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A scalable generative topographic mapping for sparse data sequences

A scalable generative topographic mapping for sparse data se...

引用

International conference on Information Technology: Coding and Computing (ITCC)

作者： A. Kaban School of Computer Science University of Binningham Birmingham UK

We propose a novel, computationally efficient generative topographic model for inferring low dimensional representations of high dimensional data sets, designed to exploit data sparseness. The associated parameter estimation algorithm scales linearly with the number of nonzero entries in the observations while still learning a truly nonlinear generative mapping. The latent variables of the model lie in a 2D space that can be used for visualisation. We discuss related work and we provide experimental results on text based documents visualisation as well as the exploratory analysis of Web navigation sequences.

关键词： Parameter estimation data visualization Histograms Predictive models Gold Character generation Computer science Electronic mail Navigation data mining

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COTS cluster-based sort-last rendering: performance evaluation and pipelined implementation

COTS cluster-based sort-last rendering: performance evaluati...

引用

IEEE conference on visualization

作者： X. Cavin C. Mion A. Filbois Inria Lorraine Inria Lorraine France

Sort-last parallel rendering is an efficient technique to visualize huge datasets on COTS clusters. The dataset is subdivided and distributed across the cluster nodes. For every frame, each node renders a full resolution image of its data using its local GPU, and the images are composited together using a parallel image compositing algorithm. In this paper, we present a performance evaluation of standard sort-last parallel rendering methods and of the different improvements proposed in the literature. This evaluation is based on a detailed analysis of the different hardware and software components. We present a new implementation of sort-last rendering that fully overlaps CPU(s), GPU and network usage all along the algorithm. We present experiments on a 3 years old 32-node PC cluster and on a 1.5 years old 5-node PC cluster, both with Gigabit interconnect, showing volume rendering at respectively 13 and 31 frames per second and polygon rendering at respectively 8 and 17 frames per second on a 1024 x 768 render area, and we show that our implementation outperforms or equals many other implementations and specialized visualization clusters.

关键词： Rendering (computer graphics) Clustering algorithms Hardware visualization Computer graphics Image resolution Computer networks Concurrent computing Distributed computing Computed tomography

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Historical recall and precision: summarizing generated hypotheses

Historical recall and precision: summarizing generated hypot...

引用

International conference on Document analysis and Recognition

作者： R. Zanibbi D. Blostein J.R. Cordy Centre for Pattern Recognition and Machine Intelligence Concordia University Montreal Canada School of Computing Queen's University Kingston Canada

Document recognition involves many kinds of hypotheses: segmentation hypotheses, classification hypotheses, spatial relationship hypotheses, and so on. Many recognition strategies generate valid hypotheses, which are eventually rejected, but current evaluation methods consider only accepted hypotheses. As a result, we have no way to measure errors associated with rejecting valid hypotheses. We propose describing hypothesis generation in more detail, by collecting the complete set of generated hypotheses and computing the recall and precision of this set: we call these the 'historical recall' and 'historical precision.' Using table cell detection examples, we demonstrate how historical recall and precision along with the complete set of generated hypotheses assist in the evaluation, debugging, and design of recognition strategies.

关键词： Books History Debugging Pattern recognition Machine intelligence Information analysis Decision making data structures data visualization Text analysis

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Improving 2D scatterplots effectiveness through sampling, displacement, and user perception

Improving 2D scatterplots effectiveness through sampling, di...

引用

International conference on Information Visualisation (IV)

作者： E. Bertini G. Santucci Dipartimento di Informatica e Sistemistica Università di Roma La Sapienza Rome Italy

In this paper we present a novel, hybrid, and automatic strategy whose goal is to reduce the 2D scatter plot cluttering. The presented technique relies on a combination of nonuniform sampling and pixel displacement and it is driven by perceptual results coming from a suitable user study. The same results are used to define precise quality metrics that allow for validating our approach.

关键词： Scattering Sampling methods Image sampling data visualization Degradation Extraterrestrial measurements Remuneration Merging data analysis Density measurement

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Extracting Critical Path Graphs from MPI Applications

Extracting Critical Path Graphs from MPI Applications

引用

IEEE International conference on Cluster Computing

作者： Martin Schulz Center for Applied Scientific Computing Lawrence Livemore National Laboratory USA

The critical path is one of the fundamental runtime characteristics of a parallel program. It identifies the longest execution sequence without wait delays. In other words, the critical path is the global execution path that inflicts wait operations on other nodes without itself being stalled. Hence, it dictates the overall runtime and knowing it is important to understand an application's runtime and message behavior and to target optimizations. We have developed a toolset that identifies the critical path of MPI applications, extracts it, and then produces a graphical representation of the corresponding program execution graph to visualize it. To implement this, we intercept all MPI library calls, use the information to build the relevant subset of the execution graph, and then extract the critical path from there. We have applied our technique to several scientific benchmarks and successfully produced critical path diagrams for applications running on up to 128 processors

关键词： Runtime data visualization Laboratories Delay data mining Libraries Performance analysis Scientific computing Contracts Scalability

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Visualising sentiments in financial texts?

Visualising sentiments in financial texts?

引用

International conference on Information Visualisation (IV)

作者： K. Ahmad Y. Almas Department of Computing University of Surrey Guildford Surrey UK

An information extraction system that extracts 'sentiment' words in unrestricted Arabic texts is described. Earlier work on the automatic sentiment analysis in English and Chinese texts has been adapted and extended to the morphologically richer Arabic texts. A method for automatically and unambiguously extracting sentiment-bearing patterns from texts in Arabic is described. A list of sentiment words is provided and sentiment bearing excerpts are extracted from time-stamped news wire: The frequency of sentiment words per unit time is then plotted for 'visualising' changes in sentiments.

