Pulled orcarouter/Qwen3.8-27B-Uncensored at rev 9878936b (55.5 GB, gated, our
token has access) and built /tank/aimodels/qwen38-27b-orcarouter-nvfp4-mixed
(23.4 GB, mixed NVFP4+FP8). Verified, not yet cut over.
The operator asked whether we could apply the Robinson path to the MTP head. We
cannot, because the author already did. compare_mtp_head.py against the verbatim
base graft: 13 of 15 tensors byte-identical, exactly 2 differ --
mtp.layers.0.self_attn.o_proj.weight and mtp.layers.0.mlp.down_proj.weight, which
are precisely the two residual writers our own abliterate.py targets
(EXPECT_MTP_WRITERS = 2).
Reverse-engineered the edit from the weights alone (mtp_delta.py, added here):
sigma2/sigma1 = 0.0164 on BOTH tensors rank-1, a single-direction projection
|cos| between the two recovered dirs = 1.0000 ONE shared direction
||delta||/||W|| = 1.42% and 1.41% a gentle, consistent projection
sink energy dim 3994 = 0.0000% sink-clean; Heretic's was 6.18%
That is the Robinson in-band MTP abliteration, already applied, with a direction
that passes our sink screen outright. Nothing to do but preserve it, and the quant
carries it byte-identically. This is the configuration the entire Cold-Fusion
experiment was designed to test and never cleanly delivered.
The new format screen paid for itself on its first real use: think_prior.py on the
bf16 BEFORE any GPU time gave P(<think>) = 1.23e-06 at rank 52, against
Cold-Fusion stock 0.1850 and h300 0.2216. Roughly 150,000x cleaner.
Two durable findings about the pipeline itself:
The quant needs ~17 GB, not a whole card. It ran entirely in GPU1's spare 16 GB
with ZERO production seats stopped -- the h300 run's "stop BOTH GPU0 seats" was
never necessary, it simply had a free card by coincidence. The first attempt OOM'd
by 2.37 GiB at layer 64 of 65 with 3.57 GiB reserved-but-unallocated, which is
fragmentation, and PYTORCH_CUDA_ALLOC_CONF=expandable_segments:True closed it.
post_quant.py now builds a missing output index from the safetensors headers.
A sub-23 GB quant saves one bare shard with no index, and post_quant needs one;
this has broken three separate rounds and been hand-fixed every time. The header
is read by struct-unpacking the u64 length and parsing the JSON -- never
safe_open, which mmaps the whole 22 GB shard and ENOMEMs on ZFS.
Artifact verified: mixed-precision, 1968 tensors, 15 mtp, 333 visual, re:^mtp.*
present in the ignore list (llm-compressor pruned it as always), preproc restored.
Imatrix deferred per operator; the log confirms the usual uniform-MSE fallback, so
this build stays apples-to-apples with heresy's PPL 6.910.
