Natural Logic and Alignment in Natural Language Inference

Опубликовано 6 сентября 2016, 17:45

This is a two-part talk. In the first part, we propose an approach to natural language inference (NLI) based on a model of natural logic, which identifies valid inferences by their lexical and syntactic features, without full semantic interpretation. We greatly extend past work in natural logic, which has focused solely on semantic containment and monotonicity, to incorporate both semantic exclusion and implicativity. Our system decomposes an inference problem into a sequence of atomic edits linking premise to hypothesis; predicts a lexical entailment relation for each edit using a statistical classifier; propagates these relations upward through a syntax tree according to semantic properties of intermediate nodes; and composes the resulting entailment relations across the edit sequence. We evaluate our system on the FraCaS test suite, and achieve a 27 in F1 over a representative NLI aligner and 10.5 over GIZA++.