Minor documentation changes for parameter broadcasting

doc/code/qml_operation.rst

@@ -36,5 +36,6 @@ new :class:`~pennylane.ops.qubit.attributes.Attribute` objects.
     ~ops.qubit.attributes.diagonal_in_z_basis
     ~ops.qubit.attributes.has_unitary_generator
     ~ops.qubit.attributes.self_inverses
+    ~ops.qubit.attributes.supports_broadcasting
     ~ops.qubit.attributes.symmetric_over_all_wires
     ~ops.qubit.attributes.symmetric_over_control_wires

doc/releases/changelog-dev.md

@@ -62,7 +62,7 @@
   [(#2663)](https://github.com/PennyLaneAI/pennylane/pull/2663)
   [(#2684)](https://github.com/PennyLaneAI/pennylane/pull/2684)
   [(#2688)](https://github.com/PennyLaneAI/pennylane/pull/2688)
-  
+
   A `reduced_dm` function that can handle both state vectors and density matrix, to return a reduced density matrix:
 
   ```pycon
@@ -303,13 +303,6 @@
   0.9905158135644924
   ```
 
-
-* Operators have new attributes `ndim_params` and `batch_size`, and `QuantumTapes` have the new
-  attribute `batch_size`.
-  - `Operator.ndim_params` contains the expected number of dimensions per parameter of the operator,
-  - `Operator.batch_size` contains the size of an additional parameter broadcasting axis, if present,
-  - `QuantumTape.batch_size` contains the `batch_size` of its operations (see below).
-
 * New `solarized_light` and `solarized_dark` styles available for drawing circuit diagram graphics.
   [(#2662)](https://github.com/PennyLaneAI/pennylane/pull/2662)
 

pennylane/tape/tape.py

@@ -1293,7 +1293,7 @@ def batch_size(self):
         .. seealso:: :attr:`~.Operator.batch_size` for details.
 
         Returns:
-            int: The batch size of the quantum tape.
+            int or None: The batch size of the quantum tape if present, else ``None``.
         """
         return self._batch_size
 

pennylane/transforms/broadcast_expand.py

@@ -57,7 +57,7 @@ def broadcast_expand(tape):
     with broadcasting axis of length ``3`` passed to ``qml.RX``:
 
     >>> x = pnp.array([0.2, 0.6, 1.0], requires_grad=True)
-    >>> qml.draw(expanded_circuit)(x)
+    >>> print(qml.draw(expanded_circuit)(x))
     0: ──RX(0.20)─┤  <Z>
     0: ──RX(0.60)─┤  <Z>
     0: ──RX(1.00)─┤  <Z>
@@ -71,13 +71,11 @@ def broadcast_expand(tape):
     We also can call the transform manually on a tape:
 
     >>> with qml.tape.QuantumTape() as tape:
-    >>>     qml.RX(np.array([0.2, 0.6, 1.0], requires_grad=True), wires=0)
+    >>>     qml.RX(pnp.array([0.2, 0.6, 1.0], requires_grad=True), wires=0)
     >>>     qml.expval(qml.PauliZ(0))
     >>> tapes, fn = qml.transforms.broadcast_expand(tape)
     >>> tapes
-    [<QuantumTape: wires=[0], params=1>,
-     <QuantumTape: wires=[0], params=1>,
-     <QuantumTape: wires=[0], params=1>]
+    [<QuantumTape: wires=[0], params=1>, <QuantumTape: wires=[0], params=1>, <QuantumTape: wires=[0], params=1>]
     >>> fn(qml.execute(tapes, qml.device("default.qubit", wires=1), None))
     array([0.98006658, 0.82533561, 0.54030231])
     """