code: def test_vector_empty_init():
      v = vector()
      assert len(v) == 0
      assert v.shape == (0, 1)
      assert str(v) == ""
      assert repr(v) == "dlib.vector([])"
  
imports: from dlib import vector, vectors, vectorss, dot
  from pytest import raises
label_desc: Use image node_id 1 for calling a global function with example usage: test_vector_empty_init() without return types