| { | |
| "paper_id": "2021", | |
| "header": { | |
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| "date_generated": "2023-01-19T02:09:44.202811Z" | |
| }, | |
| "title": "XMU's Simultaneous Translation System at NAACL 2021", | |
| "authors": [ | |
| { | |
| "first": "Shuangtao", | |
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| "last": "Li", | |
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| "institution": "Xiamen University", | |
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| "settlement": "Xiamen", | |
| "country": "China" | |
| } | |
| }, | |
| "email": "lishuangtao@stu.xmu.edu.com" | |
| }, | |
| { | |
| "first": "Jinming", | |
| "middle": [], | |
| "last": "Hu", | |
| "suffix": "", | |
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| "institution": "Xiamen University", | |
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| "settlement": "Xiamen", | |
| "country": "China" | |
| } | |
| }, | |
| "email": "" | |
| }, | |
| { | |
| "first": "Boli", | |
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| "last": "Wang", | |
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| "institution": "Xiamen University", | |
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| "settlement": "Xiamen", | |
| "country": "China" | |
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| "email": "" | |
| }, | |
| { | |
| "first": "Xiaodong", | |
| "middle": [], | |
| "last": "Shi", | |
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| "institution": "Xiamen University", | |
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| "country": "China" | |
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| }, | |
| { | |
| "first": "Yidong", | |
| "middle": [], | |
| "last": "Chen", | |
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| "institution": "Xiamen University", | |
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| "country": "China" | |
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| "email": "ydchen@xmu.edu.cn" | |
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| "abstract": "This paper describes XMU's two systems submitted to the simultaneous translation evaluation at the 2nd automatic simultaneous translation workshop, which are for Zh->En textto-text translation and Zh->En speech-to-text translation. In both systems, our translation model is based on Transformer. To translate streaming text, we use an adaptive policy to split the text into appropriate segments and translate them monotonically. Our speech-totext system is a pipeline system, in which the MT component is exactly the same as our textto-text system.", | |
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| "abstract": [ | |
| { | |
| "text": "This paper describes XMU's two systems submitted to the simultaneous translation evaluation at the 2nd automatic simultaneous translation workshop, which are for Zh->En textto-text translation and Zh->En speech-to-text translation. In both systems, our translation model is based on Transformer. To translate streaming text, we use an adaptive policy to split the text into appropriate segments and translate them monotonically. Our speech-totext system is a pipeline system, in which the MT component is exactly the same as our textto-text system.", | |
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| "section": "Abstract", | |
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| "text": "Simultaneous translation refers to translating the message from the speaker to the audience in realtime without interrupting the speaker. It is widely used in many scenarios such as international conferences and business negotiations. Simultaneous machine translation is a challenging task and has become an increasingly popular research field in recent years.", | |
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| "section": "Introduction", | |
| "sec_num": "1" | |
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| "text": "There have been some researches on simultaneous translation of speech input (Niehues et al., 2018; Ma et al., 2020b,c; Ren et al., 2020) , and some researches focused on text translation (Arivazhagan et al., 2019; Ma et al., 2020a) .", | |
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| "end": 98, | |
| "text": "(Niehues et al., 2018;", | |
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| "text": "Ma et al., 2020b,c;", | |
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| "text": "(Arivazhagan et al., 2019;", | |
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| "section": "Introduction", | |
| "sec_num": "1" | |
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| "text": "In this paper, we describe our two systems submitted to the simultaneous translation evaluation at the 2nd automatic simultaneous translation workshop, which are for Zh->En text-to-text translation and Zh->En speech-to-text translation. We build our systems with the state-of-the-art method , and verify the effectiveness of this method.", | |
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| "section": "Introduction", | |
| "sec_num": "1" | |
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| "text": "In this section, we describe our system submitted to Zh->En text-to-text simultaneous translation track.", | |
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| "section": "Text-to-text Track", | |
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| "text": "The main idea of this system is how human interpreters work. While listening to speakers, human interpreters constantly translate text segments that are appropriate to translate without waiting for more words, and meanwhile making the translation grammatically tolerable. Text segments considered appropriate to translate usually have clear and definite meaning, because the translation of such a segment is not likely to be changed by subsequent text. The authors of refered to such segments Meaningful Units (MU) and gived MUs a precise difinition. See Table 1 for an illustration.", | |
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| "start": 555, | |
| "end": 562, | |
| "text": "Table 1", | |
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| "sec_num": "2" | |
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| "text": "Our system works like a human interpreter described above and is composed of an MU classification model and a machine translation model. Once a segment is classified to be an MU by the MU classifier, the MT model uses forced decoding with previous translation as the prefix to translate the segment, as shown in Table 1 .", | |
