code: def file_exists_with_prefix(file_path, prefix=None):
      if prefix is None:
          return file_exists(file_path)
      filename = os.path.basename(file_path)
      if filename.startswith(prefix):
          return True
      return False
  
imports: import shutil
  from mxboard import SummaryWriter
  from mxboard.utils import _make_metadata_tsv, make_image_grid, _make_sprite_image
  from mxboard.utils import _add_embedding_config, _save_embedding_tsv, _get_embedding_dir
  from mxboard.summary import _get_nodes_from_symbol, _net2pb
  from mxboard.proto.node_def_pb2 import NodeDef
  from mxboard.proto.attr_value_pb2 import AttrValue
  from mxboard.proto.graph_pb2 import GraphDef
  from mxboard.proto.versions_pb2 import VersionDef
  from mxnet.test_utils import *
  from mxnet.gluon import nn
  import mxnet
  from common import with_seed, setup_module
  from nose.tools import make_decorator
label_desc: Use image node_id 9 for calling a global function with example usage: file_exists_with_prefix(file_path, prefix) and returns: False, file_exists, True