code: def calc_gross_value(long_value, short_value):
      return long_value + abs(short_value)
  
imports: from __future__ import division
  import logbook
  import numpy
  from collections import namedtuple
  from math import isnan
  from six import iteritems, itervalues
  from catalyst.finance.performance.position import Position
  from catalyst.finance.transaction import Transaction
  from catalyst.utils.input_validation import expect_types
  import catalyst.protocol
  from catalyst.assets import Future, Asset
  from .position import positiondict
  from catalyst.constants import LOG_LEVEL
label_desc: Use image node_id 11 for calling a global function with example usage: calc_gross_value(long_value, short_value) and returns: unknown