def test_parametrization():
updated_info, products = run(info)
sample = products["sample"]
for i, point in sample:
a = info[_params]["a"]
b = get_external_function(info[_params]["b"])(a, point["bprime"])
d = get_external_function(d_func)(a)
e = get_external_function(e_func)(b)
f = get_external_function(info[_params]["f"]["derived"])(x_func(
point["c"]))
assert np.allclose(point[[_derived_pre + p for p in ["d", "e", "f"]]],
[d, e, f])
def test_parameterization():
updated_info, sampler = run(info)
products = sampler.products()
sample = products["sample"]
from getdist.mcsamples import MCSamplesFromCobaya
gdsample = MCSamplesFromCobaya(updated_info, products["sample"])
for i, point in sample:
a = info[_params]["a"]
b = get_external_function(info[_params]["b"])(a, point["bprime"])
c = get_external_function(info[_params]["c"])(a, point["cprime"])
e = get_external_function(e_func)(b)
f = get_external_function(f_func)(b)
g = get_external_function(info[_params]["g"]["derived"])(x_func(
point["c"]))
h = get_external_function(info[_params]["h"])(info[_params]["i"])
j = get_external_function(info[_params]["j"])(b)
k = get_external_function(info[_params]["k"]["derived"])(f)
assert np.allclose(point[["b", "c", "e", "f", "g", "h", "j", "k"]],
[b, c, e, f, g, h, j, k])
# Test for GetDist too (except fixed ones, ignored by GetDist)
bcefffg_getdist = [
gdsample.samples[i][gdsample.paramNames.list().index(p)]
for p in ["b", "c", "e", "f", "g", "j", "k"]
]
assert np.allclose(bcefffg_getdist, [b, c, e, f, g, j, k])
def __init__(self, name, info, parameterization, _theory=None, timing=None):
self.name = name
self.log = logging.getLogger(self.name)
# Load info of the likelihood
for k in info:
setattr(self, k, info[k])
# Store the external function and its arguments
self.external_function = get_external_function(info[_external], name=self.name)
argspec = getargspec(self.external_function)
self.input_params = odict(
[(p, None) for p in argspec.args
if p not in ["_derived", "_theory"] and p in parameterization.input_params()])
self.has_derived = "_derived" in argspec.args
if self.has_derived:
derived_kw_index = argspec.args[-len(argspec.defaults):].index("_derived")
self.output_params = argspec.defaults[derived_kw_index]
else:
self.output_params = []
self.has_theory = "_theory" in argspec.args
if self.has_theory:
theory_kw_index = argspec.args[-len(argspec.defaults):].index("_theory")
self.needs = argspec.defaults[theory_kw_index]
# Timing
self.timing = timing
self.n = 0
self.time_avg = 0
# States, to avoid recomputing
self.n_states = 3
self.states = [{"params": None, "logp": None, "derived": None, "last": 0}
for _ in range(self.n_states)]
def __init__(self, info, name, timing=None):
Theory.__init__(self, info, name=name, timing=timing, standalone=False)
# Store the external function and assign its arguments
self.external_function = get_external_function(info[_external],
name=name)
self._self_arg = "_self"
argspec = getfullargspec(self.external_function)
if info.get(_input_params, []):
setattr(self, _input_params, str_to_list(info.get(_input_params)))
else:
ignore_args = [self._self_arg]
# MARKED FOR DEPRECATION IN v3.0
ignore_args += ["_derived", "_theory"]
# END OF DEPRECATION BLOCK
setattr(self, _input_params,
[p for p in argspec.args if p not in ignore_args])
# MARKED FOR DEPRECATION IN v3.0
self._derived_through_arg = "_derived" in argspec.args
# END OF DEPRECATION BLOCK
if info.get(_output_params, []):
setattr(self, _output_params,
str_to_list(info.get(_output_params)))
# MARKED FOR DEPRECATION IN v3.0
elif self._derived_through_arg:
self.log.warning(
"The use of a `_derived` argument to deal with derived parameters will be"
" deprecated in a future version. From now on please list your derived "
"parameters in a list as the value of %r in the likelihood info (see "
"documentation) and have your function return a tuple "
"`(logp, {derived_param_1: value_1, ...})`.", _output_params)
# BEHAVIOUR TO BE REPLACED BY ERROR:
derived_kw_index = argspec.args[-len(argspec.defaults):].index(
"_derived")
setattr(self, _output_params, argspec.defaults[derived_kw_index])
# END OF DEPRECATION BLOCK
else:
setattr(self, _output_params, [])
# Required quantities from other components
self._uses_self_arg = self._self_arg in argspec.args
if info.get(_requires) and not self._uses_self_arg:
raise LoggedError(
self.log,
"If a likelihood has external requirements, declared under %r, "
"it needs to accept a keyword argument %r.", _requires,
self._self_arg)
# MARKED FOR DEPRECATION IN v3.0
self._uses_old_theory = "_theory" in argspec.args
if self._uses_old_theory:
self.log.warning(
"The use of a `_theory` argument to deal with requirements will be"
" deprecated in a future version. From now on please indicate your "
"requirements as the value of field %r in the likelihood info (see "
"documentation) and have your function take a parameter `_self`.",
_requires)
# BEHAVIOUR TO BE REPLACED BY ERROR:
info[_requires] = argspec.defaults[
argspec.args[-len(argspec.defaults):].index("_theory")]
# END OF DEPRECATION BLOCK
self._requirements = info.get(_requires, {}) or {}
self.log.info("Initialized external likelihood.")
def __init__(self, info, name, timing=None):
Theory.__init__(self, info, name=name, timing=timing, standalone=False)
# Store the external function and assign its arguments
self.external_function = get_external_function(info["external"],
name=name)
self._self_arg = "_self"
argspec = getfullargspec(self.external_function)
self.input_params = str_to_list(self.input_params)
ignore_args = [self._self_arg]
if argspec.defaults:
required_args = argspec.args[:-len(argspec.defaults)]
else:
required_args = argspec.args
self.params = {p: None for p in required_args if p not in ignore_args}
# MARKED FOR DEPRECATION IN v3.0
if "_derived" in argspec.args:
raise LoggedError(
self.log,
"The use of a `_derived` argument to deal with derived "
"parameters has been deprecated. From now on please list your "
"derived parameters in a list as the value of %r in the "
"likelihood info (see documentation) and have your function "
"return a tuple `(logp, {derived_param_1: value_1, ...})`.",
"output_params")
# END OF DEPRECATION BLOCK
if self.output_params:
self.output_params = str_to_list(self.output_params) or []
# Required quantities from other components
self._uses_self_arg = self._self_arg in argspec.args
if info.get("requires") and not self._uses_self_arg:
raise LoggedError(
self.log,
"If a likelihood has external requirements, declared under %r, "
"it needs to accept a keyword argument %r.", "requires",
self._self_arg)
self._requirements = info.get("requires") or {}
# MARKED FOR DEPRECATION IN v3.0
if "_theory" in argspec.args:
raise LoggedError(
self.log,
"The use of a `_theory` argument to deal with requirements has "
"been deprecated. From now on please indicate your requirements"
" as the value of field %r in the likelihood info (see "
"documentation) and have your function take a parameter "
"`_self`.", "requires")
# END OF DEPRECATION BLOCK
self._optional_args = \
[p for p, val in chain(zip(argspec.args[-len(argspec.defaults):],
argspec.defaults) if argspec.defaults else [],
(argspec.kwonlydefaults or {}).items())
if p not in ignore_args and
(isinstance(val, numbers.Number) or val is None)]
self._args = set(chain(self._optional_args, self.params))
if argspec.varkw:
self._args.update(self.input_params)
self.log.info("Initialized external likelihood.")
def test_parameterization():
updated_info, products = run(info)
sample = products["sample"]
from getdist.mcsamples import loadCobayaSamples
gdsample = loadCobayaSamples(updated_info, products["sample"])
for i, point in sample:
a = info[_params]["a"]
b = get_external_function(info[_params]["b"])(a, point["bprime"])
c = get_external_function(info[_params]["c"])(a, point["cprime"])
e = get_external_function(e_func)(b)
f = get_external_function(f_func)(b)
g = get_external_function(info[_params]["g"]["derived"])(x_func(
point["c"]))
assert np.allclose(point[["b", "c", "e", "f", "g"]], [b, c, e, f, g])
bcefg_getdist = [
gdsample.samples[i][gdsample.paramNames.list().index(p)]
for p in ["b", "c", "e", "f", "g"]
]
assert np.allclose(bcefg_getdist, [b, c, e, f, g])
def __init__(self, name, info, parametrization, theory=None):
self.name = name
# Load info of the likelihood
for k in info:
setattr(self, k, info[k])
# Store the external function and its arguments
self.external_function = get_external_function(info[_external],
name=self.name)
argspec = inspect.getargspec(self.external_function)
self.input_params = odict([(p, None) for p in argspec.args
if p not in ["derived", "theory"]
and p in parametrization.input_params()])
self.has_derived = "derived" in argspec.args
if self.has_derived:
derived_kw_index = argspec.args[-len(argspec.defaults):].index(
"derived")
self.output_params = argspec.defaults[derived_kw_index]
else:
self.output_params = []
self.has_theory = "theory" in argspec.args
if self.has_theory:
theory_kw_index = argspec.args[-len(argspec.defaults):].index(
"theory")
self.needs = argspec.defaults[theory_kw_index]
def initialize(self):
"""Initializes the sampler:
creates the proposal distribution and draws the initial sample."""
