Librarian Bot: Add base_model information to model

This pull request aims to enrich the metadata of your model by adding [`wav2vec2-base`](https://huggingface.co/wav2vec2-base) as a `base_model` field, situated in the `YAML` block of your model's `README.md`.

How did we find this information? We performed a regular expression match on your `README.md` file to determine the connection.

**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

@@ -2,14 +2,15 @@
 language: en
 license: apache-2.0
 tags:
-  - audio-classification
-  - generated_from_trainer
+- audio-classification
+- generated_from_trainer
 metrics:
-  - accuracy
-  - f1
+- accuracy
+- f1
+base_model: wav2vec2-base
 model-index:
-  - name: wav2vec2-adult-child-cls
-    results: []
+- name: wav2vec2-adult-child-cls
+  results: []
 ---
 
 # Wav2Vec2 Adult/Child Speech Classifier