Fix model parameters

app.py

@@ -100,15 +100,16 @@ with col2:
 with col3:
     # set SAHI parameters
     st.markdown('##### Set model parameters')
-    slice_size_percentage = st.slider(
-        label = 'Slice Size %', 
-        min_value=0.25,
-        max_value=1.0, 
-        value=0.5, 
-        step=0.25
+    slice_size_percentage = st.select_slider(
+        'Image Slicing Ratio', 
+        options = [
+            '25 %',
+            '50 %',
+            '75 %',            
+        ],
     )
     overlap_ratio = st.slider(
-        label = 'Overlap Ratio', 
+        label = 'Slicing Overlap Ratio', 
         min_value=0.0, 
         max_value=0.5, 
         value=0.1, 
@@ -133,7 +134,7 @@ if submit:
     with st.spinner(text="Downloading model weights ... "):
         detection_model = get_model(postprocess_match_threshold)
         
-    slice_size = (slice_size_percentage/0.25) * 1240
+    slice_size = int((float(slice_size_percentage)/0.25) * 1240)
     image_size = 4960
 
     with st.spinner(text="Performing prediction ... "):