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README.md

@@ -23,13 +23,15 @@ Create and activate a conda env, then install the dependencies:
 conda create -n robotdata python=3.10 -y
 conda activate robotdata
 pip install h5py numpy opencv-python datasets
-pip install lerobot
+pip install "lerobot @ git+https://github.com/huggingface/lerobot@0cf864870cf29f4738d3ade893e6fd13fbd7cdb5"
 ```
 
+**Why this specific commit is required for Pi-0.5 / OpenPI:**
+LeRobot 0.4.3+ writes datasets in the v3.0 format, which **OpenPI (Pi-0 / Pi-0.5) cannot read**. OpenPI requires the v2.1 format, which is produced by LeRobot commit `0cf864870cf29f4738d3ade893e6fd13fbd7cdb5` (reports itself as version `0.1.0`). Do **not** upgrade LeRobot unless you also upgrade the downstream training code.
+
 Notes:
-- Python 3.10 is the most broadly compatible with LeRobot; 3.11 also works.
-- `lerobot` pulls in `torch`, `huggingface_hub`, and other heavy deps. If the resolver is slow, install `lerobot` first and add the smaller packages after.
-- If you need a specific CUDA build of `torch`, install it before `lerobot` using the selector on pytorch.org.
+- Python 3.10 is the most broadly compatible with this LeRobot commit; 3.11 also works.
+- `lerobot` pulls in `torch`, `huggingface_hub`, and other heavy deps. If you need a specific CUDA build of `torch`, install it before `lerobot` using the selector on pytorch.org.
 
 Quick sanity check: