Search Results for author: Aparna Balagopalan

Found 15 papers, 3 papers with code

Event-Based Contrastive Learning for Medical Time Series

1 code implementation16 Dec 2023 Hyewon Jeong, Nassim Oufattole, Matthew McDermott, Aparna Balagopalan, Bryan Jangeesingh, Marzyeh Ghassemi, Collin Stultz

In clinical practice, one often needs to identify whether a patient is at high risk of adverse outcomes after some key medical event; for example, the short-term risk of death after an admission for heart failure.

Contrastive Learning Decision Making +2

The Role of Relevance in Fair Ranking

1 code implementation9 May 2023 Aparna Balagopalan, Abigail Z. Jacobs, Asia Biega

Online platforms mediate access to opportunity: relevance-based rankings create and constrain options by allocating exposure to job openings and job candidates in hiring platforms, or sellers in a marketplace.

Fairness Information Retrieval +2

The Road to Explainability is Paved with Bias: Measuring the Fairness of Explanations

no code implementations6 May 2022 Aparna Balagopalan, Haoran Zhang, Kimia Hamidieh, Thomas Hartvigsen, Frank Rudzicz, Marzyeh Ghassemi

Across two different blackbox model architectures and four popular explainability methods, we find that the approximation quality of explanation models, also known as the fidelity, differs significantly between subgroups.

BIG-bench Machine Learning Fairness

Quantifying the Task-Specific Information in Text-Based Classifications

no code implementations17 Oct 2021 Zining Zhu, Aparna Balagopalan, Marzyeh Ghassemi, Frank Rudzicz

This framework allows us to compare across datasets, saying that, apart from a set of ``shortcut features'', classifying each sample in the Multi-NLI task involves around 0. 4 nats more TSI than in the Quora Question Pair.

Comparing Acoustic-based Approaches for Alzheimer's Disease Detection

no code implementations3 Jun 2021 Aparna Balagopalan, Jekaterina Novikova

Robust strategies for Alzheimer's disease (AD) detection are important, given the high prevalence of AD.

Alzheimer's Disease Detection

Augmenting BERT Carefully with Underrepresented Linguistic Features

no code implementations12 Nov 2020 Aparna Balagopalan, Jekaterina Novikova

Fine-tuned Bidirectional Encoder Representations from Transformers (BERT)-based sequence classification models have proven to be effective for detecting Alzheimer's Disease (AD) from transcripts of human speech.

General Classification

Fantastic Features and Where to Find Them: Detecting Cognitive Impairment with a Subsequence Classification Guided Approach

no code implementations EMNLP (WNUT) 2020 Benjamin Eyre, Aparna Balagopalan, Jekaterina Novikova

Despite the widely reported success of embedding-based machine learning methods on natural language processing tasks, the use of more easily interpreted engineered features remains common in fields such as cognitive impairment (CI) detection.

BIG-bench Machine Learning Feature Engineering +1

To BERT or Not To BERT: Comparing Speech and Language-based Approaches for Alzheimer's Disease Detection

no code implementations26 Jul 2020 Aparna Balagopalan, Benjamin Eyre, Frank Rudzicz, Jekaterina Novikova

Research related to automatically detecting Alzheimer's disease (AD) is important, given the high prevalence of AD and the high cost of traditional methods.

Alzheimer's Disease Detection

Cross-Language Aphasia Detection using Optimal Transport Domain Adaptation

no code implementations4 Dec 2019 Aparna Balagopalan, Jekaterina Novikova, Matthew B. A. McDermott, Bret Nestor, Tristan Naumann, Marzyeh Ghassemi

We learn mappings from other languages to English and detect aphasia from linguistic characteristics of speech, and show that OT domain adaptation improves aphasia detection over unilingual baselines for French (6% increased F1) and Mandarin (5% increased F1).

Domain Adaptation

Lexical Features Are More Vulnerable, Syntactic Features Have More Predictive Power

no code implementations WS 2019 Jekaterina Novikova, Aparna Balagopalan, Ksenia Shkaruta, Frank Rudzicz

Understanding the vulnerability of linguistic features extracted from noisy text is important for both developing better health text classification models and for interpreting vulnerabilities of natural language models.

General Classification text-classification +1

Impact of ASR on Alzheimer's Disease Detection: All Errors are Equal, but Deletions are More Equal than Others

no code implementations2 Apr 2019 Aparna Balagopalan, Ksenia Shkaruta, Jekaterina Novikova

We find that deletion errors affect detection performance the most, due to their impact on the features of syntactic complexity and discourse representation in speech.

Alzheimer's Disease Detection Automatic Speech Recognition +2

ReGAN: RE[LAX|BAR|INFORCE] based Sequence Generation using GANs

no code implementations8 May 2018 Aparna Balagopalan, Satya Gorti, Mathieu Ravaut, Raeid Saqur

Although GANs have had a lot of success in producing more realistic images than other approaches, they have only seen limited use for text sequences.

Image Generation

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