Combining convolutional neural networks (CNNs) and recurrent neural networks (RNNs) produces a powerful architecture for video classification problems as spatial–temporal information can be processed simultaneously and effectively. Using transfer learning, this paper presents a comparative study to investigate how temporal information can be utilized to improve the performance of video classification when CNNs and RNNs are combined in various architectures. To enhance the performance of the identified architecture for effective combination of CNN and RNN, a novel action template-based keyframe extraction method is proposed by identifying the informative region of each frame and selecting keyframes based on the similarity between those regions. Extensive experiments on KTH and UCF-101 datasets with ConvLSTM-based video classifiers have been conducted. Experimental results are evaluated using one-way analysis of variance, which reveals the effectiveness of the proposed keyframe extraction method in the sense that it can significantly improve video classification accuracy.

Information fusion is frequently employed to integrate diverse inputs, including sensory data, features, or decisions, in order to leverage the advantageous relationships among various features and classifiers. This paper presents a novel approach for video classification using deep learning architectures, including ConvLSTM and vision transformer based fusion architectures, which incorporates the combination of spatial and temporal features, along with the utilisation of decision fusion at multiple levels. The proposed vision transformer based method uses a 3D CNN to extract spatio-temporal information and different attention mechanisms to pay attention to essential features for action recognition and thus learns spatio-temporal dependencies effectively. The effectiveness of the methods proposed in this paper is validated through empirical evaluations conducted on two well-known video classification datasets, namely UCF-101 and KTH. The experimental findings indicate that the utilisation of both spatial and temporal features is essential, with the superior performance gained by using temporal features as the primary source of features in conjunction with two types of distinct spatial features when compared to other configurations. The multi-level decision fusion approach proposed in this study produces results comparable to those of feature fusion methods while offering the advantage of reduced memory requirements and computational costs. The fusion of RGB, HOG, and optical flow representations has demonstrated the best performance compared to other fusion methods examined in this study. It has also been demonstrated that the vision transformer based approaches significantly outperformed the ConvLSTM based approaches. Furthermore, an ablation study was conducted to compare the performances of vision transformer based feature fusion approaches for enhancing the performance of video classification.

This study investigates the application of advanced fine-tuned Large Language Models (LLMs) for Turkish Sentiment Analysis (SA), focusing on e-commerce product reviews. Our research utilizes four open-source Turkish SA datasets: Turkish Sentiment Analysis version 1 (TRSAv1), Vitamins and Supplements Customer Review (VSCR), Turkish Sentiment Analysis Dataset (TSAD), and TR Customer Review (TRCR). While these datasets were initially labeled based on star ratings, we implemented a comprehensive relabeling process using state-of-the-art LLMs to enhance data quality. To ensure reliable annotations, we first conducted a comparative analysis of different LLMs using the Cohen’s Kappa agreement metric, which led to the selection of ChatGPT-4o-mini as the best-performing model for dataset annotation. Our methodology then focuses on evaluating the SA capabilities of leading instruction-tuned LLMs through a comparative analysis of zero-shot models and Low-Rank Adaptation (LoRA) fine-tuned LlaMA-3.2-1B-IT and Gemma- 2-2B-IT models. Evaluations were conducted on both in-domain and out-domain test sets derived from the original star-ratings-based labels and the newly generated GPT labels. The results demonstrate that our finetuned models outperformed leading commercial LLMs by 6% in both in-domain and out-domain evaluations. Notably, models fine-tuned on GPT-generated labels achieved superior performance, with in-domain and outdomain F1-scores reaching 0.912 and 0.9184, respectively. These findings underscore the transformative potential of combining LLM relabeling with LoRA fine-tuning for optimizing SA, demonstrating robust performance across diverse datasets and domains.

Using a collection of publicly available links to short form video clips of an average of 6 seconds duration each, 1275 users manually annotated each video multiple times to indicate both long-term and short-term memorability of the videos. The annotations were gathered as part of an online memory game and measured a participant’s ability to recall having seen the video previously when shown a collection of videos. The recognition tasks were performed on videos seen within the previous few minutes for short-term memorability and within the previous 24 to 72 hours for long-term memorability. Data includes the reaction times for each recognition of each video. Associated with each video are text descriptions (captions) as well as a collection of image-level features applied to 3 frames extracted from each video (start, middle and end). Video-level features are also provided. The dataset was used in the Video Memorability task as part of the MediaEval benchmark in 2020.