Hindi Treebank



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tarix02.01.2018
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Hindi Treebank

    • Dipti Misra Sharma
    • LTRC
    • International Institute of Information Technology
    • Hyderabad
    • India

Outline

  • Hindi Language

  • Some Problem Cases

  • Our Approach

  • The team



Hindi Language

  • Relatively simpler morphology – compared to other Indian Languages

  • Relatively flexible word order

  • For example,

  • 1. a) baccaa phala khaataa hai

  • ‘child’ ‘fruit’ ‘eats’

  • b) phala baccaa khaataa hai

  • c) phala khaataa hai baccaa

  • d) baccaa khaataa hai phala



Basic Structure in PS



PS for 1(b)



Problems

  • Complex tree

  • In what ways subject (baccaa) is different from object (phala) ?



How to Draw PSs for 1 (c-d) ?

  • 1 c) baccaa khaata hai phala

  • 'child' 'eat+hab' 'pres' 'fruit'

  • 1 d) phala khaata hai baccaa

  • 'fruit' 'eat+hab' 'pres' 'child'

  • Simple and perfectly natural sentences - difficult to handle in Phrase Structure

  • Dependency structures make it easy



Dependency Structure



Complex predicates

  • Two different entities behave as a single unit

    • Conjunct verb ‘prashna kiyaa’ below
    • 2. mohana ne ravi se prashna kiyaa
  • 'Mohan' 'erg' 'Ravi' 'to' 'question' 'did'

  • “Mohan asked Ravi a question'

  • 'Mohan' 'erg' 'one' 'question' 'do+perf' 'past'

    • The elements in a complex predicate can also be dis-contiguous
    • 4. prashna to mohana ne kiyaa thaa
    • 'question' 'part' 'Mohan' 'erg' 'do+perf' 'past'




DS for Dis-contiguous Elements



Selected Paninian Dependency Model

  • Paninian Grammatical model

    • Better for languages with flexible word order
    • Works at syntactico-semantic level
  • Offers two levels of analysis

    • Relations :
      • Kaaraka : Direct relations of nouns to a verb
      • Other relations : Possesive, reason, cause etc
    • (semantic dependencies)
    • Vibhaktis : Relation markers
    • ( For details Akshar Bharati et al Natural Language Parsing - a Paninian Perspective (1995) )http://ltrc.iiit.net/showfile.php?filename=downloads/nlpbook/index.html


The Team

  • Rajeev Sangal

  • Dipti Misra Sharma

  • Lakshmi Bai

  • Ramakrishmacharyulu

  • Rafiya Begam

  • Samar Husain

  • Arun Dhwaj



Some More Phenomena

  • jo-vo constructions

  • mujhase gilaasa TuuTa gayaa

  • 'by me' 'glass' 'break' 'went'

  • * “The glass broke by me”

  • raama sabase baDaa putra thaa dasharatha kaa

  • 'Ram' 'most' 'big' 'son' 'was' 'Dasharatha' 'of'

  • “Ram was the eldest son of Dasharatha'



PS



DS





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