At CereLabs, we are building various image classification systems. While building any kind of classification system one is often challenged to test the trained models. One useful measure to test such models is accuracy, which is the proportion of true results and the total number of images examined. Accuracy thus communicates the essential message of how close one comes to the correct result. In the case of an image classification system, accuracy is how accurately the trained model is able to classify the test image dataset. If we are trying to classify the image of an apple, accuracy will be the measure of how accurately the classifier is able to detect the apple in an image. Consider the following confusion matrix. True Positive (TP) Actual image contains an apple, and is correctly classified as an apple False Negative (FN) Actual image contains an apple but is not classified as an apple False Positive (FP) Actual image does not contain an apple but is class