code: def _line_count(path):
      return int(
          subprocess.check_output(
              "wc -l {}".format(path), shell=True
          ).split()[0]
      )
  
file_path: mxnet/benchmark/python/sparse/dot.py
imports: import ctypes
  import os
  import time
  import argparse
  import subprocess
  import scipy.sparse
  import mxnet
  import numpy
  import numpy.random
  from mxnet.test_utils import rand_ndarray, set_default_device, assert_almost_equal, get_bz2_data
  from mxnet.base import check_call, _LIB
  from util import estimate_density
label_desc: Use image node_id 3 for calling a global function with example usage: _line_count(path) and returns: int