[ao] Pin torchao to 0.4

Differential Revision: D61549149

Pull Request resolved: #4793

Author: larryliu0820

examples/models/llama2/install_requirements.sh

@@ -8,7 +8,7 @@
 # Install snakeviz for cProfile flamegraph
 # Install sentencepiece for llama tokenizer
 pip install snakeviz sentencepiece
-pip install torchao==0.1
+pip install torchao==0.4
 
 # Install lm-eval for Model Evaluation with lm-evalution-harness
 # Install tiktoken for tokenizer