Challenge: Recent work on simultaneous translation is difficult because of its latency and quality.
Approach: They propose a supervised-learning framework to learn adaptive policies from parallel text sequences . they use a model that predicts when a target word is read or WRITE if context provides enough information .
Outcome: Experiments on German=>English show that the proposed method can learn flexible policies with better BLEU scores and similar latencies compared to previous work.

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Simultaneous Translation Policies: From Fixed to Adaptive (2020.acl-main)

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Challenge: Adaptive policies can balance translation quality and latency based on context information . previous methods on obtaining adaptive policies rely on complicated training process .
Approach: They propose to obtain adaptive policies by a simple heuristic composition of fixed policies . they propose to use a heurism to obtain policies that can outperform fixed ones .
Outcome: Experiments on Chinese -> English and German -> english show that adaptive policies outperform fixed policies by up to 4 BLEU points for the same latency.
Simultaneous Translation with Flexible Policy via Restricted Imitation Learning (P19-1)

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Challenge: Existing approaches to simultaneous translation have been limited and use fixed-latency policies or a complicated two-staged model.
Approach: They propose a single model that adds a “delay” token to the target vocabulary and a restricted dynamic oracle to greatly simplify training.
Outcome: The proposed model achieves better BLEU scores and lower latencies compared to fixed and RL-learned policies on Chinese -> English simultaneous translation.
Learning Coupled Policies for Simultaneous Machine Translation using Imitation Learning (2021.eacl-main)

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Challenge: Existing approaches to learn simultaneous translation model with coupled programmer-interpreter policies are suboptimal as they fix the agent's policy to focus learning the NMT model or learn adaptive agent policies while the NRT model is fixed.
Approach: They propose an algorithmic oracle to produce oracular READ/WRITE actions for training bilingual sentence-pairs using the notion of word alignments.
Outcome: The proposed method outperforms baselines in terms of translation quality quality while keeping the delay low.
Learning Adaptive Segmentation Policy for Simultaneous Translation (2020.emnlp-main)

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Challenge: Experimental results show that adaptive segmentation policies for simultaneous translation are more accurate than current methods . if translation starts before adequate source content is delivered, the quality of translation degrades . waiting for too much source text increases latency, which would hurt accuracy .
Approach: They propose a new adaptive segmentation policy for simultaneous translation based on human interpreters . it learns to segment the source text by considering possible translations produced by the translation model .
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Learning Adaptive Segmentation Policy for End-to-End Simultaneous Translation (2022.acl-long)

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Challenge: Existing methods to perform simultaneous speech-to-text translation ignore contextual information and suffer from low translation quality.
Approach: They propose an adaptive segmentation policy for simultaneous speech-to-text translation . it learns to segment the source streaming speech into meaningful units .
Outcome: The proposed method achieves a good accuracy-latency trade-off over state-of-the-art methods on English-German and Chinese-English.
Translation-based Supervision for Policy Generation in Simultaneous Neural Machine Translation (2021.emnlp-main)

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Challenge: Existing approaches to train simultaneous machine translation agents have been used to find the optimal action sequences for translation quality and lag.
Approach: They propose a supervised learning approach that detects minimum reads required for generating target tokens by comparing simultaneous translations against full-sentence translations.
Outcome: The proposed method produces much higher quality translations while minimizing the average lag in simultaneous translation.
A Generative Framework for Simultaneous Machine Translation (2021.emnlp-main)

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Challenge: Existing approaches use a fixed number of source words to translate or learn dynamic policies for the number of sources by reinforcement learning.
Approach: They propose a generative framework that uses a latent variable to model read or translate actions at every time step and integrates out to consider all possible translation policies.
Outcome: The proposed framework achieves the best BLEU scores on benchmark datasets.
DrFrattn: Directly Learn Adaptive Policy from Attention for Simultaneous Machine Translation (2025.emnlp-main)

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Challenge: Existing approaches to learn read/write policies from attention mechanism may compromise effectiveness of attention mechanism .
Approach: They propose a method that directly learns adaptive policies from the attention mechanism . experimental results demonstrate that the method achieves an improved balance between translation accuracy and latency.
Outcome: The proposed method achieves improved balance between translation accuracy and latency.
Adaptive Policy with Wait-k Model for Simultaneous Translation (2023.emnlp-main)

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Challenge: Existing approaches to simultaneous machine translation require a robust read/write policy . a standalone multi-path wait-k model performs competitively with adaptive policies .
Approach: They propose a more flexible approach by decoupling the adaptive policy model from the translation model.
Outcome: The proposed approach outperforms baseline approaches in translation tasks.
Fluent and Low-latency Simultaneous Speech-to-Speech Translation with Self-adaptive Training (2020.findings-emnlp)

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Challenge: Current approaches to simultaneous speech-to-speech translation accumulate more and more latencies in later sentences when the speaker talks faster.
Approach: They propose a method which generates more fluent target speech latency than the baseline . they propose to use self-adaptive translation to adjust the length of translations to accommodate different source speech rates.
Outcome: Xiong et al., 2019) show that the proposed method generates more fluent target speech latency than baseline . authors say it provides more natural communication process than speech-to-text translation . xiong and colleagues say the proposed technique is more efficient than current approaches .

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