Which metric should you use? SELECT ONLY ONE Duality Precision Recall Accuracy

The metric you should use depends on the specific context or problem you are trying to solve. Here is a brief explanation of each metric:

1. Duality: This is not a common metric in data science or machine learning, so it's unlikely this is the correct choice.

2. Precision: This is a good metric to use when the cost of False Positive is high. For example, in spam detection, you would rather have some spam emails in your inbox (False Negative) than some regular emails in your spam box (False Positive).

3. Recall: This is a good metric to use when the cost of False Negative is high. For example, in fraud detection, you would rather flag some regular transactions as fraudulent (False Positive) than let some fraudulent transactions go unnoticed (False Negative).

4. Accuracy: This is a good metric when the dataset is balanced and the cost of False Positive and False Negative is approximately the same.

Without more information about the specific problem, it's impossible to definitively say which metric you should use.