def setUpClass(cls):
# load observations
import pyemma.datasets
obs = pyemma.datasets.load_2well_discrete().dtraj_T100K_dt10
obs -= np.min(obs) # remove empty states
# hidden states
nstates = 2
# run with lag 1 and 10
cls.msm_lag1 = msm.estimate_markov_model([obs],
1,
reversible=True,
connectivity='largest')
cls.hmsm_lag1 = msm.estimate_hidden_markov_model([obs],
nstates,
1,
reversible=True,
observe_nonempty=True)
cls.msm_lag10 = msm.estimate_markov_model([obs],
10,
reversible=True,
connectivity='largest')
cls.hmsm_lag10 = msm.estimate_hidden_markov_model(
[obs], nstates, 10, reversible=True, observe_nonempty=True)
def test_oom(self):
from pyemma import msm
msm_one_over_n = msm.estimate_markov_model(self.dtraj, lag=1, mincount_connectivity='1/n', weights='oom')
# we now restrict the connectivity to have at least 6 counts, so we will loose state 2
msm_restrict_connectivity = msm.estimate_markov_model(self.dtraj, lag=1, mincount_connectivity=6, weights='oom')
self._test_connectivity(msm_one_over_n, msm_restrict_connectivity)
def setUpClass(cls):
import pyemma.datasets
cls.core_set = [34, 65]
cls.dtraj = pyemma.datasets.load_2well_discrete().dtraj_T100K_dt10
nu = 1. * np.bincount(cls.dtraj)[cls.core_set]
cls.statdist = nu / nu.sum()
cls.tau = 10
maxerr = 1e-12
warnings.filterwarnings("ignore")
with warnings.catch_warnings():
warnings.simplefilter('ignore')
cls.msmrev = estimate_markov_model(cls.dtraj,
cls.tau,
maxerr=maxerr,
core_set=cls.core_set)
cls.msmrevpi = estimate_markov_model(cls.dtraj,
cls.tau,
maxerr=maxerr,
statdist=cls.statdist,
core_set=cls.core_set)
cls.msm = estimate_markov_model(cls.dtraj,
cls.tau,
reversible=False,
maxerr=maxerr,
core_set=cls.core_set)
def test_valid_trajectory(self):
pi = np.array([0.1, 0.0, 0.9])
dtraj_invalid = np.array([1, 1, 1, 1, 1, 1, 1])
dtraj_valid = np.array([0, 2, 0, 2, 2, 0, 1, 1])
msm = estimate_markov_model(dtraj_valid, 1, statdist=pi)
self.assertTrue(np.all(msm.active_set == np.array([0, 2])))
with self.assertRaises(ValueError):
msm = estimate_markov_model(dtraj_invalid, 1, statdist=pi)
def test_msm(self):
msm_one_over_n = estimate_markov_model(self.dtraj,
lag=1,
mincount_connectivity='1/n')
msm_restrict_connectivity = estimate_markov_model(
self.dtraj,
lag=1,
mincount_connectivity=self.mincount_connectivity)
self._test_connectivity(msm_one_over_n, msm_restrict_connectivity)
def test_valid_stationary_vector(self):
dtraj = np.array([0, 0, 1, 0, 1, 2])
pi_valid = np.array([0.1, 0.9, 0.0])
pi_invalid = np.array([0.1, 0.9])
active_set = np.array([0, 1])
msm = estimate_markov_model(dtraj, 1, statdist=pi_valid)
self.assertTrue(np.all(msm.active_set == active_set))
with self.assertRaises(ValueError):
msm = estimate_markov_model(dtraj, 1, statdist=pi_invalid)
def test_valid_trajectory(self):
pi = np.array([0.1, 0.9])
dtraj_invalid = np.array([1, 1, 1, 1, 1, 1, 1])
dtraj_valid = np.array([0, 2, 0, 2, 2, 0, 1, 1])
core_set = [0, 2]
msm = estimate_markov_model(dtraj_valid, 1, statdist=pi, core_set=core_set)
self.assertTrue(np.all(msm.active_set==np.array(core_set)))
np.testing.assert_array_equal(msm.pi, pi)
with self.assertRaises(ValueError):
estimate_markov_model(dtraj_invalid, 1, statdist=pi, core_set=core_set)
def test_CK_covariances_against_MSM(self):
obs = np.eye(3) # observe every state
sta = np.eye(3) # restrict p0 to every state
cktest = self.vamp.cktest(observables=obs,
statistics=sta,
mlags=4,
show_progress=True,
n_jobs=1)
pred = cktest.predictions[1:]
est = cktest.estimates[1:]
for i, (est_, pred_) in enumerate(zip(est, pred)):
msm = estimate_markov_model(dtrajs=self.dtrajs,
lag=self.lag * (i + 1),
reversible=False)
msm_esti = (self.p0 * sta).T.dot(msm.P).dot(obs).T
msm_pred = (self.p0 * sta).T.dot(
np.linalg.matrix_power(self.msm.P, (i + 1))).dot(obs).T
np.testing.assert_allclose(np.diag(pred_),
np.diag(msm_pred),
atol=self.atol)
np.testing.assert_allclose(np.diag(est_),
np.diag(msm_esti),
atol=self.atol)
np.testing.assert_allclose(np.diag(est_),
np.diag(pred_),
atol=0.006)
def test_score_vs_MSM(self):
from pyemma.util.contexts import numpy_random_seed
