@Override
    public INDArray exec(Variance accumulation, boolean biasCorrected, int... dimension) {
        return processOp(accumulation).z();
    }
@Override
    public INDArray exec(Variance accumulation, boolean biasCorrected, int... dimension) {
        return processOp(accumulation).z();
    }
@ Override public INDArray exec ( Variance accumulation , boolean biasCorrected , int ... dimension ) { return processOp ( accumulation ) . z ( ) ; }
Execute an accumulation along one or more dimensions

@param accumulation  the accumulation
@param biasCorrected
@param dimension     the dimension  @return the accmulation op
Execute an accumulation along one or more dimensions