Module linear_core 

Linear-attention cores, selected by arch.linear_core.kind (descriptor-driven operators — Patent 15 claim 8).

Two tracks (owner decision 2026-07-04):

• gated_delta_net — the faithful vendor operator (Qwen3.5 / Qwen3-Next). Default for models that ship GDN weights: conversion carries the tensors 1:1 and needs no training. Port of the validated gated_delta_net (vmfcore/rust/src/forward.rs) against the numpy/torch oracle (vmfcore/gdn_layer.py).

• vmf_phase — the canonical core: token carries a phase θ; kernel φ(θ) = [cos θ; sin θ] gives a linear factorization; the condensate is a recurrent state S[head][p2, dv] with decay exp(−exp(A_log)). Noise-robust and simpler than vendor recurrences. Exotic operators are folded onto it at CONVERT time (--linear-core vmf_phase) and quality is restored by the offline heal — the research track and the production mechanism for Patent-15 skills (mask→heal→compress).

Both cores implement the same contract: *_forward (one position, advances the state) and *_pair (fused two positions; lane 1 commits, lane 2 is tentative in scratch for speculative verify). State lives in the layer’s linear_state: Vec<f32> and is resized lazily by the core itself.

Structs

GdnCfg

GdnWeights

Weights of one GatedDeltaNet layer (model.layers.{i}.linear_attn.*, names 1:1 with the source model — no fold, no training).

ShortConvCfg

ShortConvWeights

Weights of one LFM2 short-convolution mixer (model.layers.{i}.short_conv.*, renamed from the vendor conv.* at convert time). No recurrent condensate — the only state is the causal conv ring (the last kernel−1 gated inputs per channel).

VmfPhaseCfg

VmfPhaseWeights

Weights of one vmf_phase layer (model.layers.{i}.vmf_attn.*).

Functions

gdn_forward

Forward one position through a GatedDeltaNet layer, advancing state.

gdn_forward_batch

Batched GDN forward (prefill-GEMM): the qkv/z/a/b and out_proj projections are matmat over the batch (a weight row once per chunk), the gdn_step recurrence runs sequentially over positions (state is the same as the sequential path; the math is elementwise identical).

gdn_pair

Fused two-position forward (speculative verify): lane 1 commits into state, lane 2 is tentative in scratch (ring + S move together).

short_conv_forward

Forward one position through a short-conv layer, advancing state.

short_conv_forward_batch

Batched short-conv forward (prefill-GEMM): in_proj/out_proj are matmat over the chunk (a weight row streamed once), the conv walks the positions in order — the chunk is contiguous, so the ring state is exactly the sequential path’s and the math is elementwise identical.

short_conv_pair

Fused two-position forward (speculative verify). Lane 1 commits into state; lane 2’s tentative ring goes into scratch — swapped in on draft acceptance, dropped on rejection. LFM2 ships no MTP head, so this is exercised only by the pair-fusion micro-benchmark; kept correct.

vmf_phase_forward

Forward one position through a vmf_phase layer, advancing state.

vmf_phase_pair

Fused two-position forward (speculative verify). Lane 1 commits into state (its token is always committed); lane 2’s tentative state goes into scratch — the caller swaps it in on draft acceptance and simply drops it on rejection.