code: def _get_shape(self):
      shape = ()
      for v, count in self.variable_count:
          if hasattr(v, "shape"):
              for i in range(count):
                  shape += v.shape
      if hasattr(self.expr, "shape"):
          shape += self.expr.shape
      return shape
  
imports: from __future__ import annotations
  from sympy.core.expr import Expr
  from sympy.core.function import Derivative
  from sympy.core.numbers import Integer
  from sympy.matrices.matrixbase import MatrixBase
  from .ndim_array import NDimArray
  from .arrayop import derive_by_array
  from sympy.matrices.expressions.matexpr import MatrixExpr
  from sympy.matrices.expressions.special import ZeroMatrix
  from sympy.matrices.expressions.matexpr import _matrix_derivative
label_desc: Use image node_id 2 for calling the ArrayDerivative obj's underlying member method code with example usage: obj._get_shape() and returns: shape