def bin_sparse_dok(mgf_file,
output_file=None,
min_bin=50,
max_bin=2000,
bin_size=0.01,
verbose=False,
remove_zero_sum_rows=True,
remove_zero_sum_cols=True):
start = time.time()
bins = np.arange(min_bin, max_bin, bin_size)
reader0 = mgf.MGF(mgf_file)
n_spectra = len([x for x in reader0])
X = dok_matrix((len(bins), n_spectra), dtype=np.float32)
reader = mgf.MGF(mgf_file)
scan_names = []
for spectrum_index, spectrum in enumerate(reader):
if len(spectrum['m/z array']) == 0:
continue
for mz, intensity in zip(spectrum['m/z array'],
spectrum['intensity array']):
target_bin = math.floor((mz - min_bin) / bin_size)
X[target_bin, spectrum_index] += intensity
scan_names.append(spectrum['params']['scans'])
X = X.tocsr()
X_orig_shape = X.shape
if remove_zero_sum_rows:
print(X.shape)
X, row_names_filter = filter_zero_rows(X)
bins = [x for (x, v) in zip(bins, row_names_filter) if v]
print("Removed %s rows" %
(X_orig_shape[0] - X.shape[0])) if verbose else None
if remove_zero_sum_cols:
X, col_names_filter = filter_zero_cols(X)
scan_names = [x for (x, v) in zip(scan_names, col_names_filter) if v]
print("Removed %s cols" %
(X_orig_shape[1] - X.shape[1])) if verbose else None
if verbose:
print(
"Binned in %s seconds with dimensions %sx%s, %s nonzero entries (%s)"
% (time.time() - start, X.shape[0], X.shape[1], X.count_nonzero(),
X.count_nonzero() / (n_spectra * len(bins))))
if output_file is not None:
pkl.dump((X, bins, scan_names), open(output_file, "wb"))
return (X, bins, scan_names)
def read_mgf_cosine(mgfFile, specific_spectra=0): spectra = [] masses = [] if specific_spectra == 0: if isinstance(mgfFile, list): for mgfs_n in mgfFile: with mgf.MGF(mgfs_n) as reader: for spectrum in reader: masses.append(spectrum['params']['pepmass'][0]) temp = [] for i in range(len(spectrum['m/z array'])): temp.append([spectrum['m/z array'][i], spectrum['intensity array'][i]]) spectra.append(temp) else: with mgf.MGF(mgfFile) as reader: for spectrum in reader: masses.append(spectrum['params']['pepmass'][0]) temp = [] for i in range(len(spectrum['m/z array'])): temp.append([spectrum['m/z array'][i], spectrum['intensity array'][i]]) spectra.append(temp) else: if isinstance(mgfFile, list): for n, mgfs_n in enumerate(mgfFile): with mgf.MGF(mgfs_n) as reader: s_in_mgf = [] for s in specific_spectra: if s[0] - 1 == n: s_in_mgf.append(s[1]) for k, spectrum in enumerate(reader): for j in s_in_mgf: if k == j - 1: masses.append(spectrum['params']['pepmass'][0]) temp = [] for i in range(len(spectrum['m/z array'])): temp.append([spectrum['m/z array'][i], spectrum['intensity array'][i]]) spectra.append(temp) else: with mgf.MGF(mgfFile) as reader: for k, spectrum in enumerate(reader): for j in specific_spectra: if k == j - 1: masses.append(spectrum['params']['pepmass'][0]) temp = [] for i in range(len(spectrum['m/z array'])): temp.append([spectrum['m/z array'][i], spectrum['intensity array'][i]]) spectra.append(temp) return spectra, masses
def _create_parser(self):
if self._use_index:
return _MGFParser(self.source_file,
read_charges=False,
convert_arrays=1,
encoding=self.encoding)
return mgf.MGF(self.source_file,
read_charges=False,
convert_arrays=1,
encoding=self.encoding)
def get_rt(file_location):
#returns a dictionary mapping each scan to the RT
retention_times = {}
with open(file_location, 'r') as f:
reader = mgf.MGF(f)
for spec in reader:
rt = spec['params']['rtinseconds']
scan = spec['params']['scans']
assert (scan not in retention_times)
retention_times[scan] = rt
return retention_times
def _create_parser(self):
if self._use_index:
return _MGFParser(self.source_file,
read_charges=False,
convert_arrays=1,
encoding=self.encoding)
simple_reader = mgf.MGF(self.source_file,
read_charges=False,
convert_arrays=1,
encoding=self.encoding)
simple_reader.index = OffsetIndex()
return simple_reader
def read_mgf_iterative(self):
# xtandem default spectrum parameter:
# spectrum, minimum fragment mz Mfmin = 200 -> peaks caused by individual amino acid residues tend to be relatively small (m/z < 200)