with numpy_random_seed(32):
trajs_test, trajs_train = cvsplit_trajs(self.trajs)
with numpy_random_seed(32):
dtrajs_test, dtrajs_train = cvsplit_trajs(self.dtrajs)
methods = ('VAMP1', 'VAMP2', 'VAMPE')
for m in methods:
msm_train = estimate_markov_model(dtrajs=dtrajs_train,
lag=self.lag,
reversible=False)
score_msm = msm_train.score(dtrajs_test,
score_method=m,
score_k=None)
vamp_train = pyemma_api_vamp(data=trajs_train,
lag=self.lag,
dim=1.0)
score_vamp = vamp_train.score(test_data=trajs_test, score_method=m)
self.assertAlmostEqual(score_msm,
score_vamp,
places=2 if m == 'VAMPE' else 3,
msg=m)
def test_rdl_recompute(self):
""" test for issue 1301. Should recompute RDL decomposition in case of new transition matrix. """
msm = estimate_markov_model(self.dtraj, self.tau)
ev1 = msm.eigenvectors_left(2)
msm.estimate(self.dtraj, lag=self.tau + 1)
ev2 = msm.eigenvectors_left(2)
assert ev2 is not ev1
def setUpClass(cls):
N_steps = 10000
N_traj = 20
lag = 1
T = np.linalg.matrix_power(
np.array([[0.7, 0.2, 0.1], [0.1, 0.8, 0.1], [0.1, 0.1, 0.8]]), lag)
dtrajs = [generate(T, N_steps) for _ in range(N_traj)]
p0 = np.zeros(3)
p1 = np.zeros(3)
trajs = []
for dtraj in dtrajs:
traj = np.zeros((N_steps, T.shape[0]))
traj[np.arange(len(dtraj)), dtraj] = 1.0
trajs.append(traj)
p0 += traj[:-lag, :].sum(axis=0)
p1 += traj[lag:, :].sum(axis=0)
vamp = pyemma_api_vamp(trajs, lag=lag, scaling=None, dim=1.0)
msm = estimate_markov_model(dtrajs, lag=lag, reversible=False)
cls.trajs = trajs
cls.dtrajs = dtrajs
cls.lag = lag
cls.msm = msm
cls.vamp = vamp
cls.p0 = p0 / p0.sum()
cls.p1 = p1 / p1.sum()
cls.atol = np.finfo(vamp.output_type()).eps * 1000.0
def markovModel(self,
lag,
macronum,
units='frames',
sparse=False,
hmm=False):
""" Build a Markov model at a given lag time and calculate metastable states
Parameters
----------
lag : int
The lag time at which to calculate the Markov state model. The units are specified with the `units` argument.
macronum : int
The number of macrostates (metastable states) to produce
units : str
The units of lag. Can be 'frames' or any time unit given as a string.
sparse : bool
Make the transition matrix sparse. Useful if lots (> 4000) states are used for the MSM. Warning: untested.
Examples
--------
>>> model = Model(data)
>>> model.markovModel(150, 4) # 150 frames lag, 4 macrostates
"""
import pyemma.msm as msm
self._integrityCheck(markov=True)
lag = unitconvert(units, 'frames', lag, fstep=self.data.fstep)
self.lag = lag
self.msm = msm.estimate_markov_model(self.data.St.tolist(),
self.lag,
sparse=sparse)
modelflag = False
while not modelflag:
self.coarsemsm = self.msm.pcca(macronum)
if len(np.unique(self.msm.metastable_assignments)) != macronum:
macronum -= 1
logger.warning(
'PCCA returned empty macrostates. Reducing the number of macrostates to {}.'
.format(macronum))
else:
modelflag = True
if macronum < 2:
raise RuntimeError(
'Could not create even two macrostates. Please revise your clustering.'
)
self._modelid = random.random()
if hmm: # Still in development
self.hmm = self.msm.coarse_grain(self.macronum)
logger.info('{:.1f}% of the data was used'.format(
self.msm.active_count_fraction * 100))
_macroTrajectoriesReport(
self.macronum, _macroTrajSt(self.data.St, self.macro_ofcluster),
self.data.simlist)
def test_MSM_sparse(self):
msm = estimate_markov_model(self.dtraj, self.tau, sparse=True)
assert_allclose(self.dtraj, msm.discrete_trajectories_full[0])
self.assertEqual(self.tau, msm.lagtime)
assert_allclose(self.lcc_MSM, msm.largest_connected_set)
self.assertTrue(np.allclose(self.Ccc_MSM.toarray(), msm.count_matrix_active.toarray()))
self.assertTrue(np.allclose(self.C_MSM.toarray(), msm.count_matrix_full.toarray()))
self.assertTrue(np.allclose(self.P_MSM.toarray(), msm.transition_matrix.toarray()))
assert_allclose(self.mu_MSM, msm.stationary_distribution)
assert_allclose(self.ts[1:], msm.timescales(self.k - 1))
def buildMSM(self):
""" Estimate a MSM from the trajectories using a provided lagtime that
should be big enough so that the relevant processes have converged.