关键词： visualization data mining Speech Instruments Frequency Wire Natural languages Performance analysis Computer crashes Finance

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Region-position 3D labeling algorithm for three dimensional analysis of cells

Region-position 3D labeling algorithm for three dimensional ...

引用

International conference on e-health Networking, Applications and Services (HealthCom)

作者： Hong Jae Kim Hyun Cho Heung Kook Choi School of Computer Engineering Inje University Gimhae South Korea Department of Hearthcare Management Inje University Gimhae South Korea

ISBN: (纸本)0780389409

In this paper, we have proposed a region-position 3D labeling algorithm for a three dimension analysis of cells in a histological tissue. A cell in a tissue section contains much information about diseases. This information is very important in the diagnosis and the treatment of diseases. However, we can find a seriously problem during to get the information of cell analysis based on a two-dimensional image. This problem can lead to removing artifacts the size or the diameter of depending on the angle of the physical sectioning etc. And it is difficult to get the correct analysis because we don't know the three-dimensional shape of cells. Therefore, we need to the three-dimensional data of cells. From these volumetric data some three-dimensional features could be quantified. And three-dimensional visualization could be created. It is a method that purposed a 3D labeling which consists of several steps as follows. The first step is a detecting the region-position of all objects in a two-dimensional image. Secondly, the 3D object creates to the amount of object numbers in a slice. Thirdly, an interconnection makes by using region-position of before and after object in the two-dimensional images. Finally, if it has been interconnected the object creates a new 3D object. In the proposed a 3D labeling algorithm could be reduced the time-complexity and we believe that our method could become a useful method of 3D labeling.

关键词： Labeling Algorithm design and analysis Image analysis data visualization Optical microscopy Engineering management Cardiac disease Cardiovascular diseases Information analysis Shape

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Hardware-accelerated simulated radiography

Hardware-accelerated simulated radiography

引用

IEEE conference on visualization

作者： D. Laney S.P. Callahan N. Max C.T. Silva S. Langer R. Frank Lawrence Livemore National Laboratory USA University of Utah USA Computational Engineering International

We present the application of hardware accelerated volume rendering algorithms to the simulation of radiographs as an aid to scientists designing experiments, validating simulation codes, and understanding experimental data. The techniques presented take advantage of 32-bit floating point texture capabilities to obtain solutions to the radiative transport equation for X-rays. The hardware accelerated solutions are accurate enough to enable scientists to explore the experimental design space with greater efficiency than the methods currently in use. An unsorted hexahedron projection algorithm is presented for curvilinear hexahedral meshes that produces simulated radiographs in the absorption-only regime. A sorted tetrahedral projection algorithm is presented that simulates radiographs of emissive materials. We apply the tetrahedral projection algorithm to the simulation of experimental diagnostics for inertial confinement fusion experiments on a laser at the University of Rochester.

关键词： Projection algorithms Hardware Acceleration Diagnostic radiography Algorithm design and analysis Equations X-rays Design for experiments Optical materials Inertial confinement

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Visualisation and analysis of network motifs

Visualisation and analysis of network motifs

引用

International conference on Information Visualisation (IV)

作者： Weidong Huang C. Murray Xiaobin Shen Le Song Ying Xin Wu Lanbo Zheng NICTA University of Sydney Australia

Many of the complex networks that occur both in nature and in technology are built up from frequently recurring patterns of basic structural elements. These structural patterns known as motifs play a significant role in the function of the network. Visualisation is a useful tool for understanding the structure in a network. The quality of a visualisation can be significantly improved if it effectively displays these motifs. In this paper we present visualisations designed to highlight motifs detected through analysis. We argue that these visualisations designed to show functionally important subgraphs give a greater insight into the function of the network.

关键词： Transfer functions Performance analysis Complex networks Displays data visualization Pattern analysis Social network services Biological materials Electronic circuits Web sites

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Discovering recurring anomalies in text reports regarding complex space systems

Discovering recurring anomalies in text reports regarding co...

引用

IEEE conference on Aerospace

作者： A.N. Srivastava B. Zane-Ulman NASA Ames Research Center USA Computer Sciences Corporation NASA Ames Research Center

Many existing complex space systems have a significant amount of historical maintenance and problem data bases that are stored in unstructured text forms. The problem that we address in this paper is the discovery of recurring anomalies and relationships between problem reports that may indicate larger systemic problems. We illustrate our techniques on data from discrepancy reports regarding software anomalies in the Space Shuttle. These free text reports are written by a number of different people, thus the emphasis and wording vary considerably. We test four automatic methods of anomaly detection in text that are popular in the current literature on text mining. The first method that we describe is k-means or Gaussian mixture model and its application to the term-document matrix. The second method is the Sammon nonlinear map, which projects high dimensional document vectors into two dimensions for visualization and clustering purposes. The third method is based on an analysis of the results of applying a clustering method, expectation maximization on a mixture of von Mises Fisher distributions that represents each document as a point on a high dimensional sphere. In this space, we perform clustering to obtain sets of similar documents. The results are derived from a new method known as spectral clustering, where vectors from the term-document matrix are embedded in a high dimensional space for clustering. The paper concludes with recommendations regarding the development of an operational text mining system for analysis of problem reports that arise from complex space systems. We also contrast such systems with general purpose text mining systems, illustrating the areas in which this system needs to be specified for the space domain

关键词： data mining Information analysis Aerospace testing Text mining Functional analysis data analysis Sensor systems Thermal sensors Manufacturing processes Algorithm design and analysis

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