if (gradientNorm && sampleVariance && batchSize)
    {
      if (batchSize < function.NumFunctions())
      {
        stepSizeDecay = (1 - (1 / ((double) batchSize - 1) * sampleVariance) /
            (batchSize * gradientNorm)) / batchSize;
        // Here it should be v in-place of  batchSize. Where v is calcuated using
        // Equation 9 on page 8 of https://arxiv.org/pdf/1610.05792.pdf

      }
      else
      {
        stepSizeDecay = 1 / function.NumFunctions();
       // similarly here it should be v instead of  function.NumFunctions();
      }
    }