code: def test_make_valid_tf_name():
      mvn = make_valid_tf_name
      assert mvn("This/is/valid") == "This/is/valid"
      assert mvn("0-This/is/valid") == "0-This/is/valid"
      assert mvn(".This/is/valid") == ".This/is/valid"
      assert mvn(" This/is invalid") == "._This/is_invalid"
      assert mvn("-This-is-invalid") == ".-This-is-invalid"
  
file_path: tensorboard_logger/tests/test_tensorboard_logger.py
imports: import time
  import os
  import glob
  import numpy
  from tensorboard_logger import Logger, configure, log_value
  from tensorboard_logger.tensorboard_logger import make_valid_tf_name
label_desc: Use image node_id 5 for calling a global function with example usage: test_make_valid_tf_name() without return types