docs: public static INDArray normalizeZeroMeanAndUnitVariance(INDArray toNormalize) {
          INDArray columnMeans = toNormalize.mean(0);
          INDArray columnStds = toNormalize.std(0);
  
          toNormalize.subiRowVector(columnMeans);
          //padding for non zero
          columnStds.addi(Nd4j.EPS_THRESHOLD);
          toNormalize.diviRowVector(columnStds);
          return toNormalize;
      }