QuantumGenerator

class QuantumGenerator(bounds, num_qubits, generator_circuit=None, init_params=None, optimizer=None, gradient_function=None, snapshot_dir=None)

기반 클래스: GenerativeNetwork

Quantum Generator.

The quantum generator is a parametrized quantum circuit which can be trained with the QGAN algorithm to generate a quantum state which approximates the probability distribution of given training data. At the beginning of the training the parameters will be set randomly, thus, the output will is random. Throughout the training the quantum generator learns to represent the target distribution. Eventually, the trained generator can be used for state preparation e.g. in QAE.

매개변수:

• bounds (ndarray) – k min/max data values [[min_1,max_1],…,[min_k,max_k]], given input data dim k

• num_qubits (List[int] | ndarray) – k numbers of qubits to determine representation resolution, i.e. n qubits enable the representation of 2**n values [n_1,…, n_k]

• generator_circuit (QuantumCircuit | None) – a QuantumCircuit implementing the generator.

• init_params (List[float] | ndarray | None) – 1D numpy array or list, Initialization for the generator’s parameters.

• optimizer (Optimizer | None) – optimizer to be used for the training of the generator

• gradient_function (Callable | Gradient | None) – A Gradient object, or a function returning partial derivatives of the loss function w.r.t. the generator variational params.

• snapshot_dir (str | None) – str or None, if not None save the optimizer’s parameter after every update step to the given directory

예외 발생:

QiskitMachineLearningError – Set multivariate variational distribution to represent multivariate data

Attributes

discriminator	Get discriminator.
optimizer	Get optimizer.
parameter_values	Get parameter values from the quantum generator
seed	Get seed.

Methods

construct_circuit([params])	Construct generator circuit.
get_output(quantum_instance[, params, shots])	Get classical data samples from the generator.
loss(x, weights)	Loss function for training the generator's parameters.
train([quantum_instance, shots])	Perform one training step w.r.t to the generator's parameters