code: def tt_vonneumann_entropy(tensor):
      """Returns the von Neumann entropy of a density matrix (square matrix) in TT tensor form.
  
      Parameters
      ----------
      tensor : (TT tensor)
          Data structure
  
      Returns
      -------
      tt_von_neumann_entropy : order-0 tensor
      """
  
      return vonneumann_entropy(tt_to_tensor(tensor))
  
imports: import math
  import tensorly
  from ..None import backend
  from ..tt_tensor import tt_to_tensor
label_desc: Use image node_id 2 for calling a global function with example usage: tt_vonneumann_entropy(tensor) and returns: vonneumann_entropy