self.error: whether to estimate errors or not
"""
if self.error:
self.MSM_object = msm.bayesian_markov_model(self.dtrajs, self.lagtime)
else:
self.MSM_object = msm.estimate_markov_model(self.dtrajs, self.lagtime)
def main(lagtimes,
clusters_file,
disctraj,
trajs,
n_clusters,
plots_path,
save_plot,
show_plot,
lagtime_resolution=20):
if disctraj is not None:
dtraj_files = glob.glob(os.path.join(disctraj, "*traj*.disctraj"))
dtrajs = [np.loadtxt(f, dtype=int) for f in dtraj_files]
clusterCenters = np.loadtxt(clusters_file)
else:
clusteringObject = cluster.Cluster(n_clusters,
trajs,
"traj*",
alwaysCluster=False,
discretizedPath=disctraj)
if clusters_file is not None:
# only assign
clusteringObject.clusterCentersFile = clusters_file
clusteringObject.clusterTrajectories()
clusterCenters = clusteringObject.clusterCenters
dtrajs = clusteringObject.dtrajs
Q = []
for lag in lagtimes:
msm_obj = msm.estimate_markov_model(dtrajs, lag)
counts = msm_obj.count_matrix_full
Q.append(counts.diagonal() / counts.sum())
Q = np.array(Q)
print("Clusters over 0.01 metastability")
correlation_limit = 0.01
states2 = np.where(Q[-1] > correlation_limit)[0]
size2 = states2.size
if len(states2):
print(" ".join(map(str, states2)))
print("Number of clusters:", size2,
", %.2f%% of the total" % (100 * size2 / float(n_clusters)))
utilities.write_PDB_clusters(np.hstack((clusterCenters, Q[:-1].T)),
use_beta=True,
title="cluster_Q.pdb")
if plots_path is None:
plots_path = ""
else:
utilities.makeFolder(plots_path)
create_plots(Q,
plots_path,
save_plot,
show_plot,
n_clusters,
lagtimes,
threshold=2.0)
def setUpClass(cls):
import pyemma.datasets
cls.dtraj = [pyemma.datasets.load_2well_discrete().dtraj_T100K_dt10]
#assert isinstance(cls.dtraj, list)
nu = 1. * np.bincount(cls.dtraj[0])
cls.statdist = nu / nu.sum()
cls.tau = 10
cls.msmrev = estimate_markov_model(cls.dtraj, cls.tau)
cls.msmrevpi = estimate_markov_model(cls.dtraj,
cls.tau,
statdist=cls.statdist)
cls.msm = estimate_markov_model(cls.dtraj, cls.tau, reversible=False)
"""Sparse"""
cls.msmrev_sparse = estimate_markov_model(cls.dtraj,
cls.tau,
sparse=True)
cls.msmrevpi_sparse = estimate_markov_model(cls.dtraj,
cls.tau,
statdist=cls.statdist,
sparse=True)
cls.msm_sparse = estimate_markov_model(cls.dtraj,
cls.tau,
reversible=False,
sparse=True)
def setUpClass(cls):
import pyemma.datasets
cls.dtraj = pyemma.datasets.load_2well_discrete().dtraj_T100K_dt10
nu = 1. * np.bincount(cls.dtraj)
cls.statdist = nu / nu.sum()
cls.tau = 10
maxerr = 1e-12
cls.msmrev = estimate_markov_model(cls.dtraj, cls.tau, maxerr=maxerr)
cls.msmrevpi = estimate_markov_model(cls.dtraj,
cls.tau,
maxerr=maxerr,
statdist=cls.statdist)
cls.msm = estimate_markov_model(cls.dtraj,
cls.tau,
reversible=False,
maxerr=maxerr)
"""Sparse"""
cls.msmrev_sparse = estimate_markov_model(cls.dtraj,
cls.tau,
sparse=True,
maxerr=maxerr)
cls.msmrevpi_sparse = estimate_markov_model(cls.dtraj,
cls.tau,
maxerr=maxerr,
statdist=cls.statdist,
sparse=True)
cls.msm_sparse = estimate_markov_model(cls.dtraj,
cls.tau,
reversible=False,
sparse=True,
maxerr=maxerr)
def markovModel(self, lag, macronum, units='frames', sparse=False):
""" Build a Markov model at a given lag time and calculate metastable states
Parameters
----------
lag : int
The lag time at which to calculate the Markov state model. The units are specified with the `units` argument.
macronum : int
The number of macrostates (metastable states) to produce
units : str
The units of lag. Can be 'frames' or any time unit given as a string.
sparse : bool
Make the transition matrix sparse. Useful if lots (> 4000) states are used for the MSM. Warning: untested.
