Conic Multi-Task Classification

Traditionally, Multi-task Learning (MTL) models optimize the average of task-related objective functions, which is an intuitive approach and which we will be referring to as Average MTL. However, a more general framework, referred to as Conic MTL, can be formulated by considering conic combinations of the objective functions instead; in this framework, Average MTL arises as a special case, when all combination coefficients equal 1. Although the advantage of Conic MTL over Average MTL has been shown experimentally in previous works, no theoretical justification has been provided to date. In this paper, we derive a generalization bound for the Conic MTL method, and demonstrate that the tightest bound is not necessarily achieved, when all combination coefficients equal 1; hence, Average MTL may not always be the optimal choice, and it is important to consider Conic MTL. As a byproduct of the generalization bound, it also theoretically explains the good experimental results of previous relevant works. Finally, we propose a new Conic MTL model, whose conic combination coefficients minimize the generalization bound, instead of choosing them heuristically as has been done in previous methods. The rationale and advantage of our model is demonstrated and verified via a series of experiments by comparing with several other methods.Comment: Accepted by European Conference on Machine Learning and Principles and Practice of Knowledge Discovery in Databases (ECMLPKDD)-201

A Treatise on Diversity in a Dominant Culture University

The authors examine progress in strengthening the Diversity agenda in a school of education within a private Christian university. This agenda is informed by external academic accrediting organizations and principles of social justice congruent with the historical roots of the university. Special emphasis is placed on the unique challenges of confronting how privilege manifests itself in seemingly homogeneous environments. The ultimate goal of the authors is to promote moving beyond cosmetic compliance with accreditation obligations towards a metabolized second order change reflecting internal paradigm shifts in which social justice is a central motivating factor in one’s vocation

Does observability affect prosociality?

The observation of behaviour is a key theoretical parameter underlying a number of models of prosociality. However, the empirical findings showing the effect of observability on prosociality are mixed. In this meta-analysis, we explore the boundary conditions that may account for this variability, by exploring key theoretical and methodological moderators of this link. We identified 117 papers yielding 134 study level effects (Total N = 788, 164) and found a small but statistically significant, positive association between observability and prosociality (r = .141, 95% CI = .106, .175). Moderator analysis showed that observability produced stronger effects on prosociality (1) in the presence of passive observers (i.e., people whose role was to only observe participants) vs perceptions of being watched, (2) when participants decisions were consequential (vs non-consequential), (3) when the studies were performed in the laboratory (as opposed to in the field/online), (4) when studies used repeated measures (instead of single games) and (5) when studies involved social dilemmas (instead of bargaining games). These effects show the conditions under which observability effects on prosociality will be maximally observed. We describe the theoretical and practical significance of 14 these results

On the Origins of Dishonesty: From Parents to Children

Acts of dishonesty permeate life. Understanding their origins, and what mechanisms help to attenuate such acts is an underexplored area of research. This study takes an economics approach to explore the propensity of individuals to act dishonestly across different economic environments. We begin by developing a simple model that highlights the channels through which one can increase or decrease dishonest acts. We lend empirical insights into this model by using an experiment that includes both parents and their young children as subjects. We find that the highest level of dishonesty occurs in settings where the parent acts alone and the dishonest act benefits the child rather than the parent. In this spirit, there is also an interesting effect of children on parents' behavior: in the child's presence, parents act more honestly, but there are gender differences. Parents act more dishonestly in front of sons than daughters. This finding has the potential of shedding light on the origins of the widely documented gender differences in cheating behavior observed among adults

On Contracting

Twelve years ago I drew attention in a paper to the importance of the discovery of performative utterances by the well known Oxford linguistic philosopher, John Austin, for a better understanding of the legal concept of contract.\u27 In The Legal Point of View, I developed this concept into what I called the performative function of discourse,2 and in a recent paper I applied it to rebut an attack on the objective theory of contract. 3 My main aim in the present paper is to compare Austin\u27s classification of infelicities, to which performative utterances are subject, with their legal analogues. Although it is unlikely that Lord Denning was familiar with Austin\u27s concept of performative utterances, the recognition of the performative function of discourse lends strong support to his doctrine of equitable mistake. 4 This example shows well how doctrinal development in the law may be strengthened by keeping abreast of developments in philosophy, and how it may be weakened by failing to do so. The philosophical repertoire of most lawyers is usually antiquated, if not quaint. The same is true of the legal repertoire of philosophers. Yet, philosophers on the whole are more willing to learn from lawyers than the other way round. Thus, Austin explicitly acknowledges that the nearest approach to performative is the word operative as used by lawyers, the operative part of a legal instrument being that part which actually performs the legal act which it is the purpose of the instrument to perform. 5 He also refers to contributions made by lawyers in his discussion of infelicities.

