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25 lines
412 B
25 lines
412 B
12 months ago
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package mathx
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import "math"
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const epsilon = 1e-6
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func CalcEntropy(m map[any]int) float64 {
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if len(m) == 0 || len(m) == 1 {
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return 1
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}
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var entropy float64
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var total int
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for _, v := range m {
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total += v
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}
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for _, v := range m {
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probe := float64(v) / float64(total)
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if probe < epsilon {
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probe = epsilon
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}
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entropy -= probe * math.Log2(probe)
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}
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return entropy / math.Log2(float64(len(m)))
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}
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