28 lines
565 B
Go
28 lines
565 B
Go
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package types
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import "math"
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type SigmoidResult struct {
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a Series
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}
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func (s *SigmoidResult) Last(i int) float64 {
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return 1. / (1. + math.Exp(-s.a.Last(i)))
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}
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func (s *SigmoidResult) Index(i int) float64 {
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return s.Last(i)
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}
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func (s *SigmoidResult) Length() int {
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return s.a.Length()
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}
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// Sigmoid returns the input values in range of -1 to 1
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// along the sigmoid or s-shaped curve.
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// Commonly used in machine learning while training neural networks
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// as an activation function.
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func Sigmoid(a Series) SeriesExtend {
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return NewSeries(&SigmoidResult{a})
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}
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