code: def write_float_sparse_rcs(fid, kind, mat):
      """Write a single-precision sparse compressed row matrix tag."""
      return write_float_sparse(fid, kind, mat, fmt="csr")
  
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 33 for calling a global function with example usage: write_float_sparse_rcs(fid, kind, mat) and returns: write_float_sparse