Examples
--------
>>> model = Model(data)
>>> model.markovModel(150, 4) # 150 frames lag, 4 macrostates
"""
import pyemma.msm as msm
self._integrityCheck(markov=True)
lag = unitconvert(units, 'frames', lag, fstep=self.data.fstep)
self.lag = lag
self.msm = msm.estimate_markov_model(self.data.St.tolist(),
self.lag,
sparse=sparse)
self.P = self.msm.transition_matrix
self.micro_ofcluster = -np.ones(self.data.K + 1, dtype=int)
self.micro_ofcluster[self.msm.active_set] = np.arange(
len(self.msm.active_set))
self.cluster_ofmicro = self.msm.active_set
self.micronum = len(self.msm.active_set)
self.coarsemsm = self.msm.pcca(macronum)
# Fixing pyemma macrostates
self.macronum = len(set(self.msm.metastable_assignments))
mask = np.ones(macronum, dtype=int) * -1
mask[list(set(self.msm.metastable_assignments))] = range(self.macronum)
self.macro_ofmicro = mask[self.msm.metastable_assignments]
self.macro_ofcluster = -np.ones(self.data.K + 1, dtype=int)
self.macro_ofcluster[self.msm.active_set] = self.macro_ofmicro
logger.info('{:.1f}% of the data was used'.format(
self.msm.active_count_fraction * 100))
self._modelid = random.random()
_macroTrajectoriesReport(
self.macronum, _macroTrajSt(self.data.St, self.macro_ofcluster),
self.data.simlist)
def test_CK_expectation_against_MSM(self):
obs = np.eye(3) # observe every state
cktest = self.vamp.cktest(observables=obs, statistics=None, mlags=4)
pred = cktest.predictions[1:]
est = cktest.estimates[1:]
for i, (est_, pred_) in enumerate(zip(est, pred)):
msm = estimate_markov_model(dtrajs=self.dtrajs, lag=self.lag*(i+1), reversible=False)
msm_esti = self.p0.T.dot(msm.P).dot(obs)
msm_pred = self.p0.T.dot(np.linalg.matrix_power(self.msm.P, (i+1))).dot(obs)
np.testing.assert_allclose(pred_, msm_pred, atol=self.atol)
np.testing.assert_allclose(est_, msm_esti, atol=self.atol)
np.testing.assert_allclose(est_, pred_, atol=0.006)
def __init__(self, molecular_topology_file, trajectory, transition_matrix, num_clusters):
# Build Markov model with PyEmma
feat = coor.featurizer(molecular_topology_file)
X = coor.load(trajectory, feat)
Y = coor.tica(X, dim=2).get_output()
k_means = coor.cluster_kmeans(Y, k=num_clusters)
centroids = get_centroids(k_means)
markov_model = msm.estimate_markov_model(kmeans.dtrajs, 100) #
previous_transition_matrix = transition_matrix
self.transition_matrix = markov_model.get_transition_matrix() # figure this out
self._is_converged = relative_entropy(self.transition_matrix, transition_matrix) < tol
def estimateMSM(trajectories, lagtime, error_est=False):
""" Estimate a MSM from the trajectories using a provided lagtime that
should be big enough so that the relevant processes have converged.
Return a MaximumLikelihoodMSM object"""
if error_est:
print "Computing msm with bayes error calc"
MSM_object = MSM.bayesian_markov_model(trajectories, lagtime)
else:
print "Computing msm with no error calc"
MSM_object = MSM.estimate_markov_model(trajectories,
lagtime,
count_mode='sliding')
return MSM_object
def lengthVsNtrajs(data, nruns, lagtime, clusters, outputFilename, cache, m,
stride):
nClusters = len(clusters)
nLags = len(lagtime)
results = np.zeros((nClusters, nLags))
results_cv = np.zeros((nClusters, nLags))
for i, cl in enumerate(clusters):
clustering = coor.cluster_kmeans(data=data,
k=cl,
max_iter=500,
stride=stride)
for j, lag in enumerate(lagtime):
if (cl, lag) in cache:
print(
"Loading cached computation for %d clusters and %d lagtime"
% (cl, lag))
results[i][j], results_cv[i][j] = cache[(cl, lag)]
with open(outputFilename, 'a') as f:
f.write("%d %d %f %f\n" %
(cl, lag, results[i][j], results_cv[i][j]))
continue
print("Computing for %d clusters and %d lagtime" % (cl, lag))
try:
MSM = msm.estimate_markov_model(clustering.dtrajs, lag)
print("MSM estimated on %d states" % MSM.nstates)
except Exception:
print("Estimation error in %d clusters, %d lagtime" %
(cl, lag))
results[i][j] = 0.0
results_cv[i][j] = 0.0
continue
try:
results[i][j] = np.mean(MSM.score(MSM.dtrajs_full, score_k=m))
except Exception:
print("Estimation error in %d clusters, %d lagtime" %
(cl, lag))
results[i][j] = 0.0
results_cv[i][j] = 0.0
continue
try:
results_cv[i][j] = np.mean(
MSM.score_cv(MSM.dtrajs_full, score_k=m, n=nruns))
except Exception:
print("Estimation error in %d clusters, %d lagtime" %
(cl, lag))
results_cv[i][j] = 0.0
with open(outputFilename, 'a') as f:
f.write("%d %d %f %f\n" %
(cl, lag, results[i][j], results_cv[i][j]))
return results, results_cv
def markovModel(self, lag, macronum):
""" Build a Markov model at a given lag time and calculate metastable states
Parameters
----------
lag : int
The lag time at which to calculate the Markov state model in frames.
macronum : int
The number of macrostates (metastable states) to produce
Examples
--------
>>> model = Model(data)
>>> model.markovModel(150, 4) # 150 frames lag, 4 macrostates
"""
import pyemma.msm as msm
self._integrityCheck(markov=True)
if not isinstance(lag, int):
lag = int(lag)
logger.warning(
'The lag given to markovModel() was not an integer. Converting to integer: {}'
.format(lag))
self.lag = lag
self.msm = msm.estimate_markov_model(self.data.St.tolist(), self.lag)
self.P = self.msm.transition_matrix
self.micro_ofcluster = -np.ones(self.data.K + 1, dtype=int)
self.micro_ofcluster[self.msm.active_set] = np.arange(
len(self.msm.active_set))
self.cluster_ofmicro = self.msm.active_set
self.micronum = len(self.msm.active_set)
self.coarsemsm = self.msm.pcca(macronum)
# Fixing pyemma macrostates
self.macronum = len(set(self.msm.metastable_assignments))
mask = np.ones(macronum, dtype=int) * -1
mask[list(set(self.msm.metastable_assignments))] = range(self.macronum)
self.macro_ofmicro = mask[self.msm.metastable_assignments]
self.macro_ofcluster = -np.ones(self.data.K + 1, dtype=int)
self.macro_ofcluster[self.msm.active_set] = self.macro_ofmicro
logger.info('{:.1f}% of the data was used'.format(
self.msm.active_count_fraction * 100))
self._modelid = random.random()
_macroTrajectoriesReport(
self.macronum, _macroTrajSt(self.data.St, self.macro_ofcluster),
self.data.simlist)
def __init__(self, topfile, trajectory, P, N):
# Build markov model with PyEmma
feat = coor.featurizer(topfile)
X = coor.load(trajectory, feat)
Y = coor.tica(X, dim=2).get_output()
k_means = coor.cluster_kmeans(Y, k=N)
centroids = get_centroids(k_means)
M = msm.estimate_markov_model(kmeans.dtrajs, 100)
# Q = n-1 transition matrix, P = n transition matrix
Q = P
self.P = M.get_transition_matrix() # figure this out
self._is_converged = relative_entropy(self.P, Q) < tol
def markovModel(self, lag, macronum, units='frames', sparse=False):
""" Build a Markov model at a given lag time and calculate metastable states
Parameters
----------
lag : int
The lag time at which to calculate the Markov state model. The units are specified with the `units` argument.
