code: def generate_code(self) -> Callable:
      mem_read = self.memory_read
      my_memcpy = Compiler.compile(memcpy)
      my_range = Compiler.get_iterator()
  
      def decoder(batch_indices, destination, metadata, storage_state):
          for dest_ix in my_range(batch_indices.shape[0]):
              source_ix = batch_indices[dest_ix]
              data = mem_read(metadata[source_ix]["ptr"], storage_state)
              my_memcpy(data, destination[dest_ix])
          return destination
  
      return decoder
  
imports: from typing import Callable, TYPE_CHECKING, Tuple, Type
  from dataclasses import replace
  import numpy
  from .base import Field, ARG_TYPE
  from ..pipeline.operation import Operation
  from ..pipeline.state import State
  from ..pipeline.compiler import Compiler
  from ..pipeline.allocation_query import AllocationQuery
  from ..libffcv import memcpy
label_desc: Use image node_id 2 for calling the BytesDecoder obj's underlying member method code with example usage: obj.generate_code() and returns: decoder, destination