comparing gru and lstm for automatic speech recognition

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26 de fevereiro de 2017

comparing gru and lstm for automatic speech recognition

1 Introduction. The interest in processing huge amounts of data has experienced a rapid increase during the past decade due to the massive deployment of smart sensors 1 or the social media platforms, 2 which generate data on a continuous basis. Nowadays, natural language processing has developed to a systematic discipline. This approach, combined with a Mel-frequency scaled filterbank and a Discrete Cosine Transform give rise to the Mel-Frequency Cepstral Coefficients (MFCC), which have been the … Essentially, it works by storing a human voice and training an automatic speech recognition system to recognize vocabulary and speech patterns in that voice. 11/05/2017 ∙ by Anuroop Sriram, et al. [11] in 2014. 2. Deploying such bulky model results in high power consumption and leads to high total cost of ownership (TCO) of a data center. J. F. Jones ADAPT Centre, School of Computing, Dublin City University, Dublin 9, Ireland ABSTRACT Transcription of multimedia data sources is often a challeng-ing automatic speech recognition (ASR) task. GRU’s got rid of the cell state and used the hidden state to transfer information. In order to achieve higher prediction accuracy, machine learning scientists have built larger and larger models. He won the Best Regular Paper Award on the APSIPA ASC 2019 … 2.2. We observe that the Transformer training is in general more stable compared to the LSTM, although it also seems to overfit more, and thus shows more problems with generalization. These results suggest that LSTM has a place in domains that require the learning of large timewarped datasets, such as automatic speech recognition. Harry Stuart. On the one hand, acoustic features need to be robust enough to capture the emotional content for various styles of speaking, and while on the other, machine learning algorithms need to be insensitive to outliers while being able to model the context. The automatic recognition of spontaneous emotions from speech is a challenging task. IndexTerms: Speech recognition, accented speech, accent em-bedding, multi-task, end-to-end. ... (Automatic Speech Recognition) ... (CNN) or/and recurrent neural networks (LSTM, GRU) are fed with pieces of spectogram (Input) to determine as output : the letter corresponding to the emitted sound. Recently, recurrent neural networks have become state-of-the-art in acoustic modeling for automatic speech recognition. Hence, a performant speech emotion recognition (SER) system requires a predictive model that is capable of learning sufficiently long temporal dependencies in the analysed speech signal. Large Vocabulary Automatic Speech Recognition. The state-of-the-art CNN based object recognition models are employed to facilitate the facial expression recognition performance. 0. votes. class of RNN, Long Short-Term Memory [LSTM] networks. The acoustic side has three models: one LSTM with multiple feature inputs, a second LSTM trained with speaker-adversarial multitask learning, and a third residual net with 25 convolutional layers. The language model uses character LSTMs and convolutional WaveNet-Style language models. 1 Introduction It would be desirable to retrainan Automatic Speech Recognition(ASR) system onnew data without losingthe benefits ofpreviouslearning.For example,it may The GRU 1 had less calculation than the LSTM 1 but the calculation delay of GRU 1 was higher than that of LSTM 1. In embodiments, the entire pipelines of hand-engineered components are replaced with neural networks, and the end-to-end learning allows handling a diverse variety of speech including noisy environments, accents, and different languages. Both LSTM layers have the same internal architecture described earlier. For this project, three recurrent networks, standard RNN, Long Short-Term Memory [LSTM] networks and Gated Recurrent Unit [GRU] networks are evaluated in order to compare their performance on speech data. For comparison we show recognition ratesofHiddenMarkovModels(HMMs)onthesamecorpus,andprovide a promising extrapolation for HMM-LSTM hybrids. However, alternative units like gated recurrent unit (GRU) and its modifications outperformed LSTM in … Yu Y, Si X, Hu C, Zhang J. Automatic genre classi cation system has been ... {10], speech recognition [11,12], and natural language processing [13,14]. This paper is organized in several parts. As already mentioned, LSTM has many variants, such as LSTM with added peephole connection (Cho et al. 3 However, this situation poses new challenges, such as storing these data in disks or making available the required computational resources. A crucial component of most automatic speech recognition (ASR) systems is the phoneme lexicon, mapping words to their ... e.g. Depth was