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Fix mAP calculations #7714

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Fix mAP calculations #7714

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ad25966
Fix mAP calucation
comlhj1114 May 6, 2022
f73e549
Merge remote-tracking branch 'upstream/master' into fix/mAP
comlhj1114 May 6, 2022
6e2a35a
[pre-commit.ci] auto fixes from pre-commit.com hooks
pre-commit-ci[bot] May 6, 2022
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8 changes: 4 additions & 4 deletions utils/metrics.py
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Original file line number Diff line number Diff line change
Expand Up @@ -57,11 +57,11 @@ def ap_per_class(tp, conf, pred_cls, target_cls, plot=False, save_dir='.', names

# Recall
recall = tpc / (n_l + eps) # recall curve
r[ci] = np.interp(-px, -conf[i], recall[:, 0], left=0) # negative x, xp because xp decreases
r[ci] = np.interp(-px, -conf[i], recall[:, 0], left=0, right=0) # negative x, xp because xp decreases

# Precision
precision = tpc / (tpc + fpc) # precision curve
p[ci] = np.interp(-px, -conf[i], precision[:, 0], left=1) # p at pr_score
p[ci] = np.interp(-px, -conf[i], precision[:, 0], left=0, right=0) # p at pr_score

# AP from recall-precision curve
for j in range(tp.shape[1]):
Expand Down Expand Up @@ -96,8 +96,8 @@ def compute_ap(recall, precision):
"""

# Append sentinel values to beginning and end
mrec = np.concatenate(([0.0], recall, [1.0]))
mpre = np.concatenate(([1.0], precision, [0.0]))
mrec = np.concatenate((recall, [recall[-1] + 0.001]))
mpre = np.concatenate((precision, [0.0]))

# Compute the precision envelope
mpre = np.flip(np.maximum.accumulate(np.flip(mpre)))
Expand Down