docs(naming): add missing docstrings to filename utility functions

src/evaluate/naming.py

@@ -44,12 +44,52 @@ def snakecase_to_camelcase(name):
 
 
 def filename_prefix_for_name(name):
+    """Return the snake_case filename prefix for a given dataset name.
+
+    Args:
+        name (`str`): Dataset name (must not contain path separators).
+
+    Returns:
+        `str`: The snake_case version of `name`, used as the base prefix for data files.
+
+    Raises:
+        `ValueError`: If `name` looks like a file path rather than a plain dataset name.
+
+    Example:
+        ```py
+        >>> filename_prefix_for_name("MyDataset")
+        'my_dataset'
+        ```
+    """
     if os.path.basename(name) != name:
         raise ValueError(f"Should be a dataset name, not a path: {name}")
     return camelcase_to_snakecase(name)
 
 
 def filename_prefix_for_split(name, split):
+    """Return the filename prefix for a specific dataset split.
+
+    Combines the snake_case dataset name with the split name, following
+    the pattern ``<snake_case_name>-<split>``.
+
+    Args:
+        name (`str`): Dataset name (must not contain path separators).
+        split (`str`): Split identifier, e.g. ``"train"``, ``"test"``, or
+            a dotted sub-split such as ``"train.clean"``.
+
+    Returns:
+        `str`: The filename prefix in the form ``<name_prefix>-<split>``.
+
+    Raises:
+        `ValueError`: If `name` looks like a path, or `split` does not match
+            the expected pattern ``^\\w+(\\.\\w+)*$``.
+
+    Example:
+        ```py
+        >>> filename_prefix_for_split("MyDataset", "train")
+        'my_dataset-train'
+        ```
+    """
     if os.path.basename(name) != name:
         raise ValueError(f"Should be a dataset name, not a path: {name}")
     if not re.match(_split_re, split):
@@ -58,6 +98,25 @@ def filename_prefix_for_split(name, split):
 
 
 def filepattern_for_dataset_split(dataset_name, split, data_dir, filetype_suffix=None):
+    """Return a glob pattern matching all shard files for a dataset split.
+
+    Args:
+        dataset_name (`str`): Dataset name (must not contain path separators).
+        split (`str`): Split identifier, e.g. ``"train"`` or ``"validation"``.
+        data_dir (`str`): Directory where the dataset files are stored.
+        filetype_suffix (`str`, *optional*): File extension to append before the
+            glob wildcard, e.g. ``"parquet"`` → ``"my_dataset-train.parquet*"``.
+            When ``None`` the pattern has no extension suffix.
+
+    Returns:
+        `str`: A glob pattern of the form ``<data_dir>/<prefix>[.<suffix>]*``.
+
+    Example:
+        ```py
+        >>> filepattern_for_dataset_split("MyDataset", "train", "/data", "parquet")
+        '/data/my_dataset-train.parquet*'
+        ```
+    """
     prefix = filename_prefix_for_split(dataset_name, split)
     if filetype_suffix:
         prefix += f".{filetype_suffix}"
@@ -66,13 +125,52 @@ def filepattern_for_dataset_split(dataset_name, split, data_dir, filetype_suffix
 
 
 def filename_for_dataset_split(dataset_name, split, filetype_suffix=None):
+    """Return the filename (without directory) for a dataset split.
+
+    Args:
+        dataset_name (`str`): Dataset name (must not contain path separators).
+        split (`str`): Split identifier, e.g. ``"train"`` or ``"test"``.
+        filetype_suffix (`str`, *optional*): File extension to append, e.g.
+            ``"arrow"`` → ``"my_dataset-train.arrow"``. When ``None`` no
+            extension is added.
+
+    Returns:
+        `str`: The filename string, e.g. ``"my_dataset-train.arrow"``.
+
+    Example:
+        ```py
+        >>> filename_for_dataset_split("MyDataset", "train", "arrow")
+        'my_dataset-train.arrow'
+        ```
+    """
     prefix = filename_prefix_for_split(dataset_name, split)
     if filetype_suffix:
         prefix += f".{filetype_suffix}"
     return prefix
 
 
 def filepath_for_dataset_split(dataset_name, split, data_dir, filetype_suffix=None):
+    """Return the full file path for a dataset split file.
+
+    Combines `data_dir` and the result of :func:`filename_for_dataset_split`
+    to produce an absolute-or-relative path suitable for reading or writing.
+
+    Args:
+        dataset_name (`str`): Dataset name (must not contain path separators).
+        split (`str`): Split identifier, e.g. ``"train"`` or ``"validation"``.
+        data_dir (`str`): Directory where the dataset files are stored.
+        filetype_suffix (`str`, *optional*): File extension without the leading
+            dot, e.g. ``"arrow"``. When ``None`` no extension is added.
+
+    Returns:
+        `str`: Full path of the form ``<data_dir>/<filename>``.
+
+    Example:
+        ```py
+        >>> filepath_for_dataset_split("MyDataset", "train", "/data", "arrow")
+        '/data/my_dataset-train.arrow'
+        ```
+    """
     filename = filename_for_dataset_split(
         dataset_name=dataset_name,
         split=split,