code: def pytree_filter(fn, obj, process_types):
      if obj is None:
          return None
  
      filters = []
  
      def condition_append(obj):
          if fn(obj):
              filters.append(obj)
  
      pytree_map(obj, fn=condition_append, process_types=process_types)
      return filters
  
imports: import argparse
  import os
  import warnings
  from typing import Any, Callable, Tuple, Type, Union
  import torch
  import torch.distributed.rpc
  import torch.multiprocessing
  from torch._C._distributed_rpc import _is_current_rpc_agent_set
  from torch.futures import Future
  from colossalai.initialize import launch
  from colossalai.legacy.pipeline.pipeline_process_group import ppg
label_desc: Use image node_id 7 for calling a global function with example usage: pytree_filter(fn, obj, process_types) and returns: filters, None