Allow dashes in model name.

Print a message when re-starting from saved epoch

mrcnn/model.py

@@ -2222,7 +2222,7 @@ class MaskRCNN():
             # Continue from we left of. Get epoch and date from the file name
             # A sample model path might look like:
             # /path/to/logs/coco20171029T2315/mask_rcnn_coco_0001.h5
-            regex = r".*/\w+(\d{4})(\d{2})(\d{2})T(\d{2})(\d{2})/mask\_rcnn\_\w+(\d{4})\.h5"
+            regex = r".*/[\w-]+(\d{4})(\d{2})(\d{2})T(\d{2})(\d{2})/mask\_rcnn\_[\w-]+(\d{4})\.h5"
             m = re.match(regex, model_path)
             if m:
                 now = datetime.datetime(int(m.group(1)), int(m.group(2)), int(m.group(3)),
@@ -2230,6 +2230,7 @@ class MaskRCNN():
                 # Epoch number in file is 1-based, and in Keras code it's 0-based.
                 # So, adjust for that then increment by one to start from the next epoch
                 self.epoch = int(m.group(6)) - 1 + 1
+                print('Re-starting from epoch %d' % self.epoch)
 
         # Directory for training logs
         self.log_dir = os.path.join(self.model_dir, "{}{:%Y%m%dT%H%M}".format(