Papers by Georgios Pantazopoulos
Multitask Multimodal Prompted Training for Interactive Embodied Task Completion (2023.emnlp-main)
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Georgios Pantazopoulos, Malvina Nikandrou, Amit Parekh, Bhathiya Hemanthage, Arash Eshghi, Ioannis Konstas, Verena Rieser, Oliver Lemon, Alessandro Suglia
| Challenge: | Embodied MultiModal Agent (EMMA) is a unified encoder-decoder model that reasons over images and trajectories and casts action prediction as multimodal text generation. |
| Approach: | They propose an Embodied MultiModal Agent (EMMA) that uses a unified encoder-decoder model that reasons over images and trajectories and casts action prediction as multimodal text. |
| Outcome: | The proposed model performs on par with similar models on several VL benchmarks and sets a new state-of-the-art success rate on the Dialog-guided Task Completion (DTC) benchmark. |
CROPE: Evaluating In-Context Adaptation of Vision and Language Models to Culture-Specific Concepts (2025.naacl-long)
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| Challenge: | Recent Vision and Language models have shown impressive performance across benchmarks . however, frontier models lack cultural awareness and can affect global cultural diversity . |
| Approach: | They propose a visual question answering benchmark to probe the knowledge of culture-specific concepts and evaluate the capacity for cultural adaptation through contextual information. |
| Outcome: | The proposed model shows large performance disparities between culture-specific and common concepts in the parametric setting. |
Shaking Up VLMs: Comparing Transformers and Structured State Space Models for Vision & Language Modeling (2024.emnlp-main)
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| Challenge: | a task-agnostic visual encoding yields minimal performance gains on grounding, but Transformers outperform Mamba at in-context multimodal retrieval. |
| Approach: | They propose to replace Transformers in Visual Language Models with Mamba, a structured state space model that demonstrates promising performance in sequence modeling. |
| Outcome: | The proposed model outperforms Transformers-based models in captioning, question answering, and reading comprehension. |
Lost in Space: Probing Fine-grained Spatial Understanding in Vision and Language Resamplers (2024.naacl-short)
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| Challenge: | Recent approaches for developing vision and language models leverage existing vision and a language expert and try to learn a mapping between them. |
| Approach: | They propose to use a resampler module to create a ‘visual prompt’ which is then fed to the large language models (LLM) using a textual prompt. |
| Outcome: | The proposed method has been shown to be effective across coarse-grained tasks like image captioning and visual question answering, but more fine-grounded tasks that require spatial understanding have not been thoroughly examined. |
Evaluating Multimodal Language Models as Visual Assistants for Visually Impaired Users (2025.acl-long)
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Antonia Karamolegkou, Malvina Nikandrou, Georgios Pantazopoulos, Danae Sanchez Villegas, Phillip Rust, Ruchira Dhar, Daniel Hershcovich, Anders Søgaard
| Challenge: | Despite high adoption rate of Large Language Models, there are limitations related to contextual understanding, cultural sensitivity, and complex scene understanding. |
| Approach: | They conduct a user survey to identify adoption patterns and key challenges users face with such technologies. |
| Outcome: | The proposed models have high adoption rates but still face limitations in visual aids. |