fix(deepseek): wire layer-specific RoPE profiles - #156
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📝 WalkthroughWalkthroughChangesDeepSeek RoPE profile packing
Estimated code review effort: 3 (Moderate) | ~20 minutes Mergeability Score: ⚪ Minimal · up to The PR changes layer-specific RoPE profile construction and buffer sizing; the only identified follow-up is an explicit unit-test assertion for bfloat16 table dtypes, with no merge-blocking production impact. No actionable merge-blocking risk remains after normal checks and review. Possibly related PRs
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In `@tests/unit/model/deepseek/test_model_components.py`:
- Around line 86-91: Update the RoPE table test to explicitly assert that both
freqs_cos and freqs_sin have torch.bfloat16 dtype, in addition to the existing
shape and value checks.
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pypto_serving/model/deepseek/npu_executor.pypypto_serving/model/deepseek/npu_runner.pytests/unit/model/deepseek/test_model_components.py
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…953) - Stack the base and compressed YaRN RoPE tables into one parameter pair, widening freqs_cos/freqs_sin to [2, MAX_SEQ_LEN, ROPE_HEAD_DIM] in prefill, decode, and MTP, and to [N_RANKS, 2, ...] at the host. - Slice both profiles once per program and route the base profile to SWA layers 0-1 and the MTP draft layer, the compressed profile to the CSA and HCA layers. - Replace the FP32 AtomicAdd split-K accumulation in hc_pre's linear and RMS paths with disjoint per-split partial buffers reduced in ascending K order, retiring the zero-seed phase and one syncall barrier. - Do the same for qr_proj and kv_proj in qkv_proj_rope, adding spmd reduce scopes over the per-split partials and dropping the on-core seed scopes that the atomics required. - Publish MoE combine arrivals from a combine_wait scope gated on the whole scatter grid rather than folding one notify into each scatter block, so the wait expects moe_epoch instead of moe_epoch * N_LOCAL. - Drop allow_early_resolve from the combine scatter and its wait so the cross-rank handshake cannot reserve AIV cores ahead of the scatter. - Build the stacked profiles in the prefill and decode tensor specs. Long decode began coherently and then degraded into repetitive or malformed text at later positions. Driving every layer from the base table accumulated a growing phase error with position, and the split-K atomics summed FP32 partials in task-completion order, which is not fixed and not associative, so the same greedy request could diverge and then compound autoregressively. The stacked tables change the prefill and decode ABI; hw-native-sys/pypto-serving#156 carries the matching serving wiring. Fixes #951
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- Widen the standalone mtp_decode_layer RoPE parameters to [2, MAX_SEQ_LEN, ROPE_HEAD_DIM] and the rank-level l3_mtp_decode_layer ones to [N_RANKS, 2, MAX_SEQ_LEN, ROPE_HEAD_DIM]. - Slice profile 0, the SWA/base table the MTP draft layer needs, and reshape it back to [MAX_SEQ_LEN, ROPE_HEAD_DIM] before calling mtp_decode_layer_inline, so the fused K=1 inline ABI stays two-dimensional and unchanged. - Build both tables in the standalone fixture, the SWA/base profile from the existing swa_specs entries and the compressed YaRN profile from build_rope_tables(M, 4), then stack them and replicate the pair across ranks. - Read profile 0 in golden_mtp_decode_layer so the golden attention path matches the device implementation. The standalone MTP decode entry still declared a single profile after the main prefill and decode path moved to the stacked dual-profile contract in #953. That stale boundary is reached once the arbitrary-draft-depth scheduler in hw-native-sys/pypto-serving#120 selects standalone decode layouts — B4S4 for K=3, B2S8 for K=9 — which then pass the serving dual-profile tensors into a rank-3 parameter and fail on shape. No attention, projection, sampling, cache, or acceptance math changes here; hw-native-sys/pypto-serving#156 supplies the host-side profile construction and should pin this commit when it updates its pypto-lib submodule.
- Build and pack separate SWA and compressed YaRN RoPE tables - Size shared and resident buffers with the profile dimension - Cover profile construction and prefill staging shapes in unit tests - Pin pypto-lib to the standalone dual-RoPE MTP fix from PR961
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Fixes [Bug] DeepSeek V4 MTP generation becomes corrupted after 89 output tokens #131
related: Fix: correct DeepSeek V4 long-decode RoPE, split-K, and MoE ordering pypto-lib#953