def save_model(self, model_filename):
        line = "save_{}|".format(model_filename)
        self.vw_process.sendline(line)
        # No response is expected in this case
Pass a "command example" to the VW subprocess requesting
dataset/ETHPy150Open mokelly/wabbit_wappa/wabbit_wappa/__init__.py/VW.save_model