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Causal Compression [article]

Aleksander Wieczorek, Volker Roth
2016 arXiv   pre-print
We propose a new method of discovering causal relationships in temporal data based on the notion of causal compression. To this end, we adopt the Pearlian graph setting and the directed information as an information theoretic tool for quantifying causality. We introduce chain rule for directed information and use it to motivate causal sparsity. We show two applications of the proposed method: causal time series segmentation which selects time points capturing the incoming and outgoing causal
more » ... w between time points belonging to different signals, and causal bipartite graph recovery. We prove that modelling of causality in the adopted set-up only requires estimating the copula density of the data distribution and thus does not depend on its marginals. We evaluate the method on time resolved gene expression data.
arXiv:1611.00261v1 fatcat:mi7srojlbjftvh6y7egiwgv7va

Identities of Rothe-Abel- Schläfli-Hurwitz-type

Volker Strehl
1992 Discrete Mathematics  
., Identities of Rothes-Abel-Schlafli-Hurwitz-type, Discrete Mathematics 99 (1992) 321-340.  ...  By specialization of the parameters one can find many of the known generalizations or variations of Abel's generalization of the binomial theorem, including those obtained by Rothe, Schlafli, and Hurwitz  ...  It is certainly older than Abel's work, because it appears as a special case of an identity by Rothe [35] in 1793, see [13-B] , and Section 3.3.  ... 
doi:10.1016/0012-365x(92)90379-t fatcat:3h6h4fgojvbtlota2zkmgidn4i

Georg Herwegh, Werke und Briefe. Kritische und kommentierte Gesamtausgabe. Hg. von Ingrid Pepperle in Verbindung mit Volker Giel, Heinz Pepperle, Norbert Rothe, Hendrik Stein. Bd. 1: Gedichte 1835–1848. Bearbeitet von Volker Giel. Bd. 5: Briefe 1832–1848. Bearbeitet von Ingrid Pepperle. Mitarbeit Heinz Pepperle, Norbert Rothe, Hendrik Stein. Bd. 6: Briefe 1849–1875. Bearbeitet von Ingrid Pepperle und Heinz Pepperle. Mitarbeit Norbert Rothe, Hendrik Stein. Aisthesis, Bielefeld 2005–2010

Walter Hettche
2011 Arbitrium  
Zum Dichter sei er nicht berufen gewesen, hat Friedrich Sengle über Georg Herwegh geurteilt; er sei nichts weiter als "ein sich überschätzender Spezialist für politische Lyrik". 1 Mit dieser Einschätzung steht Sengle in der westdeutschen Germanistik keineswegs allein. In der DDR dagegen feierte man Herwegh als einen der führenden revolutionären Schriftsteller, und gerne hätte Ingrid Pepperle dort schon vor Jahrzehnten eine Herwegh-Gesamtausgabe vorgelegt. Die von der Akademie der Wissenschaften
more » ... der DDR geplante historisch-kritische Edition der Werke und Briefe konnte jedoch nicht realisiert werden, denn ein großer Teil des Nachlasses liegt im Herwegh-Archiv im schweizerischen Liestal, für Forscher aus der DDR also nahezu unerreichbar. Wer sich wissenschaftlich mit dem Autor beschäftigen wollte, musste entweder auf die Originalausgaben zurückgreifen oder die 1909 erschienene Edition von Hermann Tardel in der Reihe der Bong'schen Klassiker-Ausgaben benutzen. Die schmale Ausgabe in der "Bibliothek deutscher Klassiker" des Aufbau-Verlags, besorgt von Hans-Georg Werner, ist keine eigenständige editorische Leistung, sondern folgt Tardels Edition. Die neue, auf sechs Bände angelegte "Kritische und kommentierte Gesamtausgabe" ist die erste, die Herweghs Nachlass und sämtliche in anderen Archiven und Privatsammlungen verstreuten Materialen auswertet, wodurch sich der Textbestand gegenüber der Ausgabe von Tardel vervierfacht hat. Das ist nicht nur für die Herwegh-Forschung (wenn es sie denn gibt) ein unschätzbarer Gewinn, sondern für die wissenschaftliche Beschäftigung mit dem Vormärz insgesamt. Vor allem in den Briefbänden ist der Zuwachs beträchtlich; von den rund 650 überlieferten Briefen Herweghs war die Hälfte bisher unveröffentlicht. Hier sind besonders die Briefe an den österreichischen Schriftsteller Adolf Kolatschek (1821-1889) hervorzuheben (vgl. Bd. 6, S. 522). Zu Herweghs Briefpartnern zählt alles, was um diese Zeit Rang und Namen hat, Ludwig Feuerbach und Heinrich Heine, Franz Liszt und Gottfried Keller, Richard Wagner und Ferdinand Lassalle. Die weitaus meisten Briefe sind allerdings an die Ehefrau Emma Herwegh gerichtet. Bedauerlich ist, dass die Briefe an Herwegh nicht in die Ausgabe aufgenommen worden sind.
doi:10.1515/arbi.2011.053 fatcat:awyxmxtpgvg6xeo6rma5fe7xhq

