class_docstr: An object tracking the updates of an ongoing training with progress bars and a nice table reporting metrics.
  
  Args:
      num_steps (`int`): The number of steps during training. column_names (`List[str]`, *optional*):
          The list of column names for the metrics table (will be inferred from the first call to
          [`~utils.notebook.NotebookTrainingTracker.write_line`] if not set).
docstr: Closes the child progress bar.
docstr_tok: ["Closes","the","child","progress","bar","."]
code: def remove_child(self):
      """
      Closes the child progress bar.
      """
      self.child_bar = None
      self.display()
  
imports: import re
  import time
  from typing import Optional
  import IPython.display
  from ..trainer_callback import TrainerCallback
  from ..trainer_utils import IntervalStrategy, has_length
label_desc: Use image node_id 5 for calling the NotebookTrainingTracker obj's underlying member method code with example usage: obj.remove_child() without return types