code: def checkvolume(d0, d1):
      return d0.volume[0] < d1.volume[0]
  
file_path: backtrader/samples/rollover/rollover.py
imports: from __future__ import absolute_import, division, print_function, unicode_literals
  import argparse
  import bisect
  import calendar
  import datetime
  import backtrader
label_desc: Use image node_id 2 for calling a global function with example usage: checkvolume(d0, d1) and returns: unknown