correct dtype is u8

src/utils.rs

@@ -317,7 +317,7 @@ pub fn preprocess(image: &Tensor, square_size: i64) -> Tensor {
     let (_, height, width) = image.size3().unwrap();
     let (uw, uh) = square64(square_size, width, height);
     let scaled_image = if height == uh && width == uw {
-        let out = Tensor::ones(image.size(), (Kind::Int, Device::Cpu));
+        let out = Tensor::ones(image.size(), (Kind::Uint8, Device::Cpu));
         image.clone(&out)
     } else {
         tch::vision::image::resize(&image, uw, uh).expect("can't resize image")
@@ -355,10 +355,10 @@ mod test {
 
     #[test]
     fn test_preprocess() {
-        let image = Tensor::from_slice(&[
+        let image_data: [u8; 24] = [
             1, 2, 3, 4, 5, 6, 7, 8, 11, 12, 13, 14, 15, 16, 17, 18, 21, 22, 23, 24, 25, 26, 27, 28,
-        ])
-        .reshape([3, 2, 4]);
+        ];
+        let image = Tensor::from_slice(&image_data).reshape([3, 2, 4]);
         let bg = preprocess(&image, 4);
         let expect_bg = Tensor::from_slice(&[
             114, 114, 114, 114, 1, 2, 3, 4, 5, 6, 7, 8, 114, 114, 114, 114, 114, 114, 114, 114, 11,