共查询到20条相似文献,搜索用时 31 毫秒
1.
Open-source machine learning: R meets Weka 总被引:1,自引:0,他引:1
Two of the prime open-source environments available for machine/statistical learning in data mining and knowledge discovery
are the software packages Weka and R which have emerged from the machine learning and statistics communities, respectively. To make the different sets of tools
from both environments available in a single unified system, an R package RWeka is suggested which interfaces Weka’s functionality to R. With only a thin layer of (mostly R) code, a set of general interface generators is provided which can set up interface functions with the usual “R look and feel”, re-using Weka’s standardized interface of learner classes (including classifiers, clusterers, associators, filters, loaders, savers, and
stemmers) with associated methods. 相似文献
2.
V. I. Donskoi 《Journal of Mathematical Sciences》1996,82(3):3468-3471
We describe the “DUEL” expert system, a software package intended for analyzing problem situations and decision making in
medical, economic, engineering, and other systems, based on modern information technology, the introduction of knowledge and
data bases, and deductive and inductive approaches to the synthesis and justification of decisions. “DUEL” is two inference
machines: a deductive machine that uses the products contained in the knowledge base, and an inductive machine that provides
generalization on the basis of precedents accumulated in the data base.
Translated fromDinamicheskie Sistemy, No. 13, 1994, pp. 93–98. 相似文献
3.
Reverse engineering of program code is the process of constructing a higher level abstraction of an implementation in order
to facilitate the understanding of a system that may be in a “legacy” or “geriatric” state. Changing architectures and improvements
in programming methods, including formal methods in software development and object-oriented programming, have prompted a
need to reverse engineer and re-engineer program code. This paper describes the application of the strongest postcondition
predicate transformer (sp) as the formal basis for the reverse engineering of imperative program code.
This work is supported in part by the National Science Foundation grants CCR-9407318, CCR-9209873, and CDA-9312389.
This author is supported in part by a NASA Graduate Student Researchers Program Fellowship. 相似文献
4.
Modern statistical data analysis often requires powerful computers. Parallel computing is a technique to realize such a computer
system. Although many “low-level” software technologies for parallel computing have been developed, they are not easy to use
for statisticians who are accustomed to “high-level” statistical languages. In this paper, we describe high-level parallel
computing functions in a statistical analysis system called Jasp. We implemented them mainly considering ease of use. 相似文献
5.
János D. Pintér 《Central European Journal of Operations Research》2008,16(2):165-178
Integrated computing systems—such as Maple, Mathematica, and MATLAB—enable the development of “live” electronic documents
that include explanatory text, calculations, custom programming (code development), visualization, and other features. As
a result, teachers and students, researchers and practitioners can develop applications in a completely interactive format.
Such e-documents can be put to good use in developing textbooks, lecture notes, assignments and presentations, as well as
in the context of research and development (R&D) projects. The interactive approach accelerates and enhances the process of
learning and research. To illustrate this approach, we discuss a nonlinear (global and local) optimization software product
and a topical electronic book that support interactive model development and optimization in Maple. We highlight the key features
of the e-book and the software, present illustrative examples, and point towards a range of scientific and engineering applications.
相似文献
6.
We introduce the wedge product of two polytopes. The wedge product is described in terms of inequality systems, in terms of
vertex coordinates as well as purely combinatorially, from the corresponding data of its constituents. The wedge product construction
can be described as an iterated “subdirect product” as introduced by McMullen (Discrete Math 14:347–358, 1976); it is dual
to the “wreath product” construction of Joswig and Lutz (J Combinatorial Theor A 110:193–216, 2005). One particular instance
of the wedge product construction turns out to be especially interesting: The wedge products of polygons with simplices contain
certain combinatorially regular polyhedral surfaces as subcomplexes. These generalize known classes of surfaces “of unusually
large genus” that first appeared in works by Coxeter (Proc London Math Soc 43:33–62, 1937), Ringel (Abh Math Seminar Univ
Hamburg 20:10–19, 1956), and McMullen et al. (Israel J Math 46:127–144, 1983). Via “projections of deformed wedge products”
we obtain realizations of some of the surfaces in the boundary complexes of 4-polytopes, and thus in
\mathbb R3{{\mathbb R}^3} . As additional benefits our construction also yields polyhedral subdivisions for the interior and the exterior, as well
as a great number of local deformations (“moduli”) for the surfaces in
\mathbb R3{{\mathbb R}^3} . In order to prove that there are many moduli, we introduce the concept of “affine support sets” in simple polytopes. Finally,
we explain how duality theory for 4-dimensional polytopes can be exploited in order to also realize combinatorially dual surfaces
in
\mathbb R3{{\mathbb R}^3} via dual 4-polytopes. 相似文献
7.
