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sigmoid.go
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sigmoid.go
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// Copyright © 2017 Makoto Ito
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package model
import (
"math"
"github.com/chewxy/math32"
)
// SigmoidF64 returns f(x) = \frac{1}{1 + e^{-x}}.
// See: http://en.wikipedia.org/wiki/Sigmoid_function.
func SigmoidF64(f float64) float64 {
exp := math.Exp(f)
if math.IsInf(exp, 1) {
return 1.0
}
return exp / (1.0 + exp)
}
// SigmoidF32 returns f(x) = \frac{1}{1 + e^{-x}}.
func SigmoidF32(f float32) float32 {
exp := math32.Exp(f)
if math32.IsInf(exp, 1) {
return float32(1.0)
}
return exp / (float32(1.0) + exp)
}