code: public SDVariable variance(String name, @NonNull SDVariable x, boolean biasCorrected, int... dimensions) {
          return variance(name, x, biasCorrected, false, dimensions);
      }
docs: Variance array reduction operation, optionally along specified dimensions
  
  @param name          Output variable name
  @param x             Input variable
  @param biasCorrected If true: divide by (N-1) (i.e., sample variable). If false: divide by N (population variance)
  @param dimensions    Dimensions to reduce over. If dimensions are not specified, full array reduction is performed
  @return Output variable: reduced array of rank (input rank - num dimensions)