Update README.md

Added Optical flow rendered

README.md

@@ -13,13 +13,14 @@ Pre-computed features from the [How2Sign](https://huggingface.co/datasets/aipiec
 
 Each modality is split by `train` / `test` / `val` and packed into ~3 GB tar shards.
 
-| Modality                            | Content                              | Approx size |
-|-------------------------------------|--------------------------------------|-------------|
-| `depth_rendered`                    | rendered depth-map JPGs per clip     | ~39 GB      |
-| `poses_rendered`                    | rendered pose-skeleton JPGs per clip | ~43 GB      |
-| `poses`                             | raw pose `.npy` per clip             | ~18 GB      |
-| `optical_flow`                      | optical flow `.npy` per clip         | ~3 GB       |
-| `processed_english_translations`    | translations csv per split           | ~6 MB       |
+| Modality                            | Content                                          | Approx size |
+|-------------------------------------|--------------------------------------------------|-------------|
+| `depth_rendered`                    | rendered depth-map JPGs per clip                 | ~39 GB      |
+| `poses_rendered`                    | rendered pose-skeleton JPGs per clip             | ~43 GB      |
+| `poses`                             | raw pose `.npy` per clip                         | ~18 GB      |
+| `optical_flow`                      | optical flow `.npy` per clip                     | ~3 GB       |
+| `optical_flow_rendered`             | rendered optical_flow JPGs per clip with stride 2| ~11 GB      |
+| `processed_english_translations`    | translations csv per split                       | ~6 MB       |
 
 Inside each tar, paths are relative to the split, e.g.: