code: def _correct_trans(t, check=True):
      """Convert to a transformation matrix."""
      t = np.array(t, np.float64)
      t[:3, :3] *= t[3, :3][:, np.newaxis]  # apply scalings
      t[3, :3] = 0.0  # remove them
      if check:
          assert t[3, 3] == 1.0
      else:
          t[3, 3] = 1.0
      return t
  
imports: import functools
  import os.path
  from io import BytesIO
  from itertools import count
  import numpy
  from ..._fiff._digitization import _make_bti_dig_points
  from ..._fiff.constants import FIFF
  from ..._fiff.meas_info import _empty_info
  from ..._fiff.tag import _coil_trans_to_loc, _loc_to_coil_trans
  from ..._fiff.utils import _mult_cal_one, read_str
  from ...transforms import Transform, combine_transforms, invert_transform
  from ...utils import _stamp_to_dt, _validate_type, logger, path_like, verbose
  from ..base import BaseRaw
  from .constants import BTI
  from .read import read_char, read_dev_header, read_double, read_double_matrix, read_float, read_float_matrix, read_int16, read_int16_matrix, read_int32, read_int64, read_transform, read_uint16, read_uint32
label_desc: Use image node_id 20 for calling a global function with example usage: _correct_trans(t, check) and returns: t