code: def _check_projs(projs, copy=True):
      """Check that projs is a list of Projection."""
      if not isinstance(projs, (list, tuple)):
          raise TypeError(
              f"projs must be a list or tuple, got {type(projs)}"
          )
      for pi, p in enumerate(projs):
          if not isinstance(p, Projection):
              raise TypeError(
                  "All entries in projs list must be Projection "
                  "instances, but projs[%d] is type %s" % (pi, type(p))
              )
      return deepcopy(projs) if copy else projs
  
imports: import re
  from copy import deepcopy
  from itertools import count
  import numpy
  from ..defaults import _BORDER_DEFAULT, _EXTRAPOLATE_DEFAULT, _INTERPOLATION_DEFAULT
  from ..fixes import _safe_svd
  from ..utils import _check_option, _validate_type, fill_doc, logger, object_diff, verbose, warn
  from .constants import FIFF
  from .pick import _ELECTRODE_CH_TYPES, _electrode_types, pick_info, pick_types
  from .tag import _rename_list, find_tag
  from .tree import dir_tree_find
  from .write import _safe_name_list, end_block, start_block, write_float, write_float_matrix, write_int, write_name_list_sanitized, write_string
label_desc: Use image node_id 4 for calling a global function with example usage: _check_projs(projs, copy) and returns: unknown