FirstOrderExpansion
class FirstOrderExpansion(feature_dimension, depth=2, data_map_func=<function self_product>)
DEPRECATED. First Order Expansion feature map.
This is a sub-class of PauliZExpansion where z_order is fixed at 1. As a result the first order expansion will be a feature map without entangling gates.
Parameters
- feature_dimension (
int) – The number of features - depth (
int) – The number of repeated circuits. Defaults to 2, has a minimum value of 1. - data_map_func (
Callable[[ndarray],float]) – A mapping function for data x which can be supplied to override the default mapping fromself_product().
Attributes
feature_dimension
returns feature dimension
num_qubits
returns number of qubits
support_parameterized_circuit
returns whether or not the sub-class support parameterized circuit
Methods
construct_circuit
FirstOrderExpansion.construct_circuit(x, qr=None, inverse=False)
Construct the second order expansion based on given data.
Parameters
- x (Union(numpy.ndarray, list[Parameter], ParameterVector)) – 1-D to-be-transformed data.
- qr (QuantumRegister, optional) – the QuantumRegister object for the circuit, if None, generate new registers with name q.
- inverse (bool, optional) – whether or not inverse the circuit
Returns
a quantum circuit transform data x.
Return type
Raises
- TypeError – invalid input
- ValueError – invalid input
get_entangler_map
static FirstOrderExpansion.get_entangler_map(map_type, num_qubits)
get entangle map
validate_entangler_map
static FirstOrderExpansion.validate_entangler_map(entangler_map, num_qubits)
validate entangler map