Language, Communication, Computers and the Law

There is an old story about a drunken man who is looking for an object under a street light. A policeman asks him what he is looking for. It is my keys , he says. Did you lose them here? No, over there.\u27 Why then are you looking for them over here? Because I can see here , is the man\u27s reply. The real significance of this story is very different from what it appears. It is not the man who is foolish but the policeman. We can only look for something from where we can see it. The alternative is to burrow like moles in the dark. But how can we find something that is not there? We can\u27t of course, but we can get a perspective of it by following a ray of light as far as it will go. There are many lights and many perspectives, but no one absolute objective truth, or any one way of finding it

Rapid field identification of subjects involved in firearm-related crimes based on electroanalysis coupled with advanced chemometric data treatment

We demonstrate a novel system for the detection and discrimination of varying levels of exposure to gunshot residue from subjects in various control scenarios. Our aim is to address the key challenge of minimizing the false positive identification of individuals suspected of discharging a firearm. The chemometric treatment of voltammetric data from different controls using Canonical Variate Analysis (CVA) provides several distinct clusters for each scenario examined. Multiple samples were taken from subjects in controlled tests such as secondary contact with gunshot residue (GSR), loading a firearm, and postdischarge of a firearm. These controls were examined at both bare carbon and gold-modified screen-printed electrodes using different sampling methods: the 'swipe' method with integrated sampling and electroanalysis and a more traditional acid-assisted q-tip swabbing method. The electroanalytical fingerprint of each sample was examined using square-wave voltammetry; the resulting data were preprocessed with Fast Fourier Transform (FFT), followed by CVA treatment. High levels of discrimination were thus achieved in each case over 3 classes of samples (reflecting different levels of involvement), achieving maximum accuracy, sensitivity, and specificity values of 100% employing the leave-one-out validation method. Further validation with the 'jack-knife' technique was performed, and the resulting values were in good agreement with the former method. Additionally, samples from subjects in daily contact with relevant metallic constituents were analyzed to assess possible false positives. This system may serve as a potential method for a portable, field-deployable system aimed at rapidly identifying a subject who has loaded or discharged a firearm to verify involvement in a crime, hence providing law enforcement personnel with an invaluable forensic tool in the field

Crafting Queer Identity, Building Coalitions, and Envisioning Liberation at the Intersections: A Rhetorical Analysis of 1970s Lesbian-Feminist Discourse

This study examines how lesbian-feminists navigated the competing pressures of identity politics and coalition politics and confronted compounding frustrations, divisions, and exclusionary practices throughout the 1970s. Specifically, the study attends to the ways lesbian-feminists rhetorically recalibrated their identities in and through coalitional relationships with such social movement communities as women's liberation, gay liberation, and anti-war activism. In the process, they were able to build coalitional relationships with activists from other movements while retaining a space for articulating and bolstering their lesbian-feminist identities. This study accordingly examines lesbian-feminist published writings and speeches given during conferences, marches, demonstrations, and political rallies between 1970 and 1980 to reveal how they crafted a space for lesbian-feminist politics, identity, and liberation from within coalitional relationships that also marginalized them. The project intersects the theories of public address, social movement rhetoric, intersectionality, identity politics, and coalition politics to examine the strategic interaction between coalition politics and identity politics in lesbian-feminist activism. In particular, recalibration allowed lesbian-feminists to strategically capitalize on intersectionality in order to negotiate the tension between identity creation and coalition formation. Using the rhetorical strategy of pivoting to feature certain aspects of their identities with the various coalitions in mind, lesbian-feminists increased their visibility. They did so not only for the sake of promoting shared political goals and legitimizing lesbian-feminism, but also to confront social movement members on issues of exclusion, homophobia, and sexism. As a result, lesbian-feminism came to hold a variety of meanings for women working in the second-wave women's liberation, gay liberation, and anti-war movements. At times, lesbian feminists upheld a separatist, vanguard ethic, which was defined in opposition to other identities and movements. Though empowering and celebrated by some as more ideologically pure, separatist identity formations remained highly contested at the margins of lesbian-feminist identity politics. With those margins clearly defined, lesbian-feminists strategically pivoted to enact political ideologies and preserve identity from within coalitional relationships. In the process, their discourse revealed a great deal about the relationship between identity politics and coalition politics in the context of U.S. social protest in the post-1960s era

Pornography as a Species of Second-Order Sexual Behaviour. A Submission for Law Reform

The immediate subject-matter of law reform is law, and the immediate reason for reforming the law is dissatisfaction with the law as it is; but the ultimate subject-matter of law reform is the human behaviour contained in a social practice, and the ultimate reason for reforming the law is dissatisfaction with such behaviour. The immediate task of the law reformer is to bring about a change in the legal rules; but his ultimate task is to bring about a change in human behaviour. Hence, law reform ultimately presupposes a set of evaluative standards according to which human behaviour can be evaluated. If the human behaviour leaves nothing to be desired, then the law can be left alone except perhaps to make it more elegant. If, on the other hand, dissatisfaction is felt with the human behaviour, the relevant legal rules must be looked at. Perhaps they can be changed so as to produce the desired human behaviour; perhaps nothing can be done, the case being simply one in which human behaviour will not respond to legal pressure, or the necessary pressure will be so great as to involve more unsatisfactory behaviour than it will be able to cure

From Cosmetic to Metabolized Change: Promoting Paradigm Shifts in a Dominant Culture University

The authors provide three case examples modeling the implementation of the Diversity agenda in a school of education within a private Christian university. The second article in a series, the case studies demonstrate contextual application of confronting privilege as it manifests itself in a seemingly homogeneous environment. As the authors document programmatic, personal, and pedagogical methods informed by principles of social justice and equity, the intent is to move beyond cosmetic compliance with accreditation obligations towards a metabolized second order change within students and faculty