code: public SDVariable assign(String name, SDVariable x, SDVariable y) {
          SDVariable ret = f().assign(x, y);
          return updateVariableNameAndReference(ret, name);
      }
docs: Assign/copy op: out = x.assign(y). Supports broadcasting
  
  @param name Name of the output variable
  @param x    Input variable x
  @param y    Input variable y
  @return Output variable