qml.workflow.interfaces.autograd.vjp

vjp(ans, parameters, tapes, execute_fn, jpc)

Returns the vector-Jacobian product operator for a batch of quantum tapes.

Parameters

• ans (array) – the result of the batch tape execution

• parameters (list[list[Any]]) – Nested list of the quantum tape parameters. This argument should be generated from the provided list of tapes.

• tapes (Sequence[QuantumTape]) – batch of tapes to execute

• execute_fn (Callable[[Sequence[QuantumTape]], ResultBatch]) – a function that turns a batch of circuits into results

• jpc (JacobianProductCalculator) – a class that can compute the vector Jacobian product (VJP) for the input tapes.

Returns

this function accepts the backpropagation gradient output vector, and computes the vector-Jacobian product

Return type

function

code/api/pennylane.workflow.interfaces.autograd.vjp

 

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