Calling DynamicsBackend.solve(...) with parameter y0 of type np.array throws the exception:
ValueError Traceback (most recent call last)
Cell In[18], line 12
9 with pulse.build() as example_schedule:
10 pulse.play(pulse.Constant(duration, 0.1), pulse.DriveChannel(0))
---> 12 backend.solve([example_schedule], t_span=[0, duration * FakeNairobi().configuration().dt], y0=np.eye(9))
14 # backend.options.solver.model.static_operator.shape
15
16 # backend.options.solver.solve(t_span=[0, duration * FakeNairobi().configuration().dt], y0=np.eye(9), signals=[example_schedule])
File ~/Workspace/git/quantum-optimal-control-algorithms/.venv/lib/python3.11/site-packages/qiskit_dynamics/backend/dynamics_backend.py:383, in DynamicsBackend.solve(self, solve_input, t_span, y0, convert_results, validate)
381 if y0 is None:
382 y0 = self.options.initial_state
--> 383 if y0 == "ground_state":
384 y0 = Statevector(self._dressed_states[:, 0])
386 solver_results = self.options.solver.solve(
387 t_span=t_span,
388 y0=y0,
(...)
391 **self.options.solver_options,
392 )
ValueError: The truth value of an array with more than one element is ambiguous. Use a.any() or a.all()
This might also happen when using a Jax Array or so, which I haven't tried.
Steps to reproduce the problem
import numpy as np
from qiskit import pulse
from qiskit_ibm_runtime.fake_provider import FakeNairobi
from qiskit_dynamics import DynamicsBackend
backend = DynamicsBackend.from_backend(FakeNairobi(), subsystem_list=[0,1])
with pulse.build() as example_schedule:
pulse.play(pulse.Constant(64, 0.1), pulse.DriveChannel(0))
backend.solve([example_schedule], t_span=[0, 1 * FakeNairobi().configuration().dt], y0=np.eye(9))
What is the expected behavior?
Return the solution without exception.
Suggested solutions
First naive thought would be, adding a check for str in DynamicsBackend.solve(...) before Line 383 to avoid the == between str and np.array type.
Informations
0.5.0
3.11.8
Ubuntu 22.04
What is the current behavior?
Calling
DynamicsBackend.solve(...)
with parametery0
of typenp.array
throws the exception:This might also happen when using a Jax Array or so, which I haven't tried.
Steps to reproduce the problem
What is the expected behavior?
Return the solution without exception.
Suggested solutions
First naive thought would be, adding a check for
str
inDynamicsBackend.solve(...)
before Line 383 to avoid the==
betweenstr
andnp.array
type.