macronum : int
The number of macrostates (metastable states) to produce
units : str
The units of lag. Can be 'frames' or any time unit given as a string.
sparse : bool
Make the transition matrix sparse. Useful if lots (> 4000) states are used for the MSM. Warning: untested.
Examples
--------
>>> model = Model(data)
>>> model.markovModel(150, 4) # 150 frames lag, 4 macrostates
"""
import pyemma.msm as msm
self._integrityCheck(markov=True)
lag = unitconvert(units, 'frames', lag, fstep=self.data.fstep)
self.lag = lag
self.msm = msm.estimate_markov_model(self.data.St.tolist(), self.lag, sparse=sparse)
self.P = self.msm.transition_matrix
self.micro_ofcluster = -np.ones(self.data.K+1, dtype=int)
self.micro_ofcluster[self.msm.active_set] = np.arange(len(self.msm.active_set))
self.cluster_ofmicro = self.msm.active_set
self.micronum = len(self.msm.active_set)
self.coarsemsm = self.msm.pcca(macronum)
# Fixing pyemma macrostates
self.macronum = len(set(self.msm.metastable_assignments))
mask = np.ones(macronum, dtype=int) * -1
mask[list(set(self.msm.metastable_assignments))] = range(self.macronum)
self.macro_ofmicro = mask[self.msm.metastable_assignments]
self.macro_ofcluster = -np.ones(self.data.K+1, dtype=int)
self.macro_ofcluster[self.msm.active_set] = self.macro_ofmicro
logger.info('{:.1f}% of the data was used'.format(self.msm.active_count_fraction * 100))
self._modelid = random.random()
_macroTrajectoriesReport(self.macronum, _macroTrajSt(self.data.St, self.macro_ofcluster), self.data.simlist)
def markovModel(self, lag, macronum, units='frames', sparse=False, hmm=False):
""" Build a Markov model at a given lag time and calculate metastable states
Parameters
----------
lag : int
The lag time at which to calculate the Markov state model. The units are specified with the `units` argument.
macronum : int
The number of macrostates (metastable states) to produce
units : str
The units of lag. Can be 'frames' or any time unit given as a string.
sparse : bool
Make the transition matrix sparse. Useful if lots (> 4000) states are used for the MSM. Warning: untested.
Examples
--------
>>> model = Model(data)
>>> model.markovModel(150, 4) # 150 frames lag, 4 macrostates
"""
import pyemma.msm as msm
self._integrityCheck(markov=True)
lag = unitconvert(units, 'frames', lag, fstep=self.data.fstep)
self.lag = lag
self.msm = msm.estimate_markov_model(self.data.St.tolist(), self.lag, sparse=sparse)
modelflag = False
while not modelflag:
self.coarsemsm = self.msm.pcca(macronum)
if len(np.unique(self.msm.metastable_assignments)) != macronum:
macronum -= 1
logger.warning('PCCA returned empty macrostates. Reducing the number of macrostates to {}.'.format(macronum))
else:
modelflag = True
if macronum < 2:
raise RuntimeError('Could not create even two macrostates. Please revise your clustering.')
self._modelid = random.random()
if hmm: # Still in development
self.hmm = self.msm.coarse_grain(self.macronum)
logger.info('{:.1f}% of the data was used'.format(self.msm.active_count_fraction * 100))
_macroTrajectoriesReport(self.macronum, _macroTrajSt(self.data.St, self.macro_ofcluster), self.data.simlist)
def markovModel(self, lag, macronum):
""" Build a Markov model at a given lag time and calculate metastable states
Parameters
----------
lag : int
The lag time at which to calculate the Markov state model in frames.
