A multilayer réseau neuronal is a type of réseau de neurones artificiels that contains multiple layers of nodes (neurons) which are interconnected. These layers typically include an couche d'entrée, one or more hidden layers, and an couche de sortie. Each layer in the network performs a specific transformation of the input data, enabling the network to learn complex patterns and representations.
The input layer receives the initial data, and the neurons in this layer pass the information to the hidden layers. The hidden layers process the inputs using fonctions d'activation, which introduce non-linearities into the model, allowing it to learn from errors and improve its predictions over time. Common activation functions used in multilayer networks include the Rectified Linear Unit (ReLU), Sigmoid, and Tanh functions.
The final output layer produces the network’s predictions or classifications based on the processed information from the hidden layers. Training a multilayer neural network involves adjusting the weights of the connections between nodes through a process called backpropagation, which minimizes the error between the predicted outputs and the actual targets.
Multilayer neural networks are the foundation of deep learning and are widely used in various applications, including image recognition, natural language processing, and speech recognition. Their ability to automatically extract features and learn from large datasets makes them powerful tools in the domaine de l'intelligence artificielle.