code: def test_error_shape_mismatch(self):
      x = np.zeros((3, 3, 2, 3), int)
      with assert_raises_regex(ValueError, "equal length"):
          diag_indices_from(x)
  
imports: import pytest
  import numpy
  from numpy.testing import assert_, assert_equal, assert_array_equal, assert_almost_equal, assert_array_almost_equal, assert_raises, assert_raises_regex
  from numpy.lib._index_tricks_impl import mgrid, ogrid, ndenumerate, fill_diagonal, diag_indices, diag_indices_from, index_exp, ndindex, c_, r_, s_, ix_
label_desc: Use image node_id 3 for calling the TestDiagIndicesFrom obj's underlying member method code with example usage: obj.test_error_shape_mismatch() without return types