Multi-Task Learning tries to improve the learning process of different tasks by solving them simultaneously. A popular Multi-Task Learning formulation for SVM is to combine common and task-specific parts. Other approaches rely on using a Graph Laplacian regularizer. Here we propose a combination of these two approaches that can be applied to L1, L2 and LS-SVMs. We also propose an algorithm to iteratively learn the graph adjacency matrix used in the Laplacian regularization. We test our proposal with synthetic and real (...) problems, both in regression and classification settings. When the task structure is present, we show that our model is able to detect it, which leads to better results, and we also show it to be competitive even when this structure is not present. (shrink)

In lieu of an abstract, here is a brief excerpt of the content:Academic Skepticism in Early Modern PhilosophyJosé R. Maia NetoAncient skepticism was more influential in the sixteenth and seventeenth centuries than it had ever been before. Thanks to the groundwork of Charles B. Schmitt and Richard H. Popkin on the influence of ancient skepticism in early modern philosophy and to the extensive research that followed their lead, skepticism is now recognized as having played a major role in the rise (...) of modern thought. 1There were two ancient skeptical schools, Academic skepticism and Pyrrhon-ism. Were both equally influential? Until the sixteenth century, Pyrrhonism was scarcely known. Only a few copies of Sextus’s books (the only surviving primary source of ancient Pyrrhonism) have been discovered in medieval libraries. By contrast the main source of Academic skepticism, Cicero’s Aca-demica, was occasionally referred to by medieval authors and was the object of some commentaries and criticism in the Renaissance. 2 Academic skepticism was preserved from the Middle Ages to the Renaissance not only through Cicero’s Academica, but also through Lactantius’s Divinae Institutiones and [End Page 199] Augustine’s Contra Academicos. 3 This situation changed when Sextus’s works were translated to latin and published in 1562 and 1569. Sextus presents a much more complete and detailed account and defense of ancient skepticism than that of Cicero’s Academica. Sextus presents Pyrrhonism as a coherent form of skepticism and Academic skepticism as a kind of negative dogmatism. 4 It was thus natural that the ancient skepticism that fascinated some (and troubled so many) early modern thinkers was mostly Pyrrhonian. Because of the publication of Sextus’s works, according to Schmitt, the increasing influence of Cicero’s Academica in the Renaissance was halted. Sextus’s Hypotyposes and Adversus Mathematicos took the place of Cicero’s Academica and drastically increased the influence of ancient skepticism. 5 The skeptical crisis at the dawn of modern philosophy is called “pyrrhonienne” not “academicienne.”While the appearance of Sextus’s works in Latin turned him and Pyrrhonism into the main source and influence of ancient skepticism in early modern philosophy, further research on the history of skepticism in the period has shown that the role of Cicero’s Academica and of Academic skepticism in general continued to be considerable. First, Cicero’s works were important items in the university curricula. Although Cicero’s works of rhetoric and morals were those more read, the students could certainly learn about Academic skepticism through at least some of them. Second, many editions of De Natura Deorum, a work of Cicero’s in which Academic skepticism is quite central, were published during the seventeenth century. Third, features of Academic skepticism, exhibited above all in Cicero’s Academica, are basic to the skepticism revived in the late Renaissance by Montaigne and Charron; were related to the new science in the first half of the seventeenth century by Gassendi; were used in the anti-Cartesian reaction of the late seventeenth century by Rapin, Huet, Bayle, and above all Foucher; and were radicalized in the eighteenth century by Hume. Despite the Academic features of Montaigne’s, Charron’s, and Gassendi’s skepticisms, it does seem that from the publication of Sextus’s works to the mid-seventeenth century, Academic skepticism was secondary to Pyrrhonism. But the appearance of Descartes and the development of Cartesianism in the second half of the seventeenth century set conditions for a complete revamping of Academic skepticism, bringing about what Schmitt thought was precluded by the appearance of Sextus in the modern scene, namely, a “full flowering of the Academica as a work to inspire new directions of philosophical thought.” 6 [End Page 200]Montaigne’s Apologie pour Raimond Sebond is rightly considered the first major result of the revival of ancient Pyrrhonism in modern thought. 7 Montaigne never cites the name of Sextus nor acknowledges his source and, by contrast, fills his Apology with passages from Cicero on the Academic skeptics. It is clear, however, that Montaigne follows closely Sextus’s Outlines of Pyrrhonism in the central part of the Apology where he gives a detailed and sympathetic exposition of ancient skepticism.After dwelling on the evils and problems arising from knowledge and science, Montaigne... (shrink)

