diff --git a/deepdog/__init__.py b/deepdog/__init__.py
index 8dc5987..5db1f84 100644
--- a/deepdog/__init__.py
+++ b/deepdog/__init__.py
@@ -4,7 +4,7 @@ from deepdog.bayes_run import BayesRun
 from deepdog.bayes_run_simulpairs import BayesRunSimulPairs
 from deepdog.real_spectrum_run import RealSpectrumRun
 from deepdog.temp_aware_real_spectrum_run import TempAwareRealSpectrumRun
-
+from deepdog.bayes_run_with_ss import BayesRunWithSubspaceSimulation
 
 def get_version():
 	return __version__
@@ -16,6 +16,7 @@ __all__ = [
 	"BayesRunSimulPairs",
 	"RealSpectrumRun",
 	"TempAwareRealSpectrumRun",
+	"BayesRunWithSubspaceSimulation",
 ]
 
 
diff --git a/deepdog/bayes_run_with_ss.py b/deepdog/bayes_run_with_ss.py
new file mode 100644
index 0000000..ad73e00
--- /dev/null
+++ b/deepdog/bayes_run_with_ss.py
@@ -0,0 +1,229 @@
+import deepdog.subset_simulation
+import pdme.inputs
+import pdme.model
+import pdme.measurement.input_types
+import pdme.measurement.oscillating_dipole
+import pdme.util.fast_v_calc
+import pdme.util.fast_nonlocal_spectrum
+from typing import Sequence, Tuple, List, Optional
+import datetime
+import csv
+import multiprocessing
+import logging
+import numpy
+import numpy.typing
+
+
+# TODO: remove hardcode
+CHUNKSIZE = 50
+
+# TODO: It's garbage to have this here duplicated from pdme.
+DotInput = Tuple[numpy.typing.ArrayLike, float]
+
+
+_logger = logging.getLogger(__name__)
+
+
+class BayesRunWithSubspaceSimulation:
+	"""
+	A single Bayes run for a given set of dots.
+
+	Parameters
+	----------
+	dot_inputs : Sequence[DotInput]
+	The dot inputs for this bayes run.
+
+	models_with_names : Sequence[Tuple(str, pdme.model.DipoleModel)]
+	The models to evaluate.
+
+	actual_model : pdme.model.DipoleModel
+	The model which is actually correct.
+
+	filename_slug : str
+	The filename slug to include.
+
+	run_count: int
+	The number of runs to do.
+	"""
+
+	def __init__(
+		self,
+		dot_positions: Sequence[numpy.typing.ArrayLike],
+		frequency_range: Sequence[float],
+		models_with_names: Sequence[Tuple[str, pdme.model.DipoleModel]],
+		actual_model: pdme.model.DipoleModel,
+		filename_slug: str,
+		max_frequency: float = 20,
+		end_threshold: float = None,
+		run_count = 100,
+		chunksize: int = CHUNKSIZE,
+		ss_n_c: int = 500,
+		ss_n_s: int = 100,
+		ss_m_max: int = 15,
+		ss_target_cost: Optional[float] = None,
+		ss_level_0_seed: int = 200,
+		ss_mcmc_seed: int = 20,
+		ss_use_adaptive_steps=True,
+		ss_default_phi_step=0.01,
+		ss_default_theta_step=0.01,
+		ss_default_r_step=0.01,
+		ss_default_w_log_step=0.01,
+		ss_default_upper_w_log_step=4,
+	) -> None:
+		self.dot_inputs = pdme.inputs.inputs_with_frequency_range(
+			dot_positions, frequency_range
+		)
+		self.dot_inputs_array = pdme.measurement.input_types.dot_inputs_to_array(
+			self.dot_inputs
+		)
+
+		self.models_with_names = models_with_names
+		self.models = [model for (_, model) in models_with_names]
+		self.model_names = [name for (name, _) in models_with_names]
+		self.actual_model = actual_model
+
+		self.n: int
+		try:
+			self.n = self.actual_model.n  # type: ignore
+		except AttributeError:
+			self.n = 1
+
+		self.model_count = len(self.models)
+
+		self.csv_fields = []
+		for i in range(self.n):
+			self.csv_fields.extend(
+				[
+					f"dipole_moment_{i+1}",
+					f"dipole_location_{i+1}",
+					f"dipole_frequency_{i+1}",
+				]
+			)
+		self.compensate_zeros = True
+		self.chunksize = chunksize
+		for name in self.model_names:
+			self.csv_fields.extend([f"{name}_likelihood", f"{name}_prob"])
+
+		self.probabilities = [1 / self.model_count] * self.model_count
+
+		timestamp = datetime.datetime.now().strftime("%Y%m%d-%H%M%S")
+		self.filename = f"{timestamp}-{filename_slug}.bayesrunwithss.csv"
+		self.max_frequency = max_frequency
+
+		if end_threshold is not None:
+			if 0 < end_threshold < 1:
+				self.end_threshold: float = end_threshold
+				self.use_end_threshold = True
+				_logger.info(f"Will abort early, at {self.end_threshold}.")
