What does a confusion matrix show?

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Supervised and Unsupervised Learning are two primary types of machine learning, differing mainly in how they process and learn from data.

Neural networks are a type of machine learning model inspired by the structure and function of the human brain. They are designed to recognize patterns and relationships in data through a process of learning.

A confusion matrix is a table used to evaluate the performance of a classification model by showing the actual vs predicted classifications.


What it shows:

Predicted PositivePredicted Negative
Actual PositiveTrue Positive (TP)False Negative (FN)
Actual NegativeFalse Positive (FP)True Negative (TN)
True Positive (TP): Correctly predicted positive cases.
  • True Negative (TN): Correctly predicted negative cases.

  • False Positive (FP): Incorrectly predicted positive (Type I error).

  • False Negative (FN): Incorrectly predicted negative (Type II error).


Why it’s useful:

  • Helps calculate metrics like accuracy, precision, recall, F1-score.

  • Identifies types of errors your model makes.

  • Useful for imbalanced datasets where accuracy alone is misleading.


Summary:

A confusion matrix provides a detailed breakdown of classification results, showing where the model got predictions right or wrong, which helps in understanding and improving model performance.

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