"""Lock Actions."""
import logging
import numpy as np
from ...solutions import BaseSolution
from ...parameter import deref, Parameter
from ...env import warn, is_interactive
from .random import Change
from .base import Action, convert_str_to_parameter
from .sensing import OptimiseRFReadoutPhaseDC, SensingMatrixDC, SensingMatrixSolution
from ...simulations import CarrierSignalMatrixSimulation
from . import elements_to_name
from tqdm.auto import tqdm
import finesse.config
LOGGER = logging.getLogger(__name__)
[docs]class RunLocksSolution(BaseSolution):
"""Solution from applying the :class:`RunLocks` action.
Attributes
----------
iters : int
Number of steps lock has required
max_iterations : int
Maximum number of iterations this lock can do
error_signals : array_like
error signals during locking steps, shape [num_locks, max_iterations]
control_signals : array_like
Control signals during locking steps, shape [num_locks, max_iterations]
lock_names : tuple[str]
Names of locks being controlled, shape [num_locks]
feedback_names : tuple[str]
Names of feedback for each lock, shape [num_locks]
final : arrary_like
Final control signals, shape [num_locks]
sensing_matrix : SensingMatrixSolution, optional
The sensing matrix used when running the locks with Newton's method.
"""
def __init__(self, *args, **kwargs):
super().__init__(*args, **kwargs)
self.iters = 0
self.error_signals = None
self.control_signals = None
self.lock_names = ()
self.feedback_names = ()
self.final = None
self.max_iterations = 0
self.num_locks = 0
self.sensing_matrix = None
[docs]class RunLocks(Action):
"""An action that iteratively moves the system to lock. Currently, lock error
signals must be readouts, not detectors, for use in this action.
Parameters
----------
*locks : list, optional
A list of locks to use in each RunLocks step.
If not provided, all locks in model are used.
method : str, either "newton" or "proportional"
Which method to use in the locking iterations.
scale_factor : float
Factor by which to multiply all DOF changes. Should be set
below 1 if it is desired to minimize overshooting.
sensing_matrix : SensingMatrixSolution or None
Sensing matrix of gains used in locking, of the type
that would be returned by
state.apply(SensingMatrixDC(lock_dof_names, readout_names)
If None, the sensing matrix is recalculated. Recommended
to be None except when locking multiple times in a row,
e.g. with DragLocks.
max_iterations : int
The maximum number of locking steps in each execution
of RunLocks.
display_progress : boolean
When true, displays the status of the error signals
during locking iterations.
optimize_phase : boolean
When true, optimize readout demodulation phases
between lock DOFs and their paired readouts
prior to running locks.
d_dof_phase : float
Step size to use when optimizing the demodulation
phase for each error signal/DOF pair.
set_gains : boolean
Only applies if method is "proportional". If true,
sets the gains for each error signal/DOF pair.
If false, uses pre-set gains.
d_dof_gain : float
Step size to use when calculating the gain
for every pair of error signals and DOFs.
exception_on_fail : boolean
When true, raise exception if maximum iterations
are surpassed.
no_warning : boolean
When true, don't even raise a warning if maximum
iterations are reached. Recommended to be false
unless repeatedly testing locking.
pre_step : :class:`Action`
Action to apply on each step of the lock
show_progress_bar : boolean
Will enable the progress bar when true.
name : str
Name of the action.