In lieu of an abstract, here is a brief excerpt of the content:Hume and Pascal: Pyrrhonism vs. Nature José R. Maia Neto The view that Pyrrhonism is not practically viable was, according to Richard H. Popkin, held during the seventeenth and eighteenth centuriesbydifferent philosophers suchas Mersenne,Arnauld, Pascal, Ramsay, and others.1 Among the anti-sceptics, this position was usually taken as an argument against Pyrrhonism. Popkin points out that Hume's main contribution to the "Pyrrhonian controversy" is to show that (i) "the (...) Pyrrhonian doctrine was the logical outcome of philosophical analysis,"2 (ii) that the infeasibility of Pyrrhonism does not weaken its epistemological force but only its psychological plausibility, and (Ui) that this implausibility obtains because nature (the common affairs ofeveryday life and the feeUngs, impressions, and ideas thereby generated) impels the philosopher to believe.3 Popkin alsomakes an allusion to the similaritybetweenHume and Pascal on this issue.4 In this paper I compare the dilemma posed by Pascal as apropaedeutic tofaith withthe "dangerous dilemma" alluded to, but avoided, by Hume in the conclusion of book 1 of the Treatise. The dilemma follows from (i) above. At a certain point in his epistemological enquiry the philosopher is forced tomake a hard choice between the quite disadvantageous alternatives: either to continue his philosophizing, which, leading to Pyrrhonism, may bring despair and cause the annihilation ofhis life, or to abandon philosophy, makinghim aprey ofthe "errors, absurdities, andobscurities"ofanon-critical life.5 In what follows I compare Hume's solution to this dilemma with Pascal's.? In the following passage Hume shows the toughness of the dilemma and offers a first answer to it: What party, then, shall we choose among these difficulties? If we... condemn all refin'd reasoning, we run into the most manifest absurdities. If we reject it in favour of these reasonings, we subvert entirely the human understanding. We have, therefore, no choice left but betwixt a false reason and none at all. For my part, I know not what ought to be done Volume XVII Number 1 41 JOSE R.???? NETO in the present case. I can only observe what is commonly done; which is, that this difficulty is seldom or never thought of; and even where it has once been present to the mind, is quickly forgot, and leaves but a small impression behind it. (T 268) Note that in this first answer Hume manages to avoid the normative response that the dilemma demands. He provides, instead, a descriptive account which is a kind of solution because it purports to show that human psychology makes it unlikely that someone could reach the point at which he or she would have to choose between the two parties. The dilemma does not arise because nature stops the self-subversion ofreason. Most fortunately it happens, that since reason is incapable of dispelling these clouds, nature herselfsuffices to that purpose, and cures me of this philosophical melancholy and delirium, either by relaxing this bent ofmind, or by some avocation, and lively impression of my senses, which obliterate all these chimeras. (T 269) Hume means by nature in this passage both human nature and the social and natural environments which, in so far as they demand specific reactions, generate appropriate beliefs. Those beliefs imposed by nature are necessaryforour survival. So, the mere interaction ofthe philosopher with the world outside his closet suffices to dispel his sceptical crisis. According to Hume, this determination of nature is absolute and necessary. "I find myself absolutely and necessarily determin'd to live... I may, nay I must yield to the current ofnature" (T 269). This view is reaffirmed in the Enquiry. Nature is always too strong for principle. And though a PYRRHONIAN may throw himself or others into a momentary amazement and confusion by his profound reasonings; the first and most trivial event in life will put to flight all his doubts and scruples, and leave him the same, in every point ofaction and speculation, with the philosophers of every other sect, or with those who never concerned themselves in any philosophical researches.6 So, it would appear that the dilemma is just a fleeting impression in the imagination of the philosopher during a momentary sceptical crisis. Nature provides that such a crisis is not prolonged... (shrink)