macronum : int
The number of macrostates (metastable states) to produce
Examples
--------
>>> model = Model(data)
>>> model.markovModel(150, 4) # 150 frames lag, 4 macrostates
"""
import pyemma.msm as msm
self._integrityCheck(markov=True)
if not isinstance(lag, int):
lag = int(lag)
logger.warning('The lag given to markovModel() was not an integer. Converting to integer: {}'.format(lag))
self.lag = lag
self.msm = msm.estimate_markov_model(self.data.St.tolist(), self.lag)
self.P = self.msm.transition_matrix
self.micro_ofcluster = -np.ones(self.data.K+1, dtype=int)
self.micro_ofcluster[self.msm.active_set] = np.arange(len(self.msm.active_set))
self.cluster_ofmicro = self.msm.active_set
self.micronum = len(self.msm.active_set)
self.coarsemsm = self.msm.pcca(macronum)
# Fixing pyemma macrostates
self.macronum = len(set(self.msm.metastable_assignments))
mask = np.ones(macronum, dtype=int) * -1
mask[list(set(self.msm.metastable_assignments))] = range(self.macronum)
self.macro_ofmicro = mask[self.msm.metastable_assignments]
self.macro_ofcluster = -np.ones(self.data.K+1, dtype=int)
self.macro_ofcluster[self.msm.active_set] = self.macro_ofmicro
logger.info('{:.1f}% of the data was used'.format(self.msm.active_count_fraction * 100))
self._modelid = random.random()
_macroTrajectoriesReport(self.macronum, _macroTrajSt(self.data.St, self.macro_ofcluster), self.data.simlist)
def test_ck_msm(self):
MLMSM = msm.estimate_markov_model(
[self.double_well_data.dtraj_T100K_dt10_n6good], 40)
ck = MLMSM.cktest(2, mlags=[0, 1, 10])
estref = np.array([[[1., 0.], [0., 1.]],
[[0.89806859, 0.10193141], [0.10003466,
0.89996534]],
[[0.64851782, 0.35148218], [0.34411751,
0.65588249]]])
predref = np.array([[[1., 0.], [0., 1.]],
[[0.89806859, 0.10193141],
[0.10003466, 0.89996534]],
[[0.62613723, 0.37386277], [0.3669059,
0.6330941]]])
# rough agreement with MLE
assert np.allclose(ck.estimates, estref, rtol=0.1, atol=10.0)
assert ck.estimates_conf[0] is None
assert ck.estimates_conf[1] is None
assert np.allclose(ck.predictions, predref, rtol=0.1, atol=10.0)
assert ck.predictions_conf[0] is None
assert ck.predictions_conf[1] is None
def markovModel(self, lag, macronum):
""" Build a Markov model at a given lag time and calculate metastable states
Parameters
----------
lag : int
The lag time at which to calculate the Markov state model in frames.
macronum : int
The number of macrostates (metastable states) to produce
Examples
--------
>>> model = ModelHMM(data)
>>> model.markovModel(150, 4) # 150 frames lag, 4 macrostates
"""
import pyemma.msm as msm
self._integrityCheck(markov=True)
self.lag = lag
self.msm = msm.estimate_markov_model(self.data.St.tolist(), self.lag)
self.hmm = self.msm.coarse_grain(macronum)
self.micro_ofcluster = -np.ones(self.data.K + 1, dtype=int)
self.micro_ofcluster[self.msm.active_set] = np.arange(
len(self.msm.active_set))
self.cluster_ofmicro = self.msm.active_set
self.micronum = len(self.msm.active_set)
self.P = self.hmm.transition_matrix
self.macronum = np.size(self.P, 0)
# Fixing pyemma macrostates
self.macronum = len(set(self.hmm.metastable_assignments))
mask = np.ones(macronum, dtype=int) * -1
mask[list(set(self.msm.metastable_assignments))] = range(self.macronum)
self.macro_ofmicro = mask[self.hmm.metastable_assignments]
self.macro_ofcluster = -np.ones(self.data.K + 1, dtype=int)
self.macro_ofcluster[self.msm.active_set] = self.macro_ofmicro
self._modelid = random.random()
def markovModel(self, lag, macronum):
""" Build a Markov model at a given lag time and calculate metastable states
Parameters
----------
lag : int
The lag time at which to calculate the Markov state model in frames.
macronum : int
The number of macrostates (metastable states) to produce
Examples
--------
>>> model = ModelHMM(data)
>>> model.markovModel(150, 4) # 150 frames lag, 4 macrostates
"""
import pyemma.msm as msm
self._integrityCheck(markov=True)
self.lag = lag
self.msm = msm.estimate_markov_model(self.data.St.tolist(), self.lag)
self.hmm = self.msm.coarse_grain(macronum)
self.micro_ofcluster = -np.ones(self.data.K+1, dtype=int)
self.micro_ofcluster[self.msm.active_set] = np.arange(len(self.msm.active_set))
self.cluster_ofmicro = self.msm.active_set
self.micronum = len(self.msm.active_set)
self.P = self.hmm.transition_matrix
self.macronum = np.size(self.P, 0)
# Fixing pyemma macrostates
self.macronum = len(set(self.hmm.metastable_assignments))
mask = np.ones(macronum, dtype=int) * -1
mask[list(set(self.msm.metastable_assignments))] = range(self.macronum)
self.macro_ofmicro = mask[self.hmm.metastable_assignments]
self.macro_ofcluster = -np.ones(self.data.K+1, dtype=int)