"""
[docs] def __init__(
self,
*locks,
method="proportional",
scale_factor=1,
sensing_matrix=None,
max_iterations=10000,
display_progress=False,
optimize_phase=False,
d_dof_phase=1e-9,
set_gains=True,
d_dof_gain=1e-9,
exception_on_fail=True,
no_warning=False,
pre_step=None,
show_progress_bar=None,
name="run locks",
):
super().__init__(name)
self.locks = tuple((l if isinstance(l, str) else l.name) for l in locks)
self.max_iterations = max_iterations
self.method = method
self.scale_factor = scale_factor
self.sensing_matrix = sensing_matrix
self.display_progress = display_progress
self.optimize_phase = optimize_phase
self.d_dof_phase = d_dof_phase
self.set_gains = set_gains
self.d_dof_gain = d_dof_gain
self.exception_on_fail = exception_on_fail
self.no_warning = no_warning
self.pre_step = pre_step
# use local flag if provided, otherwise default to global setting
if show_progress_bar is not None:
self.show_progress_bar = show_progress_bar
else:
self.show_progress_bar = finesse.config.show_progress_bars
self.pbar = None
[docs] def init_pbar(self, locks):
# define template for lock status display
lock_format = " ".join(
[f"{lock.name} {{postfix[0][{lock.name}]}}" for lock in locks]
)
# create the progress bar
self.pbar = tqdm(
range(self.max_iterations),
initial=self.max_iterations,
desc="",
bar_format=f"{lock_format} |{{bar}}| {{n_fmt}}/{{total_fmt}}",
colour="red",
dynamic_ncols=True,
postfix=[dict((lock.name, "✗") for lock in locks), len(locks)],
disable=not self.show_progress_bar,
)
[docs] def update_pbar(self):
# decrement the counter
self.pbar.update(-1)
[docs] def update_pbar_lock(self, lock_name, is_locked):
# update the lock's status
if self.show_progress_bar:
self.pbar.postfix[0][lock_name] = "✔" if is_locked else "✘"
[docs] def complete_pbar(self):
# runs when the progress bar is considered complete
self.pbar.colour = "green"
self.pbar.refresh()
def _do(self, state):
# we need a carrier signal simulation to run the locks
if state.sim is None:
raise Exception("Simulation has not been built")
if not isinstance(state.sim, CarrierSignalMatrixSimulation):
raise NotImplementedError()
# gather locks from the model
if len(self.locks) > 0:
# use specified locks if they are enabled
locks = tuple(
state.model.elements[name]
for name in self.locks
if not state.model.elements[name].disabled
)
else:
# otherwise use all enabled locks
locks = tuple(lck for lck in state.model.locks if not lck.disabled)
# collect all lock related workspaces
dws = tuple(
next(
filter(
lambda x: x.oinfo.name == lock.error_signal.name,
set(
# workspaces can be in both lists
(*state.sim.readout_workspaces, *state.sim.detector_workspaces)
),
),
None,
)
for lock in locks
)
# Store initial parameters in case of failure so we can reset the model
initial_feedback = tuple(float(lock.feedback) for lock in locks)
# initialize the solution
sol = RunLocksSolution(self.name)
sol.max_iterations = self.max_iterations
sol.num_locks = len(locks)
sol.iters = -1
sol.error_signals = np.zeros((len(locks), self.max_iterations + 1))
sol.control_signals = np.zeros((len(locks), self.max_iterations + 1))
sol.lock_names = tuple(lock.name for lock in locks)
sol.feedback_names = tuple(deref(lock.feedback).full_name for lock in locks)
# set up the progress bar using all enabled locks
self.init_pbar(locks)
if self.display_progress:
GREEN = "\033[92m" if is_interactive() else ""
RED = "\033[91m" if is_interactive() else ""
# BOLD = "\033[1m" not used
END = "\033[0m" if is_interactive() else ""
print("Error Signal Residuals at Each Iteration (W):")
print(format("", "23s"), end="")
for lock in locks:
print(format(lock.name, "^15s"), end="")
# ----------------------------------------------------------------------
# Proportional method
# ----------------------------------------------------------------------
if self.method in "proportional":
