WER are we? An attempt at tracking states of the art(s) and recent results on speech recognition. Feel free to correct! (Inspired by Are we there yet?)
To be updated with Interspeech 2015...
(Possibly trained on more data than LibriSpeech.)
| WER test-clean | WER test-other | Paper | Published | Notes |
|---|---|---|---|---|
| 5.83% | 12.69 | Deep Speech 2: End-to-End Speech Recognition in English and Mandarin | December 2015 | Humans |
| 4.28% | Purely sequence-trained neural networks for ASR based on lattice-free MMI | September 2016 | HMM-TDNN trained with MMI + data augmentation (speed) + iVectors + 3 regularizations | |
| 4.83% | A time delay neural network architecture for efficient modeling of long temporal contexts | 2015 | HMM-TDNN + iVectors | |
| 5.33% | 13.25% | Deep Speech 2: End-to-End Speech Recognition in English and Mandarin | December 2015 | 9-layer model w/ 2 layers of 2D-invariant convolution & 7 recurrent layers, w/ 68M parameters trained on 11940h |
| 5.51% | 13.97% | LibriSpeech: an ASR Corpus Based on Public Domain Audio Books | 2015 | HMM-DNN + pNorm* |
| 8.01% | 22.49% | same, Kaldi | 2015 | HMM-(SAT)GMM |
| 12.51% | Audio Augmentation for Speech Recognition | 2015 | TDNN + pNorm + speed up/down speech |
(Possibly trained on more data than WSJ.)
| WER eval'92 | WER eval'93 | Paper | Published | Notes |
|---|---|---|---|---|
| 3.47% | Deep Recurrent Neural Networks for Acoustic Modelling | April 2015 | TC-DNN-BLSTM-DNN | |
| 5.03% | 8.08% | Deep Speech 2: End-to-End Speech Recognition in English and Mandarin | December 2015 | Humans |
| 3.63% | 5.66% | LibriSpeech: an ASR Corpus Based on Public Domain Audio Books | 2015 | test-set on open vocabulary (i.e. harder), model = HMM-DNN + pNorm* |
| 3.60% | 4.98% | Deep Speech 2: End-to-End Speech Recognition in English and Mandarin | December 2015 | 9-layer model w/ 2 layers of 2D-invariant convolution & 7 recurrent layers, w/ 68M parameters |
| 5.6% | Convolutional Neural Networks-based Continuous Speech Recognition using Raw Speech Signal | 2014 | CNN over RAW speech (wav) |
(Possibly trained on more data than SWB, but test set = full Hub5'00.)
| WER (SWB) | WER (full=SWB+CH) | Paper | Published | Notes |
|---|---|---|---|---|
| 5.1% | The Microsoft 2017 Conversational Speech Recognition System | August 2017 | ~2016 system + character-based dialog session aware (turns of speech) LSTM LM | |
| 5.5% | 10.3% | English Conversational Telephone Speech Recognition by Humans and Machines | March 2017 | ResNet + BiLSTMs acoustic model, with 40d FMLLR + i-Vector inputs, trained on SWB+Fisher+CH, n-gram + model-M + LSTM + Strided (à trous) convs-based LM trained on Switchboard+Fisher+Gigaword+Broadcast |
| 6.3% | 11.9% | The Microsoft 2016 Conversational Speech Recognition System | September 2016 | VGG/Resnet/LACE/BiLSTM acoustic model trained on SWB+Fisher+CH, N-gram + RNNLM language model trained on Switchboard+Fisher+Gigaword+Broadcast |
| 6.6% | 12.2% | The IBM 2016 English Conversational Telephone Speech Recognition System | June 2016 | RNN + VGG + LSTM acoustic model trained on SWB+Fisher+CH, N-gram + "model M" + NNLM language model |
| 8.5% | 13% | Purely sequence-trained neural networks for ASR based on lattice-free MMI | September 2016 | HMM-BLSTM trained with MMI + data augmentation (speed) + iVectors + 3 regularizations + Fisher |
| 9.2% | 13.3% | Purely sequence-trained neural networks for ASR based on lattice-free MMI | September 2016 | HMM-TDNN trained with MMI + data augmentation (speed) + iVectors + 3 regularizations + Fisher (10% / 15.1% respectively trained on SWBD only) |
