code: public SDVariable mergeAdd(String name, SDVariable... inputs) {
          validateSameType("mergeAdd", true, inputs);
          SDVariable ret = f().mergeAdd(inputs);
          return updateVariableNameAndReference(ret, name);
      }
docs: Merge add function: merges an arbitrary number of equal shaped arrays using element-wise addition:
  out = sum_i in[i]
  
  @param name   Name of the output variable
  @param inputs Input variables
  @return Output variable