# use the sensing matrix to set the gains?
# TODO: allow this method to set gains from the sensing matrix
# if self.set_gains:
# for idx, _ in enumerate(lock_dof_names):
# if "_Q" in err_sig_names[idx]:
# locks[idx].gain = -1 / sensing_matrix.out[idx, idx].imag
# else:
# locks[idx].gain = -1 / sensing_matrix.out[idx, idx].real
# compute as needed or until max iterations have been reached
recompute = True
while recompute and sol.iters < self.max_iterations:
sol.iters += 1
if self.display_progress:
print(
format("\nIteration Number ", "<20s")
+ format(sol.iters, "<3d"),
end="",
)
# run the pre-step action
if self.pre_step:
state.apply(self.pre_step)
# calculate the readout values
state.sim.run_carrier()
# compute as needed or until max iterations have been reached
recompute = False
for i in range(len(locks)):
# read the error
err = dws[i].get_output() - locks[i].offset
sol.error_signals[i, sol.iters] = err
# recompute if the error is too large
acc = locks[i].accuracy
if abs(err) >= acc:
# adjust the feedback
feedback = locks[i].gain * err * self.scale_factor
deref(locks[i].feedback).value += feedback
# store it
sol.control_signals[i, sol.iters] = feedback
# and go again
recompute = True
is_locked = abs(err) < acc
if self.display_progress:
str_color = GREEN if is_locked else RED
print(str_color + format(err, "^ 15.2e") + END, end="")
# update the lock status
self.update_pbar_lock(locks[i].name, is_locked)
# update the bar status
self.update_pbar()
# ----------------------------------------------------------------------
# Newton method
# ----------------------------------------------------------------------
elif self.method == "newton":
# this method requires the use of readouts
# TODO: make sure this can only be done with readouts (not pds)
err_sigs = [lock.error_signal for lock in locks]
err_sig_names = [sig.name for sig in err_sigs]
readout_names = [sig.readout.name for sig in err_sigs] # fails if pd
lock_dof_names = [deref(lock.feedback).component.name for lock in locks]
if self.display_progress:
print("\n" + format("", "23s"), end="")
for idx in range(len(locks)):
print(format(err_sig_names[idx] + "1", "^15s"), end="")
# optimize the phases?
if self.optimize_phase:
readout_names_I = [
[lock_dof_names[i], readout_names[i]]
for i in range(len(readout_names))
if "_I" in err_sig_names[i]
]
lock_rd_pairs = []
for i in readout_names_I:
lock_rd_pairs.extend(i)
state.apply(
OptimiseRFReadoutPhaseDC(*lock_rd_pairs, d_dof=self.d_dof_phase)
)
# a sensing matrix is required
if self.sensing_matrix is not None:
if type(self.sensing_matrix) == SensingMatrixSolution:
sensing_matrix = self.sensing_matrix
else:
raise Exception(
"Locks failed: invalid type of sensing matrix specified"
)
else:
sensing_matrix = state.apply(
SensingMatrixDC(lock_dof_names, readout_names)
)
# store the sensing maxtrix
sol.sensing_matrix = sensing_matrix
# Matrix of gains only for readout phases that are actually used in
# locks. Also transposes the sensing matrix, so that rows rather
# than columns correspond to error signals.
N = len(locks)
gain_matrix = np.zeros((N, N))
for dof_idx, _ in enumerate(lock_dof_names):
for rd_idx, _ in enumerate(readout_names):
# get the sensing matrix value
val = sensing_matrix.out[dof_idx, rd_idx]
# take imag or real depending on the type of signal
if "_Q" in err_sig_names[rd_idx]:
gain_matrix[rd_idx, dof_idx] = val.imag
else:
