code: def svd(expr):
      return UofSVD(expr), SofSVD(expr), VofSVD(expr)
  
imports: from sympy.matrices.expressions import MatrixExpr
  from sympy.assumptions.ask import Q
label_desc: Use image node_id 4 for calling a global function with example usage: svd(expr) and returns: UofSVD,  SofSVD,  VofSVD