ENH add a friendly warnings before deleting the file

Author: arjoly

sklearn/metrics/metrics.py

@@ -0,0 +1,36 @@
+import warnings
+warnings.warn("sklearn.metrics.metrics is deprecated and will be remove in "
+             "0.18. Please import from sklearn.metrics",
+             DeprecationWarning)
+
+
+from .ranking import auc
+from .ranking import average_precision_score
+from .ranking import label_ranking_average_precision_score
+from .ranking import log_loss
+from .ranking import precision_recall_curve
+from .ranking import roc_auc_score
+from .ranking import roc_curve
+from .ranking import hinge_loss
+
+from .classification import accuracy_score
+from .classification import classification_report
+from .classification import confusion_matrix
+from .classification import f1_score
+from .classification import fbeta_score
+from .classification import hamming_loss
+from .classification import jaccard_similarity_score
+from .classification import matthews_corrcoef
+from .classification import precision_recall_fscore_support
+from .classification import precision_score
+from .classification import recall_score
+from .classification import zero_one_loss
+
+from .regression import explained_variance_score
+from .regression import mean_absolute_error
+from .regression import mean_squared_error
+from .regression import r2_score
+
+# Deprecated in 0.16
+from .ranking import auc_score
+