self.macro_ofcluster[self.msm.active_set] = self.macro_ofmicro
self._modelid = random.random()
def test_time_units(self):
dtraj = np.random.randint(0, 4, 1000)
tau = 12
dt = 0.456
msmobj = estimate_markov_model(dtraj, lag=tau, dt_traj='%f ns' % dt)
# check MFPT consistency
mfpt_ref = msmobj.mfpt([0], [1])
tptobj = tpt(msmobj, [0], [1])
assert_allclose(tptobj.mfpt, mfpt_ref)
assert_allclose(
msmana.mfpt(msmobj.P, [1], [0], tau=tau) * dt, mfpt_ref)
assert_allclose(
np.dot(msmobj.stationary_distribution, tptobj.backward_committor) /
tptobj.total_flux, mfpt_ref)
# check flux consistency
total_flux_ref = tptobj.total_flux
A = tptobj.A
B = tptobj.B
I = tptobj.I
assert_allclose(
tptobj.gross_flux[A, :][:, B].sum() +
tptobj.gross_flux[A, :][:, I].sum(), total_flux_ref)
assert_allclose(
tptobj.net_flux[A, :][:, B].sum() +
tptobj.net_flux[A, :][:, I].sum(), total_flux_ref)
assert_allclose(
tptobj.flux[A, :][:, B].sum() + tptobj.flux[A, :][:, I].sum(),
total_flux_ref)
mf = tptobj.major_flux(1.0)
assert_allclose(mf[A, :][:, B].sum() + mf[A, :][:, I].sum(),
total_flux_ref)
# check that the coarse-grained version is consistent too
_, tptobj2 = tptobj.coarse_grain([A, I, B])
assert_allclose(tptobj2.total_flux, total_flux_ref)
assert_allclose(tptobj2.mfpt, mfpt_ref)
def estimateDG(data, nruns, cl, lag, ntraj, len_traj, skipFirstSnaphots,
cluster_each_iteration):
deltaG = []
if not cluster_each_iteration:
clustering = coor.cluster_kmeans(data=data,
k=cl,
max_iter=500,
stride=1)
for _ in range(nruns):
data_it = select_iteration_data(data, ntraj)
data_it = [data[j][skipFirstSnaphots:len_traj] for j in data_it]
if cluster_each_iteration:
clustering = coor.cluster_kmeans(data=data_it,
k=cl,
max_iter=500,
stride=1)
dtrajs = clustering.dtrajs
else:
dtrajs = clustering.assign(data_it)
try:
MSM = msm.estimate_markov_model(dtrajs, lag)
print("MSM estimated on %d states" % MSM.nstates)
except Exception:
print(
"Estimation error in %d clusters, %d lagtime, %d trajectories of %d steps"
% (cl, lag, ntraj, len_traj))
continue
pi, cl_centers = compute.ensure_connectivity(MSM,
clustering.clustercenters)
d = 0.75
bins = compute.create_box(cl_centers, data_it, d)
microstateVolume = compute.calculate_microstate_volumes_new(
cl_centers, data_it, bins, d)
_, string = compute.calculate_pmf(microstateVolume, pi)
value = float(string.split()[1])
deltaG.append(value)
return np.mean(deltaG), np.std(deltaG)
from pyemma.msm import estimate_markov_model
import numpy as np
"""
method 1
"""
#msmrev=OOMReweightedMSM(lag=150,sparse=True,reversible=False,rank_Ct='bootstrap_trajs')
#msmrev=OOMReweightedMSM(lag=150,sparse=True,reversible=False)
#tol_rank=10.0 or smaller?
#sparse=True/False
#reversible=True
"""
method2
"""
sequence=np.load('all_faked_trajs_0.npy')
dtrajs=[sequence[i] for i in range(len(sequence))]
#msmrev_fit=msmrev.fit(dtrajs)
msm = estimate_markov_model(dtrajs, lag=200, weights='oom')
np.save('msm_timescales.npy',msm.timescales())
#msm.stationary_distribution
config.show_progress_bars = False
lag = args.tica_lag
feat = coor.featurizer(topfile)
feat.add_backbone_torsions()
inp = coor.source(trajfiles, feat)
dim = args.tica_dim
tica_obj = coor.tica(inp, lag=lag, dim=dim, kinetic_map=False)
Y = tica_obj.get_output()
cl = coor.cluster_kmeans(data=Y, k=args.msm_states, stride=args.stride)
M = msm.estimate_markov_model(cl.dtrajs, args.msm_lag)
# with open("model.dtraj", "w") as f:
# f.write("\n".join(" ".join(map(str, x)) for x in cl.dtrajs))
#
# # np.savetxt("model.dtraj", cl.dtrajs, delimiter=" ", fmt='%d')
# np.savetxt("model.msm", M.P, delimiter=",")
data = {
'input': {
'frames': inp.n_frames_total(),
'dimension': inp.dimension(),
'trajectories': inp.number_of_trajectories(),
'lengths': inp.trajectory_lengths().tolist(),
},
'tica': {
def _find_omega_msm(self) -> np.ndarray:
_, bins = np.histogram(self._newcv, self._size)
newcv_ind = np.digitize(self._newcv, bins)
return msm.estimate_markov_model(
newcv_ind, self._lag_time, reversible=False
).eigenvalues()
if args.display:
pp.show()
pp.clf()
pp.close()
fig, (ax1, ax2) = pp.subplots(1,2)
ax1.scatter(cc_x, cc_y, marker='o', color='black')
ax2 = mplt.plot_free_energy(np.vstack(Y)[:,0], np.vstack(Y)[:,1], cbar_label=None)
if args.save:
pp.savefig(os.path.join(args.save_destination, 'msm_tica_all.png'))
if args.display:
pp.show()
pp.clf()
pp.close()
###
#actually generate MSM from data
msm_from_data = msm.estimate_markov_model(dtrajs=mapped_data, lag=lagtime)
#plot and/or save implied timescales, if specified
if args.timescales:
its = msm.timescales_msm(dtrajs=mapped_data, lags=500)
