lerobot/tests/data/xarm_lift_medium/replay_buffer/meta.json

{"action": {"device": "cpu", "shape": [50, 4], "dtype": "torch.float32"}, "episode": {"device": "cpu", "shape": [50], "dtype": "torch.int32"}, "frame_id": {"device": "cpu", "shape": [50], "dtype": "torch.int64"}, "shape": [50], "device": "cpu", "_type": "<class 'tensordict._td.TensorDict'>"}