diff --git a/src/aiia/pretrain/pretrainer.py b/src/aiia/pretrain/pretrainer.py
index 42ba4b8..93df9dd 100644
--- a/src/aiia/pretrain/pretrainer.py
+++ b/src/aiia/pretrain/pretrainer.py
@@ -3,7 +3,7 @@ from torch import nn
 import csv
 import pandas as pd
 from tqdm import tqdm
-from ..model.Model import AIIA
+from transformers import PreTrainedModel
 from ..model.config import AIIAConfig
 from ..data.DataLoader import AIIADataLoader
 import os
@@ -21,12 +21,12 @@ class ProjectionHead(nn.Module):
             return self.conv_rotate(x).mean(dim=(2, 3))  # Global average pooling for rotation task
 
 class Pretrainer:
-    def __init__(self, model: AIIA, learning_rate=1e-4, config: AIIAConfig=None):
+    def __init__(self, model: PreTrainedModel, learning_rate=1e-4, config: AIIAConfig=None):
         """
         Initialize the pretrainer with a model.
         
         Args:
-            model (AIIA): The model instance to pretrain
+            model (PreTrainedModel): The model instance to pretrain
             learning_rate (float): Learning rate for optimization
             config (dict): Model configuration containing hidden_size
         """
@@ -186,11 +186,11 @@ class Pretrainer:
             
             if val_loss < best_val_loss:
                 best_val_loss = val_loss
-                self.model.save(output_path)
-                print("Best model saved!")
+                self.model.save_pretrained(output_path)
+                print("Best model save_pretrainedd!")
 
         losses_path = os.path.join(os.path.dirname(output_path), 'losses.csv')
-        self.save_losses(losses_path)
+        self.save_pretrained_losses(losses_path)
 
     def _validate(self, val_loader, criterion_denoise, criterion_rotate):
         """Perform validation and return average validation loss."""
@@ -216,8 +216,8 @@ class Pretrainer:
         return avg_val_loss
 
 
-    def save_losses(self, csv_file):
-        """Save training and validation losses to a CSV file."""
+    def save_pretrained_losses(self, csv_file):
+        """save_pretrained training and validation losses to a CSV file."""
         data = list(zip(
             range(1, len(self.train_losses) + 1),
             self.train_losses,