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Parameterized Function
This mathematical expression defines a function, denoted as , whose behavior is determined by a set of parameters, specifically and . The subscript parameters modify the function's output. The hat symbol (^) over typically indicates that it is an estimated parameter, likely derived from data. The notation serves as a placeholder for the function's input argument.

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Ch.1 Pre-training - Foundations of Large Language Models
Foundations of Large Language Models
Foundations of Large Language Models Course
Computing Sciences
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A machine learning model is defined by the function , where represents the fixed architectural parameters (e.g., number of layers) and represents the parameters learned from data (e.g., connection weights). The model is initially trained on a dataset of images of cats. If the exact same model architecture is then retrained from scratch on a new dataset of images of dogs, which component of the notation is expected to have a new value as a direct result of this new training process?
Deconstructing a Model's Function
Mapping a Spam Filter to Functional Notation