True positive (TP): Difference between revisions

Revision as of 05:29, 22 February 2023

Introduction

True positive (TP) is when the machine learning model correctly predicts the positive class. Machine learning classification is the process of classifying data into distinct classes. When assessing a model's performance, it is essential to assess its capacity for correctly predicting each data instance's class. One important evaluation metric used in binary classification is True Positive (TP), which is when positive examples is correctly classified as positive by the model.

Example

True Positive is when binary classification models correctly predict a positive class. Consider a binary classification problem where we need to predict if someone has or does not have a disease based on some medical tests. In this scenario, the positive class represents those with the disease, while the negative class represents those without. If our model correctly predicts someone has the disease, and they actually do, then this prediction is known as a True Positive.

Explain Like I'm 5 (ELI5)

Machine learning algorithms strive for true positives - like when you find the toy you were searching for.

Imagine playing a game where you must locate a hidden toy in your room. When you finally locate it, you are thrilled that you found what you were searching for - an affirmative moment as you have successfully located what you needed. This is an achievement in itself as proof that your efforts paid off!

Machine learning teaches computers how to recognize objects, like pictures of cats. A true positive is when the computer correctly determines that something is indeed a cat when it really is one.

Similar to when humans play "find the cat", wherein a computer can correctly identify when something in an image is indeed a cat. This is beneficial, as we want the machine to be able to correctly recognize when something is indeed a cat.

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 ==Introduction==
-Machine learning classification is the process of classifying data into distinct classes. When assessing a model's performance, it is essential to assess its capacity for correctly predicting each data instance's class. One important evaluation metric used in binary classification is True Positive (TP), which measures how many positive samples are correctly classified as positive by the model.
+[[True positive (TP)]] is when the [[machine learning model]] correctly predicts the [[positive class]]. [[Machine learning]] [[classification]] is the process of classifying [[data]] into distinct [[classes]]. When assessing a [[model]]'s performance, it is essential to assess its capacity for correctly predicting each data instance's [[class]]. One important evaluation [[metric]] used in [[binary classification]] is [[True Positive (TP)]], which is when positive [[examples]] is correctly classified as positive by the model.
-==What is True Positive?==
+==Example==
-True Positive is a statistic used in binary classification problems to measure the number of samples classified correctly as positive by a model. It's defined as the number of positive samples correctly predicted as such by the algorithm, or in other words: True Positive counts the samples belonging to the positive class that are correctly classified by the system.
+True Positive is when binary classification models correctly predict a positive class. Consider a binary classification problem where we need to predict if someone has or does not have a disease based on some medical tests. In this scenario, the positive class represents those with the disease, while the negative class represents those without. If our model correctly predicts someone has the disease, and they actually do, then this prediction is known as a True Positive.
-Consider a binary classification problem where we need to predict if someone has or does not have a disease based on some medical tests. In this scenario, the positive class represents those with the disease, while the negative class represents those without. If our model correctly predicts someone has the disease, and they actually do, then this prediction is known as a True Positive.
+==Explain Like I'm 5 (ELI5)==
+Machine learning algorithms strive for true positives - like when you find the toy you were searching for.
-==How is True Positive used in Evaluation?==
-True Positive (TP) rate is an essential metric when evaluating a classification model's performance, particularly when misclassification has high costs. For instance, misclassifying patients with diseases as healthy can have dire repercussions; thus, it's vital to minimize False Negative (FN) rate--which measures the number of positive samples incorrectly classified as negative by the model--which measures false positive rates.
-True Positive is used in combination with other evaluation metrics to calculate the performance of a classification model. Common metrics used in binary classification include Precision, Recall and F1-score. Precision measures the proportion of True Positive samples predicted as positive by the model while Recall measures its proportion among actual members of that positive class. Finally, F1-score represents the harmonic mean between Precision and Recall.
-==Explain Like I'm 5 (ELI5)==
+Imagine playing a game where you must locate a hidden toy in your room. When you finally locate it, you are thrilled that you found what you were searching for - an affirmative moment as you have successfully located what you needed. This is an achievement in itself as proof that your efforts paid off!
-Machine learning, also known as deep reinforcement learning, is the process of teaching a computer to recognize objects by showing it what to search for. For instance, we could teach your machine to recognize cats and dogs by showing it multiple pictures of both and instructing it which one belongs where.
-When the computer encounters a new picture, it attempts to guess whether it is of a cat or dog. If its guess is correct, we refer to this as a True Positive; meaning the computer was right in identifying what the image was.
+Machine learning teaches computers how to recognize objects, like pictures of cats. A true positive is when the computer correctly determines that something is indeed a cat when it really is one.
-Knowing how many True Positives a computer receives is important because it allows us to assess its learning progress. If the machine makes too many errors, we need to figure out why so that we can assist it in becoming better educated.
+Similar to when humans play "find the cat", wherein a computer can correctly identify when something in an image is indeed a cat. This is beneficial, as we want the machine to be able to correctly recognize when something is indeed a cat.