code: public SDVariable zeroFraction(String name, SDVariable input) {
          validateNumerical("zeroFraction", input);
          SDVariable res = f().zeroFraction(input);
          return updateVariableNameAndReference(res, name);
      }
docs: Full array zero fraction array reduction operation, optionally along specified dimensions: out = (count(x == 0) / length(x))
  
  @param name  Name of the output variable
  @param input Input variable
  @return Reduced array of rank 0 (scalar)