kept the same for both encoding and decoding layers. In this work, we propose a new dual-level model that combines handcrafted and raw features for audio signals. Deep learning is a class of machine learning algorithms that (pp199–200) uses multiple layers to progressively extract higher-level features from the raw input. It uses gate Zt and gate Rt to update the hidden state. Label is the identifier for the audio file used in the results table, the first two digits are the year of the recording. Fig. We can think of the GRU as an optimization or variation of the LSTM. It also only has two gates, a reset gate and update gate. However, understanding RNN and finding the best practices for RNN learning is a difficult task, partly because there are many competing and complex hidden units, such as the long short-term memory (LSTM) and the gated recurrent unit (GRU). Interspeech, 2020. Natural language understanding (NLU) translates user queries from natural language into a formal semantic representation. nificantly improve recognition rates. ... each with an ... machine-learning neural-networks lstm speech-recognition. Different from prior works, we applied ADMM [27] to train the block circu-lant based RNN models to achieve better accuracy. The current two-step approach [2] for Speech to Named Entity Recognition is using the automated transcript by ASR as input to … A review of recurrent neural networks: LSTM cells and network architectures. I don't quite understand how a recurrent neural network or LSTM is trained for automatic speech transcription. It depends on how much your task is dependent upon long semantics or feature detection. While these recurrent models were 19. In Gers et al. gated recurrent units (GRU) – the "forgetting" and input filters integrate into one "updating" filter (update gate), and the resulting LSTM model is simpler and faster than a standard one. US violent crime and murder down after two years of increases, FBI data shows,24/9/2018, The Guardian. Robust Speech Recognition Using Generative Adversarial Networks. Introduction. The team adapted the speech recognition systems that were so successfully used for the EARS CTS research: Multiple long short-term memory (LSTM) and ResNet acoustic models trained on a range of acoustic features, along with word and character LSTMs and convolutional WaveNet-style language models. As GRU is a more advanced propose using LSTM units in a bidirectional RNN for speech recognition, so we focus on that approach. Figure 3 illustrates the architecture of two Layered Stacked LSTM. The network has slightly worse accuracy compared to the LSTM-based network, but the number of parameters in the GRU is much lower making GRU layer preferable for speech recognition. Kiet Nguyen, Vietnam National University - Ho Chi Minh City, Computer Science Department, Faculty Member. For LSTM, input gate, output gate and forget gate are used to con-trol the information flow. However, the dynamic properties behind the remarkable performance remain unclear in many applications, e.g., automatic speech recognition (ASR). Bidirectional LSTMs are an extension of traditional LSTMs that can improve model performance on sequence classification problems. Studies Natural Language Processing, Parsing, and Text Classification. Sequence classification is a predictive modeling problem where you have some sequence of inputs over space or time and the task is to predict a category for the sequence. In … Connectionist Temporal Classification (CTC), Attention Encoder-Decoder (AED), and RNN Transducer (RNN-T) are the most popular three methods. The GRU is the newer generation of Recurrent Neural networks and is pretty similar to an LSTM. Audiovisual speech recognition is a favorable solution to multimodality human–computer interaction. Recurrent neural networks (RNNs) have shown clear superiority in sequence modeling, particularly the ones with gated units, such as long short-term memory (LSTM) and gated recurrent unit (GRU). Long Short-Term Memory (LSTM) is widely used in speech recognition. The data set used for the experiments is a reduced version of TED-LIUM speech data. Here LSTM greatly outperformed an SNN-like model found in the literature. Recognition on speech data by using Long Short-Term Memory (LSTM). Current techniques focus mainly on neural networks and are therefore sensitive to the generalization potential of the data. The training procedure for LSTMs, esp. 219 1 1 silver badge 6 6 bronze badges. Besides, features within word are also useful to represent word, which can be captured by character LSTM or character CNN structure or human-defined neural features. The performance drops sharply and almost equals torandom guess. Abstract: We present competitive results using a Transformer encoder-decoder-attention model for end-to-end speech recognition needing less training time compared to a similarly performing