melmass/audiosr-basic

AudioSR basic, trimmed

The released AudioSR basic checkpoint, cut down to what super-resolution runs and saved as safetensors. It is used by IntelligenceKit's MLXAudioSR (Swift, MLX) and by afm upscale.

basic.safetensors, 2.69 GB, float32, with PyTorch names and layouts. It holds:

• model.: the diffusion UNet
• first_stage_model.: the VAE and its 48 kHz HiFi-GAN vocoder
• the scale factor and the noise schedule's buffers

These are left out:

• CLAP, which super-resolution doesn't use;
• the EMA copy of the UNet, since inference uses the live weights;
• the condition encoder's VAE, which is identical to first_stage_model.

The MLX port casts to float16 at load time.

convert.py, the script that made the file:

python convert.py basic basic.safetensors

Parity

The MLX port matches PyTorch stage by stage, from 76 to 137 dB SNR. It was tested on a clip low-passed at 6 kHz and scored by LSD against the original (lower is better):

	LSD
input	3.88
PyTorch	1.16
MLX	1.14