Updated loading logic

AstroM3Dataset.py

@@ -83,8 +83,8 @@ class AstroM3Dataset(datasets.GeneratorBasedBuilder):
             description=_DESCRIPTION,
             features=datasets.Features(
                 {
-                    "photometry": datasets.Array2D(shape=(None, 3), dtype="float32"),
-                    "spectra": datasets.Array2D(shape=(None, 3), dtype="float32"),
+                    "photometry": datasets.Sequence(datasets.Sequence(datasets.Value("float32"), length=3)),
+                    "spectra": datasets.Sequence(datasets.Sequence(datasets.Value("float32"), length=3)),
                     "metadata": {
                         "meta_cols": {el: datasets.Value("float32") for el in _METADATA_COLS},
                         "photo_cols": {el: datasets.Value("float32") for el in _PHOTO_COLS},