streamlit-session-memo

A decorator for session-specific caching on Streamlit.

from streamlit_session_memo import st_session_memo


@st_session_memo
def load_big_model():
    ...
    return model


model = load_big_model()

This is a simple wrapper around st.session_state that caches the return value of the decorated function to the session state and returns the cached value if the function is called again with the same arguments. We have been doing this manually with code like the following, but this decorator makes it simpler.

# Boilerplate code for session-specific caching.
cache_key = f"{arg_1}_{arg_2}_{arg_3}"
if cache_key in st.session_state:
    model = st.session_state[cache_key]
else:
    result = load_expensive_model(arg_1, arg_2, arg_3)
    st.session_state[cache_key] = result
    model = result

Arguments are hashed the way st.cache_data and st.cache_resource hash theirs, by delegating to Streamlit's own key builder: values such as dicts and DataFrames are keyed by content, passing an argument positionally or by keyword gives the same key, a parameter whose name starts with an underscore is left out of the key, and an argument of a type Streamlit cannot hash raises UnhashableParamError. That exception is Streamlit's own, so its message suggests @st.cache_resource; the underscore it advises works the same way here.

Note that, this decorator is a lightweight wrapper around st.session_state that acts like the code snippet above, and does not provide any additional features such as mutation guards that st.cache_data provides.

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