def unpublish_iteration(<EOL>self, project_id, iteration_id, custom_headers=None, raw=False, **operation_config):
<EOL>url = self.unpublish_iteration.metadata['<STR_LIT:url>']<EOL>path_format_arguments = {<EOL>'<STR_LIT>': self._serialize.url("<STR_LIT>", self.config.endpoint, '<STR_LIT:str>', skip_quote=True),<EOL>'<STR_LIT>': self._serialize.url("<STR_LIT>", project_id, '<STR_LIT:str>'),<EOL>'<STR_LIT>': self._serialize.url("<STR_LIT>", iteration_id, '<STR_LIT:str>')<EOL>}<EOL>url = self._client.format_url(url, **path_format_arguments)<EOL>query_parameters = {}<EOL>header_parameters = {}<EOL>if custom_headers:<EOL><INDENT>header_parameters.update(custom_headers)<EOL><DEDENT>header_parameters['<STR_LIT>'] = self._serialize.header("<STR_LIT>", self.config.api_key, '<STR_LIT:str>')<EOL>request = self._client.delete(url, query_parameters, header_parameters)<EOL>response = self._client.send(request, stream=False, **operation_config)<EOL>if response.status_code not in [<NUM_LIT>]:<EOL><INDENT>raise models.CustomVisionErrorException(self._deserialize, response)<EOL><DEDENT>if raw:<EOL><INDENT>client_raw_response = ClientRawResponse(None, response)<EOL>return client_raw_response<EOL><DEDENT>
Unpublish a specific iteration.

        :param project_id: The project id.
        :type project_id: str
        :param iteration_id: The iteration id.
        :type iteration_id: str
        :param dict custom_headers: headers that will be added to the request
        :param bool raw: returns the direct response alongside the
         deserialized response
        :param operation_config: :ref:`Operation configuration
         overrides<msrest:optionsforoperations>`.
        :return: None or ClientRawResponse if raw=true
        :rtype: None or ~msrest.pipeline.ClientRawResponse
        :raises:
         :class:`CustomVisionErrorException<azure.cognitiveservices.vision.customvision.training.models.CustomVisionErrorException>`