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The least squares cost function measures the average squared difference between the predicted values (based on the model parameters and features) and the actual target values. It is commonly used in linear regression to evaluate model performance.

Conditions: Used for regression problems where the goal is to predict a continuous value.; Assumes a linear relationship between the features and the target variable.

The least squares cost function measures the average squared difference between the predicted values (based on the model parameters and features) and the actual target values. It is commonly used in linear regression to evaluate model performance.

Conditions: Used for regression problems where the goal is to predict a continuous value.; Assumes a linear relationship between the features and the target variable.

Gradient descent is an optimization algorithm used to minimize a cost function by iteratively updating the model parameters in the opposite direction of the gradient of the cost function with respect to those parameters.

Conditions: The cost function J must be differentiable with respect to the parameters $\theta$.; The learning rate $\alpha$ must be chosen appropriately to ensure convergence.

Gradient descent is an optimization algorithm used to minimize a cost function by iteratively updating the model parameters in the opposite direction of the gradient of the cost function with respect to those parameters.

Conditions: The cost function J must be differentiable with respect to the parameters $\theta$.; The learning rate $\alpha$ must be chosen appropriately to ensure convergence.