A Comprehensive Survey of Convolutions in Deep Learning: Applications, Challenges, and Future Trends (2402.15490v2)

Abstract: In today's digital age, Convolutional Neural Networks (CNNs), a subset of Deep Learning (DL), are widely used for various computer vision tasks such as image classification, object detection, and image segmentation. There are numerous types of CNNs designed to meet specific needs and requirements, including 1D, 2D, and 3D CNNs, as well as dilated, grouped, attention, depthwise convolutions, and NAS, among others. Each type of CNN has its unique structure and characteristics, making it suitable for specific tasks. It's crucial to gain a thorough understanding and perform a comparative analysis of these different CNN types to understand their strengths and weaknesses. Furthermore, studying the performance, limitations, and practical applications of each type of CNN can aid in the development of new and improved architectures in the future. We also dive into the platforms and frameworks that researchers utilize for their research or development from various perspectives. Additionally, we explore the main research fields of CNN like 6D vision, generative models, and meta-learning. This survey paper provides a comprehensive examination and comparison of various CNN architectures, highlighting their architectural differences and emphasizing their respective advantages, disadvantages, applications, challenges, and future trends.

• The paper presents a detailed comparison of convolution methods, emphasizing their efficiency and adaptability across deep learning applications.
• It analyzes trade-offs in computational complexity and performance among techniques like 2D, 3D, and depthwise separable convolutions.
• The survey identifies key trends and future directions, including self-supervision, neural architecture search, and integration with transformer models.

A Comprehensive Survey of Convolutions in Deep Learning: Navigating Architectures, Challenges, and Innovations

Introduction to Convolutional Neural Networks

The domain of deep learning, particularly Convolutional Neural Networks (CNNs), has witnessed a significant evolution over the past decade. Traditionally renowned for their efficacy in computer vision tasks, CNNs have diversified their application scope to include areas such as NLP, audio signal processing, and even medical image analysis. This survey paper explores the myriad convolution types integral to CNNs, including traditional 2D convolutions, depthwise separable convolutions, dilated, and grouped convolutions, among others. Each type's unique structural attributes, computational implications, and suitability for specific tasks are thoroughly discussed.

Overview of Convolutional Techniques

The core of CNNs—convolutions—serves as the primary mechanism for feature extraction across various data formats. Understanding the intricacies of different convolution types is pivotal for designing architectures optimized for performance and efficiency. This includes recognizing the utility of 1D convolutions for time-series data and audio signals, 3D convolutions for volumetric data, and more specialized forms like transposed convolutions for tasks requiring upsampling. The survey underscores the importance of selecting appropriate convolution methods to maximize accuracy, reduce computational requirements, and accommodate the memory constraints of deployment environments.

Advanced Convolutional Techniques and Their Applications

Beyond basic convolution operations, advanced techniques have emerged, broadening CNNs' applicability and efficiency. Notably, depthwise separable convolutions have gained popularity for their reduced parameter count, proving indispensable in mobile and low-resource applications. Similarly, spatial pyramid pooling and attention mechanisms within convolutions facilitate handling inputs of varying sizes and focusing computational resources on regions of interest. These advancements not only enhance model performance but also address longstanding challenges such as model scalability and interpretability.

Performance Considerations and Trends

Performance and efficiency considerations remain at the forefront of CNN evolution. The survey discusses strategies to balance accuracy with inference speed and model size, highlighting methods like model pruning, quantization, and leveraging mixed-precision computations. It also points to emerging trends, such as incorporating self-supervised learning for pretraining models and exploring architectures that blend CNNs with transformer models for enriched feature representation.

Research Fields and Future Directions

CNNs remain a hotbed of innovation, with research extending into domains like meta-learning, federated learning, and generative models. The exploration of neural architecture search (NAS) and vision transformers exemplifies the field’s dynamism, signaling a shift towards more adaptive and generalized models. Furthermore, the ongoing interest in areas such as 6D vision and multimodal learning underscores the expansive potential of CNNs to revolutionize how we process and interpret data across a spectrum of applications.

Conclusion

Convolutional Neural Networks have transcended their initial applications, proving to be a cornerstone of the deep learning landscape. This survey provides a holistic overview of convolutional techniques, highlighting their significance, challenges, and the exciting trajectory of ongoing research. As CNNs continue to evolve, their adaptability and performance will undoubtedly unlock new possibilities across diverse fields, further cementing their role in advancing artificial intelligence.