Librarian Bot: Add base_model information to model

This pull request aims to enrich the metadata of your model by adding [`facebook/opt-2.7b`](https://huggingface.co/facebook/opt-2.7b) as a `base_model` field, situated in the `YAML` block of your model's `README.md`.

How did we find this information? We extracted this infromation from the `adapter_config.json` file of your model.

**Why add this?** Enhancing your model's metadata in this way:
- **Boosts Discoverability** - It becomes straightforward to trace the relationships between various models on the Hugging Face Hub.
- **Highlights Impact** - It showcases the contributions and influences different models have within the community.

For a hands-on example of how such metadata can play a pivotal role in mapping model connections, take a look at [librarian-bots/base_model_explorer](https://huggingface.co/spaces/librarian-bots/base_model_explorer).

This PR comes courtesy of [Librarian Bot](https://huggingface.co/librarian-bot). If you have any feedback, queries, or need assistance, please don't hesitate to reach out to [@davanstrien](https://huggingface.co/davanstrien).

If you want to automatically add `base_model` metadata to more of your modes you can use the [Librarian Bot](https://huggingface.co/librarian-bot) [Metadata Request Service](https://huggingface.co/spaces/librarian-bots/metadata_request_service)!

README.md

@@ -1,12 +1,13 @@
 ---
-datasets:
-- SirNeural/flan_v2
-metrics:
-- perplexity
 tags:
 - flan
 - opt
 - peft
+datasets:
+- SirNeural/flan_v2
+metrics:
+- perplexity
+base_model: facebook/opt-2.7b
 ---
 
 ## ptune-FLAN-OPT-2.7b