Model Evaluation

You will learn: how to assess to evaluation of ML models.
Classification metrics
Accuracy: computes the number of correct predictions divided by the total number of samples.
​Accuracy=number correct predictionsnumber of samplesAccuracy = \frac{number \space correct \space predictions}{number \space of \space samples}Accuracy=number of samplesnumber correct predictions​​
Sensitivity: also known as recall, is computed as the fraction of true positives that are correctly identified.
​Sensitivity=number of true positivesnumber of true positives+number of false negativesSensitivity = \frac{number \space of \space true \space positives}{number \space of \space true \space positives + number \space of \space false \space negatives}Sensitivity=number of true positives+number of false negativesnumber of true positives​​
Precision: computed as the fraction of retrieved instances that are relevant.
​Precision=number of true positivesnumber of true positives+number of false positivesPrecision = \frac{number \space of \space true \space positives}{number \space of \space true \space positives + number \space of \space false \space positives}Precision=number of true positives+number of false positivesnumber of true positives​​
Specificity: computed as the fraction of true negatives that are correctly identified.
​Specificity=number of true negativesnumber of true negatives+number of false positivesSpecificity = \frac{number \space of \space true \space negatives}{number \space of \space true \space negatives + number \space of \space false \space positives}Specificity=number of true negatives+number of false positivesnumber of true negatives​​
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