code: def time_loadtxt_csv_struct_dtype(self):
      # obligate rewind of StringIO object
      # between iterations of a repeat:
  
      np.loadtxt(
          self.csv_data,
          delimiter=",",
          dtype=[
              ("category_1", "S1"),
              ("category_2", "i4"),
              ("category_3", "f8"),
              ("category_4", "S1"),
              ("category_5", "f8"),
          ],
      )
      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 LoadtxtCSVStructured obj's underlying member method code with example usage: obj.time_loadtxt_csv_struct_dtype() without return types