Description of all 70 basic features.
| Id . | Description . | Type . | # . |
|---|---|---|---|
| Lexical Features | 25 | ||
| L1 | Head word of i (j) | word | 2 |
| L2 | String matching of i and j | boolean | 1 |
| L3 | String matching of the head words of i and j | boolean | 1 |
| L4 | Both i and j are pronouns and their strings match | ternary | 1 |
| L5 | Both i and j are not pronouns and their string match | ternary | 1 |
| L6 | Previous and next two words of i (j) | word | 8 |
| L7 | Number of tokens in i (j) | integer | 2 |
| L8 | Edit distance of head words of i and j | integer | 1 |
| L9 | Edit distance of i and j after removing determiners | integer | 1 |
| L10 | i (j) is a definite noun phrase | boolean | 2 |
| L11 | i (j) is a demonstrative noun phrase | boolean | 2 |
| L12 | The head word of both i and j are proper nouns | boolean | 1 |
| L13 | Both i and j are proper names and their strings match | ternary | 1 |
| L14 | Both i and j are proper names and their head word strings match | ternary | 1 |
| Syntactic Features | 28 | ||
| Sy1 | POS tag of the head word of i (j) | POS tag | 2 |
| Sy2 | Previous and next two POS tags of i (j) | POS tag | 8 |
| Sy3 | i (j) is a pronoun | boolean | 2 |
| Sy4 | Gender of i (j), if pronoun | f, m, n/a | 2 |
| Sy5 | i and j are both pronouns and agree in gender | ternary | 1 |
| Sy6 | i and j are both pronouns and agree in number | ternary | 1 |
| Sy7 | i (j) is a proper name | boolean | 2 |
| Sy8 | i and j are both proper names | boolean | 1 |
| Sy9 | Previous and next predicate of i (j) within its sentence | verb | 4 |
| Sy10 | i and j are pronouns and agree in number, gender, and person | ternary | 1 |
| Sy11 | Noun phrase embedding level of i (j) in the syntactic parse | integer | 2 |
| Sy12 | Number of embedded noun phrases in i (j) | integer | 2 |
| Semantic Features | 13 | ||
| Se1 | Baseline system prediction | binary | 1 |
| Se2 | Sense of the head word of i (j) | sense | 2 |
| Se3 | Named entity type of i (j) | NE tag | 2 |
| Se4 | i and j have the same named entity type | ternary | 1 |
| Se5 | Previous and next semantic roles for i (j) within its sentence | SRL tag | 4 |
| Se6 | Concatenation of semantic roles of i and j for the same predicate, if they are in the same sentence | (SRL tag)2 | 1 |
| Se7 | i and j have the same speaker | ternary | 1 |
| Se8 | j is an alias of i as suggested by Ng and Cardie (2002) | boolean | 1 |
| Positional Features | 4 | ||
| P1 | Distance between i and j in number of sentences | integer | 1 |
| P2 | Distance between i and j in number of mentions | integer | 1 |
| P3 | Distance between i and j in number of person names, when i and j are both pronouns or one of them is a person name | integer | 1 |
| P4 | One mention is in apposition to the other | boolean | 1 |
| Id . | Description . | Type . | # . |
|---|---|---|---|
| Lexical Features | 25 | ||
| L1 | Head word of i (j) | word | 2 |
| L2 | String matching of i and j | boolean | 1 |
| L3 | String matching of the head words of i and j | boolean | 1 |
| L4 | Both i and j are pronouns and their strings match | ternary | 1 |
| L5 | Both i and j are not pronouns and their string match | ternary | 1 |
| L6 | Previous and next two words of i (j) | word | 8 |
| L7 | Number of tokens in i (j) | integer | 2 |
| L8 | Edit distance of head words of i and j | integer | 1 |
| L9 | Edit distance of i and j after removing determiners | integer | 1 |
| L10 | i (j) is a definite noun phrase | boolean | 2 |
| L11 | i (j) is a demonstrative noun phrase | boolean | 2 |
| L12 | The head word of both i and j are proper nouns | boolean | 1 |
| L13 | Both i and j are proper names and their strings match | ternary | 1 |
| L14 | Both i and j are proper names and their head word strings match | ternary | 1 |
| Syntactic Features | 28 | ||
| Sy1 | POS tag of the head word of i (j) | POS tag | 2 |
| Sy2 | Previous and next two POS tags of i (j) | POS tag | 8 |
| Sy3 | i (j) is a pronoun | boolean | 2 |
| Sy4 | Gender of i (j), if pronoun | f, m, n/a | 2 |
| Sy5 | i and j are both pronouns and agree in gender | ternary | 1 |
| Sy6 | i and j are both pronouns and agree in number | ternary | 1 |
| Sy7 | i (j) is a proper name | boolean | 2 |
| Sy8 | i and j are both proper names | boolean | 1 |
| Sy9 | Previous and next predicate of i (j) within its sentence | verb | 4 |
| Sy10 | i and j are pronouns and agree in number, gender, and person | ternary | 1 |
| Sy11 | Noun phrase embedding level of i (j) in the syntactic parse | integer | 2 |
| Sy12 | Number of embedded noun phrases in i (j) | integer | 2 |
| Semantic Features | 13 | ||
| Se1 | Baseline system prediction | binary | 1 |
| Se2 | Sense of the head word of i (j) | sense | 2 |
| Se3 | Named entity type of i (j) | NE tag | 2 |
| Se4 | i and j have the same named entity type | ternary | 1 |
| Se5 | Previous and next semantic roles for i (j) within its sentence | SRL tag | 4 |
| Se6 | Concatenation of semantic roles of i and j for the same predicate, if they are in the same sentence | (SRL tag)2 | 1 |
| Se7 | i and j have the same speaker | ternary | 1 |
| Se8 | j is an alias of i as suggested by Ng and Cardie (2002) | boolean | 1 |
| Positional Features | 4 | ||
| P1 | Distance between i and j in number of sentences | integer | 1 |
| P2 | Distance between i and j in number of mentions | integer | 1 |
| P3 | Distance between i and j in number of person names, when i and j are both pronouns or one of them is a person name | integer | 1 |
| P4 | One mention is in apposition to the other | boolean | 1 |