| 12.6% | 16% | Deep Speech: Scaling up end-to-end speech recognition | December 2014 | CNN + Bi-RNN + CTC (speech to letters), 25.9% WER if trained only on SWB |
| 11% | 17.1% | A time delay neural network architecture for efficient modeling of long temporal contexts | 2015 | HMM-TDNN + iVectors |
| 12.6% | 18.4% | Sequence-discriminative training of deep neural networks | 2013 | HMM-DNN +sMBR |
| 12.9% | 19.3% | Audio Augmentation for Speech Recognition | 2015 | HMM-TDNN + pNorm + speed up/down speech |
| 15% | 19.1% | Building DNN Acoustic Models for Large Vocabulary Speech Recognition | June 2014 | DNN + Dropout |
| 10.4% | Joint Training of Convolutional and Non-Convolutional Neural Networks | 2014 | CNN on MFSC/fbanks + 1 non-conv layer for FMLLR/I-Vectors concatenated in a DNN | |
| 11.5% | Deep Convolutional Neural Networks for LVCSR | 2013 | CNN | |
| 12.2% | Very Deep Multilingual Convolutional Neural Networks for LVCSR | September 2015 | Deep CNN (10 conv, 4 FC layers), multi-scale feature maps |
(RT03S FSH)
| WER | Paper | Published | Notes |
|---|---|---|---|
| 9.6% | Purely sequence-trained neural networks for ASR based on lattice-free MMI | September 2016 | HMM-BLSTM trained with MMI + data augmentation (speed) + iVectors + 3 regularizations + SWBD |
| 9.8% | Purely sequence-trained neural networks for ASR based on lattice-free MMI | September 2016 | HMM-TDNN trained with MMI + data augmentation (speed) + iVectors + 3 regularizations + SWBD |
| clean | real | sim | Paper | Published | Notes |
|---|---|---|---|---|---|
| 3.34% | 21.79% | 45.05% | Deep Speech 2: End-to-End Speech Recognition in English and Mandarin | December 2015 | 9-layer model w/ 2 layers of 2D-invariant convolution & 7 recurrent layers, w/ 68M parameters |
| 6.30% | 67.94% | 80.27% | Deep Speech: Scaling up end-to-end speech recognition | December, 2014 | CNN + Bi-RNN + CTC (speech to letters) |
TODO
(So far, all results trained on TIMIT and tested on the standard test set.)
| PER | Paper | Published | Notes |
|---|---|---|---|
| 16.5% | Phone recognition with hierarchical convolutional deep maxout networks | September 2015 | Hierarchical maxout CNN + Dropout |
| 16.7% | Combining Time- and Frequency-Domain Convolution in Convolutional Neural Network-Based Phone Recognition | 2014 | CNN in time and frequency + dropout, 17.6% w/o dropout |
| 17.3% | Segmental Recurrent Neural Networks for End-to-end Speech Recognition | March 2016 | RNN-CRF on 24(x3) MFSC |
| 17.6% | Attention-Based Models for Speech Recognition | June 2015 | Bi-RNN + Attention |
| 17.7% | Speech Recognition with Deep Recurrent Neural Networks | March 2013 | Bi-LSTM + skip connections w/ CTC |
| 23% | Deep Belief Networks for Phone Recognition | 2009 | (first, modern) HMM-DBN |
TODO
TODO
TODO?
- WER: word error rate
- PER: phone error rate
- LM: language model
- HMM: hidden markov model
- GMM: Gaussian mixture model
- DNN: deep neural network
- CNN: convolutional neural network
- DBN: deep belief network (RBM-based DNN)
- RNN: recurrent neural network
- LSTM: long short-term memory
- CTC: connectionist temporal classification
- MMI: maximum mutual information (MMI),
- MPE: minimum phone error
- sMBR: state-level minimum Bayes risk
- SAT: speaker adaptive training
- MLLR: maximum likelihood linear regression
- LDA: (in this context) linear discriminant analysis
- MFCC: Mel frequency cepstral coefficients
- FB/FBANKS/MFSC: Mel frequency spectral coefficients
- VGG: very deep convolutional neural networks from Visual Graphics Group, VGG is an architecture of 2 {3x3 convolutions} followed by 1 pooling, repeated