self.log.debug("Initializing")
for p in [
"burn_in", "max_tries", "output_every", "check_every",
"callback_every"
]:
setattr(
self, p,
read_dnumber(getattr(self, p), self.model.prior.d(),
dtype=int))
if self.callback_every is None:
self.callback_every = self.check_every
# Burning-in countdown -- the +1 accounts for the initial point (always accepted)
self.burn_in_left = self.burn_in + 1
# Max # checkpoints to wait, in case one process dies without sending MPI_ABORT
self.been_waiting = 0
self.max_waiting = max(50, self.max_tries / self.model.prior.d())
if self.resuming and (max(self.mpi_size or 0, 1) != max(
get_mpi_size(), 1)):
self.log.error(
"Cannot resume a sample with a different number of chains: "
"was %d and now is %d.", max(self.mpi_size, 1),
max(get_mpi_size(), 1))
raise HandledException
if not self.resuming and self.output:
# Delete previous files (if not "forced", the run would have already failed)
if ((os.path.abspath(self.covmat_filename()) != os.path.abspath(
str(self.covmat)))):
try:
os.remove(self.covmat_filename())
except OSError:
pass
# There may be more that chains than expected,
# if #ranks was bigger in a previous run
i = 0
while True:
i += 1
collection_filename, _ = self.output.prepare_collection(str(i))
try:
os.remove(collection_filename)
except OSError:
break
# One collection per MPI process: `name` is the MPI rank + 1
name = str(1 + (lambda r: r if r is not None else 0)(get_mpi_rank()))
self.collection = Collection(self.model,
self.output,
name=name,
resuming=self.resuming)
self.current_point = OnePoint(self.model, OutputDummy({}), name=name)
# Use standard MH steps by default
self.get_new_sample = self.get_new_sample_metropolis
# Prepare oversampling / dragging if applicable
self.effective_max_samples = self.max_samples
if self.oversample and self.drag:
self.log.error("Choose either oversampling or dragging, not both.")
raise HandledException
if self.oversample:
factors, blocks = self.model.likelihood._speeds_of_params(
int_speeds=True)
self.oversampling_factors = factors
self.log.info("Oversampling with factors:\n" + "\n".join([
" %d : %r" % (f, b)
for f, b in zip(self.oversampling_factors, blocks)
]))
self.i_last_slow_block = None
# No way right now to separate slow and fast
slow_params = list(self.model.parameterization.sampled_params())
elif self.drag:
speeds, blocks = self.model.likelihood._speeds_of_params(
fast_slow=True, int_speeds=True)
# For now, no blocking inside either fast or slow: just 2 blocks
self.i_last_slow_block = 0
if np.all(speeds == speeds[0]):
self.log.error(
"All speeds are equal or too similar: cannot drag! "
"Make sure to define accurate likelihoods' speeds.")
raise HandledException
# Make the 1st factor 1:
speeds = [1, speeds[1] / speeds[0]]
# Target: dragging step taking as long as slow step
self.drag_interp_steps = self.drag * speeds[1]
# Per dragging step, the (fast) posterior is evaluated *twice*,
self.drag_interp_steps /= 2
self.drag_interp_steps = int(np.round(self.drag_interp_steps))
fast_params = list(chain(*blocks[1 + self.i_last_slow_block:]))
# Not too much or too little dragging
drag_limits = [(int(l) * len(fast_params) if l is not None else l)
for l in self.drag_limits]
if drag_limits[
0] is not None and self.drag_interp_steps < drag_limits[0]:
self.log.warning(
"Number of dragging steps clipped from below: was not "
"enough to efficiently explore the fast directions -- "
"avoid this limit by decreasing 'drag_limits[0]'.")
self.drag_interp_steps = drag_limits[0]
if drag_limits[
1] is not None and self.drag_interp_steps > drag_limits[1]:
self.log.warning(
"Number of dragging steps clipped from above: "
"excessive, probably inefficient, exploration of the "
"fast directions -- "
"avoid this limit by increasing 'drag_limits[1]'.")
self.drag_interp_steps = drag_limits[1]
# Re-scale steps between checkpoint and callback to the slow dimensions only
slow_params = list(chain(*blocks[:1 + self.i_last_slow_block]))
self.n_slow = len(slow_params)
for p in ["check_every", "callback_every"]:
setattr(
self, p,
int(getattr(self, p) * self.n_slow / self.model.prior.d()))
self.log.info("Dragging with oversampling per step:\n" +
"\n".join([
" %d : %r" % (f, b)
for f, b in zip([1, self.drag_interp_steps],
[blocks[0], fast_params])
]))
self.get_new_sample = self.get_new_sample_dragging
else:
_, blocks = self.model.likelihood._speeds_of_params()
self.oversampling_factors = [1 for b in blocks]
slow_params = list(self.model.parameterization.sampled_params())
self.n_slow = len(slow_params)
# Turn parameter names into indices
self.blocks = [[
list(self.model.parameterization.sampled_params()).index(p)
for p in b
] for b in blocks]
self.proposer = BlockedProposer(
self.blocks,
oversampling_factors=self.oversampling_factors,
i_last_slow_block=self.i_last_slow_block,
proposal_scale=self.proposal_scale)
# Build the initial covariance matrix of the proposal, or load from checkpoint
if self.resuming:
covmat = np.loadtxt(self.covmat_filename())
self.log.info("Covariance matrix from checkpoint.")
else:
covmat = self.initial_proposal_covmat(slow_params=slow_params)
self.log.info("Initial covariance matrix.")
self.log.debug(
"Sampling with covmat:\n%s",
DataFrame(
covmat,
columns=self.model.parameterization.sampled_params(),
index=self.model.parameterization.sampled_params()).to_string(
line_width=_line_width))
self.proposer.set_covariance(covmat)
# Prepare callback function
if self.callback_function is not None:
self.callback_function_callable = (get_external_function(
self.callback_function))
def initialize(self):
"""Initializes the sampler:
creates the proposal distribution and draws the initial sample."""
if not self.model.prior.d():
raise LoggedError(self.log,
"No parameters being varied for sampler")
self.log.debug("Initializing")
# MARKED FOR DEPRECATION IN v3.0
if getattr(self, "oversample", None) is not None:
self.log.warning(
"*DEPRECATION*: `oversample` will be deprecated in the "
"next version. Oversampling is now requested by setting "
"`oversample_power` > 0.")
# END OF DEPRECATION BLOCK
# MARKED FOR DEPRECATION IN v3.0
if getattr(self, "check_every", None) is not None:
self.log.warning(
"*DEPRECATION*: `check_every` will be deprecated in the "
"next version. Please use `learn_every` instead.")
# BEHAVIOUR TO BE REPLACED BY ERROR:
self.learn_every = getattr(self, "check_every")
# END OF DEPRECATION BLOCK
if self.callback_every is None:
self.callback_every = self.learn_every
self._quants_d_units = []
for q in ["max_tries", "learn_every", "callback_every", "burn_in"]:
number = NumberWithUnits(getattr(self, q), "d", dtype=int)
self._quants_d_units.append(number)
setattr(self, q, number)
self.output_every = NumberWithUnits(self.output_every, "s", dtype=int)
if is_main_process():
if self.output.is_resuming() and (max(self.mpi_size or 0, 1) !=
max(get_mpi_size(), 1)):
raise LoggedError(
self.log,
"Cannot resume a run with a different number of chains: "
"was %d and now is %d.", max(self.mpi_size, 1),
max(get_mpi_size(), 1))
if more_than_one_process():
if get_mpi().Get_version()[0] < 3:
raise LoggedError(
self.log, "MPI use requires MPI version 3.0 or "
"higher to support IALLGATHER.")
