Try to show utils documentation

docs/src/dev-docs/utils-api.rst

@@ -5,3 +5,9 @@ This is the API for the ``utils`` module of ``metatensor-models``.
 
 .. automodule:: metatensor_models.utils.data
     :members:
+
+.. automodule:: metatensor_models.utils.data.dataset
+    :members:
+
+.. automodule:: metatensor_models.utils.data.readers
+    :members:

src/metatensor_models/utils/data/dataset.py

@@ -10,8 +10,11 @@ class Dataset(torch.utils.data.Dataset):
     def __init__(
         self, structures: List[rascaline.torch.System], targets: Dict[str, TensorMap]
     ):
-        """Creates a dataset from a list of `rascaline.torch.System`s and
-        a list of dictionaries of `TensorMap`s."""
+        """
+        Creates a dataset from a list of `rascaline.torch.System` objects
+        and a dictionary of targets where the keys are strings and the
+        values are `TensorMap` objects.
+        """
 
         for tensor_map in targets.values():
             n_structures = (
@@ -35,8 +38,10 @@ def __len__(self):
     def __getitem__(self, index):
         """
         Generates one sample of data.
+
         Args:
             index: The index of the item in the dataset.
+        
         Returns:
             A tuple containing the structure and targets for the given index.
         """
@@ -59,9 +64,11 @@ def __getitem__(self, index):
 def collate_fn(batch):
     """
     Creates a batch from a list of samples.
+
     Args:
         batch: A list of samples, where each sample is a tuple containing a
             structure and targets.
+    
     Returns:
         A tuple containing the structures and targets for the batch.
     """