qml.gradients.generate_multishifted_tapes¶
- generate_multishifted_tapes(tape, indices, shifts, multipliers=None)[source]¶
Generate a list of tapes where multiple marked trainable parameters have been shifted by the provided shift values.
- Parameters
tape (QuantumTape) – input quantum tape
indices (Sequence[int]) – indices of the trainable parameters to shift
shifts (Sequence[Sequence[float or int]]) – Nested sequence of shift values. The length of the outer Sequence determines how many parameter-shifted tapes are created. The lengths of the inner sequences should match and have the same length as
indices.multipliers (Sequence[Sequence[float or int]]) – Nested sequence of multiplier values of the same format as shifts`. Each multiplier scales the corresponding gate parameter before the shift is applied. If not provided, the parameters will not be scaled.
- Returns
- List of quantum tapes. Each tape has the marked parameters
indicated by
indicesshifted by the values ofshifts. The number of tapes will match the summed lengths of all inner sequences inshiftsandmultipliers(if provided).
- Return type
list[QuantumTape]