Context Attentive Bandits: Contextual Bandit with Restricted Context

We consider a novel formulation of the multi-armed bandit model, which we call the contextual bandit with restricted context, where only a limited number of features can be accessed by the learner at every iteration. This novel formulation is motivated by different online problems arising in clinical trials, recommender systems and attention modeling. Herein, we adapt the standard multi-armed bandit algorithm known as Thompson Sampling to take advantage of our restricted context setting, and propose two novel algorithms, called the Thompson Sampling with Restricted Context(TSRC) and the Windows Thompson Sampling with Restricted Context(WTSRC), for handling stationary and nonstationary environments, respectively. Our empirical results demonstrate advantages of the proposed approaches on several real-life datasetsComment: IJCAI 201

Food Packaging and Labeling.

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Intercalibration of the Hb3gr 40Ar/39Ar dating standard.

The 40Ar/39Ar dating technique is based on the knowledge of the age of neutron fluence monitors (standards). Recent investigations have improved the accuracy and precision of the ages of most of the Phanerozoic-aged standards (e.g. Fish Canyon Tuff sanidine (FCs), Alder Creek sanidine, GA1550 biotite and LP-6 biotite); however, no specific study has been undertaken on the older standards (i.e. Hb3gr hornblende and NL-25 hornblende) generally used to date Precambrian, high Ca/K, and/or meteoritic rocks.In this study, we show that Hb3gr hornblende is relatively homogenous in age, composition (Ca/K) and atmospheric contamination at the single grain level. The mean standard deviation of the 40Ar/39ArK (F-value) derived from this study is 0.49%, comparable to the most homogeneous standards. The intercalibration factor (which allows direct comparison between standards) between Hb3gr and FCs is RFCsHb3gr = 51.945 0.167. Using an age of 28.02 Ma for FCs, the age of Hb3gr derived from the R-value is 1073.6 5.3 Ma (1σ, internal error only) and 8.8 Ma (including all sources of error). This age is indistinguishable within uncertainty from the K/Ar age previously reported at 1072 11 Ma [Turner G., Huneke, J.C., Podosek, F.A., Wasserburg, G.J., 1971. 40Ar-39Ar ages and cosmic ray exposure ages of Apollo 14 samples. Earth Planet. Sci. Lett. 12, 19-35]. The R-value determined in this study can also be used to intercalibrate FCs if we consider the K/Ar date of 1072 Ma as a reference age for Hb3gr. We derive an age of 27.95 0.19 Ma (1σ, internal error only) for FCs which is in agreement with the previous determinations. Altogether, this shows that Hb3gr is a suitable standard for 40Ar/39Ar geochronology

Is first-gen an identity? How first-generation college students make meaning of institutional and familial constructs of self

Institutions increasingly use first-generation categorizations to provide support to students. In this study, we sought to understand how students make meaning of their first-generation status by conducting a series of focus groups with 54 participants. Our findings reveal that students saw first-generation status as an organizational and familial identity rather than a social identities. This status was connected to alterity and social distance that was most salient in comparison to continuing-generation peers. Our recommendations include re-examining the role of first- generation specific programming on campus, creating opportunities for meaning-making, supporting students within changing family dynamics, and exploring the interaction between first-generation status and other marginalized identities

El Sistema Nacional de Planificación de Ecuador para la garantía de derechos.

Este artículo expone la preocupación del Estado por los derechos de la sociedad y el Buen Vivir, explica como el Sistema Nacional de Planificación de Ecuador se ocupa del desarrollo y las políticas públicas centradas en objetivos que permitan la igualdad y la equidad

La reforma agraria en Panamá

Tesis inédita de la Universidad Complutense de Madrid, Facultad de Derecho, leída en 1973.Fac. de DerechoTRUEProQuestpu

Noisy image restoration using Markov random field in a multiresolution scheme

The restoration methods involving Markov random fields with line process for the discontinuities are known to give good results in edge preserving image restoration . The Markov model is developped on the image decomposed at several resolutions using a wavelet transform . A deterministic relaxation algorithm (GNC) performs the minimization of the non convex criterion . Several multiresolution algorithms are developped and results are compared with those in monoresolution . These multiresolution algorithms provide better results with less computation time .La modélisation de l'image et de ses discontinuités par champ markovien a pour objectif dans la restauration d'image de préserver les contours. Dans cet article l'image est d'abord décomposée à différents niveaux de résolutions par transformée en ondelettes. Un champ markovien est défini pour chaque résolution et l'image est restaurée itérativement en fonction des résolutions croissantes. Cet algorithme est analysé comparativement à un algorithme monorésolution et montre son efficacité en terme de réduction de temps de calcul et qualité de l'image restauré