The published artifact is packaged as a Burn Pack (.bpk) archive. The repository also includes Rust tooling to regenerate the raw export manifest and Burn pack from the upstream checkpoint.

Repository Contents

Published model assets at the repository root:

heartmula.bpk
tokenizer.json
gen_config.json

Conversion and packaging sources included in the repository:

convert.sh: one-step export-and-pack script that writes heartmula.bpk at the repository root
src/bin/export_heartmula_raw.rs: exports the upstream safetensors checkpoint into .npy tensors plus a manifest file
src/main.rs: packs exported tensors into Burn Pack archives
Cargo.toml, Cargo.lock: Rust dependencies for the packer

Included Models

HeartMuLa generator

Transformer-based audio generation model
28 backbone layers and 3 decoder layers
Hidden size: 3072
Intermediate size: 8192
Audio vocabulary: 65,576 tokens

The checked-in manifest at heartmula/manifest.json contains 289 tensors.

File Sizes

Current repository payload:

heartmula.bpk: 15,752,483,328 bytes
tokenizer.json: 9,085,657 bytes
gen_config.json: 101 bytes

Rebuilding the Artifacts

The repository includes the scripts needed to regenerate the Burn artifacts from the original upstream checkpoints.

Prerequisites

A Rust toolchain capable of building the packer in this repository
Local copies of the upstream checkpoint and support files arranged like this:

text

CKPT_ROOT/
├── HeartMuLa-oss-3B/
├── tokenizer.json
└── gen_config.json

The exporter reads the Hugging Face safetensors shards directly from the checkpoint directory and copies tokenizer.json and gen_config.json into the output artifact directory.

One-Step Conversion

./convert.sh CKPT_ROOT

This regenerates heartmula.bpk at the repository root and removes the temporary artifact directory when finished.

Download the Upstream Files

bash

huggingface-cli download HeartMuLa/HeartMuLa-oss-3B --local-dir CKPT_ROOT/HeartMuLa-oss-3B
huggingface-cli download HeartMuLa/HeartMuLa-oss-3B tokenizer.json --local-dir CKPT_ROOT
huggingface-cli download HeartMuLa/HeartMuLa-oss-3B gen_config.json --local-dir CKPT_ROOT

Export Raw Tensors and Manifest

Example:

bash

cargo run --release --bin export_heartmula_raw -- \
  --checkpoint-root CKPT_ROOT \
  --heartmula-subdir HeartMuLa-oss-3B \
  --output-root artifacts/heartmula-oss-3b

This produces:

artifacts/heartmula-oss-3b/heartmula_raw_f32/
artifacts/heartmula-oss-3b/tokenizer.json
artifacts/heartmula-oss-3b/gen_config.json

Each raw directory contains .npy tensor files and a manifest.json.

Pack Burn Archives

The Rust packer reads a manifest and writes a .bpk archive:

bash

cargo run --release --bin heartmula-burn -- \
  --manifest artifacts/heartmula-oss-3b/heartmula_raw_f32/manifest.json \
  --output artifacts/heartmula-oss-3b/heartmula.bpk

Notes

This repository is a model artifact and conversion repo, not a complete inference application.
The generated FP32 manifest references FP32 tensors.
The repository includes the large Burn archives directly, so Git LFS configuration in .gitattributes is part of the expected publishable layout.

License

This conversion is distributed under Apache 2.0, matching the repository metadata.

maolandaw/HeartMuLa-oss-3b-burn

HeartMuLa-oss-3B (Burn Format)

Repository Contents

Included Models

HeartMuLa generator

File Sizes

Rebuilding the Artifacts

Prerequisites

One-Step Conversion

Download the Upstream Files

Export Raw Tensors and Manifest

Pack Burn Archives

Notes

License

maolandaw/
HeartMuLa-oss-3b-burn