Fixed formatting of spaces docs (#174)

docs/api/spaces/utils.md

@@ -5,8 +5,8 @@ title: Utils
 # Spaces Utils
 
 ```{eval-rst}
-.. autofunction:: gymnasium.spaces.utils.flatdim
 .. autofunction:: gymnasium.spaces.utils.flatten_space
 .. autofunction:: gymnasium.spaces.utils.flatten
+.. autofunction:: gymnasium.spaces.utils.flatdim
 .. autofunction:: gymnasium.spaces.utils.unflatten
 ``` 

gymnasium/spaces/dict.py

@@ -46,8 +46,8 @@ class Dict(Space[typing.Dict[str, Any]], typing.Mapping[str, Space[Any]]):
 
     It can be convenient to use :class:`Dict` spaces if you want to make complex observations or actions more human-readable.
     Usually, it will not be possible to use elements of this space directly in learning code. However, you can easily
-    convert `Dict` observations to flat arrays by using a :class:`gym.wrappers.FlattenObservation` wrapper. Similar wrappers can be
+    convert `Dict` observations to flat arrays by using a :class:`gymnasium.wrappers.FlattenObservation` wrapper.
-    implemented to deal with :class:`Dict` actions.
+    Similar wrappers can be implemented to deal with :class:`Dict` actions.
     """
 
     def __init__(
@@ -121,9 +121,10 @@ class Dict(Space[typing.Dict[str, Any]], typing.Mapping[str, Space[Any]]):
         """Seed the PRNG of this space and all subspaces.
 
         Depending on the type of seed, the subspaces will be seeded differently
-        * None - All the subspaces will use a random initial seed
+
-        * Int - The integer is used to seed the `Dict` space that is used to generate seed values for each of the subspaces. Warning, this does not guarantee unique seeds for all of the subspaces.
+        * ``None`` - All the subspaces will use a random initial seed
-        * Dict - Using all the keys in the seed dictionary, the values are used to seed the subspaces. This allows the seeding of multiple composite subspaces (`Dict["space": Dict[...], ...]` with `{"space": {...}, ...}`).
+        * ``Int`` - The integer is used to seed the :class:`Dict` space that is used to generate seed values for each of the subspaces. Warning, this does not guarantee unique seeds for all of the subspaces.
+        * ``Dict`` - Using all the keys in the seed dictionary, the values are used to seed the subspaces. This allows the seeding of multiple composite subspaces (``Dict["space": Dict[...], ...]`` with ``{"space": {...}, ...}``).
 
         Args:
             seed: An optional list of ints or int to seed the (sub-)spaces.

gymnasium/spaces/sequence.py

@@ -72,9 +72,10 @@ class Sequence(Space[typing.Tuple[Any, ...]]):
             mask: An optional mask for (optionally) the length of the sequence and (optionally) the values in the sequence.
                 If you specify `mask`, it is expected to be a tuple of the form `(length_mask, sample_mask)` where `length_mask`
                 is
-                - `None` The length will be randomly drawn from a geometric distribution
+
-                - `np.ndarray` of integers, in which case the length of the sampled sequence is randomly drawn from this array.
+                * ``None`` The length will be randomly drawn from a geometric distribution
-                - `int` for a fixed length sample
+                * ``np.ndarray`` of integers, in which case the length of the sampled sequence is randomly drawn from this array.
+                * ``int`` for a fixed length sample
                 The second element of the mask tuple `sample` mask specifies a mask that is applied when
                 sampling elements from the base space. The mask is applied for each feature space sample.
 

gymnasium/spaces/tuple.py

@@ -52,9 +52,10 @@ class Tuple(Space[typing.Tuple[Any, ...]], typing.Sequence[Any]):
         """Seed the PRNG of this space and all subspaces.
 
         Depending on the type of seed, the subspaces will be seeded differently
-        * None - All the subspaces will use a random initial seed
+
-        * Int - The integer is used to seed the `Tuple` space that is used to generate seed values for each of the subspaces. Warning, this does not guarantee unique seeds for all of the subspaces.
+        * ``None`` - All the subspaces will use a random initial seed
-        * List - Values used to seed the subspaces. This allows the seeding of multiple composite subspaces (`List(42, 54, ...)`).
+        * ``Int`` - The integer is used to seed the `Tuple` space that is used to generate seed values for each of the subspaces. Warning, this does not guarantee unique seeds for all of the subspaces.
+        * ``List`` - Values used to seed the subspaces. This allows the seeding of multiple composite subspaces (``List(42, 54, ...``).
 
