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{{see also|Machine learning terms}}
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==Overview==
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In [[machine learning]], the term "test" typically refers to the process of evaluating the performance of a trained model on a separate dataset, which is referred to as the test set. This process is an essential step in ensuring the model's ability to generalize to new, previously unseen data. By testing the model on data it has not encountered during training, it becomes possible to estimate its real-world performance and identify potential issues such as [[overfitting]] or [[underfitting]]. The following sections will elaborate on the key components of testing in machine learning.
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==Test Set==
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===Definition===
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The '''test set''' is a subset of the available data that is set aside for evaluating a machine learning model's performance. It is distinct from the [[training set]], which is used to train the model, and the [[validation set]], which is used for tuning model parameters and architecture. The test set should be representative of the data the model will encounter in real-world scenarios, and it should not overlap with the training or validation sets.
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===Importance===
The test set plays a crucial role in machine learning as it allows for an unbiased estimation of the model's performance. By keeping the test set separate from the training and validation sets, it becomes possible to evaluate how well the model can generalize to new data. This separation helps to prevent overfitting, where the model performs well on the training set but poorly on new data, as it provides a means of detecting this issue before the model is deployed in real-world applications.
 
==Evaluation Metrics==
===Definition===
'''Evaluation metrics''' are quantitative measures used to assess a machine learning model's performance on the test set. Different evaluation metrics are appropriate for different types of problems and models. For example, classification problems might use metrics such as [[accuracy]], [[precision]], [[recall]], or the [[F1 score]], while regression problems might use metrics such as mean squared error or [[R-squared]].
 
===Choosing Appropriate Metrics===
Selecting the right evaluation metric is crucial in ensuring a meaningful assessment of a model's performance. The choice of metric depends on the specific problem being addressed, the type of model being used, and the desired trade-offs between performance characteristics. In some cases, multiple metrics may be used to evaluate different aspects of the model's performance, or a custom metric may be designed to better capture the specific requirements of a particular application.
 
==Explain Like I'm 5 (ELI5)==
In machine learning, testing is like a final exam for a model that has been studying some data. We give the model a separate set of questions, called a test set, to see how well it learned from the data it studied. This helps us find out if our model is good at solving real-world problems or if it just memorized the study material. We also use something called evaluation metrics to measure how well our model did on the test. These metrics help us understand how good our model is at solving the specific problem we want it to solve.
 
 
[[Category:Terms]] [[Category:Machine learning terms]] [[Category:Not Edited]] [[Category:updated]]

Latest revision as of 08:03, 24 January 2024

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