changed resolution to reduce image loading time

SPIDER.py

@@ -46,6 +46,8 @@ def standardize_3D_image(
         image = np.transpose(image, axes=[1, 2, 0])
     # Resize image
     image = skimage.transform.resize(image, resize_shape)
+    # Rescale to UInt8 type
+    image = skimage.img_as_ubyte(image)
     return image
 
 
@@ -163,8 +165,8 @@ class SPIDER(datasets.GeneratorBasedBuilder):
             "scan_type": datasets.Value("string"),
             "image_path": datasets.Value("string"),
             "mask_path": datasets.Value("string"),
-            "image_array": datasets.Array3D(shape=image_size, dtype='float64'),
-            "mask_array": datasets.Array3D(shape=image_size, dtype='float64'),
+            "image_array": datasets.Array3D(shape=image_size, dtype='uint8'),
+            "mask_array": datasets.Array3D(shape=image_size, dtype='uint8'),
             "metadata": {
                 "num_vertebrae": datasets.Value(dtype="string"), #TODO: more specific types
                 "num_discs": datasets.Value(dtype="string"),