feat(gpt-oss): expert offloading Phase 1 — per-expert identity for packed MXFP4 tensors - #151
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GPT-OSS is excluded from the C++ expert dispatcher and runs a resident
Python expert loop in SyncGptOssMLP.forward, but the loader never
materialized the _PackedExperts params: expert weights stayed zeros,
biases NaN, attention sinks and router garbage, producing incoherent
output. Add _load_resident_gpt_oss to load the real MXFP4 blocks/scales
(uint8, output-major [E,N,K//2]/[E,N,K//32]), biases, router, and
self_attn.sinks into the live params and drop them from name_id_map.
Fix _expert_forward_mxfp4 to feed packed weights without the erroneous
.t() (checkpoint is already output-major; verified rel-err 0.0 vs
reference dequant on gate_up and down proj).
Real 120B: base output now coherent ('The capital of France is Paris.');
DFlash agreement 0.95->1.00, mean acceptance 1.0->6.57, ~21x decode
speedup. 103 dflash tests pass.
Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent) Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>
Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent) Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>
Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent) Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>
Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent) Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>
added 2 commits
August 14, 2026 19:43
…hase1 # Conflicts: # moe_infinity/runtime/model_offload.py
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Implements Phase 1 of RFC #137 (gpt-oss expert offloading). Stacked on #136 (resident-correctness prerequisite).
Changes:
parse_expert_id(hf_config.py) now yields(layer_id, expert_idx)for gpt_oss packed keys[E,...]tensors into 128 per-expert contiguous views/layer (no copy) and populatesexpert_tensor_map; drops themodel_type != "gpt_oss"exclusion_load_resident_gpt_oss) unchanged; dispatch wiring is Phase 3Tests: new
tests/test_gpt_oss_offload_topology.py— Phase 1 suite 14 passed, ruff + LSP clean.Part of plan
docs/superpowers/plans/2026-08-14-gpt-oss-expert-offloading.md. Phase 2 (MXFP4 dequant-on-copy) in progress on a stacked branch.