natural language toolkit semantic interpretation c 20012023 nltk project ewan klein ewaninf ed ac uk url https www nltk org for license information see license txt nltk semantic interpretation package this package contains classes for representing semantic structure in formulas of firstorder logic and for evaluating such formulas in settheoretic models from nltk sem import logic logic counter value 0 the package has two main components logic provides support for analyzing expressions of first order logic fol evaluate allows users to recursively determine truth in a model for formulas of fol a model consists of a domain of discourse and a valuation function which assigns values to nonlogical constants we assume that entities in the domain are represented as strings such as b1 g1 etc a valuation is initialized with a list of symbol value pairs where values are entities sets of entities or sets of tuples of entities the domain of discourse can be inferred from the valuation and model is then created with domain and valuation as parameters from nltk sem import valuation model v adam b1 betty g1 fido d1 girl set g1 g2 boy set b1 b2 dog set d1 love set b1 g1 b2 g2 g1 b1 g2 b1 val valuationv dom val domain m modeldom val from nltk sem glue import glue from nltk sem hole import holesemantics from nltk sem cooperstorage import cooperstore don t import chat80 as its names are too generic natural language toolkit semantic interpretation c 2001 2023 nltk project ewan klein ewan inf ed ac uk url https www nltk org for license information see license txt nltk semantic interpretation package this package contains classes for representing semantic structure in formulas of first order logic and for evaluating such formulas in set theoretic models from nltk sem import logic logic _counter _value 0 the package has two main components logic provides support for analyzing expressions of first order logic fol evaluate allows users to recursively determine truth in a model for formulas of fol a model consists of a domain of discourse and a valuation function which assigns values to non logical constants we assume that entities in the domain are represented as strings such as b1 g1 etc a valuation is initialized with a list of symbol value pairs where values are entities sets of entities or sets of tuples of entities the domain of discourse can be inferred from the valuation and model is then created with domain and valuation as parameters from nltk sem import valuation model v adam b1 betty g1 fido d1 girl set g1 g2 boy set b1 b2 dog set d1 love set b1 g1 b2 g2 g1 b1 g2 b1 val valuation v dom val domain m model dom val from nltk sem glue import glue from nltk sem hole import holesemantics from nltk sem cooper_storage import cooperstore don t import chat80 as its names are too generic
from nltk.sem.boxer import Boxer
from nltk.sem.drt import DRS, DrtExpression
from nltk.sem.evaluate import (
    Assignment,
    Model,
    Undefined,
    Valuation,
    arity,
    is_rel,
    read_valuation,
    set2rel,
)
from nltk.sem.lfg import FStructure
from nltk.sem.logic import (
    ApplicationExpression,
    Expression,
    LogicalExpressionException,
    Variable,
    binding_ops,
    boolean_ops,
    equality_preds,
    read_logic,
)
from nltk.sem.relextract import clause, extract_rels, rtuple
from nltk.sem.skolemize import skolemize
from nltk.sem.util import evaluate_sents, interpret_sents, parse_sents, root_semrep