1,384,719 research outputs found
Constraints as Features
In this paper, we introduce a new approach to con-strained clustering which treats the constraints as features. Our method augments the original feature space with ad-ditional dimensions, each of which derived from a given Cannot-link constraints. The specified Cannot-link pair gets extreme coordinates values, and the rest of the points get coordinate values that express their spatial influence from the specified constrained pair. After augmenting all the new features, a standard unconstrained clustering al-gorithm can be performed, like k-means or spectral clus-tering. We demonstrate the efficacy of our method for ac-tive semi-supervised learning applied to image segmenta-tion and compare it to alternative methods. We also eval-uate the performance of our method on the four most com-monly evaluated datasets from the UCI machine learning repository. 1
A constraint-based approach to noun phrase coreference resolution in German newspaper text
In this paper, we investigate the usefulness of a wide range of features for their usefulness in the resolution of nominal coreference, both as hard constraints (i.e. completely removing elements from the list of possible candidates) as well as soft constraints (where a cumulation of violations of soft constraints will make it less likely that a candidate is chosen as the antecedent). We present a state of the art system based on such constraints and weights estimated with a maximum entropy model, using lexical information to resolve cases of coreferent bridging
TEST: A Tropic, Embodied, and Situated Theory of Cognition
TEST is a novel taxonomy of knowledge representations based on three distinct hierarchically organized representational features: Tropism, Embodiment, and Situatedness. Tropic representational features reflect constraints of the physical world on the agentâs ability to form, reactivate, and enrich embodied (i.e., resulting from the agentâs bodily constraints) conceptual representations embedded in situated contexts. The proposed hierarchy entails that representations can, in principle, have tropic features without necessarily having situated and/or embodied features. On the other hand, representations that are situated and/or embodied are likely to be simultaneously tropic. Hence while we propose tropism as the most general term, the hierarchical relationship between embodiment and situatedness is more on a par, such that the dominance of one component over the other relies on the distinction between offline storage vs. online generation as well as on representation-specific properties
The configuration multi-edge model: Assessing the effect of fixing node strengths on weighted network magnitudes
Complex networks grow subject to structural constraints which affect their
measurable properties. Assessing the effect that such constraints impose on
their observables is thus a crucial aspect to be taken into account in their
analysis. To this end,we examine the effect of fixing the strength sequence in
multi-edge networks on several network observables such as degrees, disparity,
average neighbor properties and weight distribution using an ensemble approach.
We provide a general method to calculate any desired weighted network metric
and we show that several features detected in real data could be explained
solely by structural constraints. We thus justify the need of analytical null
models to be used as basis to assess the relevance of features found in real
data represented in weighted network form.Comment: 11 pages. 4 figure
Quantum canonical tensor model and an exact wave function
Tensor models in various forms are being studied as models of quantum
gravity. Among them the canonical tensor model has a canonical pair of
rank-three tensors as dynamical variables, and is a pure constraint system with
first-class constraints. The Poisson algebra of the first-class constraints has
structure functions, and provides an algebraically consistent way of
discretizing the Dirac first-class constraint algebra for general relativity.
This paper successfully formulates the Wheeler-DeWitt scheme of quantization of
the canonical tensor model; the ordering of operators in the constraints is
determined without ambiguity by imposing Hermiticity and covariance on the
constraints, and the commutation algebra of constraints takes essentially the
same from as the classical Poisson algebra, i.e. is first-class. Thus one could
consistently obtain, at least locally in the configuration space, wave
functions of "universe" by solving the partial differential equations
representing the constraints, i.e. the Wheeler-DeWitt equations for the quantum
canonical tensor model. The unique wave function for the simplest non-trivial
case is exactly and globally obtained. Although this case is far from being
realistic, the wave function has a few physically interesting features; it
shows that locality is favored, and that there exists a locus of configurations
with features of beginning of universe.Comment: 17 pages. Section 2 expanded to include fuzzy-space interpretation,
and other minor change
Collider limits on new physics within micrOMEGAs4.3
Results from the LHC put severe constraints on models of new physics. This
includes constraints on the Higgs sector from the precise measurement of the
mass and couplings of the 125GeV Higgs boson, as well as limits from searches
for other new particles. We present the procedure to use these constraints in
micrOMEGAs by interfacing it to the external codes Lilith, HiggsSignals,
HiggsBounds and SModelS. A few dedicated modules are also provided. With these
new features, micrOMEGAs_4.3 provides a generic framework for evaluating dark
matter observables together with collider and non-collider constraints.Comment: 23 page
Selection, tinkering and emergence in complex networks: crossing the land of tinkering
Complex biological networks have very different origins than technologic ones. The latter involve extensive design and, as engineered structures, include a high level of optimization. The former involve (in principle) contingency and structural constraints, with new structures being incorporated through tinkering with previously evolved modules or units. However, the observation of the topological features of different biological nets suggests that nature can have a limited repertoire of âattractorsâ that essentially optimize communication under some basic constraints of cost and architecture or that allow the biological nets to reach a high degree of homeostasis. Conversely, the topological features exhibited by some technology graphs indicate that tinkering and internal constraints play a key role, in spite of the âdesignedâ nature of these structures. Previous scenarios suggested to explain the overall trends of evolution are re-analyzed in light of topological patterns.Peer ReviewedPostprint (author's final draft
Making Performance Funding Work for All
Outlines models, design features, and challenges of performance funding, or linking public investment in higher education to institutional outcomes, as a way to address state budget constraints, raise attainment, and strengthen public higher education
On Incomplete XML Documents with Integrity Constraints
Abstract. We consider incomplete specifications of XML documents in the presence of schema information and integrity constraints. We show that integrity constraints such as keys and foreign keys affect consistency of such specifications. We prove that the consistency problem for incomplete specifications with keys and foreign keys can always be solved in NP. We then show a dichotomy result, classifying the complexity of the problem as NP-complete or PTIME, depending on the precise set of features used in incomplete descriptions.
- âŠ