Challenge: a common solution to zero-shot translation is to add as many related translation directions as possible to the training corpus.
Approach: They show that a small amount of multi-parallel data can achieve significant zero-shot improvements . they say that the resulting non-English performance is close to the complete translation upper bound .
Outcome: The proposed model achieves +21.7 ChrF++ non-English translation improvements on EC30 dataset . the resulting non- English performance exceeds M2M100 by an average of 5.9 ChrF+ .

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Challenge: Traditionally, success in multilingual machine translation depends on large volume, diverse directions, and high quality of training data.
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Challenge: Existing unsupervised neural machine translation systems can degrade when labeled data is limited.
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Challenge: Recent work shows that large language models can generalize to machine translation using zero-shot examples with in-context learning.
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Challenge: Prior work has investigated causes of poor zero-shot performance, but new study suggests it does not exhibit poor zero shot capability.
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SMaLL-100: Introducing Shallow Multilingual Machine Translation Model for Low-Resource Languages (2022.emnlp-main)

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Challenge: Existing models for multilingual machine translation use scaling up the number of parameters to overcome the curse of multilinguality.
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