void DetectabilitySimulation::svmFilter_(FeatureMapSim& features)
{
// transform featuremap to peptides vector
vector<String> peptides_vector(features.size());
for (Size i = 0; i < features.size(); ++i)
{
peptides_vector[i] = features[i].getPeptideIdentifications()[0].getHits()[0].getSequence().toUnmodifiedString();
}
vector<DoubleReal> labels;
vector<DoubleReal> detectabilities;
predictDetectabilities(peptides_vector, labels, detectabilities);
// copy all meta data stored in the feature map
FeatureMapSim temp_copy(features);
temp_copy.clear(false);
for (Size i = 0; i < peptides_vector.size(); ++i)
{
if (detectabilities[i] > min_detect_)
{
features[i].setMetaValue("detectability", detectabilities[i]);
temp_copy.push_back(features[i]);
}
#ifdef DEBUG_SIM
cout << detectabilities[i] << " " << min_detect_ << endl;
#endif
}
features.swap(temp_copy);
}
void RTSimulation::noRTColumn_(FeatureMapSim& features)
{
for (FeatureMapSim::iterator it_f = features.begin(); it_f != features.end();
++it_f)
{
(*it_f).setRT(-1);
}
}
void DetectabilitySimulation::noFilter_(FeatureMapSim& features)
{
// set detectibility to 1.0 for all given peptides
DoubleReal defaultDetectibility = 1.0;
for (FeatureMapSim::iterator feature_it = features.begin();
feature_it != features.end();
++feature_it)
{
(*feature_it).setMetaValue("detectability", defaultDetectibility);
}
}
void RTSimulation::predictContaminantsRT(FeatureMapSim& contaminants)
{
// iterate of feature map
for (Size i = 0; i < contaminants.size(); ++i)
{
// assign random retention time
SimCoordinateType retention_time = gsl_ran_flat(rnd_gen_->technical_rng, 0, total_gradient_time_);
contaminants[i].setRT(retention_time);
}
}
void BaseLabeler::recomputeConsensus_(const FeatureMapSim & simulated_features)
{
// iterate over all given features stored in the labeling consensus and try to find the corresponding feature in
// in the feature map
// build index for faster access
Map<String, IntList> id_map;
Map<UInt64, Size> features_per_labeled_map;
for (Size i = 0; i < simulated_features.size(); ++i)
{
if (simulated_features[i].metaValueExists("parent_feature"))
{
LOG_DEBUG << "Checking [" << i << "]: " << simulated_features[i].getPeptideIdentifications()[0].getHits()[0].getSequence().toString()
<< " with charge " << simulated_features[i].getCharge() << " (" << simulated_features[i].getMetaValue("charge_adducts") << ")"
<< " parent was " << simulated_features[i].getMetaValue("parent_feature") << std::endl;
id_map[simulated_features[i].getMetaValue("parent_feature")].push_back((Int)i);
UInt64 map_index = 0;
if (simulated_features[i].metaValueExists("map_index"))
{
map_index = simulated_features[i].getMetaValue("map_index");
}
++features_per_labeled_map[map_index];
}
}
for (Map<String, IntList>::iterator it = id_map.begin(); it != id_map.end(); ++it)
{
LOG_DEBUG << it->first << " " << it->second << std::endl;
}
// new consensus map
ConsensusMap new_cm;
// initialize submaps in consensus map
for (Map<UInt64, Size>::Iterator it = features_per_labeled_map.begin(); it != features_per_labeled_map.end(); ++it)
{
new_cm.getFileDescriptions()[it->first].size = it->second;
new_cm.getFileDescriptions()[it->first].unique_id = simulated_features.getUniqueId();
}
for (ConsensusMap::iterator cm_iter = consensus_.begin(); cm_iter != consensus_.end(); ++cm_iter)
{
bool complete = true;
LOG_DEBUG << "Checking consensus feature containing: " << std::endl;
// check if we have all elements of current CF in the new feature map (simulated_features)
for (ConsensusFeature::iterator cf_iter = (*cm_iter).begin(); cf_iter != (*cm_iter).end(); ++cf_iter)
