mirror of https://github.com/Qiskit/qiskit.git
Implement a capacity-allocated constructor for `DAGCircuit` in Rust. (#12975)
* Initial: implement fixed capacity constructor for DAGCircuit - Implement `DAGCircuit` with `with_capacity` to create an initially allocated instance, for rust only. - Implement `with_capacity` for `BitData` and `IndexInterner` that creates an initally allocated instance of each type. - Other small tweaks and fixes. - Add num_edges optional argument. If known, use `num_edges` argument to create a `DAGCircuit` with the exact number of edges. - Leverage usage of new method in `copy_empty_like`. - Use `..Default::default()` for `op_names` and `calibrations` fields in `DAGCircuit::with_capacity()` * Fix: Adapt to #13033 * Fix: Re-arrange the function arguments as per @mtreinish's review. - The order now follows: qubits, clbits, vars, num_ops, edges. As per [Matthew's comment](https://github.com/Qiskit/qiskit/pull/12975#discussion_r1742426093).
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@ -95,6 +95,15 @@ where
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}
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}
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pub fn with_capacity(py: Python<'_>, description: String, capacity: usize) -> Self {
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BitData {
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description,
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bits: Vec::with_capacity(capacity),
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indices: HashMap::with_capacity(capacity),
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cached: PyList::empty_bound(py).unbind(),
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}
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}
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/// Gets the number of bits.
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pub fn len(&self) -> usize {
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self.bits.len()
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@ -1556,7 +1556,14 @@ def _format(operand):
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/// DAGCircuit: An empty copy of self.
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#[pyo3(signature = (*, vars_mode="alike"))]
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fn copy_empty_like(&self, py: Python, vars_mode: &str) -> PyResult<Self> {
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let mut target_dag = DAGCircuit::new(py)?;
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let mut target_dag = DAGCircuit::with_capacity(
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py,
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self.num_qubits(),
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self.num_clbits(),
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Some(self.num_vars()),
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None,
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None,
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)?;
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target_dag.name = self.name.as_ref().map(|n| n.clone_ref(py));
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target_dag.global_phase = self.global_phase.clone();
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target_dag.duration = self.duration.as_ref().map(|d| d.clone_ref(py));
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@ -6156,6 +6163,69 @@ impl DAGCircuit {
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}
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Ok(())
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}
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/// Alternative constructor, builds a DAGCircuit with a fixed capacity.
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///
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/// # Arguments:
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/// - `py`: Python GIL token
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/// - `num_qubits`: Number of qubits in the circuit
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/// - `num_clbits`: Number of classical bits in the circuit.
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/// - `num_vars`: (Optional) number of variables in the circuit.
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/// - `num_ops`: (Optional) number of operations in the circuit.
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/// - `num_edges`: (Optional) If known, number of edges in the circuit.
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pub fn with_capacity(
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py: Python,
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num_qubits: usize,
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num_clbits: usize,
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num_vars: Option<usize>,
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num_ops: Option<usize>,
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num_edges: Option<usize>,
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) -> PyResult<Self> {
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let num_ops: usize = num_ops.unwrap_or_default();
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let num_vars = num_vars.unwrap_or_default();
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let num_edges = num_edges.unwrap_or(
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num_qubits + // 1 edge between the input node and the output node or 1st op node.
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num_clbits + // 1 edge between the input node and the output node or 1st op node.
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num_vars + // 1 edge between the input node and the output node or 1st op node.
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num_ops, // In Average there will be 3 edges (2 qubits and 1 clbit, or 3 qubits) per op_node.
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);
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let num_nodes = num_qubits * 2 + // One input + One output node per qubit
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num_clbits * 2 + // One input + One output node per clbit
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num_vars * 2 + // One input + output node per variable
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num_ops;
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Ok(Self {
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name: None,
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metadata: Some(PyDict::new_bound(py).unbind().into()),
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calibrations: HashMap::default(),
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dag: StableDiGraph::with_capacity(num_nodes, num_edges),
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qregs: PyDict::new_bound(py).unbind(),
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cregs: PyDict::new_bound(py).unbind(),
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qargs_interner: Interner::with_capacity(num_qubits),
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cargs_interner: Interner::with_capacity(num_clbits),
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qubits: BitData::with_capacity(py, "qubits".to_string(), num_qubits),
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clbits: BitData::with_capacity(py, "clbits".to_string(), num_clbits),
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global_phase: Param::Float(0.),
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duration: None,
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unit: "dt".to_string(),
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qubit_locations: PyDict::new_bound(py).unbind(),
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clbit_locations: PyDict::new_bound(py).unbind(),
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qubit_io_map: Vec::with_capacity(num_qubits),
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clbit_io_map: Vec::with_capacity(num_clbits),
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var_input_map: _VarIndexMap::new(py),
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var_output_map: _VarIndexMap::new(py),
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op_names: IndexMap::default(),
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control_flow_module: PyControlFlowModule::new(py)?,
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vars_info: HashMap::with_capacity(num_vars),
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vars_by_type: [
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PySet::empty_bound(py)?.unbind(),
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PySet::empty_bound(py)?.unbind(),
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PySet::empty_bound(py)?.unbind(),
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],
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})
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}
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/// Get qargs from an intern index
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pub fn get_qargs(&self, index: Interned<[Qubit]>) -> &[Qubit] {
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self.qargs_interner.get(index)
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@ -125,6 +125,13 @@ where
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_type: PhantomData,
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}
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}
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pub fn with_capacity(capacity: usize) -> Self {
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Self(IndexSet::with_capacity_and_hasher(
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capacity,
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::ahash::RandomState::new(),
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))
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}
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}
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impl<T> Interner<T>
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