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Empirical Risk Minimization
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In the context of Empirical Risk Minimization, how does overfitting relate to the choice of loss function?

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Choose the Best Answer

A

A complex loss function always leads to overfitting.

B

A simple loss function prevents overfitting by reducing model complexity.

C

Overfitting occurs when the model minimizes the training loss function too much without considering validation loss.

D

A loss function cannot affect the overfitting behavior of a model.

Understanding the Answer

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Answer

In Empirical Risk Minimization the loss function tells the model how bad each prediction error is, so it shapes what the model tries to minimize. If the loss is very harsh for small mistakes—like a squared‑error loss that squares every error—a model will chase every tiny noise in the training data, leading to overfitting. Conversely, a loss that is flatter or caps large errors—such as a Huber loss—keeps the model from reacting too strongly to outliers and can reduce overfitting. For example, a student training a regression model might see that using mean squared error makes the model fit the training set perfectly but perform poorly on new data, while switching to mean absolute error gives a smoother fit that generalizes better. Thus, the choice of loss function directly influences how aggressively a model learns from training data and whether it overfits.

Detailed Explanation

When a model focuses only on reducing training loss, it can fit noise in the data. Other options are incorrect because The idea that a complex loss function always causes overfitting is a misconception; Thinking that a simple loss function stops overfitting mixes up loss shape with model size.

Key Concepts

Loss function
Overfitting
Topic

Empirical Risk Minimization

Difficulty

medium level question

Cognitive Level

understand

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