Construction, manipulation, and comparison of a multi-dimensional semantic space
View Patent ↗A directed set can be used to establish contexts for linguistic concepts: for example, to aid in answering a question, to refine a query, or even to determine what questions can be answered given certain knowledge. A directed set includes a plurality of elements and chains relating the concepts. One concept is identified as a maximal element. The chains connect the maximal element to each concept in the directed set, and more than one chain can connect the maximal element to any individual concept either directly or through one or more intermediate concepts. A subset of the chains is selected to form a basis for the directed set. Each concept in the directed set is measured to determine how concretely each chain in the basis represents it. These measurements for a single concept form a vector in Euclidean k-space. Distances between these vectors can be used to determine how closely related pairs of concepts are in the directed set.
1. A method for a user of a computer system to find a context to aid in answering a question, the method comprising:
identifying a plurality of concepts to form a directed set, wherein one concept is a maximal element;
establishing directed links between pairs of concepts in the directed set, the directed links defining “is a” relationships between the concepts in the pairs of concepts, so that each concept is either a source or a sink of at least one directed link;
parsing the question into two or more parsed concepts;
establishing one or more chains in the directed set, wherein each chain is rooted at the maximal element in the directed set and extends to a concept from the plurality of concepts in the directed set, and for each pair of concepts in each chain, one of the pair of concepts is a lineal ancestor of the other of the pair of concepts;
creating a distance vector for the one or more parsed concepts in the directed set, wherein each distance vector includes as its components the measure of how concretely the concept is represented in each chain;
measuring a distance between the distance vectors for each pair of parsed concepts; and
using the distances between the one or more parsed concepts to establish a context for the question.
2. A method for using a lexicon to submit a refined query input by a user to a query engine, the refined query method comprising:
identifying a plurality of concepts to form the lexicon, wherein one concept is a maximal element;
establishing directed links between pairs of concepts in the lexicon, the directed links defining “is a” relationships between the concepts in the pairs of concepts, so that each concept is either a source or a sink of at least one directed link;
parsing a query into one or more parsed concepts represented in the lexicon;
establishing chains in the lexicon from the maximal element to each other concept, where for each pair of concepts in each chain, one of the pair of concepts is a lineal ancestor of the other of the pair of concepts;
measuring how concretely each concept is represented in each chain;
measuring distances in the lexicon between the one or more parsed concepts using how concretely each concept is represented in each chain;
using the distances between the one or more parsed concepts to establish a context for the query;
refining the query according to the context for the query; and
submitting the refined query to the query engine.