R. F. Bikbaev 《Journal of Mathematical Sciences》1995,77(2):3042-3045
A “non-self-adjoint” integrable MKdV model with boundary conditions of “step-like” type is considered. The time-asymptotic
behavior of the solution for the Cauchy problem is obtained. A similar problem for the dissipative perturbation of this problem
is discussed. Bibliography: 10 titles.
Translated fromZapiski Nauchnykh Seminarov POMI, Vol. 199, 1992, pp. 37–42.
Translated by R. F. Bikbaev. 相似文献
8.
Andrei Yu. Khrennikov Marcus Nilsson 《Proceedings of the Steklov Institute of Mathematics》2009,265(1):140-142
We discuss the similarity of the degeneration structure of the genetic code with a purely number theoretic “divisors code.”
The most interesting thing about our observation is not that there is a connection between number theory and the genetic code,
but the simplicity of the rule. We hope that the observation and the naive model presented in this paper will spur ideas for
other models of the degeneracy of the genetic code. Maybe, the ideas of this article can also be used in the area of artificial
life to synthesize artificial genetic codes. 相似文献
9.
Michael Höhle 《Computational Statistics》2007,22(4):571-582
Public health surveillance of emerging infectious diseases is an essential instrument in the attempt to control and prevent
their spread. This paper presents the R package “surveillance”, which contains functionality to visualise routinely collected
surveillance data and provides algorithms for the statistical detection of aberrations in such univariate or multivariate
time series. For evaluation purposes, the package includes real-world example data and the possibility to generate surveillance
data by simulation. To compare algorithms, benchmark numbers like sensitivity, specificity, and detection delay can be computed
for a set of time series. Package motivation, use and potential are illustrated through a mixture of surveillance theory,
case study and R code snippets. 相似文献
10.
Luke Tierney 《Computational Statistics》2009,24(2):217-223
This paper presents some current work and preliminary thoughts on two seemingly unrelated areas. The first is the development
of code analysis tools to help identify possible errors in R code. Current versions of these tools have been useful in finding
bugs in R’s code as well as code in packages submitted to CRAN. The second area, where work is just beginning, is the development
of mechanisms to allow R’s internal vectorized operations, as well as vectorized operations defined in packages, to take advantage
of multiple processors. These two areas are related through their connections to ongoing efforts to develop a byte code compiler
for R. 相似文献
11.
Shyūichi Izumiya 《manuscripta mathematica》1979,28(4):337-360
In his paper [2], Bierstone proves the equivariant Gromov theorem which is an integrability theorem for “open regularity condition”
of equivariant sections of a smooth G-fibre bundle under the assumption that all orbit bundles of base manifold are non-closed.
Here, we prove the result without his assumption under a nice “open regularity condition” which we call “G-extensible”.
One of the examples of “G-extensible condition” is given by notions of Thom-Boardman singularities. 相似文献
12.
A four-variable distribution on permutations is derived, with two dual combinatorial interpretations. The first one includes
the number of fixed points “fix”, the second the so-called “pix” statistic. This shows that the duality between derangements
and desarrangements can be extended to the case of multivariable statistics. Several specializations are obtained, including
the joint distribution of (des, exc), where “des” and “exc” stand for the number of descents and excedances, respectively.
Authors’ addresses: Dominique Foata, Institut Lothaire, 1 rue Murner, F-67000 Strasbourg, France; Guo-Niu Han, Center for
Combinatorics, LPMC, Nankai University, Tianjin 300071, P.R. China; I.R.M.A. UMR 7501, Université Louis Pasteur et CNRS, 7,
rue René-Descartes, F-67084 Strasbourg, France 相似文献
13.
The Zubarev nonequilibrium statistical operator is used to describe the generalized hydrodynamic state of a magnetic fluid
in an external magnetic field. The magnetic fluid is modeled with “liquid-state” and “magnetic” subsystems described using
the classical and quantum statistics methods respectively. Equations of the generalized statistical hydrodynamics for a magnetic
fluid in a nonhomogeneous external magnetic field with the Heisenberg spin interaction are derived for “liquid-state” and
“magnetic” subsystems characterized by different nonequilibrium temperatures. These equations can be used to describe both
the weakly and strongly nonequilibrium states. Some limiting cases are analyzed in which the variables of one of the subsystems
can be formally neglected.
Translated from Teoreticheskaya i Matematicheskaya Fizika. Vol. 115, No. 1, pp. 132–153, April, 1998. 相似文献
14.
Summary A software system has been developed for the study of dynamic glyph visualizations in the context of Visual Data Mining in
Virtual Reality. The system uses parallel processing to calculate data visualizations in real-time, with real-time interaction
and dynamic changes to the view. The system allows morphing between different visualizations, the use of dynamic features
like “vibrations” and “rotations” of thousands of objects individually, and dynamic visualization, where the influence of
any variable of a dataset with a “reasonable” distribution, can be shown as a dynamic development. It appears that these facilities
for dynamic data visualization have a very promising potential, but their optimal use will depend on further developments
in the context of their individual practical application. 相似文献
15.
