DeepCompose

DeepCompose is a framework for intensional semantics.

This is an implementation of the Direct Compositional semantic framework as given in CLPS 1342: Compositional Semantics

Add entries to lexicon.txt using the following pattern and run main.py. Parsing rules are not enforced.

Zinkly ; NP ; e ; z
walks ; S/NP ; <e,t> ; m=1 p=0 z=0
< "Zinkly walks" ; S ; t ; walks'(z) ; 0 >

This framework has support for custom grammar rules, which require a test() and operate() function:

 class CombinatoryRule():   
  	def __init__(self, name, test, operate):
        """
        test takes whole lexical entries and only looks at their syntax
        Returns whether or not this rule can operate on the given syntax categories

        operate takes whole lexical entries
        Returns the resulting lexical entry after applying this rule
        """
        self.name = name
        self.test = test
        self.operate = operate

    def __call__(self, a, b):
        return self.operate(a, b)

    def __str__(self):
        return self.name

Example rule:

### R-1a

def R1a_test(a, b):
    return a.syntax.slash == SyntacticSlash.R and a.syntax.rhs == b.syntax


def R1a_operate(a, b):
    new_english = f"{a.english} {b.english}"
    new_category = a.category.lhs
    new_semantics = a.semantic_id(b.semantic_id)
    return LexicalEntry(english=new_english, syntacticCategory=new_category, semanticEntry=new_semantics)

A More Thorough Explanation

All linguistic expressions are triples: <[sound], Syntax Category, [[semantic meaning]]>

Expressions are combined and lifted using combinatory and unary rules. Combinatory rules take two expressions and combine to form a new expression, unary rules apply to a single expression and form a new expresion. These rules compose a grammar.

The semantic meaning of a linguistic expression is represented by a lambda calculus expression like likes(Porky)(Mitka), "Mitka likes treats." Here's what the entry for likes might look like:

likes ; (S/NP)/NP ; <e,<e,t>> ; m=(m=0 p=0) p=(m=1 p=0)

The Code

The LexicalStructures package is one of the most significant packages, definitely take a look. The two most important files in this package are LexicalEntry.py and Semantics.py.

The Grammar package is also significant, it houses the grammar rules and the Grammar object.

A LexicalEntry is a representation of a linguistic expression. Lexicon objects are collections of LexicalEntrys. Grammar rules operate on one or multiple LexicalEntrys.

Semantics.py contains all of the semantic structures. There is a primary semantic object that contains substructures, this is the SemanticEntry. A SemanticEntry has a semantic type, extension and intention. The extension is a LambdaCalcExpression, this is a critical object that does the actual semantic calculation. Right now it's a glorified dictionary lookup, but my goal is to change this to a more sophisticated structure.