Qwen3-0.6B-diffusion-bd3lm-ONNX (block diffusion, fused fp16, for the browser)

ONNX export of dllm-hub/Qwen3-0.6B-diffusion-bd3lm-v0.1 — BD3LM, a block-diffusion language model — packaged to run client-side in a web browser on WebGPU via onnxruntime-web, driven by the kohra denoising loop (kohra.js).

Block diffusion sits between autoregressive and fully-masked (MDLM) generation: the sequence is split into blocks of 32 tokens with a block-causal attention pattern — a block attends bidirectionally within itself and causally to all earlier blocks — and is denoised block-by-block, left to right. Same Tiny-A2D Qwen3-0.6B architecture as the MDLM sibling, but a separately-trained checkpoint with stronger reasoning: GSM8K 46.3 vs 29.3, HumanEval 46.3 vs 30.5.

Use it

Same kohra.js loader as the MDLM repo — block diffusion is one extra generate flag, blockCausal: true (the graph takes a 2nd input, a block-causal attention mask, built for you):

import { pipeline } from './kohra.js';

const generate = await pipeline('text-diffusion', {
  model: 'https://huggingface.co/naklitechie/Qwen3-0.6B-diffusion-bd3lm-ONNX/resolve/main/onnx/model_fp16_fused.onnx',
  tokenizer: 'naklitechie/Qwen3-0.6B-diffusion-bd3lm-ONNX',
});

const { text } = await generate('Lily runs 12 km/h for 4 hours. How far in 8 hours?', { blockCausal: true });
console.log(text);   // -> "...48 * 2 = 96 km. Thus, Lily runs \boxed{96} km in 8 hours."

Requires a WebGPU browser (Chrome/Edge 121+) over https or localhost. ~1.5 GB download (fp16, cached after first load); ~2.8 tok/s on an M-series Mac at 128 denoise steps.

Files

• onnx/model_fp16_fused.onnx (+ .onnx.data) — 2-input graph: input_ids and a [1,1,T,T] additive block-causal attention_mask (0 = attend, -1e9 = block, on the pos // 32 grid). RMSNorm is fused to SimplifiedLayerNormalization (the WebGPU fp16 fix); attention stays decomposed so the 4D mask is honored.
• onnx/model_q4f16_rtn_sym.onnx (+ .onnx.data) — 4-bit (RTN, symmetric) q4f16, ~680 MB. Coherent on WebGPU; fp16 stays the default at 0.6B (q4's dequant overhead and a small quality dip aren't worth it until the model is too big for fp16).
• Tokenizer files (Qwen3 ChatML).

Notes

• No KV cache — one full forward per denoise step over the whole canvas. Block-causality is what makes the cache-free forward correct: a still-masked future block can't influence an earlier one, so the current block's logits are right regardless of what's downstream.
• The loop relies on the model's default arange positions (the graph has no position_ids input), so the prompt sits at [0,P) with no padding and the first generated tokens complete the prompt's last partial block — exactly the configuration the ONNX-vs-torch parity verified.

Attribution & license

Derivative of dllm-hub/Qwen3-0.6B-diffusion-bd3lm-v0.1 (built on Qwen/Qwen3-0.6B, Apache-2.0; block-diffusion adaptation by dLLM). See the source repos.