Update nt3_default_model.txt

Change default for checkpoint save from each epoch to 0, users can turn this on by setting some value. This causes a large amount of stuff in save folder otherwise.

Author: rajeeja

Pilot1/NT3/nt3_default_model.txt

@@ -29,5 +29,5 @@ noise_gaussian = False
 std_dev = 0.5
 timeout = 3600
 ckpt_restart_mode = 'off'
-ckpt_save_interval = 1
+ckpt_save_interval = 0
 ckpt_checksum = True