code: def _plot_tick_bars(timestamps_i, ax, label):
      for t in timestamps_i:
          ax.axvline(x=t)
      ax.set_title(label, fontsize=20)
      ax.get_yaxis().set_visible(False)
  
file_path: tick/tick/plot/plot_point_processes.py
imports: import matplotlib.pyplot
  import numpy
  from typing import Optional, List
  from tick.hawkes.simulation.base import SimuPointProcess
label_desc: Use image node_id 2 for calling a global function with example usage: _plot_tick_bars(timestamps_i, ax, label) without return types