code: def _read_julian(fid, tag, shape, rlims):
      """Read julian tag."""
      return _julian_to_cal(
          int(np.frombuffer(fid.read(4), dtype=">i4").item())
      )
  
imports: import html
  import re
  import struct
  from dataclasses import dataclass
  from functools import partial
  from typing import Any
  import numpy
  from scipy.sparse import csc_matrix, csr_matrix
  from ..utils import _check_option, warn
  from ..utils.numerics import _julian_to_cal
  from .constants import FIFF, _ch_coil_type_named, _ch_kind_named, _ch_unit_mul_named, _ch_unit_named, _dig_cardinal_named, _dig_kind_named
label_desc: Use image node_id 18 for calling a global function with example usage: _read_julian(fid, tag, shape, rlims) and returns: _julian_to_cal