code: def time_loadtxt_dtypes_csv(self, dtype, num_lines):
      # benchmark loading arrays of various dtypes
      # from csv files
  
      # state-dependent timing benchmark requires
      # rewind of StringIO object
  
      np.loadtxt(self.csv_data, delimiter=",", dtype=dtype)
      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 LoadtxtCSVdtypes obj's underlying member method code with example usage: obj.time_loadtxt_dtypes_csv(dtype, num_lines) without return types