description: st.experimental_singleton.clear clears all singleton caches.
Example
In the example below, pressing the "Clear All" button will clear all singleton caches. i.e. Clears cached singleton objects from all functions decorated with @st.experimental_singleton.
```python
import streamlit as st
from transformers import BertModel
@st.experimental_singleton
 def get_database_session(url):
     # Create a database session object that points to the URL.
     return session
@st.experimental_singleton
def get_model(model_type):
    # Create a model of the specified type.
    return BertModel.from_pretrained(model_type)
if st.button("Clear All"):
    # Clears all singleton caches:
    st.experimental_singleton.clear()
```