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| "text": "Table 1", | |
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| "section": "Text-to-text Track", | |
| "sec_num": "2" | |
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| "text": "Our machine translation model is implemented with FAIRSEQ 1 (Ott et al., 2019) .", | |
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| "start": 60, | |
| "end": 78, | |
| "text": "(Ott et al., 2019)", | |
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| "section": "Machine translation", | |
| "sec_num": "2.1" | |
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| "text": "Data and preprocessing. The data we use are CWMT19 2 (9.1M parallel sentences pairs) and the simultaneous translation corpus (39K parallel sentences pairs) provided by the organizer of the workshop.", | |
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| "section": "Machine translation", | |
| "sec_num": "2.1" | |
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| "text": "We do the following steps to preprocess the data.", | |
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| "section": "Machine translation", | |
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| "text": "\u2022 Filtering. The sentence pairs whose English sentence is longer than 120 words are filtered out. Table 1 : An illustration of how a human interpreter work. The source sentence is splited to three MUs (separated by \"||\"), and an interpreter translates the MUs in order and makes them form a grammatically correct sentence.", | |
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| "text": "Table 1", | |
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| "section": "Machine translation", | |
| "sec_num": "2.1" | |
| }, | |
| { | |
| "text": "\u2022 There are a few punctuation marks, numbers and letters in the data which are in full width. They are converted to half width characters.", | |
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| "section": "Machine translation", | |
| "sec_num": "2.1" | |
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| { | |
| "text": "\u2022 There are a few Chinese characters in the data which are traditional characters. They are converted to simplified ones.", | |
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| "section": "Machine translation", | |
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| { | |
| "text": "\u2022 Chinese segmentation. All Chinese sentences are segmented with Jieba Chinese Segmentation Tool 3 .", | |
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| "section": "Machine translation", | |
| "sec_num": "2.1" | |
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| { | |
| "text": "\u2022 English tokenization. All English sentences are tokenized and truecased with Moses 4 .", | |
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| "section": "Machine translation", | |
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| "text": "\u2022 Byte-pair-encoding (BPE) (Sennrich et al., 2016) . Both Chinese and English data are encoded by BPE with Subword-NMT 5 . The number of merge operations for each language is set to 30K.", | |
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| "text": "(Sennrich et al., 2016)", | |
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| "section": "Machine translation", | |
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| "text": "Modeling and training. Our translation model's architecture is base Transformer (Vaswani et al., 2017) . We use Adam optimizer (Kingma and Ba, 2015) to optimize the loss. We use weight decay of 1e \u22124 and dropout with probability of 0.2 for regularization. Label smoothing with of 0.1 is applied to our model. During inference, we set beam size to 20. Our model is first pretrained on CWMT and then finetuned on the the training set of the Baidu Speech Translation Corpus (Zhang et al., 2021) . We set learning rate to 5e \u22124 in the pretraining stage and 3e \u22125 in the fine-tuning stage. The learning rate is linearly increased for the first 4000 training steps, and is decreased following an inverse squareroot schedule.", | |
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| "end": 102, | |
| "text": "(Vaswani et al., 2017)", | |
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| "start": 471, | |
| "end": 491, | |
| "text": "(Zhang et al., 2021)", | |
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| "section": "Machine translation", | |
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| "text": "Modeling and training. The MU classifier is a binary classifier. Given a source word sequence x = {x 1 , x 2 , ..., x n }, the MU classifier determines whether x ends with an MU, and if so the MT will translate x with forced decoding. The input of the classifier is x and m \"future\" words", | |
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| "section": "MU classifier", | |
| "sec_num": "2.2" | |
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| { | |
| "text": "x x f (m = 2) c \u725b\u987f || \u53d1\u73b0 \u4e86 1 \u725b\u987f || \u53d1\u73b0 \u4e86 \u725b\u987f 0 \u725b\u987f || \u53d1\u73b0 \u4e86 || \u725b\u987f \u8fd0\u52a8 1 \u725b\u987f || \u53d1\u73b0 \u4e86 || \u725b\u987f \u8fd0\u52a8 \u5b9a\u5f8b 0", | |
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| "section": "MU classifier", | |
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| { | |
| "text": "x f = {x n+1 , x n+2 , ..., x n+m },", | |
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| "text": "where m is a hyperparameter. The outputs are the probabilities of two classes p(c = 1) and p(c = 0), which mean x ends with an MU or not. x will be classified into class 1 if p(c = 1) > t, where t is a threshold set based on experience. Obviously, we can control the latency of simultaneous translation by modifying m. Later in experiments, it will be shown that we can also control the latency by modifying t. In our system, m is always set to 2.", | |
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| "section": "MU classifier", | |
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| "text": "The MU classifier is based on a chinese BERT (Devlin et al., 2019) 6 . We use the base model and fine-tune it with a learning rate of 5e \u22124 .", | |
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| "text": "(Devlin et al., 2019) 6", | |
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| "section": "MU classifier", | |
