Describe the magic number 7 in a comment

Seppo Enarvi · Seppo Enarvi · commit 908355e271f4 · 2025-08-11T16:45:40.000+03:00
diff --git a/src/lightning/pytorch/callbacks/weight_averaging.py b/src/lightning/pytorch/callbacks/weight_averaging.py
@@ -289,6 +289,8 @@ def on_save_checkpoint(
         else:
             average_model_state = self._average_model.state_dict()
             checkpoint["current_model_state"] = checkpoint["state_dict"]
+            # Truncate the "module." prefix (the first 7 characters) from the names of the variables in the
+            # AveragedModel state.
             checkpoint["state_dict"] = {
                 name[7:]: value for name, value in average_model_state.items() if name.startswith("module.")
             }

Original file line number	Diff line number	Diff line change
`@@ -289,6 +289,8 @@ def on_save_checkpoint(`
`289`	`289`	`else:`
`290`	`290`	`average_model_state = self._average_model.state_dict()`
`291`	`291`	`checkpoint["current_model_state"] = checkpoint["state_dict"]`
	`292`	`+ # Truncate the "module." prefix (the first 7 characters) from the names of the variables in the`
	`293`	`+ # AveragedModel state.`
`292`	`294`	`checkpoint["state_dict"] = {`
`293`	`295`	`name[7:]: value for name, value in average_model_state.items() if name.startswith("module.")`
`294`	`296`	`}`