$$ The process of splitting a dataset into three subsets: training, validation, and $\_\_\_\_\_$ is crucial in evaluating model performance $,$ during training.

$\_\_\_\_$ is a deep learning framework known for its ease of use and deployment, allowing for both symbolic and imperative programming.

$$ In a Convolutional Neural Network $($CNN$),$ the primary operation used for feature extraction is $\_\_\_\_.$

$$ A technique used to prevent overfitting in neural networks by penalizing large weights or parameters is known as $\_\_\_\_\_\_$