code: def base(self):
      return self.args[0]
  
imports: from .matexpr import MatrixExpr
  from .special import Identity
  from sympy.core import S
  from sympy.core.expr import ExprBuilder
  from sympy.core.cache import cacheit
  from sympy.core.power import Pow
  from sympy.core.sympify import _sympify
  from sympy.matrices import MatrixBase
  from sympy.matrices.exceptions import NonSquareMatrixError
label_desc: Use image node_id 2 for calling the MatPow obj's underlying member method code with example usage: obj.base() and returns: self