add hf token from env variable

app.py

@@ -9,8 +9,10 @@ from pymatgen.core.composition import Composition
 from pymatgen.entries.computed_entries import (ComputedStructureEntry,
                                                GibbsComputedStructureEntry)
 
+HF_TOKEN = os.environ.get("HF_TOKEN")
+
 # Load only the train split of the dataset
-dataset = load_dataset("LeMaterial/leDataset", split="train")
+dataset = load_dataset("LeMaterial/leDataset", token=HF_TOKEN, split="train")
 
 # Convert the train split to a pandas DataFrame
 train_df = dataset.to_pandas()