std::unique_ptr<CSession> csession(new CSession(graph_, s_));
    std::unique_ptr<CSession> expected_csession(
        new CSession(expected_graph_, s_));

    std::vector<TF_Output> grad_outputs_vec;
    grad_outputs_vec.assign(grad_outputs, grad_outputs + 2);
    csession->SetOutputs(grad_outputs_vec);
    csession->Run(s_);
    ASSERT_EQ(TF_OK, TF_GetCode(s_)) << TF_Message(s_);

    /**
     * Creates a derived session using the given local repository.
     *
     * @param localRepository the new local repository
     * @return the derived session
     * @throws NullPointerException if {@code localRepository} is null
     */
    @Nonnull
    Session withLocalRepository(@Nonnull LocalRepository localRepository);

    /**
     * Creates a derived session using the given remote repositories.
     *

        }

        InternalSession iSession = InternalSession.from(configuration.getRepositorySession());
        InternalMavenSession mSession = InternalMavenSession.from(iSession);
        MavenSession session = mSession.getMavenSession();

        session.setProjects(projects);
        session.setAllProjects(session.getProjects());

        return session;
    }

    protected void initRepoSession(

        DefaultSession iSession = new DefaultSession(
                msession, resolverRepositorySystem, null, mavenRepositorySystem, new DefaultLookup(container), null);
        InternalSession.associate(session, iSession);

        SessionScope sessionScope = container.lookup(SessionScope.class);
        sessionScope.enter();
        sessionScope.seed(MavenSession.class, msession);

        request.systemProperties(session.getSystemProperties());
        request.userProperties(session.getUserProperties());
        request.lifecycleBindingsInjector(lifecycleBindingsInjector::injectLifecycleBindings);
        ModelBuilder.ModelBuilderSession mbSession =
                iSession.getData().get(SessionData.key(ModelBuilder.ModelBuilderSession.class));
        return mbSession.build(request.build());
    }

                .build()) {
            MavenSession mSession = new MavenSession(repoSession, request, new DefaultMavenExecutionResult());
            InternalSession iSession = new SimpleSession(mSession, repoSystem, null);
            InternalSession.associate(repoSession, iSession);

            List<RemoteRepository> repositories = RepositoryUtils.toRepos(request.getPluginArtifactRepositories());

        injector.discover(ProtoSession.class.getClassLoader());
        Session session = injector.getInstance(Session.class);
        SessionScope scope = new SessionScope();
        scope.enter();
        scope.seed(Session.class, session);
        injector.bindScope(SessionScoped.class, scope);
        return session;
    }

                .setLocalRepository(getLocalRepository());

        DefaultRepositorySystemSession session = new DefaultRepositorySystemSession();
        LocalRepository localRepo =
                new LocalRepository(request.getLocalRepository().getBasedir());
        session.setLocalRepositoryManager(new SimpleLocalRepositoryManagerFactory().newInstance(session, localRepo));
        LegacySupport legacySupport = container.lookup(LegacySupport.class);

        session.setDependencyTraverser(getDependencyTraverser());
        session.setDependencyManager(getDependencyManager());
        session.setDependencySelector(getDependencySelector());
        session.setDependencyGraphTransformer(getDependencyGraphTransformer());
        session.setArtifactTypeRegistry(getArtifactTypeRegistry());

    const Graph& graph = session->graph->graph;

    const string& mutation_warning = session->graph->sessions[session];
    if (!mutation_warning.empty()) {
      // TODO(b/74949947): turn this back into an error status
      LOG(WARNING) << mutation_warning;
      session->graph->sessions[session].clear();
    }

    const auto num_nodes = graph.num_node_ids();