Ueber die rothe Färbung der Manganoxydulsalze

A. Völker
1846 Justus Liebig s Annalen der Chemie  
~, die in kleitier BSenge farblos und nur in Blasae betrachtet schwiich roth gefarbt erscheinen.  ...  XIV; 336) erhilt iitan beim Gliihen von Braunstein niit rauchentlern Vitrioliil das rothe, niit englisclieni das farblose Saiz.  ... 
doi:10.1002/jlac.18460590104 fatcat:37wo5mdu5rampmlef2oj7orlfm

Projecting on China-German Enlightenment and Volker Braun's "Great Peace"

Hansjörg Rothe
2013 Chinese Studies  
The report argues that Volker Braun's play is an important document of German-Chinese intercultural dialogue, and proposes the project of making a translated version available for the dialogue.  ...  highlighting the role China played in the discussions of Protestantism and early enlightenment in Germany around 1700, and how this crucial phase may be re-interpreted from the standpoint of the 1980ies, when Volker  ...  ROTHE converts.  ... 
doi:10.4236/chnstd.2013.21007 fatcat:5zim443mf5bn7f77uk6ipuoi4e

Sparse Kernel Regressors [chapter]

Volker Roth
2001 Lecture Notes in Computer Science  
Sparse kernel regressors have become popular by applying the support vector method to regression problems. Although this approach has been shown to exhibit excellent generalization properties in many experiments, it suffers from several drawbacks: the absence of probabilistic outputs, the restriction to Mercer kernels, and the steep growth of the number of support vectors with increasing size of the training set. In this paper we present a new class of kernel regressors that effectively
more » ... the above problems. We call this new approach generalized LASSO regression. It has a clear probabilistic interpretation, produces extremely sparse solutions, can handle learning sets that are corrupted by outliers, and is capable of dealing with large-scale problems.
doi:10.1007/3-540-44668-0_48 fatcat:qkh7wkd52vhy7kwy2id7praqne

Deep Archetypal Analysis [article]

Sebastian Mathias Keller, Maxim Samarin, Mario Wieser, Volker Roth
2020 arXiv   pre-print
"Deep Archetypal Analysis" generates latent representations of high-dimensional datasets in terms of fractions of intuitively understandable basic entities called archetypes. The proposed method is an extension of linear "Archetypal Analysis" (AA), an unsupervised method to represent multivariate data points as sparse convex combinations of extremal elements of the dataset. Unlike the original formulation of AA, "Deep AA" can also handle side information and provides the ability for data-driven
more » ... representation learning which reduces the dependence on expert knowledge. Our method is motivated by studies of evolutionary trade-offs in biology where archetypes are species highly adapted to a single task. Along these lines, we demonstrate that "Deep AA" also lends itself to the supervised exploration of chemical space, marking a distinct starting point for de novo molecular design. In the unsupervised setting we show how "Deep AA" is used on CelebA to identify archetypal faces. These can then be superimposed in order to generate new faces which inherit dominant traits of the archetypes they are based on.
arXiv:1901.10799v2 fatcat:nhckkcnzqfbbfjz33zmkskynnm

Titelei/Inhaltsverzeichnis [chapter]

Volker Lingnau, Gordon Müller-Seitz, Stefan Roth
2017 Management der digitalen Transformation  
Das Erstellen und Weitergeben von Kopien dieses PDFs ist nicht zulässig. von Volker Lingnau Gordon Müller-Seitz Stefan Roth Verlag Franz Vahlen München Geleitwort Kaiserslautern zu einem national  ... 
doi:10.15358/9783800655410-i fatcat:hzew76uwnrbhfguwqumm5jdyve

Information Theoretic Causal Effect Quantification

Aleksander Wieczorek, Volker Roth
2019 Entropy  
Modelling causal relationships has become popular across various disciplines. Most common frameworks for causality are the Pearlian causal directed acyclic graphs (DAGs) and the Neyman-Rubin potential outcome framework. In this paper, we propose an information theoretic framework for causal effect quantification. To this end, we formulate a two step causal deduction procedure in the Pearl and Rubin frameworks and introduce its equivalent which uses information theoretic terms only. The first
more » ... p of the procedure consists of ensuring no confounding or finding an adjustment set with directed information. In the second step, the causal effect is quantified. We subsequently unify previous definitions of directed information present in the literature and clarify the confusion surrounding them. We also motivate using chain graphs for directed information in time series and extend our approach to chain graphs. The proposed approach serves as a translation between causality modelling and information theory.
doi:10.3390/e21100975 fatcat:ttkyrefhdvclzeuqtpuru4o2yi

Bayesian Markov Blanket Estimation [article]

