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/external/apache-commons-math/src/main/java/org/apache/commons/math/optimization/general/
DNonLinearConjugateGradientOptimizer.java178 final double deltaOld = delta; in doOptimize() local
187 beta = delta / deltaOld; in doOptimize()
193 beta = (delta - deltaMid) / deltaOld; in doOptimize()