Update preprocessor_config.json

preprocessor_config.json

@@ -1,7 +1,7 @@
- {
-     "do_resize": true,
-     "image_mean": [0.5],
-     "image_std": [0.5],
-     "resample": 2,
-     "size": 224
- }
+{
+    "do_resize": true,
+    "image_mean": [0.485, 0.456, 0.406],
+    "image_std": [0.229, 0.224, 0.225],
+    "resample": 2,
+    "size": 224
+}