A layer in the context of intelligence artificielle, particularly in réseaux neuronaux, refers to a specific level of processing that contributes to the fonction globale of the model. Neural networks are composed of multiple layers, each designed to perform a particular transformation or computation on the input data.
Les couches peuvent être classées en trois types principaux :
- Couche d'entrée: This is the first layer that receives the raw input data. Each node in this layer represents a feature or attribute of the input.
- Couches cachées : These layers lie between the input and output layers. They perform complex transformations and extraction de caractéristiques. A réseau neuronal can have one or more hidden layers, and the number of neurons in each layer can vary. The depth and architecture of these layers significantly affect the model’s ability to learn and generalize from the data.
- Couche de sortie: This is the final layer that produces the output of the model, such as classifications or predictions. The number of neurons in this layer typically corresponds to the number of classes or outcomes.
Each layer consists of nodes (or neurons) that are interconnected, and each connection has an associated weight that adjusts during training. The layers work together in a hierarchical manner, where the output of one layer serves as the input to the next. This layered structure allows neural networks to learn complex patterns in data, making them powerful tools for tasks like image recognition, traitement du langage naturel, and more.