Fix aloha real-world datasets (#175)

tests/data/lerobot/xarm_lift_medium/meta_data/info.json

@@ -1,4 +1,3 @@
-{
-    "fps": 15,
-    "video": 1
-}
+version https://git-lfs.github.com/spec/v1
+oid sha256:0c6e3c50bb65c5e47ac24bc32e53ab533c78b82c6debab45da6ecea4ce067e37
+size 33

tests/data/lerobot/xarm_lift_medium/train/dataset_info.json

@@ -1,51 +1,3 @@
-{
-  "citation": "",
-  "description": "",
-  "features": {
-    "observation.image": {
-      "_type": "VideoFrame"
-    },
-    "observation.state": {
-      "feature": {
-        "dtype": "float32",
-        "_type": "Value"
-      },
-      "length": 4,
-      "_type": "Sequence"
-    },
-    "action": {
-      "feature": {
-        "dtype": "float32",
-        "_type": "Value"
-      },
-      "length": 4,
-      "_type": "Sequence"
-    },
-    "episode_index": {
-      "dtype": "int64",
-      "_type": "Value"
-    },
-    "frame_index": {
-      "dtype": "int64",
-      "_type": "Value"
-    },
-    "timestamp": {
-      "dtype": "float32",
-      "_type": "Value"
-    },
-    "next.reward": {
-      "dtype": "float32",
-      "_type": "Value"
-    },
-    "next.done": {
-      "dtype": "bool",
-      "_type": "Value"
-    },
-    "index": {
-      "dtype": "int64",
-      "_type": "Value"
-    }
-  },
-  "homepage": "",
-  "license": ""
-}
+version https://git-lfs.github.com/spec/v1
+oid sha256:a219f973d6535f40737265fd15d81944aabf8eb7527384d28c507926bfa89f25
+size 912

tests/data/lerobot/xarm_lift_medium/train/state.json

@@ -1,13 +1,3 @@
-{
-  "_data_files": [
-    {
-      "filename": "data-00000-of-00001.arrow"
-    }
-  ],
-  "_fingerprint": "720072274a55db4d",
-  "_format_columns": null,
-  "_format_kwargs": {},
-  "_format_type": null,
-  "_output_all_columns": false,
-  "_split": null
-}
+version https://git-lfs.github.com/spec/v1
+oid sha256:814a0694efe765a72beb63e3d21af715835e085cbbda768955c5c204502a7607
+size 247