begining to make select_best_model compatible

object_attribute_classifier_cached_features/select_best_model.py

@@ -48,7 +48,7 @@ def create_batch_generator():
         constants.object_labels_json,
         constants.attribute_labels_json,
         constants.regions_json,
-        constants.genome_train_held_out_region_ids,
+        constants.genome_val_region_ids,
         constants.image_size,
         channels=3,
         resnet_feat_dim = constants.resnet_feat_dim,