[Minor] Add comment on skipping rope caches (#2004)

Author: WoosukKwon

vllm/model_executor/models/llama.py

@@ -322,9 +322,10 @@ def load_weights(self,
                 model_name_or_path, cache_dir, load_format, revision):
             if "rotary_emb.inv_freq" in name:
                 continue
-            if "rotary_emb.cos_cached" in name:
-                continue
-            if "rotary_emb.sin_cached" in name:
+            if ("rotary_emb.cos_cached" in name
+                    or "rotary_emb.sin_cached" in name):
+                # Models trained using ColossalAI may include these tensors in
+                # the checkpoint. Skip them.
                 continue
             for (param_name, weight_name, shard_id) in stacked_params_mapping:
                 if weight_name not in name: