Added os getenv for key

app.py

@@ -36,7 +36,7 @@ class MultiHeadBERT(nn.Module):
         super(MultiHeadBERT, self).__init__()
         
         # Shared BERT backbone
-        self.bert = BertModel.from_pretrained('bert-base-uncased',token=os.get_env('HF_TOKEN'))
+        self.bert = BertModel.from_pretrained('bert-base-uncased',token=os.getenv('HF_TOKEN'))
         hidden_size = self.bert.config.hidden_size  # 768
         
         # Task-specific classification heads