linkseg-7c-onnx

LinkSeg 7-class — ONNX (onnxruntime-web)

An onnxruntime-web-friendly port of the pretrained LinkSeg 7-class music-structure / section-labeling model, for running music structure analysis entirely in the browser (WebGPU-primary, WASM fallback).

• npm package (recommended): linkseg-web — LinkSeg.load() fetches this file (OPFS-cached) and runs the full pipeline.
• Source / demo: https://github.com/elicwhite/LinkSeg-web

Attribution & license (CC-BY 4.0)

This model — architecture and learned weights — is the work of the LinkSeg authors and is licensed Creative Commons Attribution 4.0 International (CC-BY 4.0). If you use or redistribute it you must preserve this attribution:

M. Buisson, B. McFee, S. Essid — Using Pairwise Link Prediction and Graph Attention Networks for Music Structure Analysis, ISMIR 2024.

• Upstream project: https://github.com/morgan76/LinkSeg
• License: https://creativecommons.org/licenses/by/4.0/

The ONNX port (DGL graph ops rewritten as dense-tensor equivalents; mel front-end, cdist, GroupNorm, EMA adaptive-pool and batch-stat BatchNorm decomposed to ONNX-standard ops) does not modify the learned parameters and was validated byte-exact against the original PyTorch/DGL model. The port/glue code (the linkseg-web package) is MIT; the model weights remain CC-BY 4.0.

What it is

• Format: ONNX, opset 17, dynamic batch axis N. ~1.5 MB.
• Input mel: float32 (N, 1, 64, 64) — per-beat log-mel windows. torchaudio MelSpectrogram(sr=22050, n_fft=1024, hop=256, n_mels=64, f_min=0, f_max=11025, power=2) + AmplitudeToDB(power), computed on the client (STFT stays out of the graph). N = number of (requantized) beats; needs ≥ 4.
• Outputs:
  • bound (N-1,) — per-adjacent-beat boundary activations (sigmoid).
  • label (N, 7) — class logits over {silence, verse, chorus, intro, outro, inst, bridge}.
  • apred (N, N, 3) — pairwise link logits (not used by the default decoder).
• Decoding (peak-pick boundaries + majority-vote labels) runs in JS.

It runs on the full mix — no source separation needed — plus beat times from any beat tracker (LinkSeg is robust to the beat source).

Usage

import {LinkSeg} from 'linkseg-web';

const model = await LinkSeg.load(); // downloads this ONNX, caches in OPFS; WebGPU→WASM
const sections = await model.analyze({
  audio,        // Float32Array, mono (resampled to 22050 internally if needed)
  sampleRate,   // e.g. 44100
  beats,        // number[] beat times in seconds (your beat tracker)
});
// → [{ start, end, label }, ...]

WebGPU computes this model in fp32 and tracks the PyTorch reference tightly; WebGPU and WASM decode identically, so auto-fallback to WASM is safe.