Implementation:Facebookresearch Audiocraft RelativeVolumeMel

Knowledge Sources	Facebookresearch_Audiocraft Multi-Band Diffusion
Domains	Audio_Metrics, Diffusion
Last Updated	2026-02-14 01:00 GMT

Overview

Concrete tool for measuring the relative volume of distortion at the mel-spectrogram level between generated and reference audio in decibels.

Description

RelativeVolumeMel computes the RVM metric from the Multi-Band Diffusion paper. It normalizes both signals by the ground truth RMS, computes mel spectrograms, measures the delta in dB, and aggregates into overall and per-band scores. Negative values indicate lower distortion.

Usage

Import this metric when evaluating diffusion-based audio generation or enhancement quality.

Code Reference

Source Location

• Repository: Facebookresearch_Audiocraft
• File: audiocraft/metrics/rvm.py
• Lines: 1-110

Signature

class RelativeVolumeMel(nn.Module):
    def __init__(self, sample_rate=24000, n_mels=80, n_fft=512, hop_length=128, ...): ...
    def forward(self, estimate: torch.Tensor, ground_truth: torch.Tensor) -> tp.Dict[str, torch.Tensor]: ...

Import

from audiocraft.metrics.rvm import RelativeVolumeMel

I/O Contract

Inputs

Name	Type	Required	Description
estimate	torch.Tensor	Yes	Generated audio [B, C, T]
ground_truth	torch.Tensor	Yes	Reference audio [B, C, T]

Outputs

Name	Type	Description
metrics	Dict[str, torch.Tensor]	Dict with "rvm" (overall) and "rvm_0"..."rvm_3" (per band)

Related Pages

• Principle:Facebookresearch_Audiocraft_Compression_Quality_Evaluation