Search Results for author: Ishanu Chattopadhyay

Found 10 papers, 2 papers with code

Long-range Event-level Prediction and Response Simulation for Urban Crime and Global Terrorism with Granger Networks

no code implementations4 Nov 2019 Timmy Li, Yi Huang, James Evans, Ishanu Chattopadhyay

Large-scale trends in urban crime and global terrorism are well-predicted by socio-economic drivers, but focused, event-level predictions have had limited success.

Data Smashing 2.0: Sequence Likelihood (SL) Divergence For Fast Time Series Comparison

no code implementations26 Sep 2019 Yi Huang, Ishanu Chattopadhyay

Recognizing subtle historical patterns is central to modeling and forecasting problems in time series analysis.

Feature Engineering Time Series +1

A Tamper-Free Semi-Universal Communication System for Deletion Channels

no code implementations9 Apr 2018 Shahab Asoodeh, Yi Huang, Ishanu Chattopadhyay

We investigate the problem of reliable communication between two legitimate parties over deletion channels under an active eavesdropping (aka jamming) adversarial model.

Autostacker: A Compositional Evolutionary Learning System

no code implementations2 Mar 2018 Boyuan Chen, Harvey Wu, Warren Mo, Ishanu Chattopadhyay, Hod Lipson

We introduce an automatic machine learning (AutoML) modeling architecture called Autostacker, which combines an innovative hierarchical stacking architecture and an Evolutionary Algorithm (EA) to perform efficient parameter search.

BIG-bench Machine Learning Hyperparameter Optimization

A Hilbert Space of Stationary Ergodic Processes

no code implementations25 Jan 2018 Ishanu Chattopadhyay

Identifying meaningful signal buried in noise is a problem of interest arising in diverse scenarios of data-driven modeling.

Clustering Robust classification +1

Causality Networks

1 code implementation25 Jun 2014 Ishanu Chattopadhyay

While correlation measures are used to discern statistical relationships between observed variables in almost all branches of data-driven scientific inquiry, what we are really interested in is the existence of causal dependence.

Computing Entropy Rate Of Symbol Sources & A Distribution-free Limit Theorem

no code implementations3 Jan 2014 Ishanu Chattopadhyay, Hod Lipson

Entropy rate of sequential data-streams naturally quantifies the complexity of the generative process.

Data Smashing

1 code implementation3 Jan 2014 Ishanu Chattopadhyay, Hod Lipson

Here, we propose a universal solution to this problem: we delineate a principle for quantifying similarity between sources of arbitrary data streams, without a priori knowledge, features or training.

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