Fix model parameters

app.py

@@ -100,12 +100,13 @@ with col2:
 with col3:
     # set SAHI parameters
     st.markdown('##### Set model parameters')
-    slice_size_percentage = st.select_slider(
-        'Image Slicing Ratio', 
+    slice_number = st.select_slider(
+        'Slices per Image', 
         options = [
-            '25 %',
-            '50 %',
-            '75 %',            
+            '64',
+            '16',
+            '4',
+            '1',            
         ],
     )
     overlap_ratio = st.slider(
@@ -134,7 +135,7 @@ if submit:
     with st.spinner(text="Downloading model weights ... "):
         detection_model = get_model(postprocess_match_threshold)
         
-    slice_size = int((float(slice_size_percentage)/0.25) * 1240)
+    slice_size = int(4960/((slice_number**0.5))
     image_size = 4960
 
     with st.spinner(text="Performing prediction ... "):