code: def tempfile():
      """A temporary filename in the GDAL '/vsimem' filesystem"""
      return "/vsimem/{}".format(uuid.uuid4())
  
file_path: rasterio/tests/test_gdal_raster_io.py
imports: import logging
  import sys
  import uuid
  import numpy
  import pytest
  import rasterio
label_desc: Use image node_id 1 for calling a global function with example usage: tempfile() and returns: str