LSTM model. To identify words under realistic condi-tions, a recogniser must be able to handle large varia-tions in speaker rate, both over whole words and over Human body and limb motion recognition gains an increasingly wide attention in many applications, including assisted living, elderly health care, computer entertainment, search and rescue operation, and security surveillance [1-7].Radar technique is a non-contact sensing method that captures the human body and limb motion patterns with the electromagnetic (EM) wave … Such large model is both computation intensive and memory intensive. This study provides benchmarks for different implementations of long short-term memory (LSTM) units between the deep learning frameworks PyTorch, TensorFlow, Lasagne and Keras.The comparison includes cuDNN LSTMs, fused LSTM variants and less optimized, but more flexible LSTM implementations. Figure 2 shows a basic RNN seq2seq model with a bi-directional LSTM encoder and an LSTM decoder. According to the experiments and their evaluation, LSTM performed best among all other networks with a good word error rate at the same time GRU also achieved results close to those of LSTM … What makes this problem difficult is that the sequences can vary in length, be comprised of a very large vocabulary of input symbols and may require the model to learn the long-term ØThe role of CNN uThe convolution layer of CNNs operates in an sliding window manner acting as a automatic … Automatic Speech Recognition(ASR) and Named Entity Recognition(NER) from text both have been popular deep learning problems and been widely used in different applications. I used roughly the same methodology as before. 2014) and the Gated Recurrent Unit (GRU) (Graves & Jaitly 2014). Each utterance is preprocessed into a handcrafted input and two mel-spectrograms at different time-frequency resolutions. Toronto, M5S 3G4, Canada ABSTRACT Deep Bidirectional LSTM (DBLSTM) recurrent neural net-works have recently been shown to give state-of-the-art per- A bi-direction long short term Memory (Bi-LSTM) is employed to capture dynamic information of the learned features. 1 Introduction Non-linear timewarping is a major challenge to speech recognition. Recurrent neural networks (RNNs) have shown clear superiority in sequence modeling, particularly the ones with gated units, such as long short-term memory (LSTM) and gated recurrent unit (GRU). Convolutional, long short-term memory, fully connected deep neural networks (IEEE , South Brisbane , 2015 ), pp. Section 2 introduces the related work about text classification. Much later, a decade and half after LSTM, Gated Recurrent Unit [GRU] were introduced by Cho et al. Introduction Automatic speech recognition (ASR) is an established research area of speech processing. HYBRID SPEECH RECOGNITION WITH DEEP BIDIRECTIONAL LSTM Alex Graves, Navdeep Jaitly and Abdel-rahman Mohamed University of Toronto Department of Computer Science 6 King’s College Rd. LSTM, GRU and attention neural networks, comparing their performances for ... During that time, other applications like speech recognition has appeared. He is currently working toward a Ph.D. degree with the EE Department, NTHU, Hsinchu, Taiwan. By doing that, it can pass relevant information down the long chain of sequences to make predictions. Almost all state of the art results based on recurrent neural networks are achieved with these two networks. LSTM’s and GRU’s can be found in speech recognition, speech synthesis, and text generation. Both GRU and LSTM can learn long-term dependencies of input data and could be used in time series data prediction that always have a … Embodiments of end-to-end deep learning systems and methods are disclosed to recognize speech of vastly different languages, such as English or Mandarin Chinese. al. ... Automatic Speech recognition (ASR) is the ability of a computer to convert a speech audio signal into its textual transcription. Nevertheless, LSTMs and GRUs fail to demonstrate really long-term memory capabilities or efficient recall on synthetic tasks (see Figure 1). For example, in image processing, lower layers may identify edges, while higher layers may identify the concepts relevant to a human such as digits or letters or faces.. Overview. In embodiments, the entire pipelines of hand-engineered components are replaced with neural networks, and the end-to-end learning allows handling a diverse variety of speech including noisy environments, accents, and different languages. Update gates help capture long-term dependencies in time series, but the experimental results are quite similar: Fig.4. We present real-time speech recognition on smartphones or embedded systems by employing recurrent neural network (RNN) based acoustic models, RNN based language models, and beam-search decoding. We found that a CLDNN acoustic model outperforms an LSTM across a variety of different