code: def get_uint_info(self, field):
          
          length = ctypes.c_ulong()
          ret = ctypes.POINTER(ctypes.c_uint)()
          _check_call(_LIB.XGDMatrixGetUIntInfo(self.handle,
                                                c_str(field),
                                                ctypes.byref(length),
                                                ctypes.byref(ret)))
          return ctypes2numpy(ret, length.value, np.uint32)
docs: Get unsigned integer property from the DMatrix.
  
          Parameters
          ----------
          field: str
              The field name of the information
  
          Returns
          -------
          info : array
              a numpy array of float information of the data