code: def compile_reader(self):
      def read(address, mem_state):
          size = mem_state[2][np.searchsorted(mem_state[1], address)]
          return mem_state[0][address : address + size]
  
      return Compiler.compile(
          read, nb.uint8[::1](nb.uint64, self.state_type)
      )
  
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 4 for calling the OSCacheManager obj's underlying member method code with example usage: obj.compile_reader() and returns: Compiler, mem_state