code: def generate_test_vectors():
      vs = vectors()
      vs.append(vector([0, 1, 2]))
      vs.append(vector([3, 4, 5]))
      vs.append(vector([6, 7, 8]))
      assert len(vs) == 3
      return vs
  
imports: from dlib import vector, vectors, vectorss, dot
  from pytest import raises
label_desc: Use image node_id 11 for calling a global function with example usage: generate_test_vectors() and returns: vs