Email: sandeep.ncacharya@gmail.com

Hello, my name is Sandeep.

My professional interests lie in researching and applying Machine Learning techniques to solve real-world problems involving natural language and conversational speech.

I previously worked as an Applied Scientist at Amazon AWS Lex on conversational AI chatbots. In this role, I built Automatic Speech Recognition (ASR) models for accurate and real-time transcription of speech. I also trained Large Language Models (LLM) to improve and personalize ASR models to customers' business needs.

I received my Ph.D. in Electrical and Computer Engineering at the University of Southern California, advised by Prof. Shrikanth Narayanan and Dr. Panayiotis Georgiou. My research explored sequential Probabilistic Graphical Models (e.g. HMM) and Deep Learning models (e.g. LSTM) for understanding how humans express behaviors such as affect, empathy and depression through their language during conversations.

Prior to USC, I obtained my M.S. from Carnegie Mellon University and my B.Tech. from Jawaharlal Nehru Technological University Hyderabad.

Publications

An analysis of observation length requirements in spoken language for machine understanding of human behaviors

Computer Speech and Language 2021| Sandeep Nallan Chakravarthula, Brian Baucom, Shrikanth Narayanan, Panayiotis Georgiou

Annotation and evaluation of coreference resolution in screenplays

ACL-IJCNLP 2021| Sabyasachee Baruah, Sandeep Nallan Chakravarthula, Shrikanth Narayanan

Automatic Prediction of Suicidal Risk in Military Couples using Multimodal Interaction Cues from Couples Conversations

ICASSP 2020| Sandeep Nallan Chakravarthula, Md Nasir, Shao-Yen Tseng, Haoqi Li, Tae Jin Park, Brian Baucom, Craig J Bryan, Shrikanth Narayanan, Panayiotis Georgiou

Smile and Laugh Dynamics in Naturalistic Dyadic Interactions: Intensity Levels, Sequences and Roles

ICMI 2019 | Kevin El Haddad, Sandeep Nallan Chakravarthula, James Kennedy

Predicting Behavior in Cancer-Afflicted Patient and Spouse Interactions using Speech and Language 

Interspeech 2019 | Sandeep Nallan Chakravarthula, Haoqi Li, Shao-Yen Tseng, Maija Reblin, Panayiotis Georgiou

Modeling Interpersonal Linguistic Coordination in Conversations using Word Mover's Distance 

Interspeech 2019 | Md Nasir, Sandeep Nallan Chakravarthula, Brian Baucom, David Atkins, Panayiotis Georgiou, Shrikanth Narayanan

Modeling Interpersonal Influence of Verbal Behavior in Couples Therapy Dyadic Interactions

Interspeech 2018 | Sandeep Nallan Chakravarthula, B. R. Baucom, Panayiotis Georgiou

Multimodal and Multiresolution Depression Detection from Speech and Facial Landmark Features

AVEC 2016 | Md Nasir, Arindam Jati, Prashanth Gurunath Shivakumar, Sandeep Nallan Chakravarthula, Panayiotis Georgiou

Multimodal Fusion of Multirate Acoustic, Prosodic, and Lexical Speaker Characteristics for Native Language Identification

Interspeech 2016 | Prashanth Gurunath Shivakumar, Sandeep Nallan Chakravarthula, Panayiotis Georgiou

Couples Behavior Modeling and Annotation Using Low-Resource LSTM Language Models

Interspeech 2016 | Shao-Yen Tseng, Sandeep Nallan Chakravarthula, Brian Baucom, Panayiotis Georgiou

Automated Evaluation of Non-Native English Pronunciation Quality: Combining Knowledge- and Data-Driven Features at Multiple Time Scales

Interspeech 2015 | Matthew Black, Daniel Bone, Zisis Iason Skordilis, Rahul Gupta, Wei Xia, Pavlos Papadopoulos, Sandeep Nallan Chakravarthula, Bo Xiao, Maarten Van Segbroeck, Jangwon Kim, Panayiotis Georgiou, Shrikanth Narayanan

Assessing Empathy using Static and Dynamic Behavior Models based on Therapist's Language in Addiction Counseling

Interspeech 2015 | Sandeep Nallan Chakravarthula, Bo Xiao, Zac E. Imel, David C. Atkins, Panayiotis Georgiou

A Language-based Generative Model Framework For Behavioral Analysis Of Couples' Therapy

ICASSP 2015 | Sandeep Nallan Chakravarthula, Rahul Gupta, Brian Baucom, Panayiotis Georgiou