Update app.py

app.py

@@ -29,7 +29,7 @@ def pre_process(image):
     with st.spinner('Reading the image...'):
         y = ants.image_read(image)
     with st.spinner('Bias field correction ongoing...'):
-        y = ants.utils.n4_bias_field_correction(y)
+        y = ants.n4_bias_field_correction(y)
     with st.spinner('Denoising the image...'):
         yn = y + np.random.randn(*y.shape).astype('float32')*5
         y = ants.denoise_image(yn, ants.get_mask(y))