code: def _fit_magnetic_dipole(
      B_orig, x0, too_close, whitener, coils, guesses
  ):
      """Fit a single bit of data (x0 = pos)."""
      B = np.dot(whitener, B_orig)
      B2 = np.dot(B, B)
      objective = partial(
          _magnetic_dipole_objective,
          B=B,
          B2=B2,
          coils=coils,
          whitener=whitener,
          too_close=too_close,
      )
      if guesses is not None:
          res0 = objective(x0)
          res = _magnetic_dipole_delta_multi(
              guesses["whitened_fwd_svd"], B, B2
          )
          assert res.shape == (guesses["rr"].shape[0],)
          idx = np.argmin(res)
          if res[idx] < res0:
              x0 = guesses["rr"][idx]
      x = fmin_cobyla(
          objective, x0, (), rhobeg=1e-3, rhoend=1e-5, disp=False
      )
      gof, moment = objective(x, return_moment=True)
      gof = 1.0 - gof / B2
      return x, gof, moment
  
imports: import copy
  import itertools
  from functools import partial
  import numpy
  from scipy.linalg import orth
  from scipy.optimize import fmin_cobyla
  from scipy.spatial.distance import cdist
  from ._fiff.constants import FIFF
  from ._fiff.meas_info import Info, _simplify_info
  from ._fiff.pick import _picks_to_idx, pick_channels, pick_channels_regexp, pick_info, pick_types
  from ._fiff.proj import Projection, setup_proj
  from .channels.channels import _get_meg_system
  from .cov import compute_whitener, make_ad_hoc_cov
  from .dipole import _make_guesses
  from .event import find_events
  from .fixes import jit
  from .forward import _concatenate_coils, _create_meg_coils, _magnetic_dipole_field_vec
  from .io import BaseRaw
  from .io.ctf.trans import _make_ctf_coord_trans_set
  from .io.kit.constants import KIT
  from .io.kit.kit import RawKIT
  from .preprocessing.maxwell import _get_mf_picks_fix_mags, _prep_mf_coils, _regularize_out, _sss_basis
  from .transforms import _angle_between_quats, _fit_matched_points, _quat_to_affine, als_ras_trans, apply_trans, invert_transform, quat_to_rot, rot_to_quat
  from .utils import ProgressBar, _check_fname, _check_option, _on_missing, _pl, _validate_type, _verbose_safe_false, logger, use_log_level, verbose, warn
label_desc: Use image node_id 11 for calling a global function with example usage: _fit_magnetic_dipole(B_orig, x0, too_close, whitener, coils, guesses) and returns: x,  gof,  moment