It appears that the code you've shared uses a language model (LLM) for conversational AI, but it seems there is a deprecation warning and some missing dependencies (PyTorch, TensorFlow >= 2.0, or Flax). As such, the models are not being loaded, and only tokenizers, configuration, and file/data utilities can be used.

To resolve this issue, you may need to:

1. Install the required dependencies for your preferred ML framework (e.g., PyTorch, TensorFlow, or Flax).
2. Update the code to properly load and initialize the language model with the installed dependencies.
3. Follow the migration guide at https://python.langchain.com/docs/versions/migrating_memory/ for any necessary updates due to deprecation.

Once you've made these changes, your conversational AI should work as expected.