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@@ -261,12 +261,11 @@ class CopyvioWorkspace(object): |
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"""Return the confidence of a violation as a float between 0 and 1.""" |
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def conf_with_article_and_delta(article, delta): |
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"""Calculate confidence using the article and delta chain sizes.""" |
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# This piecewise function, C_AΔ(Δ), was defined such that |
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# confidence exhibits exponential growth until it reaches the |
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# default "suspect" confidence threshold, at which point it |
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# transitions to polynomial growth with lim (A/Δ)→1 C_AΔ(A,Δ) = 1. |
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# A graph can be viewed here: |
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# http://benkurtovic.com/static/article-delta_confidence_function.pdf |
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# This piecewise function exhibits exponential growth until it |
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# reaches the default "suspect" confidence threshold, at which |
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# point it transitions to polynomial growth with a limit of 1 as |
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# (delta / article) approaches 1. |
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# A graph can be viewed here: http://goo.gl/mKPhvr |
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ratio = delta / article |
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if ratio <= 0.52763: |
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return -log(1 - ratio) |
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@@ -275,11 +274,10 @@ class CopyvioWorkspace(object): |
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def conf_with_delta(delta): |
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"""Calculate confidence using just the delta chain size.""" |
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# This piecewise function, C_Δ(Δ), was derived from experimental |
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# data using reference points at (0, 0), (100, 0.5), (250, 0.75), |
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# (500, 0.9), and (1000, 0.95) with lim Δ→+∞ C_Δ(Δ) = 1. |
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# A graph can be viewed here: |
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# http://benkurtovic.com/static/delta_confidence_function.pdf |
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# This piecewise function was derived from experimental data using |
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# reference points at (0, 0), (100, 0.5), (250, 0.75), (500, 0.9), |
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# and (1000, 0.95), with a limit of 1 as delta approaches infinity. |
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# A graph can be viewed here: http://goo.gl/lVl7or |
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if delta <= 100: |
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return delta / (delta + 100) |
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elif delta <= 250: |
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