Layer
A layer is a sheet, thickness, or level of material or abstraction that covers or is arranged over another, often providing structure, protection, or organization. In everyday use, it might refer to something physical like clothing or soil strata, while in tech and science, it denotes hierarchical components in systems like software architecture or geological formations, highlighting how complexity builds from simple building blocks.
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In deep learning, the human brain-inspired neural network AlexNet, which revolutionized image recognition in 2012, used just five layers, but modern models like GPT-4 can have over a hundred, allowing them to process language with astonishing accuracy rivaling human performance.
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