FluidInference / speaker-diarization-coreml

Speaker Diarization CoreML Models

State-of-the-art speaker diarization models optimized for Apple Neural Engine, powering real-time on-device speaker separation with research-competitive performance.

Model Description

This repository contains CoreML-optimized speaker diarization models specifically converted and optimized for Apple devices (macOS 13.0+, iOS 16.0+). These models enable efficient on-device speaker diarization with minimal power consumption while maintaining state-of-the-art accuracy.

Usage

See the SDK for more details https://github.com/FluidInference/FluidAudio

With FluidAudio SDK (Recommended)

Installation Add FluidAudio to your project using Swift Package Manager:

dependencies: [
    .package(url: "https://github.com/FluidInference/FluidAudio.git", from: "0.0.2"),
],

import FluidAudio

Task {
    let diarizer = DiarizerManager()
    try await diarizer.initialize()
    
    let audioSamples: [Float] = // your 16kHz audio
    let result = try await diarizer.performCompleteDiarization(
        audioSamples, 
        sampleRate: 16000
    )
    
    for segment in result.segments {
        print("Speaker \(segment.speakerId): \(segment.startTimeSeconds)s - \(segment.endTimeSeconds)s")
    }
}


### Direct CoreML Usage
``swift
import CoreML

// Load the model
let model = try! SpeakerDiarizationModel(configuration: MLModelConfiguration())

// Prepare input (16kHz audio)
let input = SpeakerDiarizationModelInput(audioSamples: audioArray)

// Run inference
let output = try! model.prediction(input: input)

Acknowledgments

These CoreML models are based on excellent work from:

sherpa-onnx - Foundational diarization algorithms pyannote-audio - State-of-the-art diarization research wespeaker - Speaker embedding techniques

Key Features

• Apple Neural Engine Optimized : Zero performance trade-offs with maximum efficiency
• Real-time Processing : RTF of 0.02x (50x faster than real-time)
• Research-Competitive : DER of 17.7% on AMI benchmark
• Power Efficient : Designed for maximum performance per watt
• Privacy-First : All processing happens on-device

Intended Uses & Limitations

Intended Uses

• Meeting Transcription : Real-time speaker identification in meetings
• Voice Assistants : Multi-speaker conversation understanding
• Media Production : Automated speaker labeling for podcasts/interviews
• Research : Academic research in speaker diarization
• Privacy-Focused Applications : On-device processing without cloud dependencies

Limitations

• Optimized for 16kHz audio input
• Best performance with clear audio (no heavy background noise)
• May struggle with heavily overlapping speech
• Requires Apple devices with CoreML support

Technical Specifications

• Input : 16kHz mono audio
• Output : Speaker segments with timestamps and IDs
• Framework : CoreML (converted from PyTorch)
• Optimization : Apple Neural Engine (ANE) optimized operations
• Precision : FP32 on CPU/GPU, FP16 on ANE

Training Data

These models are converted from open-source variants trained on diverse speaker diarization datasets. The original models were trained on:

• Multi-speaker conversation datasets
• Various acoustic conditions
• Multiple languages and accents

Note: Specific training data details depend on the original open-source model variant.