{
complete &= id_map.has(String((*cf_iter).getUniqueId()));
LOG_DEBUG << "\t" << String((*cf_iter).getUniqueId()) << std::endl;
}
if (complete)
{
// get all elements sorted by charge state; since the same charge can be achieved by different
// adduct compositions we use the adduct-string as indicator to find the groups
Map<String, std::set<FeatureHandle, FeatureHandle::IndexLess> > charge_mapping;
for (ConsensusFeature::iterator cf_iter = (*cm_iter).begin(); cf_iter != (*cm_iter).end(); ++cf_iter)
{
IntList feature_indices = id_map[String((*cf_iter).getUniqueId())];
for (IntList::iterator it = feature_indices.begin(); it != feature_indices.end(); ++it)
{
UInt64 map_index = 0;
if (simulated_features[*it].metaValueExists("map_index"))
{
map_index = simulated_features[*it].getMetaValue("map_index");
}
if (charge_mapping.has(simulated_features[*it].getMetaValue("charge_adducts")))
{
charge_mapping[simulated_features[*it].getMetaValue("charge_adducts")].insert(FeatureHandle(map_index, simulated_features[*it]));
}
else
{
LOG_DEBUG << "Create new set with charge composition " << simulated_features[*it].getMetaValue("charge_adducts") << std::endl;
std::set<FeatureHandle, FeatureHandle::IndexLess> fh_set;
fh_set.insert(FeatureHandle(map_index, simulated_features[*it]));
charge_mapping.insert(std::make_pair(simulated_features[*it].getMetaValue("charge_adducts"), fh_set));
}
}
}
// create new consensus feature from derived features (separated by charge, if charge != 0)
for (Map<String, std::set<FeatureHandle, FeatureHandle::IndexLess> >::const_iterator charge_group_it = charge_mapping.begin();
charge_group_it != charge_mapping.end();
++charge_group_it)
{
ConsensusFeature cf;
cf.setCharge((*(*charge_group_it).second.begin()).getCharge());
cf.setMetaValue("charge_adducts", charge_group_it->first);
std::vector<PeptideIdentification> ids;
for (std::set<FeatureHandle, FeatureHandle::IndexLess>::const_iterator fh_it = (charge_group_it->second).begin(); fh_it != (charge_group_it->second).end(); ++fh_it)
{
cf.insert(*fh_it);
// append identifications
Size f_index = simulated_features.uniqueIdToIndex(fh_it->getUniqueId());
std::vector<PeptideIdentification> ids_feature = simulated_features[f_index].getPeptideIdentifications();
ids.insert(ids.end(), ids_feature.begin(), ids_feature.end());
}
cf.computeMonoisotopicConsensus();
cf.setPeptideIdentifications(ids);
new_cm.push_back(cf);
}
}
}
new_cm.setProteinIdentifications(simulated_features.getProteinIdentifications());
consensus_.swap(new_cm);
consensus_.applyMemberFunction(&UniqueIdInterface::ensureUniqueId);
}
void RTSimulation::calculateMT_(FeatureMapSim& features, std::vector<DoubleReal>& predicted_retention_times)
{
Map<String, double> q_cterm, q_nterm, q_aa_basic, q_aa_acidic;
getChargeContribution_(q_cterm, q_nterm, q_aa_basic, q_aa_acidic);
DoubleReal alpha = param_.getValue("CE:alpha");
bool auto_scale = (param_.getValue("auto_scale") == "true");
DoubleReal c = (auto_scale ? 1 : (DoubleReal)param_.getValue("CE:lenght_d") * (DoubleReal)param_.getValue("CE:length_total") / (DoubleReal)param_.getValue("CE:voltage"));
predicted_retention_times.resize(features.size());
for (Size i = 0; i < features.size(); ++i)
{
String seq = features[i].getPeptideIdentifications()[0].getHits()[0].getSequence().toUnmodifiedString();
// ** determine charge of peptide **
DoubleReal charge = 0;
// C&N term charge contribution
if (q_nterm.has(seq[0]))
charge += q_nterm[seq[0]];
if (q_cterm.has(seq.suffix(1)))
charge += q_cterm[seq.suffix(1)];
// sidechains ...
