Tarun Sharma

Elijah Cole, Suzanne Stathatos, Björn Lütjens et al. · mit

Computer vision can accelerate ecology research by automating the analysis of raw imagery from sensors like camera traps, drones, and satellites. However, computer vision is an emerging discipline that is rarely taught to ecologists. This work discusses our experience teaching a diverse group of ecologists to prototype and evaluate computer vision systems in the context of an intensive hands-on summer workshop. We explain the workshop structure, discuss common challenges, and propose best practices. This document is intended for computer scientists who teach computer vision across disciplines, but it may also be useful to ecologists or other domain experts who are learning to use computer vision themselves.

Tarun Sharma

We propose IVF-TQ, an IVF index with a codebook-free residual layer: a fixed random rotation followed by precomputed Lloyd-Max scalar quantization depending only on (b, d). Only the IVF coarse partition is trained. Building on TurboQuant (Zandieh et al., 2025), the design substantially reduces a key failure mode of trained-codebook ANN indexes (PQ, OPQ, ScaNN): staleness under streaming ingestion.Empirical (3 seeds): Per-batch PQ retraining does not recover the streaming gap at any tested bit budget (paired-t p > 0.28 everywhere). On streaming Deep-10M, IVF-TQ holds at 87.4% -> 86.6% (Delta = -0.80 +/- 0.10pp) while IVF-PQ degrades -3.23pp. A shuffled-i.i.d. control on SIFT-1M shows IVF-PQ losing -3.9pp without distribution shift. At higher PQ bit budgets (~1.5x IVF-TQ memory), absolute recall favors PQ as expected from rate-distortion (+6.1pp Deep-10M; +2.0pp SIFT-10M); the durable IVF-TQ benefit is operational (no codebook to retrain), robust across memory regimes.Prior art: IVF around a codebook-free residual quantizer is architecturally not new -- IVF-RaBitQ ships in Milvus, cuVS, LanceDB, Weaviate; Shi et al. (2026) is concurrent GPU work. TurboQuant itself tests only flat-rotation ANN.Contributions: (i) A multi-seed streaming-operational story for codebook-free IVF: 10M-scale evidence across PQ memory budgets. (ii) A uniform-over-sphere IP-error bound for the TQ residual quantizer with one fixed rotation (proof sketch in v1; rigorous in v2). (iii) Adaptive IVF-TQ: a partition-only refresh recovering 67% -> 97.8% under worst-case rotation shift with re-ranking (90.3% without).Code, data: https://github.com/tarun-ks/turboquant_search

Tarun Sharma, Manikandan Ravikiran, Sourava Kumar Behera et al.

Recent NLP advances focus primarily on standardized languages, leaving most low-resource dialects under-served especially in Indian scenarios. In India, the issue is particularly important: despite Hindi being the third most spoken language globally (over 600 million speakers), its numerous dialects remain underrepresented. The situation is similar for Odia, which has around 45 million speakers. While some datasets exist which contain standard Hindi and Odia languages, their regional dialects have almost no web presence. We introduce INDIC-DIALECT, a human-curated parallel corpus of 13k sentence pairs spanning 11 dialects and 2 languages: Hindi and Odia. Using this corpus, we construct a multi-task benchmark with three tasks: dialect classification, multiple-choice question (MCQ) answering, and machine translation (MT). Our experiments show that LLMs like GPT-4o and Gemini 2.5 perform poorly on the classification task. While fine-tuned transformer based models pretrained on Indian languages substantially improve performance e.g., improving F1 from 19.6\% to 89.8\% on dialect classification. For dialect to language translation, we find that hybrid AI model achieves highest BLEU score of 61.32 compared to the baseline score of 23.36. Interestingly, due to complexity in generating dialect sentences, we observe that for language to dialect translation the ``rule-based followed by AI" approach achieves best BLEU score of 48.44 compared to the baseline score of 27.59. INDIC-DIALECT thus is a new benchmark for dialect-aware Indic NLP, and we plan to release it as open source to support further work on low-resource Indian dialects.

Edilson F. Arruda, Tarun Sharma, Rodrigo e A. Alexandre et al.

Many countries have experienced at least two waves of the COVID-19 pandemic. The second wave is far more dangerous as distinct strains appear more harmful to human health, but it stems from the complacency about the first wave. This paper introduces a parsimonious yet representative stochastic epidemic model that simulates the uncertain spread of the disease regardless of the latency and recovery time distributions. We also propose a Markov decision process to seek an optimal trade-off between the usage of the healthcare system and the economic costs of an epidemic. We apply the model to COVID-19 data from New Delhi, India and simulate the epidemic spread with different policy review times. The results show that the optimal policy acts swiftly to curb the epidemic in the first wave, thus avoiding the collapse of the healthcare system and the future costs of posterior outbreaks. An analysis of the recent collapse of the healthcare system of India during the second COVID-19 wave suggests that many lives could have been preserved if swift mitigation was promoted after the first wave.

Drew Linsley, Sven Eberhardt, Tarun Sharma et al.

Although Deep Convolutional Networks (DCNs) are approaching the accuracy of human observers at object recognition, it is unknown whether they leverage similar visual representations to achieve this performance. To address this, we introduce Clicktionary, a web-based game for identifying visual features used by human observers during object recognition. Importance maps derived from the game are consistent across participants and uncorrelated with image saliency measures. These results suggest that Clicktionary identifies image regions that are meaningful and diagnostic for object recognition but different than those driving eye movements. Surprisingly, Clicktionary importance maps are only weakly correlated with relevance maps derived from DCNs trained for object recognition. Our study demonstrates that the narrowing gap between the object recognition accuracy of human observers and DCNs obscures distinct visual strategies used by each to achieve this performance.