Chokri (also known as Chakru, ISO 639-3: nri, Glottocode: chok1243) belongs to the Tibeto-Burman language family, specifically classified within the Angami-Pochuri branch of the Southern Tibeto-Burman subgroup.

Speakers

According to the 2011 Census of India, there are approximately 91,257 speakers of Chakru/Chokri in India.

Distribution in India

Chokri is predominantly spoken in the northeastern state of Nagaland, India. It is concentrated heavily in the Phek district, particularly across the Pfütsero, Chetheba, and Chazouba administrative circles.

Major grammatical features

Phonology: Chokri is a tonal language characterised by a complex pitch/tone system that distinguishes lexical meaning. Its consonant inventory is notable for contrasting aspirated and unaspirated stops, alongside a series of voiceless sonorants (including voiceless nasals and laterals) typical of Angami-Pochuri languages.
Morphology: The language is predominantly agglutinative. Morphological processes rely heavily on suffixation and prefixation for word formation. Nouns take possessive prefixes corresponding to person and number, and verbs are modified by a range of aspectual, modal, and directional markers.
Syntax: Chokri exhibits a basic Subject-Object-Verb (SOV) constituent word order. It is a postpositional language where modifiers like numerals and demonstratives generally follow the head noun, while relative clauses can precede or follow the noun they modify.

Dataset Description

The Chokri Speech Dataset, developed as part of the Speech Datasets and Models for Tibeto-Burman Languages (Project SpeeD-TB) funded under Mission Bhashini, is a transcribed speech corpus of Chokri. The full dataset comprises over 200 hours of high-quality audio recordings paired with accurate transcriptions in both IPA and Roman script, making it the first and largest resource for the language that not only enables building and evaluating voice models in low-resource linguistic settings but also enables large-scale linguistic description and documentation of the language. The audio data captures a diverse range of speakers across different age groups, genders, and education levels, ensuring variability in pronunciation, speech patterns, and tone. It includes both spontaneous and read speech collected in naturalistic and semi-controlled environments, thereby reflecting real-world linguistic usage. The transcriptions are carefully prepared and normalised to maintain consistency, supporting robust model training. This dataset also contributes to the preservation and digital documentation of the Toto language by transforming oral knowledge into structured, machine-readable formats.

Almost 60% of the data in the corpus is included from domains of agriculture, education and science & technology. Rest of the data is from varied domains including culture, lifecycle, sports, entertainment, healthcare and oral history, thereby, giving a large coverage. We have also used a variety of elicitation methods for collecting the data including translations, narrations, lectures, role-play, spontaneous conversations, interviews and picture and video descriptions. The released dataset is meticulously mapped to a rich metadats including demographic and linguistic metadata of the speakers, domains, elicitation methods and to individual prompts. The audio included in the current dataset is already sliced at sentence level, thereby, ready to be integrated into the model training pipeline out-of-the-box.

The overall dataset of the project is collected over multiple phases and using multiple questionnaires. This repository contains the data collected from the field using narration methods.

Ethical Considerations, IPR and Attribution

This repository represents our commitment to not only fair remuneration to the speakers of the language but also to co-ownership and equal IPR to all the contributors who have built the dataset. We believe this is the first step to move away from extractive data collection and use practices and ensure fairness in our treatment of the community members. As such, we have listed all speakers and transcribers as Contributors to the dataset. This dataset is only licensed to other researchers for use in their research projects. More details about licensing and commercial use conditions are given in the License and Commercial Use sections.

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