Update deepmd/pt/train/training.py

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
Signed-off-by: Chun Cai <amoycaic@gmail.com>

Author: caic99

deepmd/pt/train/training.py

@@ -157,6 +157,15 @@ def get_opt_param(params):
             return opt_type, opt_param
 
         def cycle_iterator(iterable: Iterable):
+            """
+            Produces an infinite iterator by repeatedly cycling through the given iterable.
+            
+            Args:
+                iterable (Iterable): The iterable to cycle through.
+            
+            Yields:
+                Any: The next item from the iterable, cycling back to the beginning when the end is reached.
+            """
             while True:
                 yield from iterable