[fix] fix sample type non numeric

miles/utils/types.py

@@ -213,10 +213,20 @@ def reset_for_retry(self) -> None:
 
     @property
     def oldest_weight_version(self) -> int | None:
-        """Minimum weight version across all turns (generation calls) for this trajectory."""
+        """Minimum weight version across turns.
+
+        Non-numeric versions are ignored.
+        """
         if not self.weight_versions:
             return None
-        return min(int(v) for v in self.weight_versions)
+
+        versions = []
+        for version in self.weight_versions:
+            try:
+                versions.append(int(version))
+            except (TypeError, ValueError):
+                continue
+        return min(versions) if versions else None
 
     def update_from_meta_info(self, args, meta_info: dict):
         """

tests/fast/utils/test_types.py

@@ -95,3 +95,13 @@ def test_strip_negative_is_noop(self, tokenizer):
         original_tokens = list(s.tokens)
         s.strip_last_output_tokens(-1, tokenizer)
         assert s.tokens == original_tokens
+
+
+class TestOldestWeightVersion:
+    def test_ignores_non_numeric_versions(self):
+        s = Sample(weight_versions=["default", "3", "x", "10"])
+        assert s.oldest_weight_version == 3
+
+    def test_all_non_numeric_versions_return_none(self):
+        s = Sample(weight_versions=["default", "latest"])
+        assert s.oldest_weight_version is None