BlockCollapser

class qiskit.dagcircuit.BlockCollapser(dag)

Bases: object

This class implements various strategies of consolidating blocks of nodes in a DAG (direct acyclic graph). It works both with the DAGCircuit and DAGDependency DAG representations.

Parameters:

dag (Union[DAGCircuit, DAGDependency]) -- The input DAG.

Raises:

DAGCircuitError -- the input object is not a DAG.

Methods

collapse_to_operation(blocks, collapse_fn)

For each block, constructs a quantum circuit containing instructions in the block, then uses collapse_fn to collapse this circuit into a single operation.