+			else:
+				raise ValueError(
+					f"end_threshold should be between 0 and 1, but is actually {end_threshold}"
+				)
+		
+		self.ss_n_c = ss_n_c
+		self.ss_n_s = ss_n_s
+		self.ss_m_max = ss_m_max
+		self.ss_target_cost = ss_target_cost
+		self.ss_level_0_seed = ss_level_0_seed
+		self.ss_mcmc_seed = ss_mcmc_seed
+		self.ss_use_adaptive_steps = ss_use_adaptive_steps
+		self.ss_default_phi_step = ss_default_phi_step
+		self.ss_default_theta_step = ss_default_theta_step
+		self.ss_default_r_step = ss_default_r_step
+		self.ss_default_w_log_step = ss_default_w_log_step
+		self.ss_default_upper_w_log_step = ss_default_upper_w_log_step
+
+		self.run_count = run_count
+
+	def go(self) -> None:
+		with open(self.filename, "a", newline="") as outfile:
+			writer = csv.DictWriter(outfile, fieldnames=self.csv_fields, dialect="unix")
+			writer.writeheader()
+
+		for run in range(1, self.run_count + 1):
+
+			# Generate the actual dipoles
+			actual_dipoles = self.actual_model.get_dipoles(self.max_frequency)
+
+			measurements = actual_dipoles.get_dot_measurements(
+				self.dot_inputs
+			)
+
+
+			_logger.info(f"Going to work on dipole at {actual_dipoles.dipoles}")
+
+			# define a new seed sequence for each run
+
+			results = []
+			_logger.debug("Going to iterate over models now")
+			for model_count, model in enumerate(self.models_with_names):
+				_logger.debug(f"Doing model #{model_count}, {model[0]}")
+				subset_run = deepdog.subset_simulation.SubsetSimulation(
+					model,
+					self.dot_inputs,
+					measurements,
+					self.ss_n_c,
+					self.ss_n_s,
+					self.ss_m_max,
+					self.ss_target_cost,
+					self.ss_level_0_seed,
+					self.ss_mcmc_seed,
+					self.ss_use_adaptive_steps,
+					self.ss_default_phi_step,
+					self.ss_default_theta_step,
+					self.ss_default_r_step,
+					self.ss_default_w_log_step,
+					self.ss_default_upper_w_log_step,
+				)
+				results.append(subset_run.execute())
+
+			_logger.debug("Done, constructing output now")
+			row = {
+				"dipole_moment_1": actual_dipoles.dipoles[0].p,
+				"dipole_location_1": actual_dipoles.dipoles[0].s,
+				"dipole_frequency_1": actual_dipoles.dipoles[0].w,
+			}
+			for i in range(1, self.n):
+				try:
+					current_dipoles = actual_dipoles.dipoles[i]
+					row[f"dipole_moment_{i+1}"] = current_dipoles.p
+					row[f"dipole_location_{i+1}"] = current_dipoles.s
+					row[f"dipole_frequency_{i+1}"] = current_dipoles.w
+				except IndexError:
+					_logger.info(f"Not writing anymore, saw end after {i}")
+					break
+
+			likelihoods: List[float] = []
+
+			for (name, result) in zip(self.model_names, results):
+				likelihoods.append(result.over_target_likelihood)
+				row[f"{name}_likelihood"] = result.over_target_likelihood
+
+			success_weight = sum(
+				[
+					likelihood * prob
+					for likelihood, prob in zip(likelihoods, self.probabilities)
+				]
+			)
+			new_probabilities = [
+				likelihood * old_prob / success_weight
+				for likelihood, old_prob in zip(likelihoods, self.probabilities)
+			]
+			self.probabilities = new_probabilities
+			for name, probability in zip(self.model_names, self.probabilities):
+				row[f"{name}_prob"] = probability
+			_logger.info(row)
