arXiv Computation and Language By Telem Joyson Singh, Sanabam Boyshana, Sanasam Ranbir Singh, Priyankoo Sarmah

Towards English - Mizo Legal Machine Translation: Corpus Creation, Analysis, and Benchmarks

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The paper introduces the first English‑Mizo parallel dataset of Indian court judgments, comprising 13,168 sentence pairs from the Gauhati High Court and the Supreme Court of India. Professional native Mizo translators produced complete documents, after which sentence pairs were manually aligned and independently reviewed. Analysis reveals selective borrowing of English words—official and legal terms remain in English while everyday terms are rendered in Mizo—and inconsistent use of Mizo diacritics. Fine‑tuning the NLLB‑200 1.3B model on this corpus yields a 27.47 BLEU score on a balanced legal test set, improving by 7.16 BLEU over the base model, yet the model still over‑uses English words compared to human translation.

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