code: def _possibly_plot(self, A, eigs, X, m, matrix_name):
      if not os.getenv("LOBPCG_EMIT_DEBUG_PLOTS"):
          return
  
      if isinstance(A, (np.ndarray, jax.Array)):
          lobpcg = linalg._lobpcg_standard_matrix
      else:
          lobpcg = linalg._lobpcg_standard_callable
      _theta, _U, _i, info = lobpcg(A, X, m, tol=0, debug=True)
      plot_dir = os.getenv("TEST_UNDECLARED_OUTPUTS_DIR")
      assert (
          plot_dir
      ), "expected TEST_UNDECLARED_OUTPUTS_DIR for lobpcg plots"
      self._debug_plots(X, eigs, info, matrix_name, plot_dir)
  
imports: import functools
  import re
  import os
  import unittest
  from absl.testing import absltest
  from absl.testing import parameterized
  import numpy
  import scipy.linalg
  import scipy.sparse
  import jax
  from jax import config
  from jax._src import test_util
  from jax.experimental.sparse import linalg, bcoo
  import jax.numpy
label_desc: Use image node_id 3 for calling the LobpcgTest obj's underlying member method code with example usage: obj._possibly_plot(A, eigs, X, m, matrix_name) without return types