UW Today

September 21, 2015

AI system solves SAT geometry questions as well as average human test taker

News and Information

SAT photo Aaron Escobar, flickr

Aaron Escobar, flickr

The Allen Institute for Artificial Intelligence (AI2) and University of Washington researchers have created an artificial intelligence (AI) system that can solve SAT geometry questions as well as the average American 11th-grade student, a breakthrough in AI research.

This system, called GeoS, uses a combination of computer vision to interpret diagrams, natural language processing to read and understand text and a geometric solver to achieve 49 percent accuracy on official SAT test questions. If these results were extrapolated to the entire Math SAT test, the computer roughly achieved an SAT score of 500 (out of 800), the average test score for 2015.

A paper outlining the research, “Solving Geometry Problems: Combining Text and Diagram Interpretation,” was a joint effort between the UW Computer Science & Engineering department and AI2.

These results, presented at the 2015 Conference on Empirical Methods in Natural Language Processing (EMNLP) in Lisbon, Portugal, were achieved by GeoS solving unaltered SAT questions that it had never seen before and that required an understanding of:

* Implicit relationships

* Ambiguous references

* The relationships between diagrams and natural-language text

“Unlike the Turing Test, standardized tests such as the SAT provide us today with a way to measure a machine’s ability to reason and to compare its abilities with that of a human,” said Oren Etzioni, CEO of AI2. “Much of what we understand from text and graphics is not explicitly stated, and requires far more knowledge than we appreciate. Creating a system to be able to successfully take these tests is challenging, and we are proud to achieve these unprecedented results.”

Said Ali Farhadi, senior research manager for Vision at AI2 and UW assistant professor of computer science and engineering, “We are excited about GeoS’s performance on real-world tasks. Our biggest challenge was converting the question to a computer-understandable language. One needs to go beyond standard pattern-matching approaches for problems like solving geometry questions that require in-depth understanding of text, diagram and reasoning.”

How GeoS Works

GeoS is the first end-to-end system that solves SAT plane geometry problems. It does this by first interpreting a geometry question by using the diagram and text in concert to generate the best possible logical expressions of the problem, which it sends to a geometric solver to solve. Then it compares that answer to the multiple-choice answers for that question.

A demonstration of the system’s problem-solving is available here.

This process is complicated by the fact that SAT questions contain many unstated assumptions.


AI2/University of Washington

For example, in the SAT problem at right, there are several unstated assumptions, such as the fact that lines BD and AC intersect at E, that “circle O has a radius of 5” is the same as “circle O radius equals 5” and that the drawing may or may not be to scale.

GeoS had a 96 percent accuracy rate on questions it was confident enough to answer, which is an important dimension of learning. Today, GeoS can solve plane geometry questions; AI2 is moving to solve the full set of SAT math questions in the next three years.

As part of AI2’s commitment to sharing its research for the common good, all data sets and software are available for other researchers to use.

AI2 is also building systems that can tackle science tests, which require a knowledge base that includes elements of the unstated, common-sense knowledge that humans generate over their lives. This Aristo project is described here.

Co-authors include lead author Minjoon Seo, a UW computer science and engineering doctoral student, UW electrical engineering assistant research professor Hannaneh Hajishirzi, and former UW undergraduate student Clint Malcolm.

About AI2

AI2 was founded in 2014 with the singular focus of conducting high-impact research and engineering in the field of artificial intelligence, all for the common good. AI2 is the creation of Paul Allen, Microsoft cofounder, and is led by Dr. Oren Etzioni, a renowned researcher in the field of AI. AI2 employs more than 35 top-notch researchers and engineers, attracting individuals of varied interests and backgrounds from across the globe. AI2 prides itself on the diversity and collaboration of this team, and takes a results-oriented approach to complex challenges in AI.

About University of Washington Computer Science & Engineering (UW CSE):

UW CSE educates tomorrow’s innovators, conducts high-impact research, transfers new discoveries to society and creates opportunities for faculty and students to push the boundaries of a rapidly expanding field while developing solutions to humanity’s greatest challenges.

For more information, contact Hamilton McCulloh at 206-957-4260 or hamiltonm@greenrubino.com or Jennifer Langston at 206-543-2580 or jlangst@uw.edu.