Cícero F. Carvalho 《manuscripta mathematica》1999,98(2):155-163
We start this work by studying free linear systems on singular curves and related base point free linear systems on the non-singular
model. We apply these results to the study of pencils of small degree on non-singular curves. We also prove a “base point
free pencil trick” which holds for any (possibly) singular curve.
Received: 15 June 1998 相似文献
16.
In the computational geometry field, simplicial complexes have been used to describe an underlying geometric shape knowing
a point cloud sampled on it. In this article, an adequate statistical framework is first proposed for the choice of a simplicial
complex among a parametrized family. A least-squares penalized criterion is introduced to choose a complex, and a model selection
theorem states how to select the “best” model, from a statistical point of view. This result gives the shape of the penalty,
and then the “slope heuristics method” is used to calibrate the penalty from the data. Some experimental studies on simulated
and real datasets illustrate the method for the selection of graphs and simplicial complexes of dimension two. 相似文献
17.
We prove two related results. The first is an “earthquake theorem” for closed hyperbolic surfaces with cone singularities
where the total angle is less than π: any two such metrics in are connected by a unique left earthquake. The second result
is that the space of “globally hyperbolic” AdS manifolds with “particles” – cone singularities (of given angle) along time-like
lines – is parametrized by the product of two copies of the Teichmüller space with some marked points (corresponding to the
cone singularities). The two statements are proved together.
F.B. was partially supported by the A.N.R. project GEODYCOS. J.-M.S. was partially supported by the A.N.R. programs RepSurf,
2006-09, ANR-06-BLAN-0311, GeomEinstein, 2006-09, 06-BLAN-0154, and FOG, 2007-10, ANR-07-BLAN-0251-01. 相似文献
18.
Alessio Moretti 《Logica Universalis》2009,3(1):19-57
Whereas geometrical oppositions (logical squares and hexagons) have been so far investigated in many fields of modal logic
(both abstract and applied), the oppositional geometrical side of “deontic logic” (the logic of “obligatory”, “forbidden”,
“permitted”, . . .) has rather been neglected. Besides the classical “deontic square” (the deontic counterpart of Aristotle’s
“logical square”), some interesting attempts have nevertheless been made to deepen the geometrical investigation of the deontic
oppositions: Kalinowski (La logique des normes, PUF, Paris, 1972) has proposed a “deontic hexagon” as being the geometrical
representation of standard deontic logic, whereas Joerden (jointly with Hruschka, in Archiv für Rechtsund Sozialphilosophie
73:1, 1987), McNamara (Mind 105:419, 1996) and Wessels (Die gute Samariterin. Zur Struktur der Supererogation, Walter de Gruyter,
Berlin, 2002) have proposed some new “deontic polygons” for dealing with conservative extensions of standard deontic logic
internalising the concept of “supererogation”. Since 2004 a new formal science of the geometrical oppositions inside logic
has appeared, that is “n-opposition theory”, or “NOT”, which relies on the notion of “logical bi-simplex of dimension m” (m = n − 1). This theory has received a complete mathematical foundation in 2008, and since then several extensions. In this paper,
by using it, we show that in standard deontic logic there are in fact many more oppositional deontic figures than Kalinowski’s
unique “hexagon of norms” (more ones, and more complex ones, geometrically speaking: “deontic squares”, “deontic hexagons”,
“deontic cubes”, . . ., “deontic tetraicosahedra”, . . .): the real geometry of the oppositions between deontic modalities
is composed by the aforementioned structures (squares, hexagons, cubes, . . ., tetraicosahedra and hyper-tetraicosahedra),
whose complete mathematical closure happens in fact to be a “deontic 5-dimensional hyper-tetraicosahedron” (an oppositional
very regular solid).
相似文献
19.
Walter J. Gutjahr 《Central European Journal of Operations Research》2006,14(1):59-86
The paper investigates a stochastic model where two agents (persons, companies, institutions, states, software agents or other)
learn interactive behavior in a series of alternating moves. Each agent is assumed to perform “stimulus-response-consequence”
learning, as studied in psychology. In the presented model, the response of one agent to the other agent's move is both the
stimulus for the other agent's next move and part of the consequence for the other agent's previous move. After deriving general
properties of the model, especially concerning convergence to limit cycles, we concentrate on an asymptotic case where the
learning rate tends to zero (“slow learning”). In this case, the dynamics can be described by a system of deterministic differential
equations. For reward structures derived from [2×2] bimatrix games, fixed points are determined, and for the special case
of the prisoner's dilemma, the dynamics is analyzed in more detail on the assumptions that both agents start with the same
or with different reaction probabilities. 相似文献
20.
We prove that certain integers n cannot occur as degrees of linear series without base points on the normalization of a plane
curve whose only singularities are a “small” number of nodes and ordinary cusps. As a consequence we compute the gonality
of such a curve.
Work done with financial support of M.U.R.S.T. while the authors were members of C.N.R. 相似文献