code: def generate_test_vectorss():
      vss = vectorss()
      vss.append(generate_test_vectors())
      vss.append(generate_test_vectors())
      vss.append(generate_test_vectors())
      assert len(vss) == 3
      return vss
  
imports: from dlib import vector, vectors, vectorss, dot
  from pytest import raises
label_desc: Use image node_id 12 for calling a global function with example usage: generate_test_vectorss() and returns: vss