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| "text": "Generating MU samples. To build an MU classifier, we need to generate MU samples just like the samples in Table 2 . For each sentence of length N , we generate N \u2212 m examples for it, and every MU sample is a triple < x, x f , c >. When we generate examples, c is set to 1 if x ends with an MU, else it is set to 0. In our system, we generate MU samples for every sentence pairs in CWMT and the simultaneous translation corpus. Our MU samples are a little different from the MU samples in . In their work, the future words of a sample can be less than m, but not in this paper. We do not need training samples whose future words are less than m, because during inference when the future words are less than m, the sentence is already a whole sentence and thus can be fed into MT.", | |
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| "text": "We use the basic method proposed in to generate MU samples.", | |
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| "text": "In this section, we describe our system submitted to Zh->En speech-to-text simultaneous translation track.", | |
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| "section": "Speech-to-text Track", | |
| "sec_num": "3" | |
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| "text": "This system is a pipeline of three stages: (1) speech recognition, (2) punctuation restoration, and (3) streaming machine translation. The third stage is exactly the same as the system described in Section 2. In other words, the system described in Section 2 is a part of our speech-to-text system, and therefore it will not be repeated in this section. This section only describes the stage (1) and stage (2).", | |
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| "text": "Instead of building a speech recognition model, we use Baidu's real time speech recognition service 7 . In our system, We call the API of this service to recognize streaming speech. It is important to note that although the ASR does not output punctuation, it separates different sentences, that is, the ASR outputs are many segmented sentences instead of one sentence.", | |
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| "text": "The recognition results of Baidu's asr service do not have punctuation, but the input of our MT model needs punctuation. As a result we build a model to restore the punctuation for every recognition result. We use a BERT-based (Devlin et al., 2019) sequence labeling model (Chen and Shi, 2020) to do punctuation restoration. This model labels every Chinese character in a sentence, and for the model we only consider four classes: comma, period, question mark and no punctuation.", | |
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| "text": "In this section, we evaluate our two systems on the development set of the Baidu Speech Translation Corpus (Zhang et al., 2021) . The two used metrics are case-sensitive detokenized BLEU (Papineni et al., 2002) and Consecutive Wait (CW) (Neubig et al., 2017) , for translation quality and latency respectively. CW considers on how many source words are waited for consecutively between two target words, and thus larger CW means longer latency. We use SacreBLEU (Post, 2018) to compute BLEU scores. ", | |
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| "text": "We set the threshold t in the MU classifier to various values and get multiple results, as shown in Figure 1 . It is worth noting that the rightmost point in Figure 1 is not a result of simultaneous translation. This result is got by translating every sentence after it is finished, i.e., we get this result by translating whole sentences.", | |
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| "text": "The experimental results are shown in Figure 2 . Similarly, the rightmost point is not a result of simultaneous translation. Because the speech in the development set is difficult for ASR, the ASR does not perform well, resulting in a character error rate of 35.3%. The errors caused by ASR are brought to MT, and thus the BLEU is much lower than in the text-to-text track.", | |
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| "text": "From Figure 1 and Figure 2 , we can observe that the larger the threshold t is, the longer the latency is. This is because the larger the threshold t is, the longer the detected MUs are, which further leads to longer waiting time between two translations. We can also observe that the larger the threshold t is, the higher the translation quality is. This is because the larger the threshold t is, the more likely a detected MU is a true MU and thus the translation of the detected MU will not be changed by subsequent incoming text. Table 3 is an illustration for this.", | |
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| "section": "Analysis", | |
| "sec_num": "4.3" | |
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| "text": "Source: \u597d \uff0c \u8ba9 \u6211\u4eec \u6765\u770b \u4e0b\u4e2a \u4f8b\u5b50 \u3002 okay let we look next example Reference:", | |
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| "text": "Okay , let 's look at the next example . Simultaneous Translation (t = 0.7): OK , let 's look at the next example . Simultaneous Translation (t = 0.5): Okay , || let 's look at the next example . Simultaneous Translation (t = 0.3): Okay , || let 's do it . || let 's look at the next example . Table 3 : An illustration of text-to-text simultaneous translation with different threshold t. \"||\" is a symbol for separating the translations of detected MUs. ", | |
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| { | |
| "text": "We have built two systems for text-to-text simultaneous translation and speech-to-text simultaneous translation. The key of our systems is the basic adaptive segmentation policy in . With this policy, simultaneous translation can be achieved without any modification to the MT component, and the latency can be controlled. In our future work, we would like to study how to improve the cooperation of ASR and MT and the performance of MU classification.", | |
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| "section": "Conclusion", | |
| "sec_num": "5" | |
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| "text": "https://github.com/fxsjy/jieba 4 https://github.com/moses-smt/mosesdecoder 5 https://github.com/rsennrich/subword-nmt", | |
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| "text": "https://github.com/649453932/Bert-Chinese-Text-Classification-Pytorch", | |
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