Dinu Kaufmann, Sonali Parbhoo, Aleksander Wieczorek, Sebastian Keller, David Adametz, Volker Roth
2015 arXiv   pre-print
This paper considers a Bayesian view for estimating a sub-network in a Markov random field. The sub-network corresponds to the Markov blanket of a set of query variables, where the set of potential neighbours here is big. We factorize the posterior such that the Markov blanket is conditionally independent of the network of the potential neighbours. By exploiting this blockwise decoupling, we derive analytic expressions for posterior conditionals. Subsequently, we develop an inference scheme
more » ... h makes use of the factorization. As a result, estimation of a sub-network is possible without inferring an entire network. Since the resulting Gibbs sampler scales linearly with the number of variables, it can handle relatively large neighbourhoods. The proposed scheme results in faster convergence and superior mixing of the Markov chain than existing Bayesian network estimation techniques.
arXiv:1510.01485v1 fatcat:ag4ajtddmbecfbk5rplncu3d5a

Empowering Mobile Software Agents [chapter]

Volker Roth
2002 Lecture Notes in Computer Science  
Recent work has shown that several cryptographic protocols for the protection of free-roaming mobile agents are vulnerable by means of protocol interleaving attacks. This paper presents equivalent protocols meant to be robust against this type of attack. Moreover, it describes the required processes and data structures at a level of detail that can be translated to an implementation in a straightforward way. Our aim is to demonstrate how cryptographic processing can be implemented transparently
more » ... for agent programmers, thereby reducing the risks of human error in (secure) mobile agent programming. Keywords: mobile agent security, malicious host, protocol interleaving attack, applied cryptography. of one or more protocol executions by an adversary itself." Figure 1 illustrates how interleaving attacks may be mounted in the domain of mobile agents: the adversary receives an agent, and copies protocol data back and forth between this agent and agents she sent herself.
doi:10.1007/3-540-36112-x_4 fatcat:dlhtyfowonbc3leh274kqwv3hq

Das Bild der Gerechtigkeit im Rechtsbuch des Johannes Rothe/Johannes Purgoldt und seine Tradition [chapter]

Volker Honemann, Henrike Lähnemann, Sandra Linden
2009 Dichtung und Didaxe  
Volker Honemann Das Bild der Gerechtigkeit im Rechtsbuch des Johannes Rothe / Johannes Purgoldt und seine Tradition Das Rechtsbuch des Eisenacher Stadtschreibers (bezeugt als solcher 1490-1534) Johannes  ...  Purgoldt stellte sein Rechtsbuch in den Jahren 1503 / 04 auf der Basis der um 1400 entstandenen Rechtsbücher seines Amtsvorgängers Johannes Rothe (gest. 1434) zusammen. 1 Von den insgesamt zwölf Büchern  ...  Jurid. 2407 (früher Ms. 198; entstanden zwischen 1523 und 1529), den Ortloff für seine Ausgabe verwendete, ist noch immer verschollen, siehe Volker Honemann, Purgoldt, Johannes (Anm. 1) 917.  ... 
doi:10.1515/9783110218992.469 fatcat:enwu25x7rbewllboqbc53depte

Adachi, Nobuko: Ethnic Capital in a Japanese Brazilian Commune

Joshua Hotaka Roth
2018 Anthropos: Internationale Zeitschrift für Völker- und Sprachenkunde  
Joshua Hotaka Roth Adda, Ferdaouss, Korinna Klasing und Mark Münzel (Hrsg.): Ethnologen zwischen Beruf und Berufung. Tätigkeitsfelder und praktische Tipps zur Orientierung.  ... 
doi:10.5771/0257-9774-2018-1-269 fatcat:23z5eayhyjcjthkhfgr23whvbu

Inverse Learning of Symmetries [article]

Mario Wieser, Sonali Parbhoo, Aleksander Wieczorek, Volker Roth
2020 arXiv   pre-print
Symmetry transformations induce invariances which are frequently described with deep latent variable models. In many complex domains, such as the chemical space, invariances can be observed, yet the corresponding symmetry transformation cannot be formulated analytically. We propose to learn the symmetry transformation with a model consisting of two latent subspaces, where the first subspace captures the target and the second subspace the remaining invariant information. Our approach is based on
more » ... the deep information bottleneck in combination with a continuous mutual information regulariser. Unlike previous methods, we focus on the challenging task of minimising mutual information in continuous domains. To this end, we base the calculation of mutual information on correlation matrices in combination with a bijective variable transformation. Extensive experiments demonstrate that our model outperforms state-of-the-art methods on artificial and molecular datasets.
arXiv:2002.02782v2 fatcat:o2u4wdqkkrdudgeervkobx6sle

Kernel Fisher Discriminants for Outlier Detection

Volker Roth
2006 Neural Computation  
Instead of an SVM, however, a kernel Fisher discriminant (KFD) classifier is used (Mika, Rätsch, Weston, Sch ölkopf, & M üller, 1999; Roth & Steinhage, 2000) .  ... 
doi:10.1162/neco.2006.18.4.942 pmid:16494696 fatcat:a4tv7bk5rrhmtcjcqgmaxewmdy
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