code: def _normalize_transform(transforms):
      """Normalize transform to MultiParamTransform."""
      if transforms is None:
          return None
      if not isinstance(transforms, MultiParamTransform):
          if isinstance(transforms, Sequence):
              return TupleTransform(transforms)
          else:
              return TupleTransform([transforms])
      return transforms
  
imports: from collections import defaultdict
  from functools import partial
  from typing import Any, Dict, List, Mapping, Optional, Tuple, Union, Callable, Sequence
  from typing_extensions import Protocol
  from avalanche.benchmarks.utils.transforms import MultiParamCompose, TupleTransform, MultiParamTransform
label_desc: Use image node_id 2 for calling a global function with example usage: _normalize_transform(transforms) and returns: transforms, None, TupleTransform, TupleTransform