restore unrelated files

Author: wwwjn

torchtitan/experiments/llama4/train_configs/debug_model.toml

@@ -27,7 +27,7 @@ tokenizer_path = "./tests/assets/test_tiktoken.model"
 
 [optimizer]
 # TODO: AdamW has numerical issues when TP is used, need to fix it
-name = "Adam"
+name = "AdamW"
 lr = 4e-3
 eps = 1e-15