code: def write_double_matrix(fid, kind, mat):
      """Write a double-precision floating-point matrix tag."""
      _write_matrix_data(fid, kind, mat, FIFF.FIFFT_DOUBLE)
  
imports: import os.path
  import re
  import time
  import uuid
  from contextlib import contextmanager
  from gzip import GzipFile
  import numpy
  from scipy.sparse import csc_matrix, csr_matrix
  from ..utils import _file_like, _validate_type, logger
  from ..utils.numerics import _cal_to_julian
  from .constants import FIFF
label_desc: Use image node_id 16 for calling a global function with example usage: write_double_matrix(fid, kind, mat) without return types