Technology
Four key takeaways from Apple's change of leadership
The new Apple chief faces major geopolitical challenges such as diversifying the supply chain away from China. The new Apple chief faces major geopolitical challenges such as diversifying the supply chain away from China. John Ternus takes over from Tim Cook as chief executive of Apple in September. A company insider, Ternus is moving up from his role as head of engineering to take control of the entire $4tn (£3tn) business. Apple is a vast, successful tech company and one of the most recognised brands in the world.
People keep trespassing near cave filled with bats infected by Ebola's cousin
Environment Animals Wildlife Bats People keep trespassing near cave filled with bats infected by Ebola's cousin The Marburg virus disease can reach a nearly 90 percent mortality rate. More information Adding us as a Preferred Source in Google by using this link indicates that you would like to see more of our content in Google News results. Epidemiologists believe the Marburg virus disease is primarily transmitted to humans through Egyptian fruit bats. Breakthroughs, discoveries, and DIY tips sent six days a week. You do not want to contract Marburg virus disease (MVD).
Long-term Causal Effects via Behavioral Game Theory
Panagiotis Toulis, David C. Parkes
Planned experiments are the gold standard in reliably comparing the causal effect of switching from a baseline policy to a new policy. One critical shortcoming of classical experimental methods, however, is that they typically do not take into account the dynamic nature of response to policy changes. For instance, in an experiment where we seek to understand the effects of a new ad pricing policy on auction revenue, agents may adapt their bidding in response to the experimental pricing changes. Thus, causal effects of the new pricing policy after such adaptation period, the long-term causal effects, are not captured by the classical methodology even though they clearly are more indicative of the value of the new policy. Here, we formalize a framework to define and estimate long-term causal effects of policy changes in multiagent economies. Central to our approach is behavioral game theory, which we leverage to formulate the ignorability assumptions that are necessary for causal inference. Under such assumptions we estimate long-term causal effects through a latent space approach, where a behavioral model of how agents act conditional on their latent behaviors is combined with a temporal model of how behaviors evolve over time.
Adversarial Multiclass Classification: A Risk Minimization Perspective
Rizal Fathony, Anqi Liu, Kaiser Asif, Brian Ziebart
Recently proposed adversarial classification methods have shown promising results for cost sensitive and multivariate losses. In contrast with empirical risk minimization (ERM) methods, which use convex surrogate losses to approximate the desired non-convex target loss function, adversarial methods minimize non-convex losses by treating the properties of the training data as being uncertain and worst case within a minimax game. Despite this difference in formulation, we recast adversarial classification under zero-one loss as an ERM method with a novel prescribed loss function. We demonstrate a number of theoretical and practical advantages over the very closely related hinge loss ERM methods. This establishes adversarial classification under the zero-one loss as a method that fills the long standing gap in multiclass hinge loss classification, simultaneously guaranteeing Fisher consistency and universal consistency, while also providing dual parameter sparsity and high accuracy predictions in practice.