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fix: focal loss

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Co-authored-by: Copilot <copilot@github.com>
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unanmed 2026-05-06 22:27:56 +08:00
parent 3ed3ad8238
commit f0025df1ec
1 changed files with 3 additions and 2 deletions
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5
ginka/utils.py
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@ -71,10 +71,11 @@ def masked_focal(
corrected = target.clone() corrected = target.clone()
corrected[~in_set] = 0 corrected[~in_set] = 0
# 逆频类别权重：batch 内频率越高，权重越小 # 逆频类别权重：用原始 target 统计频率，避免 corrected 中人工填 0 膨胀
# count[0]，导致 weight[0] 趋近于 0、非专属位置损失被消除的问题
class_weight = None class_weight = None
if balance: if balance:
flat = corrected.view(-1) # [B*S] flat = target.view(-1) # [B*S] 原始标签
counts = torch.bincount(flat, minlength=C).float() # [C] counts = torch.bincount(flat, minlength=C).float() # [C]
class_weight = flat.numel() / (counts.clamp(min=1.0) * C) class_weight = flat.numel() / (counts.clamp(min=1.0) * C)
class_weight[counts == 0] = 0.0 # 未出现类别不参与 class_weight[counts == 0] = 0.0 # 未出现类别不参与