Computer Science and Artificial Intelligence Lab (CSAIL): Recent submissions
Now showing items 1541-1560 of 2625
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Permutation Tests for Classification
(2003-08-28)We introduce and explore an approach to estimating statistical significance of classification accuracy, which is particularly useful in scientific applications of machine learning where high dimensionality of the data and ...
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Near-Optimal Distributed Failure Circumscription
(2003-08-11)Small failures should only disrupt a small part of a network. One way to do this is by marking the surrounding area as untrustworthy --- circumscribing the failure. This can be done with a distributed algorithm using ...
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Delegation, Arbitration and High-Level Service Discovery as Key Elements of a Software Infrastructure for Pervasive Computing
(2003-06-01)The dream of pervasive computing is slowly becoming a reality. A number of projects around the world are constantly contributing ideas and solutions that are bound to change the way we interact with our environments and ...
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Activity Zones for Context-Aware Computing
(2003-06-10)Location is a primary cue in many context-aware computing systems, and is often represented as a global coordinate, room number, or Euclidean distance various landmarks. A user?s concept of location, however, is often ...
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Learning Classes Correlated to a Hierarchy
(2003-05-01)Trees are a common way of organizing large amounts of information by placing items with similar characteristics near one another in the tree. We introduce a classification problem where a given tree structure gives us ...
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The Essential Dynamics Algorithm: Essential Results
(2003-05-01)This paper presents a novel algorithm for learning in a class of stochastic Markov decision processes (MDPs) with continuous state and action spaces that trades speed for accuracy. A transform of the stochastic MDP ...
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A Robust Amorphous Hierarchy from Persistent Nodes
(2003-05-01)For a very large network deployed in space with only nearby nodes able to talk to each other, we want to do tasks like robust routing and data storage. One way to organize the network is via a hierarchy, but hierarchies ...
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Light Field Morphable Models
(2003-04-18)Statistical shape and texture appearance models are powerful image representations, but previously had been restricted to 2D or simple 3D shapes. In this paper we present a novel 3D morphable model based on image-based ...
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Fast Pose Estimation with Parameter Sensitive Hashing
(2003-04-18)Example-based methods are effective for parameter estimation problems when the underlying system is simple or the dimensionality of the input is low. For complex and high-dimensional problems such as pose estimation, ...
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Inferring 3D Structure with a Statistical Image-Based Shape Model
(2003-04-17)We present an image-based approach to infer 3D structure parameters using a probabilistic "shape+structure'' model. The 3D shape of a class of objects may be represented by sets of contours from silhouette views ...
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Surviving the Information Explosion: How People Find Their Electronic Information
(2003-04-15)We report on a study of how people look for information within email, files, and the Web. When locating a document or searching for a specific answer, people relied on their contextual knowledge of their information target ...
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Persistent Nodes for Reliable Memory in Geographically Local Networks
(2003-04-15)A Persistent Node is a redundant distributed mechanism for storing a key/value pair reliably in a geographically local network. In this paper, I develop a method of establishing Persistent Nodes in an amorphous matrix. I ...
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Context-Based Vision System for Place and Object Recognition
(2003-03-19)While navigating in an environment, a vision system has to be able to recognize where it is and what the main objects in the scene are. In this paper we present a context-based vision system for place and object ...
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Leveraging Learning and Language Via Communication Bootstrapping
(2003-03-17)In a Communication Bootstrapping system, peer components with different perceptual worlds invent symbols and syntax based on correlations between their percepts. I propose that Communication Bootstrapping can also be ...
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(Semi-)Predictive Discretization During Model Selection
(2003-02-25)In this paper, we present an approach to discretizing multivariate continuous data while learning the structure of a graphical model. We derive the joint scoring function from the principle of predictive accuracy, which ...
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Generalized Low-Rank Approximations
(2003-01-15)We study the frequent problem of approximating a target matrix with a matrix of lower rank. We provide a simple and efficient (EM) algorithm for solving {\\em weighted} low rank approximation problems, which, unlike simple ...
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The Role of Programming in the Formulation of Ideas
(2002-11-01)Classical mechanics is deceptively simple. It is surprisingly easy to get the right answer with fallacious reasoning or without real understanding. To address this problem we use computational techniques to communicate ...
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Swimming in Space-Time
(2002-11-01)Cyclic changes in the shape of a quasi-rigid body on a curved manifold can lead to net translation and/or rotation of the body in the manifold. Presuming space-time is a curved manifold as portrayed by general relativity, ...
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Multiple Resolution Image Classification
(2002-12-01)Binary image classifiction is a problem that has received much attention in recent years. In this paper we evaluate a selection of popular techniques in an effort to find a feature set/ classifier combination which ...
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Shape Recipes: Scene Representations that Refer to the Image
(2002-09-01)The goal of low-level vision is to estimate an underlying scene, given an observed image. Real-world scenes (e.g., albedos or shapes) can be very complex, conventionally requiring high dimensional representations which ...