The evaluation of a many-to-many multilingual translation model can include a human evaluation study to assess translation quality. This study can focus on translation directions that do not involve English, particularly between languages commonly spoken in the same region (e.g., Japanese-Chinese, Hindi-Tamil, and Russian-Ukrainian).

University of Michigan - Ann Arbor

Google

1) Language selection \n 
2) Evaluation
3) Covering the Language Matrix by Mining

How to Build a Many-to-Many Parallel Dataset for 100 Languages

The first step of establishing a Many-to-Many dataset is to select 100 languages for which there already exist high-quality, annotated datasets that can be used for model evaluation.

                 
       Therefore, We cover a diversity of scripts and resource levels (as shown in Table 1) to have high coverage of languages worldwide. (widely spoken language)

Language selection

Supervised translation systems rely on large quantities of parallel sentences

Hence, we use mining technique

Covering the Language Matrix

Goal: 

is to build a single model capable of translating 9, 900 language directions covering 100 languages. 

Challenge: 

This creates several challenges for models with insufficient capacity to capture that many languages and scripts adequatel

Components for Scaling Multilingual Translation Models

We use publicly available evaluation datasets to evaluate the performance of all of our models. 

To cover our set of 100 languages and 2200 direction

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