memory fix double variables, fix var name

app.py

@@ -30,6 +30,7 @@ dataset = load_dataset(
 
 # Convert the train split to a pandas DataFrame
 train_df = dataset.to_pandas()
+del dataset
 
 
 def create_phase_diagram(
@@ -42,7 +43,7 @@ def create_phase_diagram(
     entries = [
         ComputedStructureEntry(
             Structure(
-                [x.tolist() for x in df.iloc[0]["lattice_vectors"].tolist()],
+                [x.tolist() for x in train_df.iloc[0]["lattice_vectors"].tolist()],
                 row["species_at_sites"],
                 row["cartesian_site_positions"],
                 coords_are_cartesian=True,