code: def test_pdf_logpdf(self):
      check_pdf_logpdf(lognorm_gen(0, 1), args=(), msg="base case")
      check_pdf_logpdf(
          lognorm_gen(mu=-4, sigma=0.5),
          args=(),
          msg="non-default mu, sigma",
      )
  
imports: from collections import defaultdict
  import unittest
  import numpy
  import numpy.testing
  from hyperopt.rdists import loguniform_gen, lognorm_gen, quniform_gen, qloguniform_gen, qnormal_gen, qlognormal_gen
  from scipy import stats
  from scipy.stats.tests.test_continuous_basic import check_cdf_logcdf, check_pdf_logpdf, check_pdf, check_cdf_ppf
label_desc: Use image node_id 3 for calling the TestLogNormal obj's underlying member method code with example usage: obj.test_pdf_logpdf() without return types