DeepSeek V4.1 Flash for the Lucebox engine (ROCMFP block formats)

Lucebox builds of DeepSeek V4.1 Flash for the Lucebox DS4.1 engine (AMD R9700 + Strix Halo). Routed experts in the engine's ROCMFP block formats; attention, shared experts and head in Q8_0; both Engram tables embedded. Calibrated with the published 262,144-token imatrix (smalinin/DeepSeek-V4.1-Flash-GGUF, converted in imatrix/).

Formats: Q2_0_ROCMFP2 (ggml type 107, 10 bytes per 32 weights, 2.5 bits, codebook {-1, 0, 1, 2} x a ue4m3 scale per 16 weights), Q3_0_ROCMFPX (type 104, 14 bytes per 32, 3.5 bits). fp2s files use type 107 with bit 7 of a half-block's scale byte meaning "mirror the codebook"; a reader that ignores that bit produces garbage, so use an engine build that honors it. KL is measured on 8,184 held-out fineweb-edu tokens against the unquantized model through the same reference forward pass (eval/ holds the teacher log-probs and the tokens). Recipe, converter patches and harness: Lucebox repo, lucebox_training/quantization.

Image input

DeepSeek-V4.1-Flash-mmproj-BF16.gguf (0.90 GiB): this checkpoint's vision encoder (32-layer ViT and the aligner into the 5120-wide model), its 266 tensors copied byte for byte in BF16 by the engine's server/tools/export_ds4v_mmproj.py, with the checkpoint revision recorded (sha256 in vision/). Pass it with --mmproj to an engine build with V4.1 image input, next to these September files only: the October 17 checkpoint retrained its encoder and ships its own in Lucebox/DeepSeek-V4.1-Flash-1017-ROCMFP-GGUF. The engine refuses an encoder from another checkpoint than the target's.

IQ2 / IQ3 + MXFP8 builds

ds41-lucebox-final.gguf (recommended) and ds41-lucebox-minus10gib.gguf (10 GiB smaller): routed experts in IQ2_XXS / IQ3_XXS, dense projections in MXFP8 (type 117, needs an engine with MXFP8, see Luce-Org/lucebox#800). Correct answers on our internal hard bench; exact = plain greedy, no drafter.