sync_processes()
# One collection per MPI process: `name` is the MPI rank + 1
name = str(1 + (lambda r: r if r is not None else 0)(get_mpi_rank()))
self.collection = Collection(self.model,
self.output,
name=name,
resuming=self.output.is_resuming())
self.current_point = OneSamplePoint(self.model)
# Use standard MH steps by default
self.get_new_sample = self.get_new_sample_metropolis
# Prepare callback function
if self.callback_function is not None:
self.callback_function_callable = (get_external_function(
self.callback_function))
# Useful for getting last points added inside callback function
self.last_point_callback = 0
# Monitoring/restore progress
if is_main_process():
cols = [
"N", "timestamp", "acceptance_rate", "Rminus1", "Rminus1_cl"
]
self.progress = DataFrame(columns=cols)
self.i_learn = 1
if self.output and not self.output.is_resuming():
with open(self.progress_filename(), "w",
encoding="utf-8") as progress_file:
progress_file.write("# " +
" ".join(self.progress.columns) + "\n")
# Get first point, to be discarded -- not possible to determine its weight
# Still, we need to compute derived parameters, since, as the proposal "blocked",
# we may be saving the initial state of some block.
# NB: if resuming but nothing was written (burn-in not finished): re-start
if self.output.is_resuming() and len(self.collection):
initial_point = (self.collection[
self.collection.sampled_params].iloc[len(self.collection) -
1]).values.copy()
logpost = -(self.collection[_minuslogpost].iloc[
len(self.collection) - 1].copy())
logpriors = -(self.collection[self.collection.minuslogprior_names].
iloc[len(self.collection) - 1].copy())
loglikes = -0.5 * (self.collection[self.collection.chi2_names].
iloc[len(self.collection) - 1].copy())
derived = (self.collection[self.collection.derived_params].iloc[
len(self.collection) - 1].values.copy())
else:
# NB: max_tries adjusted to dim instead of #cycles (blocking not computed yet)
self.max_tries.set_scale(self.model.prior.d())
self.log.info(
"Getting initial point... (this may take a few seconds)")
initial_point, logpost, logpriors, loglikes, derived = \
self.model.get_valid_point(max_tries=self.max_tries.value)
# If resuming but no existing chain, assume failed run and ignore blocking
# if speeds measurement requested
if self.output.is_resuming() and not len(self.collection) \
and self.measure_speeds:
self.blocking = None
if self.measure_speeds and self.blocking:
self.log.warning(
"Parameter blocking manually fixed: speeds will not be measured."
)
elif self.measure_speeds:
n = None if self.measure_speeds is True else int(
self.measure_speeds)
self.model.measure_and_set_speeds(n=n, discard=0)
self.set_proposer_blocking()
self.set_proposer_covmat(load=True)
self.current_point.add(initial_point,
derived=derived,
logpost=logpost,
logpriors=logpriors,
loglikes=loglikes)
self.log.info("Initial point: %s", self.current_point)
# Max #(learn+convergence checks) to wait,
# in case one process dies without sending MPI_ABORT
self.been_waiting = 0
self.max_waiting = max(50, self.max_tries.unit_value)
# Burning-in countdown -- the +1 accounts for the initial point (always accepted)
self.burn_in_left = self.burn_in.value * self.current_point.output_thin + 1
# Initial dummy checkpoint
# (needed when 1st "learn point" not reached in prev. run)
self.write_checkpoint()
def initialize(self):
"""Initializes the sampler:
creates the proposal distribution and draws the initial sample."""
if not self.model.prior.d():
raise LoggedError(self.log,
"No parameters being varied for sampler")
self.log.debug("Initializing")
# MARKED FOR DEPRECATION IN v3.0
if getattr(self, "oversample", None) is not None:
raise LoggedError(
self.log, "`oversample` has been deprecated. "
"Oversampling is now requested by setting "
"`oversample_power` > 0.")
# END OF DEPRECATION BLOCK
# MARKED FOR DEPRECATION IN v3.0
if getattr(self, "check_every", None) is not None:
raise LoggedError(
self.log, "`check_every` has been deprecated. "
"Please use `learn_every` instead.")
# END OF DEPRECATION BLOCK
if self.callback_every is None:
self.callback_every = self.learn_every
self._quants_d_units = []
for q in ["max_tries", "learn_every", "callback_every", "burn_in"]:
number = NumberWithUnits(getattr(self, q), "d", dtype=int)
self._quants_d_units.append(number)
setattr(self, q, number)
self.output_every = NumberWithUnits(self.output_every, "s", dtype=int)
if is_main_process():
if self.output.is_resuming() and (max(self.mpi_size or 0, 1) !=
mpi.size()):
raise LoggedError(
self.log,
"Cannot resume a run with a different number of chains: "
"was %d and now is %d.", max(self.mpi_size or 0, 1),
mpi.size())
sync_processes()
# One collection per MPI process: `name` is the MPI rank + 1
name = str(1 + mpi.rank())
self.collection = SampleCollection(self.model,
self.output,
name=name,
resuming=self.output.is_resuming())
self.current_point = OneSamplePoint(self.model)
# Use standard MH steps by default
self.get_new_sample = self.get_new_sample_metropolis
# Prepare callback function
if self.callback_function:
self.callback_function_callable = (get_external_function(
self.callback_function))
# Useful for getting last points added inside callback function
self.last_point_callback = 0
self.i_learn = 1
# Monitoring/restore progress
if is_main_process():
cols = [
"N", "timestamp", "acceptance_rate", "Rminus1", "Rminus1_cl"
]
self.progress = DataFrame(columns=cols)
if self.output and not self.output.is_resuming():
header_fmt = {
"N": 6 * " " + "N",
"timestamp": 17 * " " + "timestamp"
}
with open(self.progress_filename(), "w",
encoding="utf-8") as progress_file:
progress_file.write("# " + " ".join([
header_fmt.get(col, ((7 + 8) - len(col)) * " " + col)
for col in self.progress.columns
]) + "\n")
# Get first point, to be discarded -- not possible to determine its weight
# Still, we need to compute derived parameters, since, as the proposal "blocked",
# we may be saving the initial state of some block.
# NB: if resuming but nothing was written (burn-in not finished): re-start
if self.output.is_resuming() and len(self.collection):
last = len(self.collection) - 1
initial_point = (self.collection[
self.collection.sampled_params].iloc[last]).to_numpy(
dtype=np.float64, copy=True)
results = LogPosterior(
logpost=-self.collection[OutPar.minuslogpost].iloc[last],
logpriors=-(self.collection[
self.collection.minuslogprior_names].iloc[last].to_numpy(
dtype=np.float64, copy=True)),
loglikes=-0.5 *
(self.collection[self.collection.chi2_names].iloc[last].
to_numpy(dtype=np.float64, copy=True)),
derived=(self.collection[
self.collection.derived_params].iloc[last].to_numpy(
dtype=np.float64, copy=True)))
else:
# NB: max_tries adjusted to dim instead of #cycles (blocking not computed yet)
self.max_tries.set_scale(self.model.prior.d())
self.log.info(
"Getting initial point... (this may take a few seconds)")
initial_point, results = \
self.model.get_valid_point(max_tries=self.max_tries.value,
random_state=self._rng)
# If resuming but no existing chain, assume failed run and ignore blocking
# if speeds measurement requested
if self.output.is_resuming() and not len(self.collection) \
and self.measure_speeds:
self.blocking = None
if self.measure_speeds and self.blocking:
self.mpi_warning(
"Parameter blocking manually fixed: speeds will not be measured."
)
elif self.measure_speeds:
n = None if self.measure_speeds is True else int(
self.measure_speeds)
self.model.measure_and_set_speeds(n=n,
discard=0,
random_state=self._rng)
self.set_proposer_blocking()
self.set_proposer_initial_covmat(load=True)
self.current_point.add(initial_point, results)
self.log.info("Initial point: %s", self.current_point)
# Max #(learn+convergence checks) to wait,
# in case one process dies/hangs without raising error
self.been_waiting = 0
self.max_waiting = max(50, self.max_tries.unit_value)
# Burning-in countdown -- the +1 accounts for the initial point (always accepted)
self.burn_in_left = self.burn_in.value * self.current_point.output_thin + 1
self._msg_ready = ("Ready to check convergence" +
(" and learn a new proposal covmat"
if self.learn_proposal else ""))
# Initial dummy checkpoint
# (needed when 1st "learn point" not reached in prev. run)
self.write_checkpoint()
def __init__(self, parameterization, info_prior=None):
"""
Initializes the prior and reference pdf's from the input information.
"""
constant_params_info = parameterization.constant_params()
sampled_params_info = parameterization.sampled_params_info()
if not sampled_params_info:
log.warning("No sampled parameters requested! "
"This will fail for non-mock samplers.")
