def connect(self): 
        try:
            self.connection = pymongo.Connection(self.host, self.port)
            self.db = self.connection[self.name]
        except AutoReconnect:
            raise DatabaseException("It's not possible connect to the database")
def residual_with_slice_fn(inp, out):
      inp_sliced = array_ops.slice(inp, [0, 0], [-1, 3])
      return inp_sliced + out