CMU announces research project to reverse-engineer brain algorithms
CMU is embarking on a 5 year, $12 million project to reverse-engineer the brain and “make computers think more like humans,” funded by the U.S. Intelligence Advanced Research Projects Activity (IARPA); led by Tai Sing Lee from the CS Department and the Center for the Neural Basis of Cognition (CNBC).
The research effort, through IARPA’s Machine Intelligence from Cortical Networks (MICrONS) research program, is part of the U.S. BRAIN Initiative to revolutionize the understanding of the human brain.
“MICrONS is similar in design and scope to the Human Genome Project, which first sequenced and mapped all human genes,” Lee said. “Its impact will likely be long-lasting and promises to be a game changer in neuroscience and artificial intelligence.”
The researchers will attempt to discover the principles and rules the brain’s visual system uses to process information. They believe this deeper understanding could serve as a springboard to revolutionize machine learning algorithms and computer vision.
In particular, the researchers seek to improve the performance of artificial neural networks, computational models for artificial intelligence inspired by the central nervous systems of animals. Interest in neural nets has recently undergone a resurgence thanks to growing computational power and datasets.
Neural nets now are used in a wide variety of applications in which computers can learn to recognize faces, understand speech and handwriting, make decisions for self-driving cars, perform automated trading and detect financial fraud.
“But today’s neural nets use algorithms that were essentially developed in the early 1980s,” Lee said. “Powerful as they are, they still aren’t nearly as efficient or powerful as those used by the human brain. For instance, to learn to recognize an object, a computer might need to be shown thousands of labeled examples and taught in a supervised manner, while a person would require only a handful and might not need supervision.”
To better understand the brain’s connections, Sandra Kuhlman, assistant professor of biological sciences at Carnegie Mellon and the CNBC, will use a technique called “two-photon calcium imaging microscopy” to record signaling of tens of thousands of individual neurons in mice as they process visual information, an unprecedented feat. In the past, only a single neuron, or tens of neurons, typically have been sampled in an experiment, she noted.
“By incorporating molecular sensors to monitor neural activity in combination with sophisticated optical methods, it is now possible to simultaneously track the neural dynamics of most, if not all, of the neurons within a brain region,” Kuhlman said. “As a result we will produce a massive dataset that will give us a detailed picture of how neurons in one region of the visual cortex behave.”
A Harvard-led team, working with investigators at Cold Spring Harbor Laboratory, MIT, and Columbia University, is developing revolutionary techniques to reconstruct the complete circuitry of the neurons recorded at CMU. The database, along with two other databases contributed by other MICrONS teams, unprecedented in scale, will be made publicly available for research groups all over the world.
In this MICrONS project, CMU researchers and their collaborators in other universities will use these massive databases to evaluate a number of computational and learning models as they improve their understanding of the brain’s computational principles and reverse-engineer the data to build better computer algorithms for learning and pattern recognition.
“The hope is that this knowledge will lead to the development of a new generation of machine learning algorithms that will allow AI machines to learn without supervision and from a few examples, which are hallmarks of human intelligence,” Lee said.
The CNBC is a collaborative center between Carnegie Mellon and the University of Pittsburgh. BrainHub is a neuroscience research initiative that brings together the university’s strengths in biology, computer science, psychology, statistics and engineering to foster research on understanding how the structure and activity of the brain give rise to complex behaviors.
The MICrONS team at CMU allso includes Abhinav Gupta, assistant professor of robotics; Gary Miller, professor of computer science; Rob Kass, professor of statistics and machine learning and interim co-director of the CNBC; Byron Yu, associate professor of electrical and computer engineering and biomedical engineering and the CNBC; Steve Chase, assistant professor of biomedical engineering and the CNBC; and Ruslan Salakhutdinov, one of the co-creators of the deep belief network, a new model of machine learning that was inspired by recurrent connections in the brain, who will join CMU as an assistant professor of machine learning in the fall.
Not all machine-intelligence experts are on board with reverse-engineering the brain. In a Facebook post today, Yann LeCun, Director of AI Research at Facebook and a professor at New York University, asked the question in a recent lecture, “Should we copy the brain to build intelligent machines?” “My answer was ‘no, because we need to understand the underlying principles of intelligence to know what to copy. But we should draw inspiration from biology.’”