Golang LogSigmoid.Apply示例

示例#1

文件： cost_func.go 项目： unixpickle/weakai

func (_ SigmoidCECost) Cost(x linalg.Vector, a autofunc.Result) autofunc.Result {
	logsig := autofunc.LogSigmoid{}
	log := logsig.Apply(a)
	invLog := logsig.Apply(autofunc.Scale(a, -1))

	xVar := &autofunc.Variable{x}
	oneMinusX := autofunc.AddScaler(autofunc.Scale(xVar, -1), 1)

	sums := autofunc.Add(autofunc.Mul(xVar, log), autofunc.Mul(oneMinusX, invLog))
	return autofunc.Scale(autofunc.SumAll(sums), -1)
}