Integrate TransformProgram with QNode (#4404)

* Draft structure * draf exec * Simple execute * Update * More tests * Update * Update exec * Pylint and black * Update tests * Update more tests * More tests * changelog * Coverage * Cover fix * pylint * Pylint * Pylint tests * proposed changes to transform program integration * oops * add to legacy, remove cotransform support * just transform program call component * just transform program call component * no longer support cotransforms, fix _batch_postprocessing * some more testing * test null postprocessing function * docstring, rename batch_slices to slices, black * Apply suggestions from code review Co-authored-by: Matthew Silverman <[email protected]> * integrate transform program with qnode * adding integration tests * test modifications * [skip ci] fiddling * more testing * changelog entry * add to execute, start on testing * add qml.execute tests * Update doc/releases/changelog-dev.md Co-authored-by: Matthew Silverman <[email protected]> * fix test --------- Co-authored-by: rmoyard <[email protected]> Co-authored-by: Matthew Silverman <[email protected]>
PennyLaneAI · Aug 8, 2023 · 572bfbc · 572bfbc
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diff --git a/doc/releases/changelog-dev.md b/doc/releases/changelog-dev.md
@@ -44,6 +44,31 @@ array([False, False])
 * Functions added to convert wavefunctions obtained from `PySCF` to a state vector.
   [(#4427)](https://github.com/PennyLaneAI/pennylane/pull/4427)
 
+* Transform Programs are now integrated with the `QNode`.
+  [(#4404)](https://github.com/PennyLaneAI/pennylane/pull/4404)
+
+```
+def null_postprocessing(results: qml.typing.ResultBatch) -> qml.typing.Result:
+    return results[0]
+
+@qml.transforms.core.transform
+def scale_shots(tape: qml.tape.QuantumTape, shot_scaling) -> (Tuple[qml.tape.QuantumTape], Callable):
+    new_shots = tape.shots.total_shots * shot_scaling
+    new_tape = qml.tape.QuantumScript(tape.operations, tape.measurements, shots=new_shots)
+    return (new_tape, ), null_postprocessing
+
+dev = qml.devices.experimental.DefaultQubit2()
+
+@partial(scale_shots, shot_scaling=2)
+@qml.qnode(dev, interface=None)
+def circuit():
+    return qml.sample(wires=0)
+
+```
+
+>>> circuit(shots=1)
+array([False, False])
+
 <h3>Improvements 🛠</h3>
 
 * Wires can now be reused after making a mid-circuit measurement on them.