mplt.plot_implied_timescales(its, show_mean=False, ylog=True, dt=25, units='ps', linewidth=2)
if args.save:
pp.savefig(os.path.join(args.save_destination, 'msm_its.png'))
if args.display:
pp.show()
pp.clf()
pp.close()
####
#pcca cluster using specified n_sets
msm_from_data.pcca(n_sets)
def setUp(self):
"""Store state of the rng"""
self.state = np.random.mtrand.get_state()
"""Reseed the rng to enforce 'deterministic' behavior"""
np.random.mtrand.seed(42)
"""Meta-stable birth-death chain"""
b = 2
q = np.zeros(7)
p = np.zeros(7)
q[1:] = 0.5
p[0:-1] = 0.5
q[2] = 1.0 - 10 ** (-b)
q[4] = 10 ** (-b)
p[2] = 10 ** (-b)
p[4] = 1.0 - 10 ** (-b)
bdc = BirthDeathChain(q, p)
P = bdc.transition_matrix()
dtraj = generate_traj(P, 10000, start=0)
tau = 1
"""Estimate MSM"""
MSM = estimate_markov_model(dtraj, tau)
C_MSM = MSM.count_matrix_full
lcc_MSM = MSM.largest_connected_set
Ccc_MSM = MSM.count_matrix_active
P_MSM = MSM.transition_matrix
mu_MSM = MSM.stationary_distribution
"""Meta-stable sets"""
A = [0, 1, 2]
B = [4, 5, 6]
w_MSM = np.zeros((2, mu_MSM.shape[0]))
w_MSM[0, A] = mu_MSM[A] / mu_MSM[A].sum()
w_MSM[1, B] = mu_MSM[B] / mu_MSM[B].sum()
K = 10
P_MSM_dense = P_MSM
p_MSM = np.zeros((K, 2))
w_MSM_k = 1.0 * w_MSM
for k in range(1, K):
w_MSM_k = np.dot(w_MSM_k, P_MSM_dense)
p_MSM[k, 0] = w_MSM_k[0, A].sum()
p_MSM[k, 1] = w_MSM_k[1, B].sum()
"""Assume that sets are equal, A(\tau)=A(k \tau) for all k"""
w_MD = 1.0 * w_MSM
p_MD = np.zeros((K, 2))
eps_MD = np.zeros((K, 2))
p_MSM[0, :] = 1.0
p_MD[0, :] = 1.0
eps_MD[0, :] = 0.0
for k in range(1, K):
"""Build MSM at lagtime k*tau"""
C_MD = cmatrix(dtraj, k * tau, sliding=True) / (k * tau)
lcc_MD = largest_connected_set(C_MD)
Ccc_MD = connected_cmatrix(C_MD, lcc=lcc_MD)
c_MD = Ccc_MD.sum(axis=1)
P_MD = tmatrix(Ccc_MD).toarray()
w_MD_k = np.dot(w_MD, P_MD)
"""Set A"""
prob_MD = w_MD_k[0, A].sum()
c = c_MD[A].sum()
p_MD[k, 0] = prob_MD
eps_MD[k, 0] = np.sqrt(k * (prob_MD - prob_MD ** 2) / c)
"""Set B"""
prob_MD = w_MD_k[1, B].sum()
c = c_MD[B].sum()
p_MD[k, 1] = prob_MD
eps_MD[k, 1] = np.sqrt(k * (prob_MD - prob_MD ** 2) / c)
"""Input"""
self.MSM = MSM
self.K = K
self.A = A
self.B = B
"""Expected results"""
self.p_MSM = p_MSM
self.p_MD = p_MD
self.eps_MD = eps_MD
def initial_model_discrete(observations, nstates, lag=1, reversible=True):
"""Generate an initial model with discrete output densities
Parameters
----------
observations : list of ndarray((T_i), dtype=int)
list of arrays of length T_i with observation data
nstates : int
The number of states.
lag : int, optional, default=1
The lag time to use for initializing the model.
TODO
----
* Why do we have a `lag` option? Isn't the HMM model, by definition, lag=1 everywhere? Why would this be useful instead of just having the user subsample the data?
Examples
--------
Generate initial model for a discrete output model.
>>> from bhmm import testsystems
>>> [model, observations, states] = testsystems.generate_synthetic_observations(output_model_type='discrete')
>>> initial_model = initial_model_discrete(observations, model.nstates)
"""
# check input
if not reversible:
warnings.warn("nonreversible initialization of discrete HMM currently not supported. Using a reversible matrix for initialization.")
reversible = True
# import emma inside function in order to avoid dependency loops
from pyemma import msm
# estimate Markov model
MSM = msm.estimate_markov_model(observations, lag, reversible=True, connectivity='largest')
# PCCA
pcca = MSM.pcca(nstates)
# HMM output matrix
B_conn = MSM.metastable_distributions
#print 'B_conn = \n',B_conn
# full state space output matrix
nstates_full = MSM.count_matrix_full.shape[0]
eps = 0.01 * (1.0/nstates_full) # default output probability, in order to avoid zero columns
B = eps * np.ones((nstates,nstates_full), dtype=np.float64)
# expand B_conn to full state space
B[:,MSM.active_set] = B_conn[:,:]
# renormalize B to make it row-stochastic
B /= B.sum(axis=1)[:,None]
# coarse-grained transition matrix
M = pcca.memberships
W = np.linalg.inv(np.dot(M.T, M))
A = np.dot(np.dot(M.T, MSM.transition_matrix), M)
P_coarse = np.dot(W, A)
# symmetrize and renormalize to eliminate numerical errors
X = np.dot(np.diag(pcca.coarse_grained_stationary_probability), P_coarse)
X = 0.5 * (X + X.T)
# if there are values < 0, set to eps
X = np.maximum(X, eps)
# turn into coarse-grained transition matrix
A = X / X.sum(axis=1)[:, None]
logger().info('Initial model: ')
logger().info('transition matrix = \n'+str(A))
logger().info('output matrix = \n'+str(B.T))
# initialize HMM
# --------------
output_model = DiscreteOutputModel(B)
model = HMM(A, output_model)
return model
