code: def state_type(self):
      t1 = nb.uint8[::1]
      t1.multable = False
      t2 = nb.uint64[::1]
      t1.mutable = False
      return nb.types.Tuple([t1, t2, t2])
  
file_path: ffcv/ffcv/memory_managers/os_cache.py
imports: from typing import TYPE_CHECKING
  import numpy
  import numba
  from .base import MemoryManager, MemoryContext
  from ..pipeline.compiler import Compiler
label_desc: Use image node_id 3 for calling the OSCacheManager obj's underlying member method code with example usage: obj.state_type() and returns: nb