code: def _is_valid_annotations_list(anns):
      return all([_is_valid_annotation(ann) for ann in anns])
  
imports: from __future__ import print_function
  from __future__ import division
  from __future__ import absolute_import
  import turicreate
label_desc: Use image node_id 4 for calling a global function with example usage: _is_valid_annotations_list(anns) and returns: all