# spectrum, minimum peaks = 5 -> screen out spectra that contain too few fragment ions to be usefully interpreted.
# spectrum, minimum parent m+h (mass + proton) = 850 -> supress the analysis of spectra that were generated by low mass parent ions
# -> This parameter is not used if the value of spectrum, use noise suppression = no = default
# spectrum, dynamic range = 100 -> threshold peaks, highest normalized intensity values to 100, all others linear scaled down, if peak<1 rejected
# {'params':
# {title 'Run1_U1_2000ng.5651.5651.4 File:"Run1_U1_2000ng.raw", NativeID:"controllerType=0 controllerNumber=1 scan=5651"',
# 'rtinseconds': int, 'pepmass': (423.71 (mass), 694374.1875(intensity)), 'charge': [int] },
# 'm/z array': [np array], 'intensity array': [np array], 'charged array':[masked array]
# searchgui xtandem param "dynamicRange": 100.0,
# "nPeaks": 50,
# "minPrecursorMass": 500.0,
# "minFragmentMz": 200.0,
# "minPeaksPerSpectrum": 5,
# "useNoiseSuppression": false,
# default settings: passing spectra = 163113
# without charge one: passing spectra = 88666 (xtandem used 88279)
reader = mgf.MGF(source=self.spectra_file, use_header=True, convert_arrays=2, read_charges=True, dtype=None,
encoding='utf-8', read_ions=False)
removed_spectra= set()
number_of_spectra=0
for spectrum in reader:
number_of_spectra+=1
charge = 1 if 'charge' not in spectrum['params'].keys() else int(spectrum['params']['charge'][0])
if charge == 1:
removed_spectra.add(spectrum['params']['title'])
elif len(spectrum['m/z array']) < 5:
removed_spectra.add(spectrum['params']['title'])
elif charge > 4:
removed_spectra.add(spectrum['params']['title'])
# elif int(spectrum['params']['pepmass'][0]) < 500: # not used since "useNoiseSuppression": false,
# removed_spectra.append(spectrum['params']['title']) # passing spectra:
else:
intensity_peaks = self.remove_peaks(spectrum['intensity array'], mz_min=200, dynamic_range=100)
if len(intensity_peaks) < 5:
removed_spectra.add(spectrum['params']['title'])
# try:
# if int(spectrum['params']['pepmass'][0]) < 850:
# removed_spectra.append(spectrum['params']['title'])
# except TypeError: # None
# pass
print(f"Number of spectra: {number_of_spectra}")
print(f"Number of spectra not passing quality control: {len(removed_spectra)}")
print(f"Number of spectra passing quality control: {number_of_spectra-len(removed_spectra)}")
def read_mgf(self,
mgf_filename: Union[str, None] = None,
no_new_psms: bool = False):
"""Read retention times from MGF file."""
if not mgf_filename:
mgf_filename = self.get_mgf_filename()
with mgf.MGF(mgf_filename) as reader:
for spectrum in reader:
scan = int(spectrum["params"]["scans"])
retention_time = float(spectrum["params"]["rtinseconds"])
if scan not in self.peptide_spectrum_matches:
if not no_new_psms:
psm = PeptideSpectrumMatch(
scan=scan, retention_time=retention_time)
self.peptide_spectrum_matches[scan] = psm
else:
self.peptide_spectrum_matches[
scan].retention_time = retention_time
def get_spectra(source: Union[IO, str], scan_nrs: Sequence[int] = None)\
-> Iterator[MsmsSpectrum]:
"""
Get the MS/MS spectra from the given MGF file, optionally filtering by
scan number.
