ACE Entity Mention Detection Task
Jump to navigation
Jump to search
An ACE Entity Mention Detection Task is a Benchmark Task put together by the ACE Program to test an Entity Mention Detection Algorithm.
References
- Miscellaneous
- Annotators tag all mentions of each entity within a document, whether named, nominal or pronominal. For every mention, the annotator identifies the maximal extent of the string that represents the entity, and labels the head of each mention. Nested mentions are also captured.
- Name mentions: The mention uses a proper name to refer to the entity
- Nominal mentions: The mention is a noun phrase whose head is a common noun
- Pronominal mentions: The mention is a headless noun phrase, or a noun phrase whose head is a pronoun, or a possessive pronoun
- ACE English Entity Guidelines v6.6 4 2008.06.13
- http://projects.ldc.upenn.edu/ace/docs/English-Entities-Guidelines_v6.6.pdf
- An entity is an object or set of objects in the world. A mention is a reference to an entity. Entities may be referenced in a text by their name, indicated by a common noun or noun phrase, or represented by a pronoun. For example, the following are several mentions of a single entity:
Name Mention: Joe Smith Nominal Mention: the guy wearing a blue shirt Pronoun Mentions: he, him
- 5 Mention Types/Mention Levels
- For each entity, we record and coreference all mentions of the entity. Mentions will frequently be nested; that is, they will contain mentions of other entities. For example, the phrase The president of Ford is a mention of an entity of type Person, and contains the name "Ford", a mention of an entity of type Organization. It is even possible for a noun phrase to contain an embedded mention of the same entity. For instance, the phrase The historian who taught herself Cobol evokes a Person entity with three mentions: the entire phrase, and the words "herself” and “who”.
- 5.1.6 NAM vs. NOM
- Some ambiguities can arise when trying to make a NAM-NOM distinction. It may appear that a NOM is being used to name something, or that a NAM mention may be decomposable into a few NOMs.
- A general property of NAMs is that they are defined to pick out one particular entity as a referent. They are unique identifiers, like "Vladimir Putin" or "The United States." NOMs, on the other hand, define an entire category. They can pick out a referent which belongs to that category, but only after disambiguating it from all other potential members of the category. If a nominal mention is used as an individual reference in a
- 5 Mention Types/Mention Levels
discourse, the head noun often has to be “individualized” via quantification and/or qualification with determiners, adjectives, relative clauses, etc. [Vladimir Putin] sat at the table. [Vladimir Putin] NAM [The man] sat at the table. [The man] NOM
- 5.1.6 Pronouns (PRO)
- Pronouns with the exception of wh-question words and the specifier ‘that’.
- 5.1.6 Pronouns (PRO)
[he], [they], [no one], [I], [That]’s not mine. (demonstrative “that” not specifier “that” used to introduce a relative clause) [These] have more terminals than the other top-ranking airports [his own] [everyone]
- 6 Nickname Metonymy
- Metonymy occurs when a speaker uses a reference to one entity to refer to another entity (or entities) related to it. For example, in the sentence below Beijing is a capital city name that is used as a reference to the Chinese government: Beijing will not continue sales of anti-ship missiles to Iran.
- 7 Cross-Type Metonymy
- Cross-Type Metonymy occurs when more than one aspect of an entity is referenced in a document. For example, entities of type Organization often have a physical entity of type Facility associated with them. These two incarnations of the same entity will be tagged as type Organization when the textual reference is directly referring to the organization and as type Facility when the mention refers to the physical building.
- 6 Nickname Metonymy