catalyst.autograph_ignore_fallbacks

autograph_ignore_fallbacks = False

Specify whether AutoGraph should avoid raising warnings when conversion fails and control flow instead falls back to being interpreted by Python at compile-time.

Example

In certain cases, AutoGraph will fail to convert control flow (for example, when an object that can not be converted to a JAX array is indexed in a loop), and will raise a warning informing of the failure.

>>> @qjit(autograph=True)
... @qml.qnode(dev)
... def f():
...     x = ["0.1", "0.2", "0.3"]
...     for i in range(3):
...         qml.RX(float(x[i]), wires=i)
...     return qml.expval(qml.PauliZ(0))
Warning: Tracing of an AutoGraph converted for loop failed with an exception:
...
If you intended for the conversion to happen, make sure that the (now dynamic)
loop variable is not used in tracing-incompatible ways, for instance by indexing a
Python list with it. In that case, the list should be wrapped into an array.

Setting this variable to True will suppress warning messages:

>>> catalyst.autograph_strict_conversion = False
>>> catalyst.autograph_ignore_fallbacks = True
>>> @qjit(autograph=True)
... @qml.qnode(dev)
... def f():
...     x = ["0.1", "0.2", "0.3"]
...     for i in range(3):
...         qml.RX(float(x[i]), wires=i)
...     return qml.expval(qml.PauliZ(0))
>>> f()
array(0.99500417)

Type

bool

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