Fix phase in factor #5847
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Fix phase in factor #5847
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tanujkhattar
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viathor
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Fixes quantumlib#5834 Phase in input tensor was being allocated to both output tensors. This PR readjusts to remove the phase from the remainder tensor (a nice thing about this is that if the remainder _is_ nothing but a global phase, then it's `1`). The validation is updated to check `np.all_close` rather than `allclose_up_to_global_phase` (I also ran all simulator unit tests with "validate=True" locally and they all passed with these changes), and a unit test for quantumlib#5834 is added. Also added check that we aren't factoring out the last qubit during simulation and losing the remaining phase. This isn't strictly necessary since the remainder is guaranteed to be `1`, but prevent any surprises if that changes (and may as well skip it anyway for perf sake).
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Fixes quantumlib#5834 Phase in input tensor was being allocated to both output tensors. This PR readjusts to remove the phase from the remainder tensor (a nice thing about this is that if the remainder _is_ nothing but a global phase, then it's `1`). The validation is updated to check `np.all_close` rather than `allclose_up_to_global_phase` (I also ran all simulator unit tests with "validate=True" locally and they all passed with these changes), and a unit test for quantumlib#5834 is added. Also added check that we aren't factoring out the last qubit during simulation and losing the remaining phase. This isn't strictly necessary since the remainder is guaranteed to be `1`, but prevent any surprises if that changes (and may as well skip it anyway for perf sake).
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Fixes #5834
Phase in input tensor was being allocated to both output tensors. This PR readjusts to remove the phase from the remainder tensor (a nice thing about this is that if the remainder is nothing but a global phase, then it's
1).The validation is updated to check
np.all_closerather thanallclose_up_to_global_phase(I also ran all simulator unit tests with "validate=True" locally and they all passed with these changes), and a unit test for #5834 is added.Also added check that we aren't factoring out the last qubit during simulation and losing the remaining phase. This isn't strictly necessary since the remainder is guaranteed to be
1, but prevent any surprises if that changes (and may as well skip it anyway for perf sake).