gain_matrix[rd_idx, dof_idx] = val.real
# Evaluate the inverse of the gain matrix/Jacobian. Assuming
# that we stay in the linear region for all DOFs/readouts, we evaluate
# the inverted Jacobian only once but use it in all iterations.
jacobian_inv = np.linalg.inv(gain_matrix) * self.scale_factor
# compute as needed or until max iterations have been reached
recompute = True
while recompute and sol.iters < self.max_iterations:
# set up the run
sol.iters += 1
recompute = False
if self.display_progress:
print()
print(
format("Iteration Number ", "<20s") + format(sol.iters, "<3d"),
end="",
)
# run the pre-step action
if self.pre_step:
state.apply(self.pre_step)
# recalculate the readout values
state.sim.run_carrier()
# gather the accuracy from the locks and error from the readouts
acc_vect = np.array([lock.accuracy for lock in locks])
err_vect = np.array(
[dws[i].get_output() - locks[i].offset for i in range(N)]
)
# calculate the new feedbacks using the inverted jacobian
feedback_vect = -1 * np.matmul(jacobian_inv, err_vect)
# for each lock
results = [None] * N
for i in range(N):
# store the error
sol.error_signals[i, sol.iters] = err_vect[i]
# if any error is too high, we need to recompute
if any(np.greater(abs(err_vect), acc_vect)):
# store the feedback increment
sol.control_signals[i, sol.iters] = feedback_vect[i]
# adjust the feedback
deref(locks[i].feedback).value += feedback_vect[i]
# let's do it again
recompute = True
results[i] = f"{locks[i].name} {err_vect[i]:.2g}"
is_locked = abs(err_vect[i]) < acc_vect[i]
if self.display_progress:
str_color = GREEN if is_locked else RED
print(str_color + format(err_vect[i], "^ 15.2e") + END, end="")
# update the lock status
self.update_pbar_lock(locks[i].name, is_locked)
# update the bar status
self.update_pbar()
# method not found!
else:
raise Exception("Locks failed: invalid method provided")
# if the locks still need to be recomputed then we've failed...
if recompute:
# reset the locks
for lock, value in zip(locks, initial_feedback):
deref(lock.feedback).value = value
# throw an exception?
if self.exception_on_fail:
raise Exception("Locks failed: max iterations reached")
# display a warning?
if not self.no_warning:
warn("Locks failed")
else:
# locks have successfully locked
self.complete_pbar()
# store the final feedback values in the solution
sol.final = np.array(
tuple(deref(lock.feedback).value for lock in locks), dtype=float
)
return sol
def _requests(self, model, memo, first=True):
# gather locks from the model
if len(self.locks) > 0:
# use specified locks if they are enabled
locks = tuple(
model.elements[name]
for name in self.locks
if not model.elements[name].disabled
)
else:
# otherwise use all enabled locks
locks = tuple(lck for lck in model.locks if not lck.disabled)
for lock in locks:
# the lock feedback values will be changing
memo["changing_parameters"].append(deref(lock.feedback).full_name)
# readouts might also be changing their phase
if (
self.optimize_phase
and hasattr(lock.error_signal, "readout")
and hasattr(lock.error_signal.readout, "phase")
):
memo["changing_parameters"].append(
lock.error_signal.readout.name + ".phase"
)
if self.pre_step:
self.pre_step._requests(model, memo)
[docs]class DragLocks(Action):
"""An action that incrementally changes model parameter values, reaching lock at
each step, until lock is reached at the desired final parameter values.
Parameters
----------
*locks : list, optional
A list of locks to use in each RunLocks step.
Acts like *locks parameter in RunLocks:
if not provided, all locks in model are used.
parameters : list
A list of strings. Each element should correspond
to a parameter in the model.
stop_points : list
The final parameter values that locks move
towards incrementally.
relative : boolean
If true, stop_points are relative to the initial
parameter values.
max_recursions : int
The number of times that the step size is allowed to decreased
by a factor of ten when locks fail.
method : str, either "newton" or "proportional"
The method to use in each locking step.
scale_factor : float
Factor by which to multiply all DOF changes. Should be set
below 1 if it is desired to minimize overshooting.
num_steps : int
Number of steps to calculate, starting at the initial point and ending
at the stop point.
never_optimize_phase : boolean
When true, never optimize readout phases. When false,
phases will be optimized anytime the previous step required
more than 10 iterations.
exception_on_fail : boolean
When true, raise exception if max_recursions is surpassed.
max_iterations : int
The maximum number of locking steps in each execution
of RunLocks. If surpassed, step size is decreased.
display_progress : boolean
When true, displays the status of the lock dragging.
name : str
Name of the action.
