def get_single_voxel_lineNobranches():
    # graph of no branches single line
    sampleLine = get_single_voxel_line()
    skel = Skeleton(sampleLine)
    skel.setNetworkGraph(False)
    return skel.graph
def get_cycles_with_branches_protrude():
    # graph of a cycle with branches
    sampleImage = get_tiny_loop_with_branches()
    skel = Skeleton(sampleImage)
    skel.setNetworkGraph(False)
    return skel.graph
def get_disjoint_trees_no_cycle_3d():
    # graph of two disjoint trees
    crosPair = get_disjoint_crosses()
    skel = Skeleton(crosPair)
    skel.setNetworkGraph(False)
    return skel.graph
def get_cycle_no_tree():
    # graph of a cycle
    donut = get_donut()
    skel = Skeleton(donut)
    skel.setNetworkGraph(True)
    return skel.graph