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Coherence (Relation) Extraction

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Coherence (Relation) Extraction
  • a discourse is coherent when its sentences are logically related to each other
  • coherence extraction is important for:
    • coreference
    • word sense disambiguation
    • interpretation
    • other linguistic problems

Coherence Relation Types

๐‘†0ย and ๐‘†1represent the meanings of two related sentences

Result

Infer that ๐‘†0ย causes or could cause the state ๐‘†1or event asserted by
John bought an Acura. His father went ballistic

Explanation

Infer that S1ย causes or could cause the state or event asserted by ๐‘†0
John hid Billโ€™s car keys. He was drunk

Parallel

Infer ๐‘ƒ(๐‘Ž1, ๐‘Ž2, โ€ฆ) from the assertion of ๐‘†0ย and ๐‘ƒ(๐‘1, ๐‘2, โ€ฆ) from theย assertion of S1, where ๐‘Ž๐‘–ย and ๐‘๐‘–ย are similar, for all ๐‘–
John bought an Acura. Bill leased a BMW

Elaboration

Infer the same proposition ๐‘ƒ from the assertions of ๐‘†0ย and ๐‘†1
John bought an Acura. He purchased a beautiful New Integra

Occasion

a change of state can be inferred from ๐‘†0, whose final state can be inferred from ๐‘†1, or vice-versa,
a change of state can be inferred from ๐‘†1, whose initial state can be inferred from ๐‘†0John bought an Acura. He drove to the ballgame.

etc

Action-Based Coherence

Effect Causality

every action has some effects:

  • intended effects
  • side effects

Precondition Causality

every action has a set of conditions that typically must hold before action starts

Enablement

an action enables another if the effects of the first establish 1 or more preconditions for the second
electric spark enables fire

Decomposition

an action is a subpart of another action if the first action is one of a sequence of substeps that constitute the execution of the second action
preheating oven is a substep of baking a cake

Generalization
Generation

an action generates another if executing the first also executes the second one
turn a switch on, generates turning a light on