+
+			with open(self.filename, "a", newline="") as outfile:
+				writer = csv.DictWriter(
+					outfile, fieldnames=self.csv_fields, dialect="unix"
+				)
+				writer.writerow(row)
+
+			if self.use_end_threshold:
+				max_prob = max(self.probabilities)
+				if max_prob > self.end_threshold:
+					_logger.info(
+						f"Aborting early, because {max_prob} is greater than {self.end_threshold}"
+					)
+					break
diff --git a/deepdog/subset_simulation/__init__.py b/deepdog/subset_simulation/__init__.py
new file mode 100644
index 0000000..68b2fef
--- /dev/null
+++ b/deepdog/subset_simulation/__init__.py
@@ -0,0 +1,3 @@
+from deepdog.subset_simulation.subset_simulation_impl import SubsetSimulation
+
+__all__ = ["SubsetSimulation"]
diff --git a/deepdog/subset_simulation/subset_simulation_impl.py b/deepdog/subset_simulation/subset_simulation_impl.py
new file mode 100644
index 0000000..377ce43
--- /dev/null
+++ b/deepdog/subset_simulation/subset_simulation_impl.py
@@ -0,0 +1,310 @@
+import logging
+import numpy
+import pdme.measurement
+import pdme.measurement.input_types
+import pdme.subspace_simulation
+import bisect
+from typing import Sequence, Tuple, Optional
+
+from dataclasses import dataclass
+
+_logger = logging.getLogger(__name__)
+
+
+@dataclass
+class SubsetSimulationResult:
+	probs_list: Sequence[Tuple]
+	over_target_cost: Optional[float]
+	over_target_likelihood: Optional[float]
+	under_target_cost: Optional[float]
+	under_target_likelihood: Optional[float]
+
+
+class SubsetSimulation:
+	def __init__(
+		self,
+		model_name_pair,
+		dot_inputs,
+		actual_measurements: Sequence[pdme.measurement.DotMeasurement],
+		n_c: int,
+		n_s: int,
+		m_max: int,
+		target_cost: Optional[float] = None,
+		level_0_seed: int = 200,
+		mcmc_seed: int = 20,
+		use_adaptive_steps=True,
+		default_phi_step=0.01,
+		default_theta_step=0.01,
+		default_r_step=0.01,
+		default_w_log_step=0.01,
+		default_upper_w_log_step=4,
+	):
+		name, model = model_name_pair
+		self.model_name = name
+		self.model = model
+		_logger.info(f"got model {self.model_name}")
+
+		self.dot_inputs_array = pdme.measurement.input_types.dot_inputs_to_array(
+			dot_inputs
+		)
+		# _logger.debug(f"actual measurements: {actual_measurements}")
+		self.actual_measurement_array = numpy.array([m.v for m in actual_measurements])
+
+		def cost_function_to_use(dipoles_to_test):
+			return pdme.subspace_simulation.proportional_costs_vs_actual_measurement(
+				self.dot_inputs_array, self.actual_measurement_array, dipoles_to_test
+			)
+
+		self.cost_function_to_use = cost_function_to_use
+
+		self.n_c = n_c
+		self.n_s = n_s
+		self.m_max = m_max
+
+		self.level_0_seed = level_0_seed
+		self.mcmc_seed = mcmc_seed
+
+		self.use_adaptive_steps = use_adaptive_steps
+		self.default_phi_step = default_phi_step
+		self.default_theta_step = default_theta_step
+		self.default_r_step = default_r_step
+		self.default_w_log_step = default_w_log_step
+		self.default_upper_w_log_step = default_upper_w_log_step
+
+		_logger.info(f"using params:")
+		_logger.info(f"\tn_c: {self.n_c}")
+		_logger.info(f"\tn_s: {self.n_s}")
+		_logger.info(f"\tm: {self.m_max}")
+		_logger.info(f"let's do level 0...")