# pdf: a list of independent components
# in principle, separable: one per parameter
self.name = []
self.pdf = []
self.ref_pdf = []
self._bounds = np.zeros((len(sampled_params_info), 2))
for i, p in enumerate(sampled_params_info):
self.name += [p]
prior = sampled_params_info[p].get(_prior)
self.pdf += [get_scipy_1d_pdf({p: prior})]
fast_logpdf = fast_logpdfs.get(self.pdf[-1].dist.name)
if fast_logpdf:
self.pdf[-1].logpdf = MethodType(fast_logpdf, self.pdf[-1])
# Get the reference (1d) pdf
ref = sampled_params_info[p].get(_p_ref)
# Cases: number, pdf (something, but not a number), nothing
if isinstance(ref, numbers.Number):
self.ref_pdf += [float(ref)]
elif ref is not None:
self.ref_pdf += [get_scipy_1d_pdf({p: ref})]
else:
self.ref_pdf += [np.nan]
self._bounds[i] = [-np.inf, np.inf]
try:
self._bounds[i] = self.pdf[-1].interval(1)
except AttributeError:
log.error(
"No bounds defined for parameter '%s' "
"(maybe not a scipy 1d pdf).", p)
raise HandledException
# Process the external prior(s):
self.external = odict()
for name in (info_prior if info_prior else {}):
if name == _prior_1d_name:
log.error(
"The name '%s' is a reserved prior name. "
"Please use a different one.", _prior_1d_name)
raise HandledException
log.debug("Loading external prior '%s' from: '%s'", name,
info_prior[name])
self.external[name] = ({
"logp":
get_external_function(info_prior[name], name=name)
})
self.external[name]["argspec"] = (getargspec(
self.external[name]["logp"]))
self.external[name]["params"] = {
p: list(sampled_params_info).index(p)
for p in self.external[name]["argspec"].args
if p in sampled_params_info
}
self.external[name]["constant_params"] = {
p: constant_params_info[p]
for p in self.external[name]["argspec"].args
if p in constant_params_info
}
if (not (len(self.external[name]["params"]) +
len(self.external[name]["constant_params"]))):
log.error(
"None of the arguments of the external prior '%s' "
"are known *fixed* or *sampled* parameters. "
"This prior recognizes: %r", name,
self.external[name]["argspec"].args)
raise HandledException
params_without_default = self.external[name]["argspec"].args[:(
len(self.external[name]["argspec"].args) -
len(self.external[name]["argspec"].defaults or []))]
if not all([(p in self.external[name]["params"]
or p in self.external[name]["constant_params"])
for p in params_without_default]):
log.error(
"Some of the arguments of the external prior '%s' "
"cannot be found and don't have a default value either: %s",
name,
list(
set(params_without_default).difference(
self.external[name]["params"]).difference(
self.external[name]["constant_params"])))
raise HandledException
log.warning(
"External prior '%s' loaded. "
"Mind that it might not be normalized!", name)
def __init__(self,
parameterization: Parameterization,
info_prior: Optional[PriorsDict] = None):
"""
Initializes the prior and reference pdf's from the input information.
"""
self.set_logger()
self._parameterization = parameterization
sampled_params_info = parameterization.sampled_params_info()
# pdf: a list of independent components
# in principle, separable: one per parameter
self.params = []
self.pdf = []
self._bounds = np.zeros((len(sampled_params_info), 2))
for i, p in enumerate(sampled_params_info):
self.params += [p]
prior = sampled_params_info[p].get("prior")
self.pdf += [get_scipy_1d_pdf({p: prior})]
fast_logpdf = fast_logpdfs.get(self.pdf[-1].dist.name)
if fast_logpdf:
self.pdf[-1].logpdf = MethodType(fast_logpdf, self.pdf[-1])
self._bounds[i] = [-np.inf, np.inf]
try:
self._bounds[i] = self.pdf[-1].interval(1)
except AttributeError:
raise LoggedError(
self.log, "No bounds defined for parameter '%s' "
"(maybe not a scipy 1d pdf).", p)
self._uniform_indices = np.array([
i for i, pdf in enumerate(self.pdf) if pdf.dist.name == 'uniform'
],
dtype=int)
self._non_uniform_indices = np.array([
i for i in range(len(self.pdf)) if i not in self._uniform_indices
],
dtype=int)
self._non_uniform_logpdf = [
self.pdf[i].logpdf for i in self._non_uniform_indices
]
self._upper_limits = self._bounds[:, 1].copy()
self._lower_limits = self._bounds[:, 0].copy()
self._uniform_logp = -np.sum(
np.log(self._upper_limits[self._uniform_indices] -
self._lower_limits[self._uniform_indices]))
# Set the reference pdf's
self.set_reference(
{p: v.get("ref")
for p, v in sampled_params_info.items()})
# Process the external prior(s):
self.external = {}
self.external_dependence = set()
info_prior = info_prior or {}
for name in info_prior:
if name == prior_1d_name:
raise LoggedError(
self.log, "The name '%s' is a reserved prior name. "
"Please use a different one.", prior_1d_name)
self.log.debug("Loading external prior '%s' from: '%s'", name,
info_prior[name])
logp = get_external_function(info_prior[name], name=name)
argspec = getfullargspec(logp)
known = set(parameterization.input_params())
params = [p for p in argspec.args if p in known]
params_without_default = set(
argspec.args[:(len(argspec.args) -
len(argspec.defaults or []))])
unknown = params_without_default - known
if unknown:
if unknown.intersection(parameterization.derived_params()):
err = (
"External prior '%s' has arguments %s that are output derived "
"parameters, Priors must be functions of input parameters. "
"Use a separate 'likelihood' for the prior if needed.")
else:
err = (
"Some of the arguments of the external prior '%s' cannot be "
"found and don't have a default value either: %s")
raise LoggedError(self.log, err, name, list(unknown))
self.external_dependence.update(params)
self.external[name] = ExternalPrior(logp=logp, params=params)
self.mpi_warning(
"External prior '%s' loaded. "
"Mind that it might not be normalized!", name)
parameterization.check_dropped(self.external_dependence)
def __init__(self,
info_params: Union[ParamsDict, ExpandedParamsDict],
allow_renames=True,
ignore_unused_sampled=False):
self.set_logger()
self.allow_renames = allow_renames
# First, we load the parameters,
# not caring about whether they are understood by any likelihood.
# `input` contains the parameters (expected to be) understood by the likelihood,
# with its fixed value, its fixing function, or None if their value is given
# directly by the sampler.
self._infos = {}
self._input: ParamValuesDict = {}
self._input_funcs = {}
self._input_args = {}
self._input_dependencies: Dict[str, Set[str]] = {}
self._dropped: Set[str] = set()
self._output: ParamValuesDict = {}
self._constant: ParamValuesDict = {}
self._sampled: ParamValuesDict = {}
self._sampled_renames: Dict[str, List[str]] = {}
self._derived: ParamValuesDict = {}
self._derived_inputs = []
self._derived_funcs = {}
self._derived_args = {}
self._derived_dependencies: Dict[str, Set[str]] = {}
# Notice here that expand_info_param *always* adds a "derived":True tag
# to infos without "prior" or "value", and a "value" field
# to fixed params
for p, info in info_params.items():
if isinstance(info, Mapping) and not set(info).issubset(partags):
raise LoggedError(self.log,
"Parameter '%s' has unknown options %s", p,
set(info).difference(partags))
info = expand_info_param(info)
self._infos[p] = info
if is_fixed_or_function_param(info):
if isinstance(info["value"], Real):
self._constant[p] = float(info["value"])
self._input[p] = self._constant[p]
if info.get("drop"):
self._dropped.add(p)
else:
self._input[p] = np.nan
self._input_funcs[p] = get_external_function(info["value"])
self._input_args[p] = getfullargspec(
self._input_funcs[p]).args
if is_sampled_param(info):
self._sampled[p] = np.nan
self._input[p] = np.nan
if info.get("drop"):
self._dropped.add(p)
self._sampled_renames[p] = str_to_list(
info.get("renames") or [])
if is_derived_param(info):
self._derived[p] = np.nan
# Dynamical parameters whose value we want to save
if info["derived"] is True and is_fixed_or_function_param(
info):
# parameters that are already known or computed by input funcs
self._derived_inputs.append(p)
elif info["derived"] is True:
self._output[p] = np.nan
else:
self._derived_funcs[p] = get_external_function(
info["derived"])
self._derived_args[p] = getfullargspec(
self._derived_funcs[p]).args
# Check that the sampled and derived params are all valid python variable names
for p in chain(self._sampled, self._derived):
if not is_valid_variable_name(p):
is_in = p in self._sampled
eg_in = " p_prime:\n prior: ...\n %s: " \
"'lambda p_prime: p_prime'\n" % p
eg_out = " p_prime: 'lambda %s: %s'\n" % (p, p)
raise LoggedError(
self.log,
"Parameter name '%s' is not a valid Python variable name "
"(it needs to start with a letter or '_').\n"
"If this is an %s parameter of a likelihood or theory, "
"whose name you cannot change,%s define an associated "
"%s one with a valid name 'p_prime' as: \n\n%s", p,
"input" if is_in else "output",
"" if is_in else " remove it and",
"sampled" if is_in else "derived",
eg_in if is_in else eg_out)
# input params depend on input and sampled only,
# never on output/derived unless constant
known_input = set(self._input)
all_input_arguments = set(chain(*self._input_args.values()))
bad_input_dependencies = all_input_arguments - known_input
if bad_input_dependencies:
raise LoggedError(
self.log,
"Input parameters defined as functions can only depend on other "
"input parameters. In particular, an input parameter cannot depend on %r."
