code: def setup(self):
      num_lines = 50000
      data = ["M, 21, 72, X, 155"] * num_lines
      self.csv_data = StringIO("\n".join(data))
  
imports: from .common import Benchmark, get_squares, get_squares_
  import numpy
  from io import SEEK_SET, StringIO, BytesIO
label_desc: Use image node_id 1 for calling the LoadtxtCSVStructured obj's underlying member method code with example usage: obj.setup() without return types