How to use the leidenalg.ALL_COMMS function in leidenalg

def test_neg_weight_bipartite(self):
    G = ig.Graph.Full_Bipartite(50, 50);
    G.es['weight'] = -0.1;
    partition = leidenalg.CPMVertexPartition(G, resolution_parameter=-0.1, weights='weight');
    self.optimiser.consider_comms=leidenalg.ALL_COMMS;
    self.optimiser.optimise_partition(partition);
    self.assertListEqual(
        partition.sizes(), 2*[50],
        msg="After optimising partition failed to find bipartite structure with CPMVertexPartition(resolution_parameter=-0.1)");