Update app.py

app.py

@@ -18,7 +18,7 @@ from docx.enum.text import WD_PARAGRAPH_ALIGNMENT
 import os
 import json
 from sklearn.linear_model import Ridge, Lasso, ElasticNet
-from sklearn.model_selection import cross_val_score
+from sklearn.model_selection import cross_val_score, KFold  # ¡CORRECCIÓN AQUÍ!
 from sklearn.decomposition import PCA
 from sklearn.preprocessing import StandardScaler
 from skopt import gp_minimize