Volume 19, Issue 11, November 2019, Page 1-8.

This book is the first systematic account of Pierre Charron's influence among the major French philosophers in the period (1601-1662). It shows that Charron's Wisdom was one of the main sources of inspiration of Pierre Gassendi's first published book, the Exercitationes adversus aristoteleos. It sheds new light on La Mothe Le Vayer, who is usually viewed as a major free thinker. By showing that he was a follower of Charron, La Mothe emerges neither as a skeptical apologist nor as a (...) disguised libertine, as combatting superstition but not as irreligious. The book shows the close presence of Charron in the preambles of Descartes' philosophy and that the cogito is mainly based on the moral Academic self-assurance of Charron's wise man. This interpretation reverses the standard view of Descartes' relation to skepticism. Once this skepticism is recognized to be Charron's Academic one, it is seen not as the target but as the source of the cogito. Pascal is the last major philosopher for whom Charron's wisdom is crucially relevant. Montaigne and Descartes influenced, respectively, Pascal's view of the Pyrrhonian skeptic and of the skeptical main arguments. The book shows that Charron's Academic skeptical wise man is one of the main targets of his projected apology for Christianity, since he considered him as a threat and counter-example of the kind of Christian view of human beings he believed. By restoring the historical philosophical relevance of Charron in early modern philosophy and arguing for the relevance of Academic skepticism in the period, this book opens a new research program to early modern scholars and will be valuable for those interested in the history of philosophy, French literature and religion. (shrink)

This article examines the conception of scepticism during the early modern period. It describes how the writings of Pierre Charron and Michel de Montaigne inspired authors to search for a balance between extreme scepticism and what was often described as the dogmatism of the Schools. It discusses the revival of scepticism in the Renaissance and early seventeenth-century philosophy and shows the impact of Cartesian doubt in late seventeenth- and early eighteenth-century scepticism.

This paper has two sections. In the first one I examine Pascal's appropriation in La 131 of the Cartesian argument of the deceiver God. Pascal develops a skeptical reading of the argument in order to use it as a premise for his apologetic argument of true religion. In the second section I examine Huet's appropriation of this same Cartesian argument in his Philosophical Treatise on the Weakness of Human Understanding. Based on this work of Huet's and on his margin notes (...) on Pascal's Thoughts, I show that his skeptical reading of the argument is derived from Pascal's, although Huet's and Pascal's goals are distinct: while the latter intends to provide an argument for the Fall of Man, the former intends to show the weakness of reason unassisted by supernatural faith. (shrink)

A reconstrução racional do programa de pesquisa do racionalismo clássico sob a perspectiva da abordagem de solução de problemas.

I present two criticisms: (1) Merge is a model of performance in speech perception experiments but not an ecologically valid model integrating both word recognition and speech perception, and (2) Merge's implementation of the variability of lexical effects must be made more precise or the model is indistinguishable from its alternatives.

