Qiskit / qiskit-fermions / 27599251990

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fix: correctly compute mean of absolute coeffs during qDrift (#141)

It was pointed out that the in-place addition with clever numpy indexing
was not implementing the correct mathematical operation. Instead of
accumulating the values with duplicate indices, the last write operation
would win, resulting in a wrong mean. Using `np.add.at` resolves this
problem.

Closes #140

Co-authored-by: YoelShoshan <yoelshoshan@gmail.com>

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