set rope_scaling_factor default to auto

Author: nina-xu

config_templates/gretel/synthetics/navigator-ft.yml

@@ -33,8 +33,9 @@ models:
         # Scale the base LLM's context length by this factor
         # using RoPE scaling to handle datasets with more
         # columns, or datasets containing groups with more
-        # than a few records. You can try increasing the
-        # rope_scaling_factor (you could first try the value 2)
-        # if you hit an error for maximum tokens. It must be
-        # an integer value. The default is 1 and maximum is 6. 
-        rope_scaling_factor: 1
+        # than a few records. If set to 'auto', we will
+        # estimate a value that's enough to cover your
+        # dataset. Try increasing this value if you hit an
+        # error for maximum tokens. It must be an integer
+        # value between 1 and 6.
+        rope_scaling_factor: auto