conditions, but does not specifically model child speech relatively better than adult. Some motivations for building ASR systems are, presented in order of difficulty, to improve human–computer ... LSTM and GRU. The automatic recognition of spontaneous emotions from speech is a challenging task. ∙ 0 ∙ share . We also experimented with the GRU cell instead of the LSTM cell. the chance of producing offensive results. For German, we use 1. This repo contains Torch scripts and models I created when working on my master's thesis Efficient Hardware Mapping of LSTM Neural Networks for Speech Recognition (alternate link), in the ESAT-MICAS lab of KU Leuven, Belgium, from February till July 2016. Plus, the machine learning department of Carnegie Mellon University introduced a generic convolutional architecture, Scene segmentation , speech synthesis , recognition and machine translation are some highlighted tasks achieved with ... LSTM, BiLSTM, and GRU are prominent and powerful RNN models that are efficient for time-dependent in time-series data. The difference lies in the GRU's r and z gates, which make it possible to learn longer-term patterns. DNNs are becoming popular in automatic speech recog- LSTM networks have special memory cell structure, which is intended to hold long-term dependencies in data. for speech recognition. Long Short-Term Memory Neural Networks for Automatic Speech Recognition on the TIMIT dataset. References:. Therefore, in this work, we propose a novel … Comparing a simple recurrent unit with a GRU. LSTM LANGUAGE MODEL ADAPTATION WITH IMAGES AND TITLES FOR MULTIMEDIA AUTOMATIC SPEECH RECOGNITION Yasufumi Moriya, Gareth. ; Greff et al. is Automatic Speech Recognition (ASR), which is a rep-resentative and computation-intensive application of (LSTM and GRU) RNNs and is also the focus of [23]. Recently, several algorithms based on advanced structures of neural networks have been proposed for auto-detecting cardiac arrhythmias, but their performance still needs to be further improved. A different model of Long Short-Term memory (LSTM) is the Gated Recurrent Unit that is a special kind of recurrent neural network. This paper specifically studies the behavior of Long Short-Term Memory (LSTM)-based neural networks on a specific task of automatic speech processing: speech … The resulting GRU model is simpler than standard LSTM models, and has been growing increasingly popular. (3) Compare GRU to long short-term memory (LSTM), a text unit is added to GRU, which effectively controls the content gate rather than completely exposing it without any control on the stream information. As shown in Figure 2, conventional ASR systems uses acoustic and linguistic information preserved in three distinct components to convert speech signals to the corresponding text: (1) an acoustic model for preserving the statistical representations of different speech units, e.g., phones, from speech features, (2) a language model … The first on the input sequence as-is and the second on a reversed copy of the input sequence. Figure 1 shows that when RNN units are fed a long string (e.g., emojis in Figure 1(a)), they struggle to represent the input in their memory, which results in recall or copy mistakes. Amongst the various characteristics of a speech signal, the expression of emotion is one of the characteristics that exhibits the slowest temporal dynamics. Speech Recognition: RNN, LSTM and GRU Apeksha Shewalkar, Deepika Nyavanandi, Simone A. Ludwig Department of Computer Science, North Dakota State University, Fargo, ND, USA January 23, 2019 Abstract Deep Neural Networks (DNN) are nothing but neural networks with many hidden layers. I purchased verbatim transcripts, made and checked by humans, from three services: Rev, Scribie, and Cielo24. Merging the bidirectional RNN with LSTM and GRU was originally designed for problems like text and speech recognition. While these recurrent models were mainly proposed for simple read speech tasks, we experiment on a large vocabulary continuous speech recognition task: transcription of TED talks. JT Geiger , et al, in Proc INTERSPEECH . 631 - 635 15. Subvocal speech recognition via close-talk microphone and surface electromyogram using deep learning: CNN: FedCSIS: 2017: Speech and emotion classification: Deep neural network frontend for continuous emg-based speech recognition: DNN: INTERSPEECH: 2016: Speech … 4580 - 4584 14. In problems where all timesteps of the input sequence are available, Bidirectional LSTMs train two instead of one LSTMs on the input sequence. deep bidirectional LSTMs (BLSTM) takes I Sentiment Analysis. as automatic speech recognition. However, in this application, the network with the LSTM cell outperforms the network with GRU cells. LSTM (or bidirectional LSTM) is a popular deep learning based feature extractor in sequence labeling task. Currently LSTM and GRU networks (variants of RNNs) are used by companies such as Google, Apple, Microsoft, Amazon, Baidu Research Group etc. choice for automatic speech processing. Speech Emotion Recognition (SER) has emerged as a critical component of the next generation of human-machine interfacing technologies. LSTM-RNN DNN Fundamental network blocks J. Li et al., ^On the Comparison of Popular End-to-End Models for Large Scale Speech Recognition, in Proc. Automatic speech recognition (ASR) is a voice processing component which converts spoken language into textual representation. 