Imprecision is inherent in any decidable (sound) approximation of undecidable program properties. In abstract interpretation this corresponds to the release of false alarms, e.g., when it is used for program analysis and program verification. As all alarming systems, a program analysis tool is credible when few false alarms are reported.…
Formally describing the specification of a programming language is a challenging task. Specifications that use imperative features, such as state or exceptions, or that manipulate continuations are very difficult to describe in usual operational semantics, such as natural semantics or SOS.In addition, these descriptions are not objects that can be…
Symbolic execution is a program analysis technique commonly utilized to determine whether programs violate properties and, in case violations are found, to generate inputs that can trigger them. Used in the context of security properties such as noninterference, symbolic execution is precise when looking for counter-example pairs of traces when insecure information…
We propose a systematic approach to approximate the behavior of models of polymers synthesis/degradation, described in Kappa. Our abstraction consists in focusing on the behavior of all the patterns of size less than a given parameter. We infer symbolic equalities and inequalities which intentionally may be understood as algebraic constructions…
In this talk, we will discuss a symbolic representation for support vector machines (SVMs) by means of abstract interpretation. We leverage this abstraction in two ways: (1) to enhance the interpretability of SVMs by deriving a novel feature importance measure called abstract feature importance (AFI), that does not depend in any way on a given dataset of…
Separation logic-based shape analyses aim to infer properties of heap manipulating programs. These analyses abstract the heap using separation logic including inductive summarizing predicates. Whereas they have been successfully applied to prove properties of data structures layout, they usually abstract away some properties of the data structures contents. As a…
Probabilistic programming languages aim at designing and implementing algorithms that compute over probability distributions rather than states. They feature dedicated primitives for sampling and conditioning. Moreover, the evaluation of probabilistic programs relies on general purpose inference engines. In the last few years, several languages such as Pyro, Edward or Stan…
Asynchronous code is remarkably hard to get right, making it a common source of errors in TypeScript code. However, we would not be able to write TypeScript applications without it, because it enables long-running actions without freezing the current view. Developers usually rely on manual inspection to understand it, which is quite…
We consider networked systems in which each agent holds a certain variable, called clock, and study the synchronization problem: all clocks must eventually reach equal values modulo some given positive integer P, despite the arbitrary values of the clocks. We present some scenarios in which this problem is useful. Agents…
No abstract available.
Les voies de signalisation intracellulaire impliquent des cascades d’interaction entre protéines. Chaque cellule peut alors recevoir des signaux, les propager jusqu’à son noyau, puis les intégrer, ce qui, in fine, influe sur son comportement global. Les protéines s’associent entre elles puis modifient la structure spatiale de leurs voisines, ce qui a…
Aimed at applications of our recently developed rule algebra framework to the study of complex systems, we introduce two novel concepts. Consider a complex system specified in the form of a stochastic rewriting system, in terms of its state space, its initial state and its possible random transitions. Our combinatorial…
Biochemical molecules interact through modification and binding reactions, giving raise to a combinatorial number of possible biochemical species. The time-dependent evolution of concentrations of the species is commonly described by a system of coupled ordinary differential equations (ODEs). However, the analysis of such high-dimensional, non-linear system of equations is often…
No abstract available (joint work with Vincent Danos).
