An iterative algorithm is a computational method used to solve problems by incrementally approaching a solution. Instead of providing a direct answer, iterative algorithms refine their results over multiple cycles or iterations. Each iteration applies a specific set of operations based on the outcomes of the previous iteration, continually improving upon the solution until a stopping condition is met, such as reaching a predefined level of accuracy ou en complétant un nombre défini d'itérations.
These algorithms are widely utilized in various fields, including numerical analysis, optimization, and machine learning. For example, in machine learning, iterative algorithms can ajuster les paramètres du modèle to minimize error through repeated training cycles. In numerical methods, they help find approximate solutions to equations that may not have explicit solutions.
Quelques exemples courants d'algorithmes itératifs incluent :
- Descente de gradient : Utilisé en apprentissage automatique to minimize loss functions by iteratively updating parameters in the direction of the steepest descent.
- Newton’s Method: An iterative root-finding algorithm that uses derivatives to find successively better approximations to the roots of a real-valued function.
- Itération par points fixes: An algorithm that generates successive approximations to the solution of a function by repeatedly applying a function to an initial guess.
En général, les algorithmes itératifs sont essentiels pour résoudre des problèmes complexes where direct methods may be impractical, enabling efficient computation and data analysis.