Last changes

Author: jackzhxng

exir/emit/_emitter.py

@@ -1575,7 +1575,8 @@ def _find_fqn_for_placeholder(
                     warnings.warn(
                         "Mutation on a buffer in the model is detected. ExecuTorch assumes "
                         "buffers that are mutated in the graph have a meaningless initial state, "
-                        "only the shape and dtype will be serialized.",
+                        "only the shape and dtype will be serialized, unless a pass which marks "
+                        "spec.const=True such as InitializedMutableBufferPass is run.",
                         UserWarning,
                         stacklevel=1,
                     )

exir/passes/init_mutable_pass.py

@@ -24,8 +24,14 @@ def __init__(self, patterns: List[str]) -> None:
         self.patterns = patterns
 
     def placeholder(self, name: str, arg, meta):
+        pattern_found = False
         for pattern in self.patterns:
             if pattern in name:
                 meta["et_init_buffer"] = True
+                pattern_found = True
+        if not pattern_found:
+            raise ValueError(
+                f"Could not match any of {self.patterns} to the model's placeholders."
+            )
 
         return super().placeholder(name, arg, meta)