Saves symbol to a file.

        You can also use pickle to do the job if you only work on python.
        The advantage of `load`/`save` functions is that the file contents are language agnostic.
        This means the model saved by one language binding can be loaded by a different
        language binding of `MXNet`.
        You also get the benefit of being able to directly load/save from cloud storage(S3, HDFS).

        Parameters
        ----------
        fname : str
            The name of the file.

            - "s3://my-bucket/path/my-s3-symbol"
            - "hdfs://my-bucket/path/my-hdfs-symbol"
            - "/path-to/my-local-symbol"

        See Also
        --------
        symbol.load : Used to load symbol from file.

def save(self, fname):
        """Saves symbol to a file.

        You can also use pickle to do the job if you only work on python.
        The advantage of `load`/`save` functions is that the file contents are language agnostic.
        This means the model saved by one language binding can be loaded by a different
        language binding of `MXNet`.
        You also get the benefit of being able to directly load/save from cloud storage(S3, HDFS).

        Parameters
        ----------
        fname : str
            The name of the file.

            - "s3://my-bucket/path/my-s3-symbol"
            - "hdfs://my-bucket/path/my-hdfs-symbol"
            - "/path-to/my-local-symbol"

        See Also
        --------
        symbol.load : Used to load symbol from file.
        """
        if not isinstance(fname, string_types):
            raise TypeError('fname need to be string')
        check_call(_LIB.MXSymbolSaveToFile(self.handle, c_str(fname)))