Improving Reinforcement Learning Based Image Captioning with Natural Language Prior (D18-1)
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| Challenge: | Recent research shows that Reinforcement Learning (RL) approaches suffer from the exposure bias problem. |
| Approach: | They propose a Reinforcement Learning (RL) based training framework that constrains the action space using an n-gram language prior. |
| Outcome: | The proposed model is more human readable and graceful. |
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| Challenge: | Novel Object Captioning is a zero-shot Image Caption task requiring describing objects not seen in the training captions, but for which information is available from external object detectors. |
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| Challenge: | In reinforcement learning-based sentence generation, the large action space is often too computa-tionally demanding to be used with large training data. |
| Approach: | They propose to reduce the action space by using dynamic vocabulary prediction to generate a fixed-size small vocabulary for each input to generate its target sentence. |
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Reinforcement Learning with Large Action Spaces for Neural Machine Translation (2022.coling-1)
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| Challenge: | Recent work has argued that the gains produced by Reinforcement learning are mostly due to promoting tokens that have already received a fairly high probability in pre-training. |
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Direct Metric Optimization for Image Captioning through Reward-Weighted Augmented Data Utilization (2024.acl-long)
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Takumi Takada, Yuma Suzuki, Hiroki Takushima, Hayato Tanoue, Haruki Sato, Aiswariya Kumar, Hiroki Nishihara, Takayuki Hori, Kazuya Ueki
| Challenge: | Recent large-scale vision language models (VLMs) lack continuity between learning objective and performance metrics. |
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Bridging by Word: Image Grounded Vocabulary Construction for Visual Captioning (P19-1)
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| Challenge: | Existing research on image captioning generates frequent n-grams with irrelevant words. |
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Reinforcement Learning with Token-level Feedback for Controllable Text Generation (2024.findings-naacl)
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| Challenge: | Existing methods for controllable text generation are guided by coarse-grained feedback, which may lead to suboptimal performance owing to semantic twists or progressions within sentences. |
| Approach: | They propose a reinforcement learning algorithm which formulates TOken-LEvel rewards for controllable text generation and employs a "first-quantize-then-noise" paradigm to enhance the robustness of the RL algorithm. |
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Deep Reinforcement Learning for NLP (P18-5)
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| Challenge: | Many natural language processing tasks can be formulated as deep reinforcement learning (DRL) problems. |
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Natural Language-based State Representation in Deep Reinforcement Learning (2024.findings-naacl)
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| Challenge: | a new method for learning policies from images is proposed to reduce image-based observations' complexity and improve interpretability. |
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Cross-Modal Similarity-Based Curriculum Learning for Image Captioning (2022.emnlp-main)
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| Challenge: | Existing image captioning approaches treat image-caption pairs indistinctly without considering the differences in their learning difficulties. |
| Approach: | They propose a pretrained vision–language model that measures cross-modal similarity and a model that uses cross-module similarity to measure the difficulty of captioning. |
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Precision or Recall? An Analysis of Image Captions for Training Text-to-Image Generation Model (2024.findings-emnlp)
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| Challenge: | Recent advances in text-to-image models have demonstrated remarkable capabilities in image synthesis. |
| Approach: | They analyze the critical role of caption precision and recall in text-to-image model training. |
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