" Use an explicit Theory calculator for more complex dependencies.\n"
"If you intended to define a derived output parameter use derived: "
"instead of value:", list(bad_input_dependencies))
# Assume that the *un*known function arguments are likelihood/theory
# output parameters
for arg in (all_input_arguments.union(*self._derived_args.values()).
difference(known_input).difference(self._derived)):
self._output[arg] = np.nan
# Useful set: directly "output-ed" derived
self._directly_output = [p for p in self._derived if p in self._output]
self._wrapped_input_funcs, self._wrapped_derived_funcs = \
self._get_wrapped_functions_evaluation_order()
# Useful mapping: input params that vary if each sample is varied
self._sampled_input_dependence = {
s: [
i for i in self._input
if s in self._input_dependencies.get(i, {})
]
for s in self._sampled
}
# From here on, some error control.
# Only actually raise error after checking if used by prior.
if not ignore_unused_sampled:
self._dropped_not_directly_used = self._dropped.intersection(
p for p, v in self._sampled_input_dependence.items() if not v)
else:
self._dropped_not_directly_used = set()
# warn if repeated labels
labels_inv_repeated = invert_dict(self.labels())
labels_inv_repeated = {
k: v
for k, v in labels_inv_repeated.items() if len(v) > 1
}
if labels_inv_repeated:
self.log.warning("There are repeated parameter labels: %r",
labels_inv_repeated)
def __init__(self, info_params):
# First, we load the parameters,
# not caring about whether they are understood by any likelihood.
# `input` contains the parameters (expected to be) understood by the likelihood,
# with its fixed value, its fixing function, or None if their value is given
# directly by the sampler.
self._input = odict()
self._input_funcs = dict()
self._input_args = dict()
self._output = odict()
self._fixed = odict()
self._sampled = odict()
self._derived = odict()
self._derived_funcs = dict()
self._derived_args = dict()
for p, info in info_params.items():
if is_fixed_param(info):
self._input[p] = float(info) if isinstance(info, Number) else None
if self._input[p] is None:
self._input_funcs[p] = get_external_function(info)
self._input_args[p] = getargspec(self._input_funcs[p]).args
else:
self._fixed[p] = self._input[p]
if is_sampled_param(info):
self._sampled[p] = info
if not info.get(_p_drop, False):
self._input[p] = None
if is_derived_param(info):
self._derived[p] = info
if _p_derived in (info or {}):
self._derived_funcs[p] = get_external_function(info[_p_derived])
self._derived_args[p] = getargspec(self._derived_funcs[p]).args
else:
self._output[p] = None
# Check that the sampled and derived params are all valid python variable names
def valid(name):
try:
parse("%s=None"%name)
return True
except SyntaxError:
return False
for p in chain(self.sampled_params(),self.derived_params()):
if not valid(p):
is_in = p in self.sampled_params()
eg_in = " p_prime:\n prior: ...\n %s: 'lambda p_prime: p_prime'\n"%p
eg_out = " p_prime: 'lambda %s: %s'\n"%(p,p)
log.error("Parameter name '%s' is not a valid Python variable name "
"(it needs to start with a letter or '_').\n"
"If this is an %s parameter of a likelihood or theory, "
"whose name you cannot change,%s define an associated "
"%s one with a valid name 'p_prime' as: \n\n%s",
p, "input" if is_in else "output",
"" if is_in else " remove it and",
"sampled" if is_in else "derived",
eg_in if is_in else eg_out)
raise HandledException
# Assume that the *un*known function arguments are likelihood output parameters
args = (set(chain(*self._input_args.values()))
.union(chain(*self._derived_args.values())))
for p in list(self._input.keys()) + list(self._sampled.keys()) + list(self._output.keys()):
if p in args:
args.remove(p)
self._output.update({p:None for p in args})
# Useful sets: directly-sampled input parameters and directly "output-ed" derived
self._directly_sampled = [p for p in self._input if p in self._sampled]
self._directly_output = [p for p in self._derived if p in self._output]
# Useful mapping: input params that vary if each sampled is varied
self._sampled_input_dependence = odict(
[[s,[i for i in self._input if s in self._input_args.get(i, {})]]
for s in self._sampled])
# From here on, some error control.
dropped_but_never_used = (
set([p for p,v in self._sampled_input_dependence.items() if not v])
.difference(set(self._directly_sampled)))
if dropped_but_never_used:
log.error("Parameters %r are sampled but not passed to the likelihood or "
"theory code, neither ever used as arguments for any parameters. "
"Check that you are not using the '%s' tag unintentionally.",
list(dropped_but_never_used), _p_drop)
raise HandledException
# input params depend on input and sampled only, never on output/derived
bad_input_dependencies = set(chain(*self._input_args.values())).difference(
set(self.input_params()).union(set(self.sampled_params())))
if bad_input_dependencies:
log.error("Input parameters defined as functions can only depend on other "
"input parameters that are not defined as functions. "
"In particular, an input parameter cannot depend on %r",
list(bad_input_dependencies))
raise HandledException
# derived depend of input and output, never of sampled which are not input
bad_derived_dependencies = set(chain(*self._derived_args.values())).difference(
set(self.input_params()).union(set(self.output_params())))
if bad_derived_dependencies:
log.error("Derived parameters can only depend on input and output parameters,"
" never on sampled parameters that have been defined as a function."
" In particular, a derived parameter cannot depend on %r",
list(bad_derived_dependencies))
raise HandledException
def __init__(self,
parameterization: Parameterization,
info_prior: Optional[PriorsDict] = None):
"""
Initializes the prior and reference pdf's from the input information.
"""
self.set_logger()
self._parameterization = parameterization
sampled_params_info = parameterization.sampled_params_info()
# pdf: a list of independent components
# in principle, separable: one per parameter
self.params = []
self.pdf = []
self.ref_pdf = []
self._ref_is_pointlike = True
self._bounds = np.zeros((len(sampled_params_info), 2))
for i, p in enumerate(sampled_params_info):
self.params += [p]
prior = sampled_params_info[p].get("prior")
self.pdf += [get_scipy_1d_pdf({p: prior})]
fast_logpdf = fast_logpdfs.get(self.pdf[-1].dist.name)
if fast_logpdf:
self.pdf[-1].logpdf = MethodType(fast_logpdf, self.pdf[-1])
# Get the reference (1d) pdf
ref = sampled_params_info[p].get("ref")
# Cases: number, pdf (something, but not a number), nothing
if isinstance(ref, Sequence) and len(ref) == 2 and all(
isinstance(n, numbers.Number) for n in ref):
ref = {"dist": "norm", "loc": ref[0], "scale": ref[1]}
if isinstance(ref, numbers.Real):
self.ref_pdf += [float(ref)]
elif isinstance(ref, Mapping):
self.ref_pdf += [get_scipy_1d_pdf({p: ref})]
self._ref_is_pointlike = False
elif ref is None:
self.ref_pdf += [np.nan]
self._ref_is_pointlike = False
else:
raise LoggedError(
self.log,
"'ref' for starting position should be None or a number"
", a list of two numbers for normal mean and deviation,"
"or a dict with parameters for a scipy distribution.")
self._bounds[i] = [-np.inf, np.inf]
try:
self._bounds[i] = self.pdf[-1].interval(1)
except AttributeError:
raise LoggedError(
self.log, "No bounds defined for parameter '%s' "
"(maybe not a scipy 1d pdf).", p)
self._uniform_indices = np.array([
i for i, pdf in enumerate(self.pdf) if pdf.dist.name == 'uniform'
],
dtype=int)
self._non_uniform_indices = np.array([
i for i in range(len(self.pdf)) if i not in self._uniform_indices
],
dtype=int)
self._non_uniform_logpdf = [
self.pdf[i].logpdf for i in self._non_uniform_indices
]
self._upper_limits = self._bounds[:, 1].copy()
self._lower_limits = self._bounds[:, 0].copy()
self._uniform_logp = -np.sum(
np.log(self._upper_limits[self._uniform_indices] -
self._lower_limits[self._uniform_indices]))
# Process the external prior(s):
self.external = {}
self.external_dependence = set()
info_prior = info_prior or {}
for name in info_prior:
if name == prior_1d_name:
raise LoggedError(
self.log, "The name '%s' is a reserved prior name. "
"Please use a different one.", prior_1d_name)
self.log.debug("Loading external prior '%s' from: '%s'", name,
info_prior[name])
logp = get_external_function(info_prior[name], name=name)
argspec = getfullargspec(logp)
known = set(parameterization.input_params())
params = [p for p in argspec.args if p in known]
params_without_default = set(
argspec.args[:(len(argspec.args) -
len(argspec.defaults or []))])
unknown = params_without_default - known
if unknown:
if unknown.intersection(parameterization.derived_params()):
err = (
"External prior '%s' has arguments %s that are output derived "
"parameters, Priors must be functions of input parameters. "
"Use a separate 'likelihood' for the prior if needed.")
else:
err = (
"Some of the arguments of the external prior '%s' cannot be "
"found and don't have a default value either: %s")
raise LoggedError(self.log, err, name, list(unknown))
self.external_dependence.update(params)
self.external[name] = ExternalPrior(logp=logp, params=params)
self.mpi_warning(
"External prior '%s' loaded. "
"Mind that it might not be normalized!", name)
parameterization.check_dropped(self.external_dependence)
def __init__(self, parameterization, info_prior=None):
"""
Initializes the prior and reference pdf's from the input information.
