RE-USE GGUF
GGUF weights for native inference with audio.cpp. RE-USE restores degraded speech while preserving its input sample rate. It uses a convolutional encoder/decoder and 30 bidirectional time-frequency Mamba blocks.
Upstream
The checkpoint and reference implementation are pinned to nvidia/RE-USE, revision 022e920d727347a64d6c21fbf0628f2a5f37ad78. Each GGUF includes the model weights, configuration, and audio.cpp model spec. No separate encoder or tokenizer is required. Packages are converted directly from the original safetensors, not from another GGUF.
Packages
| File | Size | Storage | Recommendation |
|---|---|---|---|
reuse-f32.gguf | 37.80 MiB | F32 | Default; fastest of the tested C++ formats. |
Only F32 is provided. F16 and Q8 were rejected because their small disk savings did not improve speed or peak VRAM in testing, while introducing waveform drift and additional packaging complexity.
F32 was checked on CUDA and Vulkan. Metal, and HIP were not validated in this comparison.
Controlled Parity With Python
These are separate accuracy runs, not the performance runs below. Both implementations used original F32 weights with TF32 disabled. Comparisons cover the final waveform, with no time alignment or normalization applied.
| Input | Rate / channels | C++ vs Python cosine | Relative RMSE |
|---|---|---|---|
Official noisy_audio/mic_test2.wav, 5.10 s | 44.1 kHz / mono | 0.99999846 | 0.001756 |
sample_16k.wav, 14.07 s | 16 kHz / mono | 0.999999995 | 0.0000972 |
c.wav, 7.53 s | 24 kHz / stereo | 0.99964691 | 0.026572 |
The last two inputs are in audio.cpp's audio fixtures. The outputs are not bit-identical to Python; the stereo example has noticeably larger numerical drift than the mono examples. These checks do not establish identical output on every recording or backend.
Ordinary CUDA Performance
- Remeasured on 2026-09-27 after the scoped SSM-convolution optimization.
- NVIDIA RTX 5090, 8 CPU threads, audio.cpp Debug build, PyTorch 2.11.0+cu128.
- Original F32 checkpoint for Python. Normal inference defaults, no TF32 overrides or precision overrides. Logging enabled for C++.
- Five sequential requests in one loaded session. Time is the median of the last three; model loading and WAV file I/O are excluded. C++ includes its host STFT/ISTFT, and Python includes its GPU STFT/ISTFT.
- Peak VRAM is process memory sampled with
nvidia-smievery 50 ms across loading and all five requests, not PyTorch allocator-only memory. - RTF is inference time divided by input duration; lower is faster.
| 5.10-second official microphone clip | Inference time | RTF | Peak VRAM |
|---|---|---|---|
| Python F32 | 273.58 ms | 0.0536 | 5,604 MiB |
| C++ F32 | 277.47 ms | 0.0544 | 3,012 MiB |
C++ F32 has similar latency to Python while using less peak VRAM in this measurement. These results do not establish the same trade-off for every input or backend.
Long Recordings
The 327.6-second qwen3_tts_longform_asr_input.wav fixture uses 10-second
chunks with 1-second overlap in both implementations. Same measurement
method as above. This is chunked processing, not full-recording parity.
| Path | Inference time | RTF | Peak VRAM |
|---|---|---|---|
| Python F32 | 9.839 s | 0.0300 | 5,074 MiB |
| C++ F32 | 10.555 s | 0.0322 | 3,008 MiB |
Usage
audiocpp_cli --task s2s --family reuse \
--model /path/to/RE-USE-GGUF/reuse-f32.gguf --backend cuda \
--audio input.wav --out restored.wav --log
Input audio must be 8-48 kHz and longer than 20 ms. Output retains the input sample rate, channels, and length. Channels are processed independently.
For long recordings, optional overlapping chunks bound graph workspace:
--request-option audio_chunk_duration_sec=10 \
--request-option audio_chunk_overlap_sec=1
Chunking changes bidirectional and normalization context and can change output quality. It is not equivalent to full-recording inference. Input and output audio still occupy host memory proportional to recording length.
See the model usage guide for options and batching.
License
The weights retain the NVIDIA One-Way Noncommercial License (NSCLv1) specified by the upstream model card. Conversion does not replace those terms.