"""
def __init__(
self,
*locks,
parameters,
stop_points,
relative=False,
method="proportional",
scale_factor=1,
num_steps=11,
never_optimize_phase=True,
exception_on_fail=True,
max_recursions=5,
max_iterations=1000,
display_progress=False,
show_progress_bar=False,
name="drag locks",
):
super().__init__(name)
self.locks = tuple((l if isinstance(l, str) else l.name) for l in locks)
self.parameters = parameters
self.stop_points = np.array(stop_points)
if len(self.parameters) != len(self.stop_points):
raise ValueError("Unequal number of parameters and stopping points")
self.relative = relative
self.max_recursions = max_recursions
self.method = method
self.scale_factor = scale_factor
self.num_steps = num_steps
self.never_optimize_phase = never_optimize_phase
self.exception_on_fail = exception_on_fail
self.max_iterations = max_iterations
self.show_progress_bar = show_progress_bar
self.display_progress = display_progress
def _do(self, state):
# rq = self.get_requests(state.model)
# changing_params = tuple(
# convert_str_to_parameter(state.model, _) for _ in rq["changing_parameters"]
# )
def TryLocking(state, steps, recursion_num=0):
sensing_matrix = None
optimize_phase = not self.never_optimize_phase
for step_ind, step_vals in enumerate(steps):
# Change each parameter to its value at this step.
for p_ind, param_val in enumerate(step_vals):
state.apply(Change({self.parameters[p_ind]: param_val}))
# Run locks at this step.
try:
step_vals_str = str([format(val, "4.3e") for val in step_vals])
if self.display_progress:
print(
"\t" * recursion_num
+ f"Step {step_ind:2d} of {len(steps)-1}: ",
end="",
)
sol = state.apply(
RunLocks(
method=self.method,
scale_factor=self.scale_factor,
sensing_matrix=sensing_matrix,
exception_on_fail=True,
max_iterations=self.max_iterations,
optimize_phase=optimize_phase,
display_progress=False,
show_progress_bar=self.show_progress_bar,
)
)
# Print status of locking steps.
if self.display_progress:
print(
"Reached lock with",
self.parameters,
"= "
+ step_vals_str
+ " in "
+ str(sol.iters)
+ " iterations.",
)
# If the previous step converged very quickly, don't bother
# optimizing phases or recalculating the sensing matrix at
# the next step.
if sol.iters <= 10:
sensing_matrix = sol.sensing_matrix
optimize_phase = False
else:
sensing_matrix = None
optimize_phase = (
True if not self.never_optimize_phase else False
)
if self.display_progress:
print(
"\t" * recursion_num
+ "Step required more than 10 iterations."
+ " Recalculating sensing matrix in next step."
)
except Exception:
recursion_num += 1
if self.display_progress:
print(
"Failed to lock with",
self.parameters,
"= " + step_vals_str + ". Decreasing step size.",
)
if recursion_num >= self.max_recursions:
raise Exception("Maximum recursion level exceeded.")
if step_ind == 0:
new_step_vals = np.linspace(
steps[step_ind], steps[step_ind + 1], self.num_steps
)
else:
new_step_vals = np.linspace(
steps[step_ind - 1], steps[step_ind], self.num_steps
)
TryLocking(state, new_step_vals, recursion_num=recursion_num)
recursion_num -= 1
return sol
# Find the model parameters corresponding to the strings provided
p = [convert_str_to_parameter(state.model, param) for param in self.parameters]
p_vals = np.array([param.value for param in p])
