Master of technology in information technology department of information science and



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Figure 3.7 Convolutional Neural Network 
 
3.7.5 Testing the Model
Evaluation Metrics 
Accuracy
Accuracy is a measure of total correctly identified samples out of all the 
samples.


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It is defined as:
Accuracy = TP+TN/TP+FP+FN+TN
Where,

True positive (TP) = correctly identified

False positive (FP) = incorrectly identified

True negative (TN) = correctly rejected

False negative (FN) = incorrectly rejected
Precision
Precision means to determine the number of positive class predictions 
that actually belong to the positive class.
Precision = TP/TP+FP
Recall
Recall means to determine the number of positive class predictions 
made out of all positive samples in the dataset.
Recall = TP/TP+FN
 F1-Score
F1- Score is the average mean of Precision and Recall
F1 Score = 2*(Recall * Precision) / (Recall + Precision)


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Macro Average
The method is straightforward. Just take the average of the precision 
and recall of the system on different sets. The Macro-average will be simply 
the average mean of Macro-average precision and macro-average recall.
Weighted Average
The F1 Scores are calculated for each label and then their average is 
weighted by support - which is the number of true instances for each label. It 
can result in an F1Score that is not between precision and recall. 
Algorithm - Face Mask Detection Using MobileNet V2
Input
: Images
Output
: Face Mask Detected
 
1.
I(x) ←Input Images 

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