Clarify error message by mentioning "spawn" (#19142)

carmocca · web-flow · commit d8b6bbdeac64 · 2023-12-14T01:39:43.000+01:00
diff --git a/src/lightning/fabric/fabric.py b/src/lightning/fabric/fabric.py
@@ -828,8 +828,8 @@ def launch(self, function: Callable[["Fabric"], Any] = _do_nothing, *args: Any,
                 )
         elif isinstance(self.strategy.launcher, (_MultiProcessingLauncher, _XLALauncher)):
             raise TypeError(
-                f"To use the `{type(self.strategy).__name__}` strategy, `.launch()` needs to be called with a function"
-                " that contains the code to launch in processes."
+                f"To spawn processes with the `{type(self.strategy).__name__}` strategy, `.launch()` needs to be called"
+                " with a function that contains the code to launch in processes."
             )
         return self._wrap_and_launch(function, self, *args, **kwargs)
 

Original file line number	Diff line number	Diff line change
`@@ -828,8 +828,8 @@ def launch(self, function: Callable[["Fabric"], Any] = _do_nothing, *args: Any,`
`828`	`828`	`)`
`829`	`829`	`elif isinstance(self.strategy.launcher, (_MultiProcessingLauncher, _XLALauncher)):`
`830`	`830`	`raise TypeError(`
`831`		- f"To use the `{type(self.strategy).__name__}` strategy, `.launch()` needs to be called with a function"
`832`		`- " that contains the code to launch in processes."`
	`831`	+ f"To spawn processes with the `{type(self.strategy).__name__}` strategy, `.launch()` needs to be called"
	`832`	`+ " with a function that contains the code to launch in processes."`
`833`	`833`	`)`
`834`	`834`	`return self._wrap_and_launch(function, self, args, *kwargs)`
`835`	`835`