Support for converting OpenX datasets from RLDS format to LeRobotDataset (#354)

Signed-off-by: youliangtan <tan_you_liang@hotmail.com>
Co-authored-by: Simon Alibert <alibert.sim@gmail.com>
Co-authored-by: youliangtan <tan_you_liang@hotmail.com>
Co-authored-by: Remi <re.cadene@gmail.com>

lerobot/common/datasets/compute_stats.py

@@ -40,6 +40,10 @@ def get_stats_einops_patterns(dataset, num_workers=0):
 
     stats_patterns = {}
     for key, feats_type in dataset.features.items():
+        # NOTE: skip language_instruction embedding in stats computation
+        if key == "language_instruction":
+            continue
+
         # sanity check that tensors are not float64
         assert batch[key].dtype != torch.float64