         Args:
             seed: An optional list of ints or int to seed the (sub-)spaces.

gymnasium/spaces/utils.py

@@ -47,8 +47,8 @@ def flatdim(space: Space[Any]) -> int:
         The number of dimensions for the flattened spaces
 
     Raises:
-         NotImplementedError: if the space is not defined in ``gym.spaces``.
+         NotImplementedError: if the space is not defined in :mod:`gym.spaces`.
-         ValueError: if the space cannot be flattened into a :class:`Box`
+         ValueError: if the space cannot be flattened into a :class:`gymnasium.spaces.Box`
     """
     if space.is_np_flattenable is False:
         raise ValueError(
@@ -135,20 +135,22 @@ def flatten(space: Space[T], x: T) -> FlatType:
         x: The value to flatten
 
     Returns:
-        - For ``Box`` and ``MultiBinary``, this is a flattened array
+        The flattened datapoint
-        - For ``Discrete`` and ``MultiDiscrete``, this is a flattened one-hot array of the sample
+
-        - For ``Tuple`` and ``Dict``, this is a concatenated array the subspaces (does not support graph subspaces)
+            - For :class:`gymnasium.spaces.Box` and :class:`gymnasium.spaces.MultiBinary`, this is a flattened array
-        - For graph spaces, returns `GraphInstance` where:
+            - For :class:`gymnasium.spaces.Discrete` and :class:`gymnasium.spaces.MultiDiscrete`, this is a flattened one-hot array of the sample
-            - `nodes` are n x k arrays
+            - For :class:`gymnasium.spaces.Tuple` and :class:`gymnasium.spaces.Dict`, this is a concatenated array the subspaces (does not support graph subspaces)
-            - `edges` are either:
+            - For graph spaces, returns :class:`GraphInstance` where:
-                - m x k arrays
+                - :attr:`GraphInstance.nodes` are n x k arrays
-                - None
+                - :attr:`GraphInstance.edges` are either:
-            - `edge_links` are either:
+                    - m x k arrays
-                - m x 2 arrays
+                    - None
-                - None
+                - :attr:`GraphInstance.edge_links` are either:
+                    - m x 2 arrays
+                    - None
 
     Raises:
-        NotImplementedError: If the space is not defined in ``gymnasium.spaces``.
+        NotImplementedError: If the space is not defined in :mod:`gymnasium.spaces`.
     """
     raise NotImplementedError(f"Unknown space: `{space}`")
 
@@ -196,7 +198,7 @@ def _flatten_dict(space: Dict, x: dict[str, Any]) -> dict[str, Any] | NDArray[An
 
 @flatten.register(Graph)
 def _flatten_graph(space: Graph, x: GraphInstance) -> GraphInstance:
-    """We're not using `.unflatten() for :class:`Box` and :class:`Discrete` because a graph is not a homogeneous space, see `.flatten` docstring."""
+    """We're not using ``.unflatten()`` for :class:`Box` and :class:`Discrete` because a graph is not a homogeneous space, see `.flatten` docstring."""
 
     def _graph_unflatten(
         unflatten_space: Discrete | Box | None,
@@ -254,7 +256,7 @@ def unflatten(space: Space[T], x: FlatType) -> T:
         A point with a structure that matches the space.
 
     Raises:
-        NotImplementedError: if the space is not defined in ``gymnasium.spaces``.
+        NotImplementedError: if the space is not defined in :mod:`gymnasium.spaces`.
     """
     raise NotImplementedError(f"Unknown space: `{space}`")
 
@@ -359,14 +361,16 @@ def _unflatten_sequence(space: Sequence, x: tuple[Any, ...]) -> tuple[Any, ...]:
 def flatten_space(space: Space[Any]) -> Box | Dict | Sequence | Tuple | Graph:
     """Flatten a space into a space that is as flat as possible.
 
-    This function will attempt to flatten `space` into a single :class:`Box` space.
+    This function will attempt to flatten ``space`` into a single :class:`gymnasium.spaces.Box` space.
-    However, this might not be possible when `space` is an instance of :class:`Graph`,
+    However, this might not be possible when ``space`` is an instance of :class:`gymnasium.spaces.Graph`,
-    :class:`Sequence` or a compound space that contains a :class:`Graph` or :class:`Sequence`space.
+    :class:`gymnasium.spaces.Sequence` or a compound space that contains a :class:`gymnasium.spaces.Graph`
+    or :class:`gymnasium.spaces.Sequence` space.
     This is equivalent to :func:`flatten`, but operates on the space itself. The
-    result for non-graph spaces is always a `Box` with flat boundaries. While
+    result for non-graph spaces is always a :class:`gymnasium.spaces.Box` with flat boundaries. While
-    the result for graph spaces is always a `Graph` with `node_space` being a `Box`
+    the result for graph spaces is always a :class:`gymnasium.spaces.Graph` with
-    with flat boundaries and `edge_space` being a `Box` with flat boundaries or
+    :attr:`Graph.node_space` being a ``Box``
-    `None`. The box has exactly :func:`flatdim` dimensions. Flattening a sample
+    with flat boundaries and :attr:`Graph.edge_space` being a ``Box`` with flat boundaries or
+    ``None``. The box has exactly :func:`flatdim` dimensions. Flattening a sample
     of the original space has the same effect as taking a sample of the flattened
     space. However, sampling from the flattened space is not necessarily reversible.
     For example, sampling from a flattened Discrete space is the same as sampling from
@@ -415,7 +419,7 @@ def flatten_space(space: Space[Any]) -> Box | Dict | Sequence | Tuple | Graph:
         A flattened Box
 
     Raises:
-        NotImplementedError: if the space is not defined in ``gym.spaces``.
+        NotImplementedError: if the space is not defined in :mod:`gymnasium.spaces`.
     """
     raise NotImplementedError(f"Unknown space: `{space}`")