Montaigne faz um ataque pirrônico ao conceito acadêmico de verossimilhança ou probabilidade na Apologia de Raymond Sebond. O ataque é paradoxal porque Montaigne parece seguir o verossímil na própria Apologia e em diversos outros ensaios. Para resolver este problema exegético proponho uma dupla restrição do escopo do ataque à verossimilhança. Por um lado, mostro que o ataque visa mais a leitura epistêmica da verossimilhança proposta por Filo de Larissa do que ao conceito original de ordem exclusivamente prática de Carnéades. Por (...) outro, situo-o em um contexto político-religioso bem específico. O ataque pirrônico à verossimilhança é a estratégia oferecida por Montaigne à rainha católica de Navarra e irmã do rei da França, Marguerite de Valois, para eventual uso nas polêmicas religiosas em sua corte majoritariamente protestante de Nérac. Esta contextualização soluciona também outros problemas exegéticos da Apologia, como o da defesa paradoxal de Sebond, a inconsistência aparente entre as respostas de Montaigne às duas objeções feitas ao livro de Sebond, e o problema do fideísmo. In the Apology for Raymond Sebond, Montaigne launches a Pyrrhonian attack on Academic probability. However, Montaigne does follow probability in the Apology and other essays. In order to solve this exegetical problem I propose a double restriction of the attack. On the one hand, I show that it aims at Philo of Larissa's epistemic interpretation of the doctrine rather than at Carneades' original practical conception. On the other hand, I place the attack on a very specific historical context. Montaigne's Pyrrhonian attack on probability is a polemical strategy offered to Marguerite de Valois, the sister of the catholic king of France and wife of the protestant leader Henri de Navarre, to be used in the religious controversies in her predominant protestant court at Nérac. This context also solves other exegetical problems of the Apology such as Montaigne's paradoxical defense of Sebond, the apparent contradiction between the replies to the two objections to Sebond's book addressed by Montaigne, and the problem of fideism. (shrink)

In lieu of an abstract, here is a brief excerpt of the content:Hume and Pascal: Pyrrhonism vs. Nature José R. Maia Neto The view that Pyrrhonism is not practically viable was, according to Richard H. Popkin, held during the seventeenth and eighteenth centuriesbydifferent philosophers suchas Mersenne,Arnauld, Pascal, Ramsay, and others.1 Among the anti-sceptics, this position was usually taken as an argument against Pyrrhonism. Popkin points out that Hume's main contribution to the "Pyrrhonian controversy" is to show that (i) "the (...) Pyrrhonian doctrine was the logical outcome of philosophical analysis,"2 (ii) that the infeasibility of Pyrrhonism does not weaken its epistemological force but only its psychological plausibility, and (Ui) that this implausibility obtains because nature (the common affairs ofeveryday life and the feeUngs, impressions, and ideas thereby generated) impels the philosopher to believe.3 Popkin alsomakes an allusion to the similaritybetweenHume and Pascal on this issue.4 In this paper I compare the dilemma posed by Pascal as apropaedeutic tofaith withthe "dangerous dilemma" alluded to, but avoided, by Hume in the conclusion of book 1 of the Treatise. The dilemma follows from (i) above. At a certain point in his epistemological enquiry the philosopher is forced tomake a hard choice between the quite disadvantageous alternatives: either to continue his philosophizing, which, leading to Pyrrhonism, may bring despair and cause the annihilation ofhis life, or to abandon philosophy, makinghim aprey ofthe "errors, absurdities, andobscurities"ofanon-critical life.5 In what follows I compare Hume's solution to this dilemma with Pascal's.? In the following passage Hume shows the toughness of the dilemma and offers a first answer to it: What party, then, shall we choose among these difficulties? If we... condemn all refin'd reasoning, we run into the most manifest absurdities. If we reject it in favour of these reasonings, we subvert entirely the human understanding. We have, therefore, no choice left but betwixt a false reason and none at all. For my part, I know not what ought to be done Volume XVII Number 1 41 JOSE R.???? NETO in the present case. I can only observe what is commonly done; which is, that this difficulty is seldom or never thought of; and even where it has once been present to the mind, is quickly forgot, and leaves but a small impression behind it. (T 268) Note that in this first answer Hume manages to avoid the normative response that the dilemma demands. He provides, instead, a descriptive account which is a kind of solution because it purports to show that human psychology makes it unlikely that someone could reach the point at which he or she would have to choose between the two parties. The dilemma does not arise because nature stops the self-subversion ofreason. Most fortunately it happens, that since reason is incapable of dispelling these clouds, nature herselfsuffices to that purpose, and cures me of this philosophical melancholy and delirium, either by relaxing this bent ofmind, or by some avocation, and lively impression of my senses, which obliterate all these chimeras. (T 269) Hume means by nature in this passage both human nature and the social and natural environments which, in so far as they demand specific reactions, generate appropriate beliefs. Those beliefs imposed by nature are necessaryforour survival. So, the mere interaction ofthe philosopher with the world outside his closet suffices to dispel his sceptical crisis. According to Hume, this determination of nature is absolute and necessary. "I find myself absolutely and necessarily determin'd to live... I may, nay I must yield to the current ofnature" (T 269). This view is reaffirmed in the Enquiry. Nature is always too strong for principle. And though a PYRRHONIAN may throw himself or others into a momentary amazement and confusion by his profound reasonings; the first and most trivial event in life will put to flight all his doubts and scruples, and leave him the same, in every point ofaction and speculation, with the philosophers of every other sect, or with those who never concerned themselves in any philosophical researches.6 So, it would appear that the dilemma is just a fleeting impression in the imagination of the philosopher during a momentary sceptical crisis. Nature provides that such a crisis is not prolonged... (shrink)

