Fix aloha real-world datasets (#175)

tests/data/lerobot/xarm_push_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": 3,
-      "_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": ""
-}
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+oid sha256:8133fe105b6e35182c4e24d8ac092730cb8f684f6591e4f1b3a4a2adaf224c46
+size 912

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

@@ -1,13 +1,3 @@
-{
-  "_data_files": [
-    {
-      "filename": "data-00000-of-00001.arrow"
-    }
-  ],
-  "_fingerprint": "9f3d8cbb0b2e74a2",
-  "_format_columns": null,
-  "_format_kwargs": {},
-  "_format_type": null,
-  "_output_all_columns": false,
-  "_split": null
-}
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+oid sha256:71f84c95ef32e00060d1658cb601be1bc640a85b9e7200a3af481ba93c145de0
+size 247