fix hf gpt2 example

examples/hf_gpt2/hf_gpt2.py

@@ -15,7 +15,8 @@
 from energonai.nn import VocabParallelEmbedding1D
 from torch.nn import Embedding
 from energonai.utils import get_current_device, is_using_pp
-from energonai.utils.checkpointing_hf_gpt2 import load_checkpoint
+from energonai.utils.checkpointing import load_checkpoint
+from energonai.utils.checkpointing_hf_gpt2 import processing_HF_GPT
 
 
 __all__ = [
@@ -479,7 +480,7 @@ def _create_gpt_pipeline_model(depth=48, num_chunks=1, layer_partitions=None, **
                 assert "checkpoint_path" in model_kwargs.keys(), "You have to specify a file path to use checkpoint loading"
                 print(model_kwargs["checkpoint_path"])
                 assert os.path.exists(model_kwargs["checkpoint_path"]), "Checkpoint file not found"
-            load_checkpoint(model_kwargs["checkpoint_path"], model, **model_kwargs)
+            load_checkpoint(model_kwargs["checkpoint_path"], model, preprocess_fn=processing_HF_GPT, **model_kwargs)
     logger.info(f'Rank{rank}/{pipeline_rank} model size = {numel * 2 / 1e9} GB')
     return model