fix: _bhattacharyya_coefficient 用 x**0.5 替代 np.sqrt
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回应 AI Code Review:虽然 numpy 已在模块顶部导入(第21行), 但该方法是纯标量计算,改用 Python 原生 ** 0.5 更清晰且无额外依赖。 直方图值均为非负,与 math.sqrt 数学等价。
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@@ -277,6 +277,9 @@ class VideoDeduplicator:
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def _bhattacharyya_coefficient(hist_a: list[float], hist_b: list[float]) -> float:
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"""Bhattacharyya 系数:Σ √(a[i] * b[i]),范围 [0, 1],1=完全相同。
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直方图值均为非负浮点数,用 ``x ** 0.5`` 替代 ``np.sqrt``,
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避免在此纯标量计算中引入对 numpy 的额外依赖。
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Args:
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hist_a: 第一组直方图数据
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hist_b: 第二组直方图数据
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@@ -287,7 +290,7 @@ class VideoDeduplicator:
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min_len = min(len(hist_a), len(hist_b))
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a = hist_a[:min_len]
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b = hist_b[:min_len]
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return float(sum(np.sqrt(ai * bi) for ai, bi in zip(a, b)))
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return float(sum((ai * bi) ** 0.5 for ai, bi in zip(a, b)))
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@staticmethod
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def _compute_histogram_similarity(
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