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fixing grad nan

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This commit is contained in:
Mattia Robbiano
2025-09-20 15:15:40 +02:00
parent 63266c5ba0
commit 9853e86deb
2 changed files with 70 additions and 14 deletions
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4
examples/quimb_intro/test.py
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@@ -30,13 +30,14 @@ def build_circuit(nqubits, nlayers):
for q in range(nqubits):
circ.add(gates.RY(q=q, theta=0.))
circ.add(gates.RZ(q=q, theta=0.))
[circ.add(gates.CNOT(q%nqubits, (q+1)%nqubits) for q in range(nqubits))]
[circ.add(gates.CZ(q % nqubits, (q + 1) % nqubits)) for q in range(nqubits)]
circ.add(gates.M(*range(nqubits)))
return circ
nqubits = 4
circuit = build_circuit(nqubits=nqubits, nlayers=3)
quimb_circuit = quimb_backend._qibo_circuit_to_quimb(circuit)
def f(params):
circuit.set_parameters(params)
@@ -46,5 +47,4 @@ def f(params):
)
parameters = np.random.uniform(-np.pi, np.pi, size=len(circuit.get_parameters()))
print(f(parameters))
print(jax.value_and_grad(f)(parameters))

72
src/qibotn/backends/quimb.py
View File

@@ -14,27 +14,35 @@ from qibo.result import QuantumState
from qibotn.backends.abstract import QibotnBackend
from qibotn.result import TensorNetworkResult
from qibo.gates.abstract import ParametrizedGate
GATE_MAP = {
"h": "H",
"x": "X",
"y": "Y",
"z": "Z",
"s": "S",
"sdg": "SDG",
"t": "T",
"tdg": "TDG",
"sx": "SX",
"sxdg": "SXDG",
"rx": "RX",
"ry": "RY",
"rz": "RZ",
"u1": "U1",
"u2": "U2",
"u3": "U3",
"cx": "CNOT",
"cx": "CX",
"cnot": "CNOT",
"cy": "CY",
"cz": "CZ",
"iswap": "ISWAP",
"swap": "SWAP",
"ccx": "CCX",
@@ -368,6 +376,45 @@ class QuimbBackend(QibotnBackend, NumpyBackend):
return A_new, B_new, C_new
# def _qibo_circuit_to_quimb(self, qibo_circ, quimb_circuit_type=qtn.Circuit, **circuit_kwargs):
# """
# Convert a Qibo Circuit to a Quimb Circuit.
# Parameters
# ----------
# qibo_circ : qibo.models.circuit.Circuit
# The circuit to convert.
# quimb_circuit_type : type
# The Quimb circuit class to use (Circuit, CircuitMPS, etc).
# circuit_kwargs : dict
# Extra arguments to pass to the Quimb circuit constructor.
# Returns
# -------
# circ : quimb.tensor.circuit.Circuit
# The converted circuit.
# """
# nqubits = qibo_circ.nqubits
# quimb_gates = []
# circ = quimb_circuit_type(nqubits, **circuit_kwargs)
# for gate in qibo_circ.queue:
# gname = getattr(gate, "name", None)
# qname = GATE_MAP.get(gname, None)
# if qname is None:
# continue # skip measurements and unknown gates
# # Handle parametrized gates (Qibo: .parameters, Quimb: expects flat tuple)
# params = getattr(gate, "parameters", ())
# qubits = getattr(gate, "qubits", ())
# # Quimb expects (*params, *qubits)
# gate_spec = (qname,) + tuple(params) + tuple(qubits)
# quimb_gates.append(gate_spec)
# circ.apply_gates(quimb_gates)
# return circ
def _qibo_circuit_to_quimb(self, qibo_circ, quimb_circuit_type=qtn.Circuit, **circuit_kwargs):
"""
Convert a Qibo Circuit to a Quimb Circuit.
@@ -387,7 +434,7 @@ class QuimbBackend(QibotnBackend, NumpyBackend):
The converted circuit.
"""
nqubits = qibo_circ.nqubits
quimb_gates = []
circ = quimb_circuit_type(nqubits, **circuit_kwargs)
for gate in qibo_circ.queue:
gname = getattr(gate, "name", None)
@@ -395,14 +442,23 @@ class QuimbBackend(QibotnBackend, NumpyBackend):
if qname is None:
continue # skip measurements and unknown gates
# Handle parametrized gates (Qibo: .parameters, Quimb: expects flat tuple)
params = getattr(gate, "parameters", ())
qubits = getattr(gate, "qubits", ())
# Quimb expects (*params, *qubits)
gate_spec = (qname,) + tuple(params) + tuple(qubits)
quimb_gates.append(gate_spec)
# Check if the gate is parametrized
is_parametrized = isinstance(gate, ParametrizedGate)
circ = quimb_circuit_type(nqubits, **circuit_kwargs)
circ.apply_gates(quimb_gates)
if is_parametrized:
circ.apply_gate(
qname,
*params,
*qubits,
parametrized= is_parametrized
)
else:
circ.apply_gate(
qname,
*params,
*qubits,
)
return circ