code: def time_loadtxt_usecols_csv(self, usecols):
      # must rewind StringIO because of state
      # dependence of file reading
      np.loadtxt(self.csv_data, delimiter=",", usecols=usecols)
      self.csv_data.seek(0)
  
imports: from .common import Benchmark, get_squares, get_squares_
  import numpy
  from io import SEEK_SET, StringIO, BytesIO
label_desc: Use image node_id 2 for calling the LoadtxtUseColsCSV obj's underlying member method code with example usage: obj.time_loadtxt_usecols_csv(usecols) without return types