typo on transformer fixed

app.py

@@ -3,7 +3,7 @@ import torch
 import torch.nn.functional as F
 import tiktoken
 from huggingface_hub import hf_hub_download
-from transformerg import GPT, GPTConfig  # Import your model class
+from transformer import GPT, GPTConfig  # Import your model class
 
 # Load the model from Hugging Face Hub
 device = 'cuda' if torch.cuda.is_available() else 'cpu'