Map<String, Size> frequency_table;
features[i].getPeptideIdentifications()[0].getHits()[0].getSequence().getAAFrequencies(frequency_table);
for (Map<String, Size>::const_iterator it = frequency_table.begin(); it != frequency_table.end(); ++it)
{
if (q_aa_basic.has(it->first))
charge += q_aa_basic[it->first] * it->second;
if (q_aa_acidic.has(it->first))
charge += q_aa_acidic[it->first] * it->second;
}
// ** determine mass of peptide
DoubleReal mass = features[i].getPeptideIdentifications()[0].getHits()[0].getSequence().getFormula().getAverageWeight();
// ** mobility (mu = mu_ep + mu_eo = (q/MW^alpha) + mu_eo
DoubleReal mu = (charge / std::pow(mass, alpha)) + (auto_scale ? 0 : (DoubleReal)param_.getValue("CE:mu_eo"));
predicted_retention_times[i] = c / mu; // this is L_d*L_t / (mu * V) as "c = L_d*L_t/V"
}
// ** only when Auto-Scaling is active ** /
std::vector<DoubleReal> rt_sorted(predicted_retention_times);
std::sort(rt_sorted.begin(), rt_sorted.end());
DoubleReal max_rt = rt_sorted.back();
if (auto_scale)
{
max_rt = 1; // highest will be scaled to 1
//std::cerr << "minRT: " << rt_sorted[0] << " max: " << rt_sorted.back() << "\n";
// normalize to 5th - 95th percentile (we want to avoid that few outliers with huge/small MT can compress the others to a small MT range):
DoubleReal mt_5p = rt_sorted[rt_sorted.size() * 5 / 100];
DoubleReal mt_95p = rt_sorted[rt_sorted.size() * 95 / 100];
// ... assume 95% MT range at 95th percentile
DoubleReal range = std::max(1.0, (mt_95p - mt_5p) * 0.9);
//std::cerr << " 5% MT: " << mt_5p << ", 95% MT: " << mt_95p << " Range: " << range << "\n";
DoubleReal new_offset = mt_5p - range * 0.05;
// scale MT's between 0 and 1 (except for outliers --> which will get <0 or >1)
for (Size i = 0; i < features.size(); ++i)
{
predicted_retention_times[i] = (predicted_retention_times[i] - new_offset) / range;
}
}
// the width factor is 1.0 at MT=0 and reaches its max (default 2.0) at MT=max
DoubleReal rt_widening_max = 2.0;
for (Size i = 0; i < features.size(); ++i)
{
features[i].setMetaValue("RT_CE_width_factor", (predicted_retention_times[i] / max_rt * (rt_widening_max - 1) + 1));
}
}
/**
@brief Gets a feature map containing the peptides and predicts for those the retention times
*/
void RTSimulation::predictRT(FeatureMapSim& features)
{
LOG_INFO << "RT Simulation ... started" << std::endl;
vector<DoubleReal> predicted_retention_times;
bool is_relative = (param_.getValue("auto_scale") == "true");
if (param_.getValue("rt_column") == "none")
{
noRTColumn_(features);
return;
}
// CE or HPLC:
else if (param_.getValue("rt_column") == "CE")
{
calculateMT_(features, predicted_retention_times);
}
else if (param_.getValue("rt_column") == "HPLC")
{
vector<AASequence> peptides_aa_vector(features.size());
for (Size i = 0; i < features.size(); ++i)
{
peptides_aa_vector[i] = features[i].getPeptideIdentifications()[0].getHits()[0].getSequence();
}
wrapSVM(peptides_aa_vector, predicted_retention_times);
}
// rt error dicing
SimCoordinateType rt_offset = param_.getValue("variation:affine_offset");
SimCoordinateType rt_scale = param_.getValue("variation:affine_scale");
SimCoordinateType rt_ft_stddev = param_.getValue("variation:feature_stddev");
FeatureMapSim fm_tmp(features);
fm_tmp.clear(false);
StringList deleted_features;
for (Size i = 0; i < predicted_retention_times.size(); ++i)
{
// relative -> absolute RT's (with border)
if (is_relative)