ABSTRACT In section XII of the First Inquiry, Hume refers to the two Hellenistic schools of skepticism to present his own view of skepticism, which, however, depends on the ancient skeptics mainly indirectly. Hume's view of skepticism depends crucially on Descartes and post-Cartesian philosophers such as Pascal, Huet, Foucher and Bayle, who reacted skeptically to major Cartesian doctrines but followed one version or other of Descartes's methodical doubt. Although all these post-Cartesian philosophers are relevant in section XII, I focus on (...) the topics in which Descartes himself-besides his skeptical followers-seems directly relevant. After an introductory section on Julia Annas' and Richard Popkin's views of Hume's relation to, respectively, ancient and modern skepticism, I turn to section XII and examine what Hume calls "consequent skepticism about the senses," "antecedent skepticism," and "Academic skepticism." RESUMO Na seção XII da Primeira Investigação, Hume refere-se a duas escolas céticas antigas ao apresentar sua própria visão do ceticismo que, entretanto, depende do ceticismo antigo somente secundária e indiretamente. A compreensão humiana do ceticismo depende principalmente de Descartes e de filósofos pós-cartesianos como Pascal, Huet, Foucher e Bayle que reagiram ceticamente às principais doutrinas cartesianas, mas seguiram uma versão ou outra da dúvida metódica de Descartes. Embora todos estes filósofos sejam relevantes na seção XII, examinarei os tópicos da seção nos quais Descartes parece ser diretamente visado. Após uma seção introdutória sobre as leituras de Julia Annas e Richard Popkin da relação de Hume com, respectivamente, o ceticismo antigo e o moderno, examino o que Hume chama na seção XII da Investigação de "ceticismo consequente sobre os sentidos", "ceticismo antecedente" e "ceticismo acadêmico". (shrink)

Fall detection is a challenging task that has received the attention of the research community in the recent years. This study focuses on FD using data gathered from wearable devices with tri-axial accelerometers, developing a solution centered in elderly people living autonomously. This research includes three different ways to improve a FD method: an analysis of the event detection stage, comparing several alternatives, an evaluation of features to extract for each detected event and an appraisal of up to 6 different (...) clustering scenarios to split the samples in subsets that might enhance the classification. For each clustering scenario, a specific classification stage is defined. The experimentation includes publicly available simulated fall data sets. Results show the guidelines for defining a more robust and efficient FD method for on-wrist 3DACC wearable devices. (shrink)