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?)
(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 |
| 3.19% | 7.64% | The CAPIO 2017 Conversational Speech Recognition System | April 2018 | TDNN + TDNN-LSTM + CNN-bLSTM + Dense TDNN-LSTM across two kinds of trees |
| 3.80% | 8.76% | Semi-Orthogonal Low-Rank Matrix Factorization for Deep Neural Networks | Interspeech, Sept 2018 | Kaldi recipe, 17-layer TDNN-F + iVectors |
| 3.44% | 11.24% | Fully Convolutional Speech Recognition | December 2018 | End-to-end CNN on the waveform + conv LM |
| 3.82% | 12.76% | Improved training of end-to-end attention models for speech recognition | Interspeech, Sept 2018 | encoder-attention-decoder end-to-end model |
| 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/ 100M parameters trained on 11940h |
| 5.51% | 13.97% | LibriSpeech: an ASR Corpus Based on Public Domain Audio Books | 2015 | HMM-DNN + pNorm* |
| 4.8% | 14.5% | Letter-Based Speech Recognition with Gated ConvNets | December 2017 | (Gated) ConvNet for AM going to letters + 4-gram LM |
| 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 | |
| 3.5% | 6.8% | Fully Convolutional Speech Recognition | December 2018 | End-to-end CNN on the waveform + conv LM |
| 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/ 100M parameters |
| 5.6% | Convolutional Neural Networks-based Continuous Speech Recognition using Raw Speech Signal | 2014 | CNN over RAW speech (wav) | |
| 5.7% | 8.7% | End-to-end Speech Recognition from the Raw Waveform | June 2018 | End-to-end CNN on the waveform |
(Possibly trained on more data than SWB, but test set = full Hub5'00.)
| WER (SWB) | WER (CH) | Paper | Published | Notes |
|---|---|---|---|---|
| 5.0% | 9.1% | The CAPIO 2017 Conversational Speech Recognition System | December 2017 | 2 Dense LSTMs + 3 CNN-bLSTMs across 3 phonesets from previous Capio paper & AM adaptation using parameter averaging (5.6% SWB / 10.5% CH single systems) |
| 5.1% | 9.9% | Language Modeling with Highway LSTM | September 2017 | HW-LSTM LM trained with Switchboard+Fisher+Gigaword+Broadcast News+Conversations, AM from previous IBM paper |
| 5.1% | The Microsoft 2017 Conversational Speech Recognition System | August 2017 | ~2016 system + character-based dialog session aware (turns of speech) LSTM LM | |
| 5.3% | 10.1% | Deep Learning-based Telephony Speech Recognition in the Wild | August 2017 | Ensemble of 3 CNN-bLSTM (5.7% SWB / 11.3% CH single systems) |
| 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 | |
| 11.8% | 25.7% | Improved training of end-to-end attention models for speech recognition | Interspeech, Sept 2018 | encoder-attention-decoder end-to-end model, trained on 300h SWB |
| WER RT-02 | WER RT-03 | WER RT-04 | Paper | Published | Notes |
|---|---|---|---|---|---|
| 8.1% | 8.0% | The CAPIO 2017 Conversational Speech Recognition System | April 2018 | 2 Dense LSTMs + 3 CNN-bLSTMs across 3 phonesets from previous Capio paper & AM adaptation using parameter averaging | |
| 8.2% | 8.1% | 7.7% | Language Modeling with Highway LSTM | September 2017 | HW-LSTM LM trained with Switchboard+Fisher+Gigaword+Broadcast News+Conversations, AM from previous IBM paper |
| 8.3% | 8.0% | 7.7% | 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 |
| 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 |
| WER Test | Paper | Published | Notes |
|---|---|---|---|
| 6.5% | The CAPIO 2017 Conversational Speech Recognition System | April 2018 | TDNN + TDNN-LSTM + CNN-bLSTM + Dense TDNN-LSTM across two kinds of trees |
| 11.2% | Purely sequence-trained neural networks for ASR based on lattice-free MMI | September 2016 | HMM-TDNN trained with LF-MMI + data augmentation (speed perturbation) + iVectors + 3 regularizations |
| 15.3% | TED-LIUM: an Automatic Speech Recognition dedicated corpus | May 2014 | Multi-layer perceptron (MLP) with bottle-neck feature extraction |
| 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 |
| 16.5% | A Regularization Post Layer: An Additional Way how to Make Deep Neural Networks Robust | 2017 | DBN with last layer regularization |
| 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/ RNN transducer (18.4% with CTC only) |
| 18.0% | Learning Filterbanks from Raw Speech for Phone Recognition | October 2017 | Complex ConvNets on raw speech w/ mel-fbanks init |
| 18.8% | Wavenet: A Generative Model For Raw Audio | September 2016 | Wavenet architecture with mean pooling layer after residual block + few non-causal conv layers |
| 23% | Deep Belief Networks for Phone Recognition | 2009 | (first, modern) HMM-DBN |
TODO
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- 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)
- TDNN-F: a factored form of time delay neural networks (TDNN)
- 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