"""
self.set_logger()
constant_params_info = parameterization.constant_params()
sampled_params_info = parameterization.sampled_params_info()
if not sampled_params_info:
self.mpi_warning("No sampled parameters requested! "
"This will fail for non-mock samplers.")
# pdf: a list of independent components
# in principle, separable: one per parameter
self.params = []
self.pdf = []
self.ref_pdf = []
self._ref_is_pointlike = True
self._bounds = np.zeros((len(sampled_params_info), 2))
for i, p in enumerate(sampled_params_info):
self.params += [p]
prior = sampled_params_info[p].get(_prior)
self.pdf += [get_scipy_1d_pdf({p: prior})]
fast_logpdf = fast_logpdfs.get(self.pdf[-1].dist.name)
if fast_logpdf:
self.pdf[-1].logpdf = MethodType(fast_logpdf, self.pdf[-1])
# Get the reference (1d) pdf
ref = sampled_params_info[p].get(partag.ref)
# Cases: number, pdf (something, but not a number), nothing
if isinstance(ref, numbers.Real):
self.ref_pdf += [float(ref)]
elif ref is not None:
self.ref_pdf += [get_scipy_1d_pdf({p: ref})]
self._ref_is_pointlike = False
else:
self.ref_pdf += [np.nan]
self._ref_is_pointlike = False
self._bounds[i] = [-np.inf, np.inf]
try:
self._bounds[i] = self.pdf[-1].interval(1)
except AttributeError:
raise LoggedError(
self.log, "No bounds defined for parameter '%s' "
"(maybe not a scipy 1d pdf).", p)
self._uniform_indices = np.array([
i for i, pdf in enumerate(self.pdf) if pdf.dist.name == 'uniform'
],
dtype=int)
self._non_uniform_indices = np.array([
i for i in range(len(self.pdf)) if i not in self._uniform_indices
],
dtype=int)
self._non_uniform_logpdf = [
self.pdf[i].logpdf for i in self._non_uniform_indices
]
self._upper_limits = self._bounds[:, 1].copy()
self._lower_limits = self._bounds[:, 0].copy()
self._uniform_logp = -np.sum(
np.log(self._upper_limits[self._uniform_indices] -
self._lower_limits[self._uniform_indices]))
# Process the external prior(s):
self.external = {}
for name in (info_prior if info_prior else {}):
if name == _prior_1d_name:
raise LoggedError(
self.log, "The name '%s' is a reserved prior name. "
"Please use a different one.", _prior_1d_name)
self.log.debug("Loading external prior '%s' from: '%s'", name,
info_prior[name])
opts = {"logp": get_external_function(info_prior[name], name=name)}
self.external[name] = opts
opts["argspec"] = (getfullargspec(opts["logp"]))
opts["params"] = {
p: list(sampled_params_info).index(p)
for p in opts["argspec"].args if p in sampled_params_info
}
opts["constant_params"] = {
p: constant_params_info[p]
for p in opts["argspec"].args if p in constant_params_info
}
if (not (len(opts["params"]) + len(opts["constant_params"]))):
raise LoggedError(
self.log,
"None of the arguments of the external prior '%s' "
"are known *fixed* or *sampled* parameters. "
"This prior recognizes: %r", name, opts["argspec"].args)
params_without_default = opts["argspec"].args[:(
len(opts["argspec"].args) -
len(opts["argspec"].defaults or []))]
if not all((p in opts["params"] or p in opts["constant_params"])
for p in params_without_default):
raise LoggedError(
self.log,
"Some of the arguments of the external prior '%s' cannot "
"be found and don't have a default value either: %s", name,
list(
set(params_without_default).difference(
opts["params"]).difference(
opts["constant_params"])))
self.mpi_warning(
"External prior '%s' loaded. "
"Mind that it might not be normalized!", name)
def __init__(self,
info_params,
allow_renames=True,
ignore_unused_sampled=False):
self.set_logger(lowercase=True)
self.allow_renames = allow_renames
# First, we load the parameters,
# not caring about whether they are understood by any likelihood.
# `input` contains the parameters (expected to be) understood by the likelihood,
# with its fixed value, its fixing function, or None if their value is given
# directly by the sampler.
self._infos = odict()
self._input = odict()
self._input_funcs = dict()
self._input_args = dict()
self._output = odict()
self._constant = odict()
self._sampled = odict()
self._sampled_renames = odict()
self._derived = odict()
self._derived_funcs = dict()
self._derived_args = dict()
# Notice here that expand_info_param *always* adds a _p_derived:True tag
# to infos without _prior or _p_value, and a _p_value field to fixed params
for p, info in info_params.items():
self._infos[p] = deepcopy(info)
if is_fixed_param(info):
if isinstance(info[_p_value], Number):
self._constant[p] = info[_p_value]
if not info.get(_p_drop, False):
self._input[p] = self._constant[p]
else:
self._input[p] = None
self._input_funcs[p] = get_external_function(
info[_p_value])
self._input_args[p] = getargspec(self._input_funcs[p]).args
if is_sampled_param(info):
self._sampled[p] = None
if not info.get(_p_drop, False):
self._input[p] = None
self._sampled_renames[p] = ((
lambda x: [x]
if isinstance(x, string_types) else x)(info.get(
_p_renames, [])))
if is_derived_param(info):
self._derived[p] = deepcopy(info)
# Dynamical parameters whose value we want to save
if info[_p_derived] is True and is_fixed_param(info):
info[_p_derived] = "lambda %s: %s" % (p, p)
if info[_p_derived] is True:
self._output[p] = None
else:
self._derived_funcs[p] = get_external_function(
info[_p_derived])
self._derived_args[p] = getargspec(
self._derived_funcs[p]).args
# Check that the sampled and derived params are all valid python variable names
for p in chain(self.sampled_params(), self.derived_params()):
if not is_valid_variable_name(p):
is_in = p in self.sampled_params()
eg_in = " p_prime:\n prior: ...\n %s: 'lambda p_prime: p_prime'\n" % p
eg_out = " p_prime: 'lambda %s: %s'\n" % (p, p)
raise LoggedError(
self.log,
"Parameter name '%s' is not a valid Python variable name "
"(it needs to start with a letter or '_').\n"
"If this is an %s parameter of a likelihood or theory, "
"whose name you cannot change,%s define an associated "
"%s one with a valid name 'p_prime' as: \n\n%s", p,
"input" if is_in else "output",
"" if is_in else " remove it and",
"sampled" if is_in else "derived",
eg_in if is_in else eg_out)
# Assume that the *un*known function arguments are likelihood output parameters
args = (set(chain(*self._input_args.values())).union(
chain(*self._derived_args.values())))
for p in (list(self._constant) + list(self._input) +
list(self._sampled) + list(self._derived)):
if p in args:
args.remove(p)
self._output.update({p: None for p in args})
# Useful sets: directly-sampled input parameters and directly "output-ed" derived
self._directly_sampled = [p for p in self._input if p in self._sampled]
self._directly_output = [p for p in self._derived if p in self._output]
# Useful mapping: input params that vary if each sampled is varied
self._sampled_input_dependence = odict(
[[s, [i for i in self._input if s in self._input_args.get(i, {})]]
for s in self._sampled])
# From here on, some error control.
dropped_but_never_used = (set([
p for p, v in self._sampled_input_dependence.items() if not v
]).difference(set(self._directly_sampled)))
if dropped_but_never_used and not ignore_unused_sampled:
raise LoggedError(
self.log,
"Parameters %r are sampled but not passed to the likelihood or theory "
"code, neither ever used as arguments for any parameters. "
"Check that you are not using the '%s' tag unintentionally.",
list(dropped_but_never_used), _p_drop)
# input params depend on input and sampled only, never on output/derived
all_input_arguments = set(chain(*self._input_args.values()))
bad_input_dependencies = all_input_arguments.difference(
set(self.input_params()).union(set(self.sampled_params())).union(
set(self.constant_params())))
if bad_input_dependencies:
raise LoggedError(
self.log,
"Input parameters defined as functions can only depend on other "
"input parameters that are not defined as functions. "
"In particular, an input parameter cannot depend on %r",
list(bad_input_dependencies))
def initialize(self):
"""Imports the PolyChord sampler and prepares its arguments."""
