py2 fix

pytorch_transformers/data/metrics/__init__.py

@@ -24,7 +24,7 @@ try:
     from scipy.stats import pearsonr, spearmanr
     from sklearn.metrics import matthews_corrcoef, f1_score
     _has_sklearn = True
-except e:
+except (AttributeError, ImportError) as e:
     logger.warning("To use data.metrics please install scikit-learn. See https://scikit-learn.org/stable/index.html")
     _has_sklearn = False