[dynamo] Improve error message for cond aliasing (pytorch#156963)

jansel · pytorchmergebot · commit 51853b358e69 · 2025-06-27T05:31:46.000Z
See pytorch#156724 Pull Request resolved: pytorch#156963 Approved by: https://github.com/zou3519, https://github.com/williamwen42
diff --git a/torch/_dynamo/graph_break_registry.json b/torch/_dynamo/graph_break_registry.json
@@ -391,6 +391,7 @@
       "Context": "context",
       "Explanation": "Higher order ops do not support aliasing. Found in {source_target.name()}",
       "Hints": [
+        "Replace `return input` with `return input.clone()` to avoid aliasing.",
         "Consider using the debug context to change user code to avoid aliasing.",
         "Please open an issue."
       ]
diff --git a/torch/_dynamo/variables/higher_order_ops.py b/torch/_dynamo/variables/higher_order_ops.py
@@ -838,6 +838,7 @@ def move_lifted_freevars_phs_to_end(
                             context=context,
                             explanation=f"Higher order ops do not support aliasing. Found in {source_target.name()}",
                             hints=[
+                                "Replace `return input` with `return input.clone()` to avoid aliasing.",
                                 "Consider using the debug context to change user code to avoid aliasing.",
                                 "Please open an issue.",
                             ],

Original file line number	Diff line number	Diff line change
`@@ -391,6 +391,7 @@`
`391`	`391`	`"Context": "context",`
`392`	`392`	`"Explanation": "Higher order ops do not support aliasing. Found in {source_target.name()}",`
`393`	`393`	`"Hints": [`
	`394`	+ "Replace `return input` with `return input.clone()` to avoid aliasing.",
`394`	`395`	`"Consider using the debug context to change user code to avoid aliasing.",`
`395`	`396`	`"Please open an issue."`
`396`	`397`	`]`