code: def write_header(self, output):
      # First is the matrix type.
      output.write(struct.pack("<B", self.get_matrix_type()))
      # Next comes the stream name.
      output.write(struct.pack("<I", len(self.name)))
      output.write(self.name.encode("ascii"))
      # Next is the elem type
      output.write(struct.pack("<B", self.element_type))
      # Finally, the sample dimension.
      output.write(struct.pack("<I", self.sample_dim))
  
imports: import sys
  import argparse
  import struct
  import os
  from collections import OrderedDict
label_desc: Use image node_id 2 for calling the Converter obj's underlying member method code with example usage: obj.write_header(output) without return types