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An exact extremal result for tournaments and 4-uniform hypergraphsFeb 21 2018In this paper, we address the following problem due to Frankl and F\"uredi (1984). What is the maximum number of hyperedges in an $r$-uniform hypergraph with $n$ vertices, such that every set of $r+1$ vertices contains $0$ or exactly $2$ hyperedges? They ... More

Matricial characterization of tournaments with maximum number of diamondsJun 11 2019A diamond is a $4$-tournament which consists of a vertex dominating or dominated by a $3$-cycle. Assuming the existence of skew-conference matrices, we give a complete characterization of $n$-tournaments with the maximum number of diamonds when $n\equiv0\pmod{4}$ ... More

Discrete time approximation of decoupled Forward-Backward SDE driven by pure jump Lévy-processesOct 23 2011We present a new algorithms to discretize a decoupled forward backward stochastic differential equations driven by pure jump L\'evy process (FBSDEL in short). The method is built in two steps. Firstly, we approximate the FBSDEL by a forward backward stochastic ... More

Skorohod equation and BSDE's with two reflecting barriersOct 03 2011We solve a class of doubly reflected backward stochastic differential equation whose generator depends on the resistance due to reflections, which extend the recent work of Qian and Xu on reflected BSDE with one barrier. We then obtain the existence and ... More

Controllability of Neutral Stochastic Functional Integro-Differential Equations Driven by Fractional Brownian Motion with Hurst Parameter Lesser than 1/2Sep 22 2018In this article we investigate the controllability for neutral stochastic functional integro-differential equations with finite delay, driven by a fractional Brownian motion with Hurst parameter lesser than $1/2$ in a Hilbert space. We employ the theory ... More

Strong envelope and strong supermartingale: application to reflected bsdesDec 01 2011Jan 04 2016We provide several characterizations to identify Strong envelop (for bounded measurable process) and Strong super-martingale (for non-negative right upper semi-continuous process of the class $\Dc$). As examples of application, we prove existence and ... More

Van't Hoff law for temperature dependent Langmuir constants in clathrate hydrate nanocavitiesMar 16 2015This work gives a van't Hoff law expression of Langmuir constants of different species for determining their occupancy in the nanocavities of clathrate hydrates. The van't Hoff law's parameters are derived from a fit with Langmuir constants calculated ... More

Optimal switching problem and system of reflected multi-dimensional FBSDEs with random terminal timeJun 15 2012Jul 02 2012In this paper, we study the solvability of a class of multi-dimensional forward backward stochastic differential equations (FBSDEs) with oblique reflection and unbounded stopping time. Under some mild assumptions on the coefficients in such FBSDE, the ... More

A note on Harnack and Transportation inequalities For Stochastic Differential Equations with reflectionsMay 03 2019We establish transportation cost inequalities, with respect to the uniform and $L_2$-metric, on the path space of continuous functions, for laws of solutions of stochastic differential equations with reflections. We also consider the case of stochastic ... More

On the Impact of the Activation Function on Deep Neural Networks TrainingFeb 19 2019The weight initialization and the activation function of deep neural networks have a crucial impact on the performance of the training procedure. An inappropriate selection can lead to the loss of information of the input during forward propagation and ... More

On the Selection of Initialization and Activation Function for Deep Neural NetworksMay 21 2018Oct 07 2018The weight initialization and the activation function of deep neural networks have a crucial impact on the performance of the training procedure. An inappropriate selection can lead to the loss of information of the input during forward propagation and ... More

Training Dynamics of Deep Networks using Stochastic Gradient Descent via Neural Tangent KernelMay 31 2019Stochastic Gradient Descent (SGD) is widely used to train deep neural networks. However, few theoretical results on the training dynamics of SGD are available. Recent work by Jacot et al. (2018) has showed that training a neural network of any kind with ... More

Deep Neural Networks Regularization for Structured Output PredictionApr 28 2015Oct 30 2017A deep neural network model is a powerful framework for learning representations. Usually, it is used to learn the relation $x \to y$ by exploiting the regularities in the input $x$. In structured output prediction problems, $y$ is multi-dimensional and ... More

A regularization scheme for structured output problems: an application to facial landmark detectionApr 28 2015Nov 18 2016Facial landmark detection is an important step for many perception tasks. In this paper, we address facial landmark detection as a structured output regression problem, where we exploit the strong dependencies that lie between the facial landmarks. For ... More

Facial landmark detection using structured output deep neural networksApr 28 2015Sep 24 2015Facial landmark detection is an important step for many perception tasks such as face recognition and facial analysis. Regression-based methods have shown a large success. In particular, deep neural networks (DNN) has demonstrated a strong capability ... More

On the abundances of noble and biologically relevant gases in Lake Vostok, AntarcticaJan 10 2013Motivated by the possibility of comparing theoretical predictions of Lake Vostok's composition with future in situ measurements, we investigate the composition of clathrates that are expected to form in this environment from the air supplied to the lake ... More

Neural Networks Regularization Through Class-wise Invariant Representation LearningSep 06 2017Dec 22 2017Training deep neural networks is known to require a large number of training samples. However, in many applications only few training samples are available. In this work, we tackle the issue of training neural networks for classification task when few ... More