# What are some common optimization algorithms used in machine learning?

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**Junior** Tags: Machine learning

## Answer

Optimization algorithms are a crucial component in the development of machine learning models. Here are some common optimization algorithms used in machine learning:

**Gradient Descent:**Gradient descent is a widely used optimization algorithm that is used to minimize the cost function of a machine learning model. It works by iteratively adjusting the weights of the model in the direction of the negative gradient of the cost function.**Stochastic Gradient Descent (SGD):**Stochastic gradient descent is similar to gradient descent, but instead of computing the gradient over the entire dataset, it computes the gradient using a randomly selected subset of the data.**Adam:**Adam (Adaptive Moment Estimation) is an optimization algorithm that combines ideas from both momentum and RMSProp. It adapts the learning rate based on the first and second moments of the gradients.**Adagrad:**Adagrad (Adaptive Gradient) is an optimization algorithm that adapts the learning rate based on the magnitudes of the gradients for each weight.**AdaDelta:**AdaDelta is an extension of Adagrad that seeks to reduce the aggressive, monotonically decreasing learning rate.**L-BFGS:**Limited-memory Broyden–Fletcher–Goldfarb–Shanno (L-BFGS) is a quasi-Newton optimization algorithm that approximates the inverse Hessian matrix.**Conjugate Gradient:**Conjugate Gradient is an optimization algorithm that is used for quadratic optimization problems.**Nesterov Accelerated Gradient (NAG):**Nesterov Accelerated Gradient is an optimization algorithm that is used to accelerate the gradient descent method.

These algorithms are just a few examples of the many optimization algorithms used in machine learning. The choice of which algorithm to use depends on the specific problem being solved and the characteristics of the dataset.

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