1 shows a single GRU, whose functionality is derived by using the following equations iteratively from t= 1 to T, where symbols z, r, eh, h are respectively the update gate, output gate, cell state, and cell output. Image to Text Mappings. HIGHWAY LONG SHORT-TERM MEMORY RNNS FOR DISTANT SPEECH RECOGNITION Yu Zhang 1, Guoguo Chen 2, Dong Yu 3, Kaisheng Yao 3, Sanjeev Khudanpur 2, James Glass 1 1 MIT CSAIL 2 JHU CLSP 3 Microsoft Research f yzhang87,glass g @mit.edu, f guoguo,khudanpur g @jhu.edu, f dongyu, Kaisheng.YAO g @microsoft.com To identify words under The incorpo- This paper describes a general, scalable, end-to-end framework that uses the generative adversarial network (GAN) objective to enable robust speech recognition. GRU/CNN-LSTM neural network trained within 1000 frames (10s), it suffers from "the curse of sentence length". In the last few years, an emerging trend in automatic speech recognition research is the study of end-to-end (E2E) systems. Defense Advanced Research Projects Agency (DARPA) Effective Affordable Reusable Speech-to-Text (EARS) program Both are soft switches (value between 0 and 1) computed based on the previous state of the whole layer and the inputs, with a … LSTM’s and GRU’s can be found in speech recognition, speech synthesis, and text generation. You can even use them to generate captions for videos. Ok, so by the end of this post you should have a solid understanding of why LSTM’s and GRU’s are good at processing long sequences. While these recurrent models were mainly proposed for simple read speech tasks, we experiment on a large vocabulary continuous speech recognition task: transcription of TED talks. This paper proposes to compare Gated Recurrent Unit (GRU) and Long Short Term Memory (LSTM) for speech recognition acoustic models. ... to introduce a robust technique for the automatic prognosis of COVID-19 infection. Resetting the gate helps capture short-term dependencies in the time series. Robust speech recognition using long short-term memory recurrent neural networks for hybrid acoustic modelling (ISCA , Singapore, 2014 ), pp. It can be trained similar to a standard RNN; however, it looks slightly different when expanded in time (shown in the graphic below, also from Schuster and Paliwal). a Long-Short Term Memory (LSTM) [20] or a Gated Recurrent Unit (GRU) [21], to counter ... by comparing the model predictions on unseen data to manual entries by expert phoneticians. , readers can find more about these LSTMvariants. Recurrent neural networks (RNN) have been very successful in handling sequence data. Only recently, it has been shown that LSTM based acoustic models (AM) outperform FFNNs on large vocabulary continu-ous speech recognition (LVCSR) [3, 4]. Abstract. For a long time, it has been very difficult to develop machines capable of generating or understanding even fragments of natural languages; the fused sight, smelling, touching, and so on provide machines with possible mediums to perceive and understand. Natural Language Processing tasks for which LSTM can be useful: Question Answering. Automatic-Speech-Recognition. Speech Recognition. Speech Analysis for Automatic Speech Recognition (ASR) systems typically starts with a Short-Time Fourier Transform (STFT) that implies selecting a fixed point in the time-frequency resolution trade-off. long short-term memory (LSTM) networks [2] perform very well when dealing with sequence data like speech. Hi and welcome to an Illustrated Guide to Long Short-Term Memory (LSTM) and Gated Recurrent Units (GRU). Long Short-Term Memory (LSTMs) and the more general deep Recurrent Neural Networks (RNNs), however, are now dominating the area of sequence modeling, setting new benchmarks in machine translation [25, 134], speech recognition , and the closely related task of image captioning [33, 147]. Real-time automatic speech recognition (ASR) on mobile and embedded devices has been of great interests for many years. A Study of Comparing Deep Long Short-Term Memory RNN Models for Speech Recognition Wei-Ning Hsu, Yu Zhang, James Glass Spoken Language Systems Group Computer Science and Artificial Intelligence Laboratory (CSAIL) Massachusetts Institute of … COMPARING GRU AND LSTM FOR AUTOMATIC SPEECH RECOGNITION Shubham Khandelwal Benjamin Lecouteux Laurent Besacier LIG/GETALP, Univ Grenoble Alpes, France ABSTRACT This paper proposes to