Now lets see some examples on how to update those metadata.  
Let's start with a first example:  
```python
>>> from huggingface_hub import metadata_update
>>> metadata_update("username/my-cool-model", {"pipeline_tag": "image-classification"})
```  
With these two lines of code you will update the metadata to set a new `pipeline_tag`.  
By default, you cannot update a key that is already existing on the card. If you want to do so, you must pass
`overwrite=True` explicitly:  
```python