Fix another typo on radio button....

app.py

@@ -13,7 +13,7 @@ st.latex(r'''h(\boldsymbol x, \boldsymbol w)= \sum_{k=1}^{K}\boldsymbol w_{k} \p
 # Sidebar inputs
 number_of_observations = st.sidebar.slider('Number of observations', min_value=50, max_value=150, value=50)
 noise_standard_deviation = st.sidebar.slider('Standard deviation of the noise', min_value = 0.0, max_value=2.0, value=0.25)
-cost_function = st.sidebar.slider("What cost function you want to use for the fitting?", options=('RMSE-Loss', 'Huber-Loss'))
+cost_function = st.sidebar.radio('What cost function you want to use for the fitting?', options=('RMSE-Loss', 'Huber-Loss'))
 
 np.random.seed(2)