code: def _assertLogsExist(self, log_dir):
      self.assertNotEmpty(os.listdir(log_dir))
  
file_path: model-optimization/tensorflow_model_optimization/python/core/sparsity/keras/pruning_callbacks_test.py
imports: import os
  import tempfile
  import numpy
  import tensorflow
  from tensorflow_model_optimization.python.core.keras import test_utils
  from tensorflow_model_optimization.python.core.sparsity.keras import prune
  from tensorflow_model_optimization.python.core.sparsity.keras import pruning_callbacks
label_desc: Use image node_id 1 for calling the PruneCallbacksTest obj's underlying member method code with example usage: obj._assertLogsExist(log_dir) without return types