# Researchers release COILD corpus for Indian language machine translation

Digest AI · Research · published 2026-09-25T04:00:00Z

Canonical: https://digestai.news/story/researchers-release-coild-corpus-for-indian-language-machine-translati

## Summary

A team of researchers has introduced **COILD**, a new parallel corpus and benchmark for machine translation between Indian languages. The dataset includes over **1.16 million human-translated and verified sentence pairs** across **20 language pairs**, covering families like Indo-Aryan, Dravidian, Tibeto-Burman, and Austro-Asiatic. The data comes from **licensed repositories** and spans **eight real-world domains**, such as legal, medical, and literary texts, to reflect cultural and linguistic diversity beyond English-centric models.

The researchers also created a **domain-centric benchmark** of **2,000 expert-verified sentences** for consistent evaluation. Testing fine-tuned models—**IndicTrans2-Distilled** and **NLLB-200**—showed improved translation quality across metrics and human reviews. The work aims to support better multilingual AI for Indian languages, where existing datasets often lack depth or cultural relevance.

## Key points

- COILD corpus contains 1.16 million human-translated sentence pairs across 20 Indian language pairs
- Data sourced from licensed repositories covering eight real-world domains like legal and medical texts
- Fine-tuning IndicTrans2-Distilled and NLLB-200 models improved translation accuracy per researchers

## Why it matters

COILD addresses a critical gap in AI training data for Indian languages, enabling more accurate and culturally relevant machine translation beyond English-centric models.

## Sources

1. [COILD: An Indic-Centric Parallel Corpus and Benchmark for Machine Translation Across Indian Languages](https://arxiv.org/abs/2609.28826) (arXiv cs.CL, 2026-09-25, primary source)

Part of the developing story: [Global Efforts Expand Machine Translation Corpora](https://digestai.news/thread/new-wolofarabic-corpus-boosts-machine-translation-accuracy) (2 stories)

## Cite

Digest AI, "Researchers release COILD corpus for Indian language machine translation", 25 September 2026, https://digestai.news/story/researchers-release-coild-corpus-for-indian-language-machine-translati

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