mirror of https://github.com/Qiskit/qiskit.git
19 lines
972 B
YAML
19 lines
972 B
YAML
---
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features:
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Refactored estimator gradients and sampler gradients for extensibility. Now, they have
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``_preprocess()`` to make a gradient circuit that has unique parameters to each parameter,
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and ``parameter_values`` and ``parameters`` are also updated to match the circuit.
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``_postprocess()`` computes the gradient of the original circuit from the gradient of the
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gradient circuit by using the chain rule. When users want to implement their own gradient classes,
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they can use ``_preprocess()`` and ``_postprocess()``. Then, they implement ``_run_unique()``
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that calculates a gradient of a circuit with unique parameters.
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fixes:
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:class:`.SamplerGradientResult` no longer makes a dict of size 2 ** qubits for a result.
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It will create only keys of the required size.
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Estimator gradients and sampler gradients combine all circuits into a single job to reduce
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overhead instead of throwing a job for each circuit.
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