class_docstr: Apply an arbitrary, fixed unitary matrix.
  
  **Details:**
  
  * Number of wires: Any (the operation can act on any number of wires)
  * Number of parameters: 1
  * Gradient recipe: None
  
  Args:
      U (array[complex]): square unitary matrix
      wires(Sequence[int] or int): the wire(s) the operation acts on
      id (str): custom label given to an operator instance,
          can be useful for some applications where the instance has to be identified.
  
  **Example**
  
  >>> dev = qml.device('default.qutrit', wires=1)
  >>> U = np.array([[1, 1, 0], [1, -1, 0], [0, 0, np.sqrt(2)]]) / np.sqrt(2)
  >>> @qml.qnode(dev)
  ... def example_circuit():
  ...     qml.QutritUnitary(U, wires=0)
  ...     return qml.state()
  >>> print(example_circuit())
  [0.70710678+0.j 0.70710678+0.j 0.        +0.j]
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code: def label(self, decimals=None, base_label=None, cache=None):
      return super().label(
          decimals=decimals, base_label=base_label or "U", cache=cache
      )
  
imports: import warnings
  import pennylane
  from pennylane.operation import AnyWires, Operation
  from pennylane.wires import Wires
label_desc: Use image node_id 6 for calling the QutritUnitary obj's underlying member method code with example usage: obj.label(decimals, base_label, cache) and returns: super