GetForks.
        [Preview API] Retrieve all forks of a repository in the collection.
        :param str repository_name_or_id: The name or ID of the repository.
        :param str collection_id: Team project collection ID.
        :param str project: Project ID or project name
        :param bool include_links: True to include links.
        :rtype: [GitRepositoryRef]

def get_forks(self, repository_name_or_id, collection_id, project=None, include_links=None):
        """GetForks.
        [Preview API] Retrieve all forks of a repository in the collection.
        :param str repository_name_or_id: The name or ID of the repository.
        :param str collection_id: Team project collection ID.
        :param str project: Project ID or project name
        :param bool include_links: True to include links.
        :rtype: [GitRepositoryRef]
        """
        route_values = {}
        if project is not None:
            route_values['project'] = self._serialize.url('project', project, 'str')
        if repository_name_or_id is not None:
            route_values['repositoryNameOrId'] = self._serialize.url('repository_name_or_id', repository_name_or_id, 'str')
        if collection_id is not None:
            route_values['collectionId'] = self._serialize.url('collection_id', collection_id, 'str')
        query_parameters = {}
        if include_links is not None:
            query_parameters['includeLinks'] = self._serialize.query('include_links', include_links, 'bool')
        response = self._send(http_method='GET',
                              location_id='158c0340-bf6f-489c-9625-d572a1480d57',
                              version='5.1-preview.1',
                              route_values=route_values,
                              query_parameters=query_parameters)
        return self._deserialize('[GitRepositoryRef]', self._unwrap_collection(response))