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Contrastive-Predictive-Coding-PyTorch

This repository contains (PyTorch) code to reproduce the core results for:

If you find the code useful, please cite

@article{lai2019contrastive,
  title={Contrastive Predictive Coding Based Feature for Automatic Speaker Verification},
  author={Lai, Cheng-I},
  journal={arXiv preprint arXiv:1904.01575},
  year={2019}
}

Getting Started

./src/model/model.py contains the CPC models implementation, ./src/main.py is the code for training the CPC models, ./src/spk_class.py trains a NN speaker classifier, ./ivector/ contains the scripts for running an i-vectors speaker verification system.

An example of CPC and speaker classifier training can be found at

./run.sh

CPC Models

CDCK2: base model from the paper 'Representation Learning with Contrastive Predictive Coding'.
CDCK5: CDCK2 with a different decoder.
CDCK6: CDCK2 with a shared encoder and double decoders.

Experimental Results

A. CPC Model Training

CPC model ID number of epoch model size dev NCE loss dev acc.
CDCK2 60 7.42M 1.6427 26.42
CDCK5 60 5.58M 1.7818 22.48
CDCK6 30 7.33M 1.6484 28.24

B. Speaker Verificaiton on LibriSpeech test-clean-100 (Average Pooling)

Note: 1st trial list and 2nd trial list

Feature Feature Dim Summarization LDA Dim 1st EER 2nd EER
MFCC 24 average pooling 24 9.211 13.48
CDCK2 256 average pooling 200 5.887 11.1
CDCK5 40 average pooling 40 7.508 12.25
CDCK6 256 average pooling 200 6.809 12.73

C. CPC applied with PCA

Feature w PCA Original Feature PCA Dim PCA Variance Ratio
CDCK2-36 CDCK2 36 76.76
CDCK2-60 CDCK2 60 87.40
CDCK5-24 CDCK5 24 93.39

D. Speaker Verificaiton on LibriSpeech test-clean-100 (i-vectors)

Feature Feature Dim Summarization 1st EER 2nd EER
MFCC 24 i-vectors 5.518 8.157
CDCK2-60 60 i-vectors 5.351 9.753
CDCK5-24 24 i-vectors 4.911 8.901
CDCK6-60 60 i-vectors 5.228 9.009
MFCC + CDCK2-36 60 i-vectors 3.62 6.898
MFCC + CDCK5-24 48 i-vectors 3.712 6.962
MFCC + CDCK6-36 60 i-vectors 3.691 6.765

E. DET Curves of CPC and MFCC Fusion for i-vectors Speaker Verification

Authors

Cheng-I Lai.

If you encouter any problem, feel free to contact me.