Golang LogSigmoid.ApplyR示例

示例#1

文件： cost_func.go 项目： unixpickle/weakai

func (_ SigmoidCECost) CostR(v autofunc.RVector, x linalg.Vector,
	a autofunc.RResult) autofunc.RResult {
	logsig := autofunc.LogSigmoid{}
	log := logsig.ApplyR(v, a)
	invLog := logsig.ApplyR(v, autofunc.ScaleR(a, -1))

	xVar := autofunc.NewRVariable(&autofunc.Variable{x}, v)
	oneMinusX := autofunc.AddScalerR(autofunc.ScaleR(xVar, -1), 1)

	sums := autofunc.AddR(autofunc.MulR(xVar, log), autofunc.MulR(oneMinusX, invLog))
	return autofunc.ScaleR(autofunc.SumAllR(sums), -1)
}