def main(argv):
_, library1, library2, max_num_nodes = argv
builder = GraphBuilder(library1, max_num_nodes=int(max_num_nodes))
builder.add_root(library2)
errors = builder.build()
builder.freeze()
compute_vector(builder, library1)
node1 = builder.nodes[library1]
compute_vector(builder, library2)
node2 = builder.nodes[library2]
angle = angle_between_nodes(node1, node2)
print 'Angle between `%s\' and `%s\' is %f' % (library1, library2, angle)
