code: public SDVariable reciprocal(String name, SDVariable a) {
          validateNumerical("reciprocal", a);
          SDVariable ret = f().reciprocal(a);
          return updateVariableNameAndReference(ret, name);
      }
docs: Element-wise reciprocal (inverse) function: out[i] = 1 / in[i]
  
  @param name Name of the output variable
  @param a    Input variable
  @return Output variable