q_heads) | ||
| monkeypatch.setattr(module, "NUM_KV_HEADS", num_kv_heads) | ||
| torch.manual_seed(0) |
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Nit: set_random_seed is preferred here 👍
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| def test_aiter_msa_indexer_builder_does_not_claim_varlen(): | ||
| indexer_msa = pytest.importorskip("vllm.models.minimax_m3.amd.indexer_msa") |
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Nit: not sure if we rather be explicit about when to skip this rather than using an importskip. E.g. require cuda-alike or similar
| indexer_msa = pytest.importorskip("vllm.models.minimax_m3.amd.indexer_msa") | ||
| builder = indexer_msa.MiniMaxM3IndexerMSAMetadataBuilder | ||
| assert not builder.supports_varlen_decode() | ||
| assert builder.get_varlen_cudagraph_max_query_len(_vllm_config(True), None) is None |
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Minor: can this and the test below be a single parametrized test?
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This pull request has merge conflicts that must be resolved before it can be |
… DSpark verification - Compose supports_device_cpu_query_lens_mismatch() with the base rule. - Allocate the token-to-request buffer only for varlen decode. - Drop the mypy ignore in VarlenDecodeBuilderMixin. - Move the DSpark confidence-head config fallback to its own PR. - Tests: set_random_seed, plain imports, one parametrized test for the uniform-only ROCm builders, backend-level query-lens gate test. Signed-off-by: Oleksandr Kachur <oleksandr.kachur@amd.com>
# Conflicts: # tests/kernels/attention/test_minimax_m3.py # vllm/models/minimax_m3/common/indexer.py # vllm/models/minimax_m3/common/sparse_attention.py
…_drafting Signed-off-by: Oleksandr Kachur <oleksandr.kachur@amd.com>
…tches The bf16 head_dim 128 score kernel picks the balanced, high-batch or default launch by request count on gfx950, and the topk=16 selector takes a short single chunk or 16 chunks. Parametrize the ragged index top-k test over batch shapes and topk so each of those paths sees varlen metadata. Signed-off-by: Oleksandr Kachur <oleksandr.kachur@amd.com>
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/ci run |
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✅ Triggered Buildkite CI #101830 for commit ℹ️ This PR is 8 commits behind upstream |
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/ci retry |
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✅ Queued 2 failed job(s) for retry in Buildkite CI #101830. |
gfx942 runs fp32 tl.dot on xf32 MFMA, so the indexer's block scores can differ from the exact fp32 reference by a few 1e-3. With topk=16 that can swap two blocks that tie the 16th-best score. Compare the kernel's selection against the reference block scores instead: a block may differ from the reference only when its score is within tolerance of the k-th best, and padding tokens must select nothing. Signed-off-by: Oleksandr Kachur <oleksandr.kachur@amd.com>
…n' into pr56451-review3
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/ci run |
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✅ Triggered Buildkite CI #101895 for commit ℹ️ This PR is 12 commits behind upstream |
Summary
Enables adaptive DSpark verification for MiniMax M3 on ROCm. Part of the adaptive DSpark backend expansion (#51303): each model needs varlen-capable sparse kernels before adaptive verification can redistribute draft tokens across requests.
Scope: only the ROCm Triton indexer and Triton sparse-decode paths gain ragged decode support (validated on MI325/gfx942 and MI355X/gfx950). The CUDA backends, the AITER MSA indexer / AITER sparse PA, the ROCm NVFP4 sparse path and the indexer CP path keep reporting device/CPU query-length mismatch as unsupported, so the selector keeps adaptive verification off there. With adaptive verification off, the uniform decode path is unchanged.
Changes
query_sta rt_loc, using upstream'scompute_token_to_req_indices(a device-side binary search that doesn't depend onmax_query_lenand handles zero-length padding rows). Shared builder logic lives inmodels/minimax_m3/common/varlen_decode.py.UNIFORM_BATCHand advertise the bounded varlen contract (get_varlen_cudagraph_max _query_len=1 + num_speculative_tokens) only when adaptive verification is enabled. Mixed prefill+decode batchesnever replay FULL graphs.
supports_device_cpu_query_lens_mismatch()on the MiniMax indexer/sparse backends is true only when the base ruleholds and the builder has ragged decode kernels.
kernel_paged_attention_2d: return forquery_len != 1(previously> 1). FULL cudagraph replay pads the request dimension with zero-length rows, which fell into the decode path and read/wrote the row one past the last real token.ROCM_ATTNreportsALWAYS, so it replays the ragged decode graphs adaptive verification producesminimax_m3_indexer_cp) rejects adaptive verification explicitly; its decode scores uniform rows.The DSpark confidence-head config fallback that was here earlier removed
Testing
tests/kernels/attention/test_minimax_m3.py(incl. ragged index top-k and ragged sparse decode with zero-length padding rows, TP1–TP8 head shapes): pass on MI325 (gfx942) and MI355X (gfx950). The ragged index top-k test covers every gfx950 indexer decode launch path (balanced, high-batch and default score launches; single- and 16-chunk topk=16 selector).tests/kernels/attention/test_minimax_m3_varlen_cudagraph.py,test_minimax_m3_indexer_cp.py: pass.test_prefix_prefill.py::test_contexted_kv_attention(now with a trailing zero-length row): pass on gfx942 and gfx950.tests/v1/spec_decode/test_adaptive_verification.py,tests/v1/worker/test_gpu_rejection_sampler_chunking.py,tests/v1/worker/test_attn_utils.py: pass.–512 requests (1–8 query tokens each, up to 4K context, zero-length padding rows), reference-checked every 10th batch: all passed.
End-to-end results
MI325,
nvidia/MiniMax-M3-DSparkdrafter,num_speculative_tokens=7, FULL cudagraphs, default memory settings,--max-model-len 4096 --max-num-seqs 512. Fixed vs adaptive verification on the same build. This drafter declares a confidence head but ships noconfidence_head.*weights, so adaptive verification uses the online acceptance estimator (#52228).GSM8K, full test set (1,319 questions, 5-shot, greedy, concurrency 64):
amd/MiniMax-M3-MXFP4MiniMaxAI/MiniMax-M3-MXFP8MiniMaxAI/MiniMax-M3(BF16)Repeated MXFP8 runs vary by about ±0.01 for both modes (fixed 0.860–0.878 over 6 runs, adaptive 0.867–0.879 over 9 runs).
MI355X (gfx950),
amd/MiniMax-M3-MXFP4, TP=2, same drafter and K=7, AITER MXFP4 MoE, FULL cudagraphs,--max-model-len 32768. main (fixed verification) vs this PR (adaptive verification):Sonnet 550 in / 150 out / 200 shared prefix, ignore EOS, output tok/s (adaptive gain vs fixed):
The gain shrinks as verification gets cheaper: TP=4 and TP=8 leave little verify cost for adaptive budgeting to saver MXFP8 fixed verification at concurrency 500 runs out of memory allocating the full verification logits (1.6 GB) at the default
--gpu-memory-utilization; adaptive verification bounds that allocation and completes all requests.BF16, TP=8, after #62769 (latest build), c512, 1k OSL: adaptive 3,322.8 tok/s (acceptance length 2.28) vs fixed k=7 3,082.1 tok/s (acceptance length 3.3); GSM8K 0.961 vs 0.959. The config that previously hung with
GPU Hangat concurrency ≥ 380 now passes.Earlier results (before rebase)
MXFP4 target with the
olka-fi/MiniMax-M3-MXFP4-DSparkdrafter, TP=2, same Sonnet workload, 3–5 minute steady-state runs; 9,040 requests, none failed.