code: def test_empty_hash(self):
      x = constant(np.array([], dtype=np.int64))
      y = constant(np.array([], dtype=np.int64))
  
      x_sig = x.signature()
      y_sig = y.signature()
  
      assert hash(x_sig) == hash(y_sig)
  
imports: from copy import copy
  import numpy
  import pytest
  from numpy.testing import assert_array_equal, assert_equal, assert_string_equal
  import pytensor
  import tests.unittest_tools
  from pytensor.compile import DeepCopyOp
  from pytensor.compile.mode import get_default_mode
  from pytensor.graph.basic import Constant, equal_computations
  from pytensor.tensor import get_vector_length
  from pytensor.tensor.basic import constant
  from pytensor.tensor.elemwise import DimShuffle
  from pytensor.tensor.math import dot, eq, matmul
  from pytensor.tensor.shape import Shape
  from pytensor.tensor.subtensor import AdvancedSubtensor, Subtensor, inc_subtensor, set_subtensor
  from pytensor.tensor.type import TensorType, cscalar, dmatrix, dscalar, dvector, iscalar, ivector, matrices, matrix, scalar, tensor3
  from pytensor.tensor.type_other import MakeSlice, NoneConst
  from pytensor.tensor.variable import DenseTensorConstant, DenseTensorVariable, TensorConstant, TensorVariable
  from tests.tensor.utils import random
label_desc: Use image node_id 3 for calling the TestTensorConstantSignature obj's underlying member method code with example usage: obj.test_empty_hash() without return types