code: def test_inv_can_transf_matrix():
      dimsys = DimensionSystem((length, mass, time))
      assert dimsys.inv_can_transf_matrix == eye(3)
  
file_path: sympy/sympy/physics/units/tests/test_dimensionsystem.py
imports: from sympy.core.symbol import symbols
  from sympy.matrices.dense import Matrix, eye
  from sympy.physics.units.definitions.dimension_definitions import action, current, length, mass, time, velocity
  from sympy.physics.units.dimensions import DimensionSystem
label_desc: Use image node_id 4 for calling a global function with example usage: test_inv_can_transf_matrix() without return types