class_docstr: A computed beamformer.
  
  Notes
  -----
  .. versionadded:: 0.17
docstr: Save the beamformer filter.
  
  Parameters
  ----------
  fname : path-like
      The filename to use to write the HDF5 data.
      Should end in ``'-lcmv.h5'`` or ``'-dics.h5'``.
  %(overwrite)s
  %(verbose)s
docstr_tok: ["Save","the","beamformer","filter",".","Parameters","--","--","--","--","--","fname",":","path-like","The","filename","to","use","to","write","the","HDF5","data",".","Should","end","in","``","'-lcmv.h5","'","``","or","``","'-dics.h5","'","``",".","%","(","overwrite",")","s","%","(","verbose",")","s"]
code: def save(self, fname, overwrite=False, verbose=None):
      """Save the beamformer filter.
  
      Parameters
      ----------
      fname : path-like
          The filename to use to write the HDF5 data.
          Should end in ``'-lcmv.h5'`` or ``'-dics.h5'``.
      %(overwrite)s
      %(verbose)s
      """
      _, write_hdf5 = _import_h5io_funcs()
  
      ending = f'-{self["kind"].lower()}.h5'
      check_fname(fname, self["kind"], (ending,))
      csd_orig = None
      try:
          if "csd" in self:
              csd_orig = self["csd"]
              self["csd"] = self["csd"].__getstate__()
          write_hdf5(
              fname, self, overwrite=overwrite, title="mnepython"
          )
      finally:
          if csd_orig is not None:
              self["csd"] = csd_orig
  
imports: from copy import deepcopy
  import numpy
  from .._fiff.proj import Projection, make_projector
  from ..cov import Covariance, make_ad_hoc_cov
  from ..forward.forward import _restrict_forward_to_src_sel, is_fixed_orient
  from ..minimum_norm.inverse import _get_vertno, _prepare_forward
  from ..source_space._source_space import label_src_vertno_sel
  from ..time_frequency.csd import CrossSpectralDensity
  from ..utils import _check_option, _check_src_normal, _import_h5io_funcs, _pl, _reg_pinv, _sym_mat_pow, check_fname, logger, verbose, warn
label_desc: Use image node_id 3 for calling the Beamformer obj's underlying member method code with example usage: obj.save(fname, overwrite, verbose) without return types