code: def _validate_initializer_input(initializer):
      if isinstance(initializer, str):
          try:
              initializer = GeneralInitializer(initializer)
          except:
              raise ValueError(
                  "Invalid initializer string input - must match pytorch function."
              )
          return initializer
      elif callable(initializer):
          return initializer
      else:
          raise ValueError("Invalid optimizer input")
  
file_path: pywick/pywick/modules/_utils.py
imports: import datetime
  import warnings
  import torch.nn.functional
  import torch.optim
  from ..metrics import Metric, CategoricalAccuracy, BinaryAccuracy
  from ..initializers import GeneralInitializer
label_desc: Use image node_id 8 for calling a global function with example usage: _validate_initializer_input(initializer) and returns: initializer, initializer