Remove deprecated get_unitary_matrix (#2457)

* Remove * Changelog * changelog: breaking change * Trigger CI Co-authored-by: Antal Szava <antalszava@gmail.com>
PennyLaneAI · Apr 19, 2022 · 822da84 · 822da84
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diff --git a/doc/releases/changelog-dev.md b/doc/releases/changelog-dev.md
@@ -398,6 +398,10 @@
 
 <h3>Breaking changes</h3>
 
+* The `get_unitary_matrix` transform has been removed, users should use
+  `qml.matrix` instead.
+  [(#2457)](https://github.com/PennyLaneAI/pennylane/pull/2457)
+
 * The caching ability of `QubitDevice` has been removed, using the caching on
   the QNode level is the recommended alternative going forward.
   [(#2443)](https://github.com/PennyLaneAI/pennylane/pull/2443)

diff --git a/pennylane/transforms/__init__.py b/pennylane/transforms/__init__.py
@@ -32,7 +32,6 @@
     ~transforms.classical_jacobian
     ~batch_params
     ~batch_input
-    ~transforms.get_unitary_matrix
     ~metric_tensor
     ~adjoint_metric_tensor
     ~specs
@@ -206,7 +205,6 @@
 from .specs import specs
 from .qmc import apply_controlled_Q, quantum_monte_carlo
 from .unitary_to_rot import unitary_to_rot
-from .get_unitary_matrix import get_unitary_matrix
 from .commutation_dag import (
     commutation_dag,
     is_commuting,

diff --git a/pennylane/transforms/get_unitary_matrix.py b/pennylane/transforms/get_unitary_matrix.py