{
predicted_retention_times[i] *= total_gradient_time_;
}
//overwrite RT (if given by user)
if (features[i].metaValueExists("rt"))
{
predicted_retention_times[i] = features[i].getMetaValue("rt");
}
// add variation
SimCoordinateType rt_error = gsl_ran_gaussian(rnd_gen_->technical_rng, rt_ft_stddev) + rt_offset;
predicted_retention_times[i] = predicted_retention_times[i] * rt_scale + rt_error;
//overwrite RT [no randomization] (if given by user)
if (features[i].metaValueExists("RT"))
{
predicted_retention_times[i] = features[i].getMetaValue("RT");
}
// remove invalid peptides & (later) display removed ones
if (
(predicted_retention_times[i] < 0.0) || // check for invalid RT
(predicted_retention_times[i] > gradient_max_) || // check if RT is not in scan window
(predicted_retention_times[i] < gradient_min_) // check if RT is not in scan window
)
{
deleted_features.push_back(features[i].getPeptideIdentifications()[0].getHits()[0].getSequence().toUnmodifiedString() + " [" +
String::number(predicted_retention_times[i], 2)
+ "]");
continue;
}
features[i].setRT(predicted_retention_times[i]);
// determine shape parameters for EGH
DoubleReal variance = egh_variance_location_ + (egh_variance_scale_ == 0 ? 0 : gsl_ran_cauchy(rnd_gen_->technical_rng, egh_variance_scale_));
DoubleReal tau = egh_tau_location_ + (egh_tau_scale_ == 0 ? 0 : gsl_ran_cauchy(rnd_gen_->technical_rng, egh_tau_scale_));
// resample variance if it is below 0
// try this only 10 times to avoid endless loop in case of
// a bad parameter combination
Size retry_variance_sampling = 0;
while ((variance <= 0 || (fabs(variance - egh_variance_location_) > 10 * egh_variance_scale_)) && retry_variance_sampling < 9)
{
variance = egh_variance_location_ + gsl_ran_cauchy(rnd_gen_->technical_rng, egh_variance_scale_);
++retry_variance_sampling;
}
if (variance <= 0 || (fabs(variance - egh_variance_location_) > 10 * egh_variance_scale_))
{
LOG_ERROR << "Sigma^2 was negative, resulting in a feature with width=0. Tried to resample 10 times and then stopped. Setting it to the user defined width value of " << egh_variance_location_ << "!" << std::endl;
variance = egh_variance_location_;
}
// resample tau if the value is to big
// try this only 10 times to avoid endless loop in case of
// a bad parameter combination
Size retry_tau_sampling = 0;
while (fabs(tau - egh_tau_location_) > 10 * egh_tau_scale_ && retry_tau_sampling < 9)
{
tau = egh_tau_location_ + gsl_ran_cauchy(rnd_gen_->technical_rng, egh_tau_scale_);
++retry_tau_sampling;
}
if (fabs(tau - egh_tau_location_) > 10 * egh_tau_scale_)
{
LOG_ERROR << "Tau is to big for a reasonable feature. Tried to resample 10 times and then stopped. Setting it to the user defined skewness value of " << egh_tau_location_ << "!" << std::endl;
tau = egh_tau_location_;
}
features[i].setMetaValue("RT_egh_variance", variance);
features[i].setMetaValue("RT_egh_tau", tau);
fm_tmp.push_back(features[i]);
}
// print invalid features:
if (deleted_features.size() > 0)
{
LOG_WARN << "RT prediction gave 'invalid' results for " << deleted_features.size() << " peptide(s), making them unobservable.\n";
if (deleted_features.size() < 100)
LOG_WARN << " " << ListUtils::concatenate(deleted_features, "\n ") << std::endl;
else
LOG_WARN << " (List is too big to show)" << std::endl;
}
// only retain valid features:
features.swap(fm_tmp);
features.sortByPosition();
features.updateRanges();
}
