code: def trace_dealloc(
      self, ref: List[ray.ObjectRef], loc: str, freed: bool
  ):
      ref = ref[0]  # Avoid Ray materializing the ref.
      size_bytes = self.allocated.get(ref, {}).get("size_bytes", 0)
      if freed:
          print(
              f"[mem_tracing] Freed {size_bytes} bytes at {loc}: {ref}"
          )
          if ref in self.allocated:
              self.cur_mem -= size_bytes
              self.deallocated[ref] = self.allocated.pop(ref)
              self.deallocated[ref]["dealloc_loc"] = loc
          if ref in self.deallocated:
              # This object reference is already deallocated.
              pass
          else:
              print(
                  f"[mem_tracing] WARNING: allocation of {ref} was not traced!"
              )
      else:
          print(
              f"[mem_tracing] Skipped freeing {size_bytes} bytes at {loc}: {ref}"
          )
          self.skip_dealloc[ref] = loc
  
file_path: ray/python/ray/data/_internal/memory_tracing.py
imports: from io import StringIO
  from typing import Dict, List
  import ray
  from ray.data.context import DataContext
label_desc: Use image node_id 3 for calling the _MemActor obj's underlying member method code with example usage: obj.trace_dealloc(ref, loc, freed) without return types