LDLMIn construction

Meshchaninov et al. · May 2026Diffusion language model

Self-attention

Pinned implementation and paper LDLM @ e18c42a, not yet public · arXiv:2605.07933v1 · OpenWebText · 1024 · checkpoint, tokenizer and saved statistics not verified · How to read

Training Generationcall1

1 2 512 1,024

x_attn[B, T, 768]Q, K, V projection

x_{\mathrm{attn}}\,W_{QKV}

Split query heads Split key heads Split value heads Rotary tableR R RoPE RoPE Q[B, 12, T, 64]K[B, 12, T, 64]V[B, 12, T, 64]

Attend Open →

O[B, 12, T, 64]Merge heads Output projection

\Delta_{\mathrm{attn}}=oW_{O}

Δ_attn[B, T, 768]

Sampler › Denoiser › 12 denoiser blocks › Self-attention

Merge heads

no parameters

Concatenate the 12 heads into 768 features.

[B,\,12,\,T,\,64]

\to\;[B,\,T,\,12,\,64]

\to\;[B,\,T,\,768]

in: $O$ [B batch, 12 heads, T positions, 64 head features]
out: $o$ [B batch, T positions, 768 d]

Explanation

Heads are concatenated in order: head $i$ fills features ${64i},\dots,{64i+63}$ .

Sources1

Direct evidence

A block normalizes, modulates by the time condition’s shift and scale, projects to queries, keys and values, rotates queries and keys, attends over all positions with softcap, and adds the projected output scaled by a gate; the MLP branch does the same with its own shift, scale and gate.

The implementation, pinned at revision e18c42acdfb7, not yet public