+
+		self.target_cost = target_cost
+		_logger.info(f"will stop at target cost {target_cost}")
+
+	def execute(self) -> SubsetSimulationResult:
+
+		probs_list = []
+
+		sample_dipoles = self.model.get_monte_carlo_dipole_inputs(
+			self.n_c * self.n_s,
+			-1,
+			rng_to_use=numpy.random.default_rng(self.level_0_seed),
+		)
+		# _logger.debug(sample_dipoles)
+		# _logger.debug(sample_dipoles.shape)
+		costs = self.cost_function_to_use(sample_dipoles)
+
+		_logger.debug(f"costs: {costs}")
+		sorted_indexes = costs.argsort()[::-1]
+
+		_logger.debug(costs[sorted_indexes])
+		_logger.debug(sample_dipoles[sorted_indexes])
+
+		sorted_costs = costs[sorted_indexes]
+		sorted_dipoles = sample_dipoles[sorted_indexes]
+
+		threshold_cost = sorted_costs[-self.n_c]
+
+		all_dipoles = numpy.array(
+			[
+				pdme.subspace_simulation.sort_array_of_dipoles_by_frequency(samp)
+				for samp in sorted_dipoles
+			]
+		)
+		all_chains = list(zip(sorted_costs, all_dipoles))
+
+		mcmc_rng = numpy.random.default_rng(self.mcmc_seed)
+
+		for i in range(self.m_max):
+			next_seeds = all_chains[-self.n_c :]
+
+			for cost_index, cost_chain in enumerate(all_chains[: -self.n_c]):
+				probs_list.append(
+					(
+						((self.n_c * self.n_s - cost_index) / (self.n_c * self.n_s))
+						/ (self.n_s ** (i)),
+						cost_chain[0],
+						i + 1,
+					)
+				)
+
+			next_seeds_as_array = numpy.array([s for _, s in next_seeds])
+
+			stdevs = self.get_stdevs_from_arrays(next_seeds_as_array)
+			_logger.info(f"got stdevs: {stdevs.stdevs}")
+
+			all_chains = []
+			for c, s in next_seeds:
+				# chain = mcmc(s, threshold_cost, n_s, model, dot_inputs_array, actual_measurement_array, mcmc_rng, curr_cost=c, stdevs=stdevs)
+				# until new version gotta do
+				chain = self.model.get_mcmc_chain(
+					s,
+					self.cost_function_to_use,
+					self.n_s,
+					threshold_cost,
+					stdevs,
+					initial_cost=c,
+					rng_arg=mcmc_rng,
+				)
+				for cost, chained in chain:
+					try:
+						filtered_cost = cost[0]
+					except IndexError:
+						filtered_cost = cost
+					all_chains.append((filtered_cost, chained))
+
+			# _logger.debug(all_chains)
+
+			all_chains.sort(key=lambda c: c[0], reverse=True)
+
+			threshold_cost = all_chains[-self.n_c][0]
+			_logger.info(
+				f"current threshold cost: {threshold_cost}, at P = (1 / {self.n_s})^{i + 1}"
+			)
+			if (self.target_cost is not None) and (threshold_cost < self.target_cost):
+				_logger.info(
+					f"got a threshold cost {threshold_cost}, less than {self.target_cost}. will leave early"
+				)
+
+				cost_list = [c[0] for c in all_chains]
+				over_index = reverse_bisect_right(cost_list, self.target_cost)
+
+				shorter_probs_list = []
+				for cost_index, cost_chain in enumerate(all_chains):
+					probs_list.append(
+						(
+							((self.n_c * self.n_s - cost_index) / (self.n_c * self.n_s))
+							/ (self.n_s ** (i)),
+							cost_chain[0],
+							i + 1,
+						)
+					)
+					shorter_probs_list.append(
+						(
+							cost_chain[0],
+							((self.n_c * self.n_s - cost_index) / (self.n_c * self.n_s))
+							/ (self.n_s ** (i)),
+						)
+					)
+				# _logger.info(shorter_probs_list)
+				result = SubsetSimulationResult(
+					probs_list=probs_list,
+					over_target_cost=shorter_probs_list[over_index - 1][0],
+					over_target_likelihood=shorter_probs_list[over_index - 1][1],
+					under_target_cost=shorter_probs_list[over_index][0],
+					under_target_likelihood=shorter_probs_list[over_index][1],
+				)
+				return result
+
+			# _logger.debug([c[0] for c in all_chains[-n_c:]])
+			_logger.info(f"doing level {i + 1}")
+
+		for cost_index, cost_chain in enumerate(all_chains):
+			probs_list.append(
+				(
+					((self.n_c * self.n_s - cost_index) / (self.n_c * self.n_s))
+					/ (self.n_s ** (self.m_max)),
+					cost_chain[0],
+					self.m_max + 1,
+				)
+			)
+		threshold_cost = all_chains[-self.n_c][0]
+		_logger.info(
