Fix to show class score in display_differences()

And a couple other minor fixes.

mrcnn/utils.py

@@ -437,7 +437,7 @@ def resize_image(image, min_dim=None, max_dim=None, min_scale=None, mode="square
     if min_dim:
         # Scale up but not down
         scale = max(1, min_dim / min(h, w))
-    if scale < min_scale:
+    if min_scale and scale < min_scale:
         scale = min_scale
 
     # Does it exceed max dim?

mrcnn/visualize.py

@@ -191,7 +191,7 @@ def display_differences(image,
     masks = np.concatenate([gt_mask, pred_mask], axis=-1)
     # Captions per instance show score/IoU
     captions = ["" for m in gt_match] + ["{:.2f} / {:.2f}".format(
-        scores[i],
+        pred_score[i],
         (overlaps[i, int(pred_match[i])]
             if pred_match[i] > -1 else overlaps[i].max()))
             for i in range(len(pred_match))]

samples/nucleus/nucleus.py

@@ -100,9 +100,7 @@
 ############################################################
 
 class NucleusConfig(Config):
-    """Configuration for training on the toy  dataset.
-    Derives from the base Config class and overrides some values.
-    """
+    """Configuration for training on the nucleus segmentation dataset."""
     # Give the configuration a recognizable name
     NAME = "nucleus"