The F-score represents a test’s accuracy. It’s computed by taking the Harmonic Mean of the Precision and Recall.

$$F_1 = \frac{2}{\frac{1}{Precision}+\frac{1}{Recall}}$$

The result will be between $0.0$ (meaning being completely inaccurate) and $1.0$ (meaning being completely perfect).

References

• https://www.wikiwand.com/en/F1_score