📚 Learning Guide
Multi-class Loss Functions
medium

Neyman-Pearson loss : penalizes false positives :: Logistic loss : ?

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Choose the Best Answer

A

penalizes incorrect class assignments

B

minimizes the distance to the decision boundary

C

maximizes true positives

D

focuses on false negatives

Understanding the Answer

Let's break down why this is correct

Answer

Neyman‑Pearson loss is tuned to keep the number of false positives low, so it focuses on the cost of a positive prediction that turns out to be wrong. Logistic loss, or cross‑entropy loss, treats every misclassification the same way: it assigns a high penalty whenever the predicted probability for the true class is low, regardless of whether the error is a false positive or a false negative. In other words, logistic loss penalizes the lack of confidence in the correct class, encouraging the model to output high probability for the true label and low probability for the others. For example, if the true label is 1 but the model outputs 0. 1, the loss is –log 0.

Detailed Explanation

Logistic loss, also called log loss, measures how far the predicted probability is from the true label. Other options are incorrect because People think logistic loss pushes predictions toward the decision boundary; Some believe logistic loss rewards true positives.

Key Concepts

Multi-class Loss Functions
Classification Performance Evaluation
Optimization Techniques
Topic

Multi-class Loss Functions

Difficulty

medium level question

Cognitive Level

understand

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