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F1
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116.
Computing F1 Score
medium
A model achieves precision of 0.9 and recall of 0.1. What is its F1 score?
A
0.50, since F1 averages precision and recall with equal weight
B
0.90, since high precision dominates F1 when one metric greatly exceeds the other
C
0.45, since F1 applies a 0.9 weight to precision and 0.1 weight to recall proportionally
D
Approximately 0.18, since the harmonic mean is dominated by the low recall
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