+			f"final threshold cost: {threshold_cost}, at P = (1 / {self.n_s})^{self.m_max + 1}"
+		)
+		for a in all_chains[-10:]:
+			_logger.info(a)
+		# for prob, prob_cost in probs_list:
+		# 	_logger.info(f"\t{prob}: {prob_cost}")
+		probs_list.sort(key=lambda c: c[0], reverse=True)
+		result = SubsetSimulationResult(
+			probs_list=probs_list,
+			over_target_cost=None,
+			over_target_likelihood=None,
+			under_target_cost=None,
+			under_target_likelihood=None,
+		)
+		return result
+
+	def get_stdevs_from_arrays(
+		self, array
+	) -> pdme.subspace_simulation.MCMCStandardDeviation:
+		# stdevs = get_stdevs_from_arrays(next_seeds_as_array, model)
+		if self.use_adaptive_steps:
+
+			stdev_array = []
+			count = array.shape[1]
+			for dipole_index in range(count):
+				selected = array[:, dipole_index]
+				pxs = selected[:, 0]
+				pys = selected[:, 1]
+				pzs = selected[:, 2]
+				thetas = numpy.arccos(pzs / self.model.pfixed)
+				phis = numpy.arctan2(pys, pxs)
+
+				rstdevs = numpy.maximum(
+					numpy.std(selected, axis=0)[3:6],
+					self.default_r_step / (self.n_s * 10),
+				)
+				frequency_stdevs = numpy.minimum(
+					numpy.maximum(
+						numpy.std(numpy.log(selected[:, -1])),
+						self.default_w_log_step / (self.n_s * 10),
+					),
+					self.default_upper_w_log_step,
+				)
+				stdev_array.append(
+					pdme.subspace_simulation.DipoleStandardDeviation(
+						p_theta_step=max(
+							numpy.std(thetas), self.default_theta_step / (self.n_s * 10)
+						),
+						p_phi_step=max(
+							numpy.std(phis), self.default_phi_step / (self.n_s * 10)
+						),
+						rx_step=rstdevs[0],
+						ry_step=rstdevs[1],
+						rz_step=rstdevs[2],
+						w_log_step=frequency_stdevs,
+					)
+				)
+		else:
+			default_stdev = pdme.subspace_simulation.DipoleStandardDeviation(
+				self.default_phi_step,
+				self.default_theta_step,
+				self.default_r_step,
+				self.default_r_step,
+				self.default_r_step,
+				self.default_w_log_step,
+			)
+			stdev_array = [default_stdev]
+		stdevs = pdme.subspace_simulation.MCMCStandardDeviation(stdev_array)
+		return stdevs
+
+
+def reverse_bisect_right(a, x, lo=0, hi=None):
+	"""Return the index where to insert item x in list a, assuming a is sorted in descending order.
+
+	The return value i is such that all e in a[:i] have e >= x, and all e in
+	a[i:] have e < x.  So if x already appears in the list, a.insert(x) will
+	insert just after the rightmost x already there.
+
+	Optional args lo (default 0) and hi (default len(a)) bound the
+	slice of a to be searched.
+
+	Essentially, the function returns number of elements in a which are >= than x.
+	>>> a = [8, 6, 5, 4, 2]
+	>>> reverse_bisect_right(a, 5)
+	3
+	>>> a[:reverse_bisect_right(a, 5)]
+	[8, 6, 5]
+	"""
+	if lo < 0:
+		raise ValueError("lo must be non-negative")
+	if hi is None:
+		hi = len(a)
+	while lo < hi:
+		mid = (lo + hi) // 2
+		if x > a[mid]:
+			hi = mid
+		else:
+			lo = mid + 1
+	return lo
diff --git a/poetry.lock b/poetry.lock
index 42ad5ec..3fa9092 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -360,7 +360,7 @@ python-versions = ">=3.7"
 
 [[package]]
 name = "pdme"
-version = "0.8.9"
+version = "0.9.1"
 description = "Python dipole model evaluator"
 category = "main"
 optional = false
@@ -730,7 +730,7 @@ testing = ["pytest (>=6)", "pytest-checkdocs (>=2.4)", "flake8 (<5)", "pytest-co
 [metadata]
 lock-version = "1.1"
 python-versions = ">=3.8.1,<3.10"
-content-hash = "7a708c21744e80b6b5e94f7ef2d5b58f9539179d2c0dd1d9f17b3daa4151d52f"
+content-hash = "0161af7edf18c16819f1ce083ab491c17c9809f2770219725131451b1a16a970"
 
 [metadata.files]
 black = []
diff --git a/pyproject.toml b/pyproject.toml
index 6f375fc..f252cbd 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -6,7 +6,7 @@ authors = ["Deepak Mallubhotla <dmallubhotla+github@gmail.com>"]
 
 [tool.poetry.dependencies]
 python = ">=3.8.1,<3.10"
-pdme = "^0.8.9"
+pdme = "^0.9.1"
 numpy = "1.22.3"
 scipy = "1.10"