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Clustering data by identifying a subset of representative examples is important for processing sensory signals and detecting patterns in data. Such "exemplars" can be found by randomly choosing an initial subset of data points and then iteratively refining it, but this works well only if that initial choice is close to a good solution. We devised a method(More)
Unsupervised categorization of images or image parts is often needed for image and video summarization or as a preprocessing step in supervised methods for classification, tracking and segmentation. While many metric-based techniques have been applied to this problem in the vision community , often, the most natural measures of similarity (e.g., number of(More)
2009 Clustering data by identifying a subset of representative examples is important for detecting patterns in data and in processing sensory signals. Such " exemplars " can be found by randomly choosing an initial subset of data points as exemplars and then iteratively refining it, but this works well only if that initial choice is close to a good(More)
MOTIVATION We address the problem of multi-way clustering of microarray data using a generative model. Our algorithm, probabilistic sparse matrix factorization (PSMF), is a probabilistic extension of a previous hard-decision algorithm for this problem. PSMF allows for varying levels of sensor noise in the data, uncertainty in the hidden prototypes used to(More)
Effective visualization of biological data is often critical for subsequent analysis. The popular clustergram/dendrogram visualization rearranges rows and columns of a data matrix so as to highlight clusters of similar responses, but assumes each row or column belongs to only one cluster and cannot associate each row or column with multiple clusters. Such(More)
Many kinds of data can be viewed as consisting of a set of vectors, each of which is a noisy combination of a small number of noisy prototype vectors. Physically, these prototype vectors may correspond to different hidden variables that play a role in determining the measured data. For example, a gene's expression is influenced by the presence of(More)
Common sense dictates that as Internet connection speeds increase, so too does the bandwidth of commonly transmitted data. Presumably, this means that today's Internet of text and images will evolve into an Internet with high-quality video conforming to the MPEG standard. This report begins by introducing MPEG, the MPEG-2 standard, and providing a(More)