code: def __exit__(self, exc_type, exc_val, exc_tb):
      self.flush_page()
      self.fp.close()
  
file_path: ffcv/ffcv/memory_allocator.py
imports: import numpy
  from time import sleep
  from os import SEEK_END
  from multiprocessing import Value
  from .utils import align_to_page
  import ctypes
label_desc: Use image node_id 7 for calling the MemoryAllocator obj's underlying member method code with example usage: obj.__exit__(exc_type, exc_val, exc_tb) without return types