# The parameter values that will be stepped through and locked to.
if not self.relative:
step_vals_list = np.linspace(p_vals, self.stop_points, self.num_steps)
else:
step_vals_list = np.linspace(
p_vals, p_vals + self.stop_points, self.num_steps
)
sol = TryLocking(state, step_vals_list)
return sol
def _requests(self, model, memo, first=True):
for param in self.parameters:
p = convert_str_to_parameter(model, param)
if isinstance(p, Parameter):
memo["changing_parameters"].append(param)
if len(self.locks) == 0:
# If none given lock everything
for lock in model.locks:
memo["changing_parameters"].append(deref(lock.feedback).full_name)
rd_name = lock.error_signal.name
if "_DC" not in rd_name:
memo["changing_parameters"].append(
lock.error_signal.readout.name + ".phase"
)
else:
for name in self.locks:
if name not in model.elements:
raise Exception(f"Model {model} does not have a lock called {name}")
memo["changing_parameters"].append(
deref(model.elements[name].feedback).full_name
)
rd_name = model.elements[name].error_signal.name
if "_DC" not in rd_name:
memo["changing_parameters"].append(
model.elements[name].error_signal.readout.name + ".phase"
)
[docs]class SetLockGains(Action):
"""An action that (optionally) optimizes phases for lock readouts with
:class:`OptimiseRFReadoutPhaseDC`, then sets optimal lock gains using the
sensing matrix found with :class:`SensingMatrixDC`.
Parameters
----------
*locks : list, optional
A list of locks for which to set the gain.
Acts like *locks parameter in RunLocks:
if not provided, all locks in model are used.
d_dof_phase : float, optional
Step size to use when optimizing the RF
readout phase.
d_dof_gain : float, optional
Step size to use when calculating the gain
for each error signal/DOF pair.
gain_scale : float, optional
Extra gain scaling factor applied to -1/sensing calculation.
optimize_phase : boolean, optional
Whether or not to optimize readout phases.
name : str
Name of the action.
"""
def __init__(
self,
*locks,
d_dof_phase=1e-10,
d_dof_gain=1e-10,
gain_scale=1,
optimize_phase=True,
name="set gains",
):
super().__init__(name)
self.locks = elements_to_name(locks)
self.d_dof_phase = d_dof_phase
self.d_dof_gain = d_dof_gain
self.optimize_phase = optimize_phase
self.gain_scale = gain_scale
def _do(self, state):
if state.sim is None:
raise Exception("Simulation has not been built")
if not isinstance(state.sim, CarrierSignalMatrixSimulation):
raise NotImplementedError()
if len(self.locks) == 0:
locks = tuple(lck for lck in state.model.locks)
else:
locks = tuple(state.model.elements[name] for name in self.locks)
err_sigs = [lck.error_signal for lck in locks]
err_sig_names = [sig.name for sig in err_sigs]
readout_names = [sig.readout.name for sig in err_sigs]
lock_dofs = [lck.feedback for lck in locks]
lock_dof_names = [deref(dof).component.name for dof in lock_dofs]
if self.optimize_phase:
readout_names_I = [
[lock_dof_names[i], readout_names[i]]
for i in range(len(readout_names))
if "_I" in err_sig_names[i]
]
lck_rd_pairs = []
for i in readout_names_I:
lck_rd_pairs.extend(i)
state.apply(OptimiseRFReadoutPhaseDC(*lck_rd_pairs, d_dof=self.d_dof_phase))
gain_matrix = state.apply(
SensingMatrixDC(lock_dof_names, readout_names, d_dof=self.d_dof_gain)
)
for idx, _ in enumerate(lock_dof_names):
err_sig = err_sig_names[idx]
val = gain_matrix.out[idx, idx]
if "_Q" in err_sig:
gain = val.imag
else:
gain = val.real
locks[idx].gain = -self.gain_scale / gain
def _requests(self, model, memo, first=True):
if len(self.locks) == 0:
# If none given lock everything
for lock in model.locks:
memo["changing_parameters"].append(deref(lock.feedback).full_name)
rd_name = lock.error_signal.name
if "_DC" not in rd_name:
memo["changing_parameters"].append(
lock.error_signal.readout.name + ".phase"
)
else:
for name in self.locks:
if name not in model.elements:
raise Exception(f"Model {model} does not have a lock called {name}")
memo["changing_parameters"].append(
deref(model.elements[name].feedback).full_name
)
rd_name = model.elements[name].error_signal.name
if "_DC" not in rd_name:
memo["changing_parameters"].append(
model.elements[name].error_signal.readout.name + ".phase"
)