Qiskit / qiskit / 19169133469

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Build Type

push

github

Committed by web-flow

Commit Message

Skip intermediate PyList in PauliProductMeasurement::create_py_op() (#15310)

In the recently merged #15126 the PauliProductMeasurement operation
being added to Rust was unecessarily creating a pylist to go from
`Vec<bool>` -> `np.array[bool]` for the z and x parameters while we can
leverage rust-numpy to go straight from a Vec to a numpy array. This
was raised in review for the PR, but the fix just changed the mechanism
a Pylist was created by and didn't actually remove the python list
creation. `into_bound_py_any()` just is a short cut for using the
default IntoPyObject trait's conversion and casting it as a PyAny. In
the case of `Vec<T>` that means it's converting to a `PyList<T>`. Doing
this still results in 2 copies, one of which is done in Python. This
commit fixes the issue by using `to_pyarray()` to copy the Vec<bool>
directly into a numpy owned array. We have to copy still since we aren't
deleting the owning PauliProductMeasurement in Rust so we can't use
`into_pyarray()` which would avoid that copy. But this sill reduces the
numbers of copies needed to make the numpy arrays in Python.

Run Details

2 of 2 new or added lines in 1 file covered. (100.0%)

21 existing lines in 5 files now uncovered.

94214 of 106865 relevant lines covered (88.16%)

1149659.55 hits per line