compare Gated Recurrent Unit (GRU) and Long Short Term Memory (LSTM) for speech recog-nition acoustic models. . Seq2Seq 3 256 LSTM 17.23 Seq2Seq 2 64 GRU 17.09 Seq2Seq 3 128 GRU 16.99 Seq2Seq 2 128 LSTM 16.67 Seq2Seq 2 128 GRU 16.54 Table 1: Performance of different transliteration models. Support TensorFlow r1.0 (2017-02-24); Support dropout for dynamic rnn (2017-03-11); Support running in shell file (2017-03-11); Support evaluation every several training epoches automatically (2017-03-11); Fix bugs for character-level automatic speech recognition … However, the dynamic properties behind the remarkable performance remain unclear in many applications, e.g., automatic speech recognition (ASR). work variants, long short-term memory (LSTM) [7] and gated recurrent unit (GRU) [3] are two related variants which have been successfully used in speech recognition field [1] [8]. GRU is one gate less than LSTM. And CNN can also be used due to faster computation. Embodiments of end-to-end deep learning systems and methods are disclosed to recognize speech of vastly different languages, such as English or Mandarin Chinese. For offline SR, Transformer model shows better accuracy than LSTM, and Conformer further improves its results. RNN architectures, especially long short-term memory (LSTM) and gated recurrent unit (GRU) , have been most widely adopted for seq2seq models. Recently however, researches showed BiRNN also worked well on time series data prediction problems [37-39]. On the one hand, acoustic features need to be robust enough to capture the emotional content for various styles of speaking, and while on the other, machine learning algorithms need to be insensitive to outliers while being able to model the context. Introduction ... GRU-Encoder Speech Embeddings Attention-GRU-Decoder Decoding Results ... Bi-LSTM-RNN FCL Attention Output This page benchmarks the implementation of a real-time speech-to-text solution on a Xilinx edge device using the Vitis accelerated flow. Reported CER is in percentage and was calculated after a 5-fold cross validation. In addition to be simpler compared to LSTM, GRU networks outperform LSTM for all network depths experimented. For this evaluation I picked a number of interviews, spread over a range of years with a mix of accents and audio qualities, and used a 10 minute section of each one. Encoders trained with the proposed approach enjoy improved invariance by learning to map noisy … We propose a gated unit for RNN, named as minimal … Long short-term memory (LSTM) is an artificial recurrent neural network (RNN) architecture used in the field of deep learning.Unlike standard feedforward neural networks, LSTM has feedback connections.It can not only process single data points (such as images), but also entire sequences of data (such as speech or video). 1. Graves et. This representation is then used by the system to select the next action and generate a response. This study … Index Terms: Automatic speech recognition, deep neural net-work, end-to-end, keyword search, low resource language 1. The benchmarks reflect two typical scenarios for automatic speech recognition, … These algorithms can extract high-level features automatically layer by ... As a popular variant of LSTM, GRU is simpler and e ective as well. My research interests are natural language processing and AI. Below I’ve listed some details of the audio files. And therefore, makes them perfect for speech recognition tasks [9]. His research interests are in automatic deception detection and automatic emotion recognition. Neural Comput. The long short-term memory (LSTM) units are the most popular ones. In this article, we’ll look at a couple of papers aimed at solving this problem with machine and deep learning. This paper employs visualization techniques to study the behavior of LSTM and GRU when performing speech recognition … End-to-end automatic speech recognition system implemented in TensorFlow. They can keep and take into account in their decisions past and future contextual information. We also compare long short-term memory (LSTM) recurrent networks to con-volutional, LSTM, deep neural networks (CLDNN). Introduction: Electrocardiograms (ECG) provide information about the electrical activity of the heart, which is useful for diagnosing abnormal cardiac functions such as arrhythmias. Abstract. asked Nov 14 '19 at 8:37. ADMM is a powerful method for solving non-convex optimization KEY WORDS Speech Recognition, LSTM, RNN, SNN, Timewarping 1 Introduction Non-linear timewarping is a major difficulty in speech recognition. Simpler than LSTM, the GRU uses only reset gate and update gate. Sak H, Senior A, Beaufays F. Long short-term memory based recurrent neural network architectures for large vocabulary speech recognition 2014. arXiv preprint arXiv:1402.1128. Recent Updates. 2019;31(7):1235–70.

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