if am_single_or_primary_process(
): # rank = 0 (MPI master) or None (no MPI)
self.log.info("Initializing")
# If path not given, try using general path to modules
if not self.path and self.path_install:
self.path = get_path(self.path_install)
if self.path:
if am_single_or_primary_process():
self.log.info("Importing *local* PolyChord from " + self.path)
if not os.path.exists(os.path.realpath(self.path)):
raise LoggedError(
self.log, "The given path does not exist. "
"Try installing PolyChord with "
"'cobaya-install polychord -m [modules_path]")
pc_build_path = get_build_path(self.path)
if not pc_build_path:
raise LoggedError(
self.log, "Either PolyChord is not in the given folder, "
"'%s', or you have not compiled it.", self.path)
# Inserting the previously found path into the list of import folders
sys.path.insert(0, pc_build_path)
else:
self.log.info("Importing *global* PolyChord.")
try:
import pypolychord
from pypolychord.settings import PolyChordSettings
self.pc = pypolychord
except ImportError:
raise LoggedError(
self.log, "Couldn't find the PolyChord python interface. "
"Make sure that you have compiled it, and that you either\n"
" (a) specify a path (you didn't) or\n"
" (b) install the Python interface globally with\n"
" '/path/to/PolyChord/python setup.py install --user'")
# Prepare arguments and settings
self.nDims = self.model.prior.d()
self.nDerived = (len(self.model.parameterization.derived_params()) +
len(self.model.prior) +
len(self.model.likelihood._likelihoods))
if self.logzero is None:
self.logzero = np.nan_to_num(-np.inf)
if self.max_ndead == np.inf:
self.max_ndead = -1
for p in ["nlive", "nprior", "max_ndead"]:
setattr(self, p,
read_dnumber(getattr(self, p), self.nDims, dtype=int))
# Fill the automatic ones
if getattr(self, "feedback", None) is None:
values = {
logging.CRITICAL: 0,
logging.ERROR: 0,
logging.WARNING: 0,
logging.INFO: 1,
logging.DEBUG: 2
}
self.feedback = values[self.log.getEffectiveLevel()]
try:
output_folder = getattr(self.output, "folder")
output_prefix = getattr(self.output, "prefix") or ""
self.read_resume = self.resuming
except AttributeError:
# dummy output -- no resume!
self.read_resume = False
from tempfile import gettempdir
output_folder = gettempdir()
if am_single_or_primary_process():
from random import random
output_prefix = hex(int(random() * 16**6))[2:]
else:
output_prefix = None
if more_than_one_process():
output_prefix = get_mpi_comm().bcast(output_prefix, root=0)
self.base_dir = os.path.join(output_folder, self.base_dir)
self.file_root = output_prefix
if am_single_or_primary_process():
# Creating output folder, if it does not exist (just one process)
if not os.path.exists(self.base_dir):
os.makedirs(self.base_dir)
# Idem, a clusters folder if needed -- notice that PolyChord's default
# is "True", here "None", hence the funny condition below
if self.do_clustering is not False: # None here means "default"
try:
os.makedirs(os.path.join(self.base_dir, clusters))
except OSError: # exists!
pass
self.log.info("Storing raw PolyChord output in '%s'.",
self.base_dir)
# Exploiting the speed hierarchy
if self.blocking:
speeds, blocks = self.model.likelihood._check_speeds_of_params(
self.blocking)
else:
speeds, blocks = self.model.likelihood._speeds_of_params(
int_speeds=True)
blocks_flat = list(chain(*blocks))
self.ordering = [
blocks_flat.index(p)
for p in self.model.parameterization.sampled_params()
]
self.grade_dims = np.array([len(block) for block in blocks])
# bugfix: pypolychord's C interface for Fortran does not like int numpy types
self.grade_dims = [int(x) for x in self.grade_dims]
# Steps per block
# NB: num_repeats is ignored by PolyChord when int "grade_frac" given,
# so needs to be applied by hand.
# Make sure that speeds are integer, and that the slowest is 1,
# for a straightforward application of num_repeats
speeds = relative_to_int(speeds, 1)
# In num_repeats, `d` is interpreted as dimension of each block
self.grade_frac = [
int(speed * read_dnumber(self.num_repeats, dim_block))
for speed, dim_block in zip(speeds, self.grade_dims)
]
# Assign settings
pc_args = [
"nlive", "num_repeats", "nprior", "do_clustering",
"precision_criterion", "max_ndead", "boost_posterior", "feedback",
"logzero", "posteriors", "equals", "compression_factor",
"cluster_posteriors", "write_resume", "read_resume", "write_stats",
"write_live", "write_dead", "base_dir", "grade_frac", "grade_dims",
"feedback", "read_resume", "base_dir", "file_root", "grade_frac",
"grade_dims"
]
# As stated above, num_repeats is ignored, so let's not pass it
pc_args.pop(pc_args.index("num_repeats"))
self.pc_settings = PolyChordSettings(
self.nDims,
self.nDerived,
seed=(self.seed if self.seed is not None else -1),
**{
p: getattr(self, p)
for p in pc_args if getattr(self, p) is not None
})
# prior conversion from the hypercube
bounds = self.model.prior.bounds(
confidence_for_unbounded=self.confidence_for_unbounded)
# Check if priors are bounded (nan's to inf)
inf = np.where(np.isinf(bounds))
if len(inf[0]):
params_names = self.model.parameterization.sampled_params()
params = [params_names[i] for i in sorted(list(set(inf[0])))]
raise LoggedError(
self.log,
"PolyChord needs bounded priors, but the parameter(s) '"
"', '".join(params) + "' is(are) unbounded.")
locs = bounds[:, 0]
scales = bounds[:, 1] - bounds[:, 0]
# This function re-scales the parameters AND puts them in the right order
self.pc_prior = lambda x: (locs + np.array(x)[self.ordering] * scales
).tolist()
# We will need the volume of the prior domain, since PolyChord divides by it
self.logvolume = np.log(np.prod(scales))
# Prepare callback function
if self.callback_function is not None:
self.callback_function_callable = (get_external_function(
self.callback_function))
self.last_point_callback = 0
# Prepare runtime live and dead points collections
self.live = Collection(self.model,
None,
name="live",
initial_size=self.pc_settings.nlive)
self.dead = Collection(self.model, self.output, name="dead")
self.n_sampled = len(self.model.parameterization.sampled_params())
self.n_derived = len(self.model.parameterization.derived_params())
self.n_priors = len(self.model.prior)
self.n_likes = len(self.model.likelihood._likelihoods)
# Done!
if am_single_or_primary_process():
self.log.info("Calling PolyChord with arguments:")
for p, v in inspect.getmembers(self.pc_settings,
lambda a: not (callable(a))):
if not p.startswith("_"):
self.log.info(" %s: %s", p, v)
def initialize(self):
"""Imports the PolyChord sampler and prepares its arguments."""
# Allow global import if no direct path specification
allow_global = not self.path
if not self.path and self.packages_path:
self.path = self.get_path(self.packages_path)
self.pc = self.is_installed(path=self.path, allow_global=allow_global)
if not self.pc:
raise NotInstalledError(
self.log,
"Could not find PolyChord. Check error message above. "
"To install it, run 'cobaya-install polychord --%s "
"[packages_path]'", _packages_path_arg)
# Prepare arguments and settings
from pypolychord.settings import PolyChordSettings
self.n_sampled = len(self.model.parameterization.sampled_params())
self.n_derived = len(self.model.parameterization.derived_params())
self.n_priors = len(self.model.prior)
self.n_likes = len(self.model.likelihood)
self.nDims = self.model.prior.d()
self.nDerived = (self.n_derived + self.n_priors + self.n_likes)
if self.logzero is None:
self.logzero = np.nan_to_num(-np.inf)
if self.max_ndead == np.inf:
self.max_ndead = -1
self._quants_d_units = ["nlive", "max_ndead"]
for p in self._quants_d_units:
if getattr(self, p) is not None:
setattr(
self, p,
NumberWithUnits(getattr(self, p),
"d",
scale=self.nDims,
dtype=int).value)
self._quants_nlive_units = ["nprior"]
for p in self._quants_nlive_units:
if getattr(self, p) is not None:
setattr(
self, p,
NumberWithUnits(getattr(self, p),
"nlive",
scale=self.nlive,
dtype=int).value)
# Fill the automatic ones
if getattr(self, "feedback", None) is None:
values = {
logging.CRITICAL: 0,
logging.ERROR: 0,
logging.WARNING: 0,
logging.INFO: 1,
logging.DEBUG: 2
}
self.feedback = values[self.log.getEffectiveLevel()]
# Prepare output folders and prefixes
if self.output:
self.file_root = self.output.prefix
self.read_resume = self.output.is_resuming()
else:
output_prefix = share_mpi(
hex(int(random() * 16**6))[2:] if is_main_process() else None)
self.file_root = output_prefix
# dummy output -- no resume!
self.read_resume = False
self.base_dir = self.get_base_dir(self.output)
self.raw_clusters_dir = os.path.join(self.base_dir, self._clusters_dir)
self.output.create_folder(self.base_dir)
if self.do_clustering:
self.clusters_folder = self.get_clusters_dir(self.output)
self.output.create_folder(self.clusters_folder)
self.mpi_info("Storing raw PolyChord output in '%s'.", self.base_dir)
# Exploiting the speed hierarchy
if self.blocking:
blocks, oversampling_factors = self.model.check_blocking(
self.blocking)
else:
if self.measure_speeds:
self.model.measure_and_set_speeds(n=self.measure_speeds)
blocks, oversampling_factors = self.model.get_param_blocking_for_sampler(
oversample_power=self.oversample_power)
self.mpi_info("Parameter blocks and their oversampling factors:")
max_width = len(str(max(oversampling_factors)))
for f, b in zip(oversampling_factors, blocks):
self.mpi_info("* %" + "%d" % max_width + "d : %r", f, b)
# Save blocking in updated info, in case we want to resume
self._updated_info["blocking"] = list(zip(oversampling_factors,
blocks))
blocks_flat = list(chain(*blocks))
self.ordering = [
blocks_flat.index(p)
for p in self.model.parameterization.sampled_params()
]
self.grade_dims = [len(block) for block in blocks]
# Steps per block
# NB: num_repeats is ignored by PolyChord when int "grade_frac" given,
# so needs to be applied by hand.
# In num_repeats, `d` is interpreted as dimension of each block
self.grade_frac = [
int(o * read_dnumber(self.num_repeats, dim_block))
for o, dim_block in zip(oversampling_factors, self.grade_dims)
]
# Assign settings
pc_args = [
"nlive", "num_repeats", "nprior", "do_clustering",
"precision_criterion", "max_ndead", "boost_posterior", "feedback",
"logzero", "posteriors", "equals", "compression_factor",
"cluster_posteriors", "write_resume", "read_resume", "write_stats",
"write_live", "write_dead", "base_dir", "grade_frac", "grade_dims",
"feedback", "read_resume", "base_dir", "file_root", "grade_frac",
"grade_dims"
]
# As stated above, num_repeats is ignored, so let's not pass it
pc_args.pop(pc_args.index("num_repeats"))
self.pc_settings = PolyChordSettings(
self.nDims,
self.nDerived,
seed=(self.seed if self.seed is not None else -1),
**{
p: getattr(self, p)
for p in pc_args if getattr(self, p) is not None
})
# prior conversion from the hypercube
bounds = self.model.prior.bounds(
confidence_for_unbounded=self.confidence_for_unbounded)
# Check if priors are bounded (nan's to inf)
inf = np.where(np.isinf(bounds))
if len(inf[0]):
params_names = self.model.parameterization.sampled_params()
params = [params_names[i] for i in sorted(list(set(inf[0])))]
raise LoggedError(
self.log,
"PolyChord needs bounded priors, but the parameter(s) '"
"', '".join(params) + "' is(are) unbounded.")
locs = bounds[:, 0]
scales = bounds[:, 1] - bounds[:, 0]
# This function re-scales the parameters AND puts them in the right order
self.pc_prior = lambda x: (locs + np.array(x)[self.ordering] * scales
).tolist()
# We will need the volume of the prior domain, since PolyChord divides by it
self.logvolume = np.log(np.prod(scales))
# Prepare callback function
if self.callback_function is not None:
self.callback_function_callable = (get_external_function(
self.callback_function))
self.last_point_callback = 0
# Prepare runtime live and dead points collections
self.live = Collection(self.model,
None,
name="live",
initial_size=self.pc_settings.nlive)
self.dead = Collection(self.model, self.output, name="dead")
# Done!
if is_main_process():
self.log.debug("Calling PolyChord with arguments:")
for p, v in inspect.getmembers(self.pc_settings,
lambda a: not (callable(a))):
if not p.startswith("_"):
self.log.debug(" %s: %s", p, v)
self.mpi_info("Initialized!")
def initialise(self):
"""Initialises the sampler:
creates the proposal distribution and draws the initial sample."""
self.log.info("Initializing")
# Burning-in countdown -- the +1 accounts for the initial point (always accepted)
self.burn_in_left = self.burn_in + 1
# One collection per MPI process: `name` is the MPI rank + 1
name = str(1 + (lambda r: r if r is not None else 0)(get_mpi_rank()))
self.collection = Collection(self.parametrization,
self.likelihood,
self.output,
name=name)
self.current_point = OnePoint(self.parametrization,
self.likelihood,
self.output,
name=name)
# Use the standard steps by default
self.get_new_sample = self.get_new_sample_metropolis
# Prepare oversampling / fast-dragging if applicable
self.effective_max_samples = self.max_samples
if self.oversample and self.drag:
self.log.error(
"Choose either oversampling or fast-dragging, not both.")
raise HandledException
# if (self.oversample or self.drag) and len(set(factors)) == 1:
# self.log.error("All block speeds are similar: "
# "no dragging or oversampling possible.")
# raise HandledException
if self.oversample:
factors, blocks = self.likelihood.speeds_of_params(
oversampling_factors=True)
self.oversampling_factors = factors
# WIP: actually, we would have to re-normalise to the dimension of the blocks.
self.log.info("Oversampling with factors:\n" + "\n".join([
" %d : %r" % (f, b)
for f, b in zip(self.oversampling_factors, blocks)
]))
# WIP: useless until likelihoods have STATES!
self.log.error("Sorry, oversampling is WIP")
raise HandledException
elif self.drag:
# WIP: for now, can only separate between theory and likelihoods
# until likelihoods have states
if not self.likelihood.theory:
self.log.error(
"WIP: dragging disabled for now when no theory code present."
)
raise HandledException
# if self.max_speed_slow < min(speeds) or self.max_speed_slow >= max(speeds):
# self.log.error("The maximum speed considered slow, `max_speed_slow`, must be "
# "%g <= `max_speed_slow < %g, and is %g",
# min(speeds), max(speeds), self.max_speed_slow)
# raise HandledException
speeds, blocks = self.likelihood.speeds_of_params(int_speeds=True,
fast_slow=True)
if np.all(speeds == speeds[0]):
self.log.error(
"All speeds are equal: cannot drag! Make sure to define, "
"especially, the speed of the fastest likelihoods.")
self.i_last_slow_block = 0 # just theory can be slow for now
fast_params = list(chain(*blocks[1 + self.i_last_slow_block:]))
self.n_slow = sum(
len(blocks[i]) for i in range(1 + self.i_last_slow_block))
self.drag_interp_steps = int(self.drag *
np.round(min(speeds[1:]) / speeds[0]))
self.log.info("Dragging with oversampling per step:\n" +
"\n".join([
" %d : %r" % (f, b)
for f, b in zip([1, self.drag_interp_steps],
[blocks[0], fast_params])
]))
self.get_new_sample = self.get_new_sample_dragging
else:
_, blocks = self.likelihood.speeds_of_params()
self.oversampling_factors = [1 for b in blocks]
self.n_slow = len(self.parametrization.sampled_params())
# Turn parameter names into indices
blocks = [[
list(self.parametrization.sampled_params().keys()).index(p)
for p in b
] for b in blocks]
self.proposer = BlockedProposer(
blocks,
oversampling_factors=getattr(self, "oversampling_factors", None),
i_last_slow_block=getattr(self, "i_last_slow_block", None),
propose_scale=self.propose_scale)
# Build the initial covariance matrix of the proposal
covmat = self.initial_proposal_covmat()
self.log.info("Sampling with covariance matrix:")
self.log.info("%r", covmat)
self.proposer.set_covariance(covmat)
# Prepare callback function
if self.callback_function is not None:
self.callback_function_callable = (get_external_function(
self.callback_function))