Parameters
----------
source : Union[IO, str]
The MGF source (file name or open file object) from which the spectra
are read.
scan_nrs : Sequence[int]
Only read spectra with the given scan numbers. If `None`, no filtering
on scan number is performed.
Returns
-------
Iterator[MsmsSpectrum]
An iterator over the requested spectra in the given file.
"""
with mgf.MGF(source) as f_in:
# Iterate over a subset of spectra filtered by scan number.
if scan_nrs is not None:
def spectrum_it():
for scan_nr, spectrum_dict in enumerate(f_in):
if scan_nr in scan_nrs:
yield spectrum_dict
# Or iterate over all MS/MS spectra.
else:
def spectrum_it():
yield from f_in
for spectrum in spectrum_it():
try:
yield _parse_spectrum(spectrum)
except ValueError as e:
pass
for mgf_set_object in mgf_sets:
name = mgf_set_object.name
mgf_objects = mgf_set_object.mgfs
psm_parent_names = mgf_set_object.psm_parent_names
fieldnames = ['left', 'center', 'right']
for mgf_object in mgf_objects:
mgf_basename = os.path.basename(mgf_object.path)
fieldnames.append(mgf_basename)
fieldnames.extend([mgf_basename + '-' + x for x in psm_parent_names])
histograms = []
for mgf_object in mgf_objects:
mgf_basename = os.path.basename(mgf_object.path)
spectra = {}
mgf_masses = []
with open(mgf_object.path, 'r') as g:
spec_iter = mgf.MGF(g)
for x in spec_iter:
assert ('scans' in x['params'])
assert (isinstance(x['params']['scans'], str))
spectra[x['params']['scans']] = Spectrum(
x['params']['pepmass'][0], x['params']['charge'][0])
mgf_masses.append(x['params']['pepmass'][0] *
x['params']['charge'][0])
mgf_masses.sort()
unnormalized_hist, hist, temp_bin_centers, temp_bin_edges = create_hist(
mgf_masses, num_bins, min_mass, max_mass)
if bin_centers is None and bin_edges is None:
bin_centers = list(temp_bin_centers)
bin_edges = list(temp_bin_edges)
assert (len(bin_centers) + 1 == len(bin_edges))
hist = MassHist(mgf_basename, list(unnormalized_hist))
from pyteomics import mgf
import pandas as pd
from rdkit import Chem
from rdkit.Chem import Descriptors
import sys
# 'NIST_GC_EI_MAX_LIBRARY.mgf'
if __name__=='__main__':
filename = sys.argv[1]
spectra = []
with mgf.MGF(filename) as reader:
for spectrum in reader:
temp = {}
inchi = spectrum['params'].get('inchi')
if inchi!=None:
mol = Chem.MolFromInchi(spectrum['params'].get('inchi'))
else:
mol = None
temp['FILENAME'] = filename
temp['SEQ'] = '*..*'
temp['COMPOUND_NAME'] = spectrum['params'].get('name')
try:
temp['MOLECULEMASS'] = Descriptors.MolWt(mol)
except:
temp['MOLECULEMASS'] = 'N/A'
temp['INSTRUMENT'] = spectrum['params'].get('instrument')
temp['IONSOURCE'] = spectrum['params'].get('source_instrument')
temp['EXTRACTSCAN'] = spectrum['params'].get('scans')
temp['SMILES'] = spectrum['params'].get('smiles')
temp['INCHI'] = spectrum['params'].get('inchi')
scan_names = [x for (x, v) in zip(scan_names, col_names_filter) if v]
print("Removed %s cols" % (X_orig_shape[1] - X.shape[1] )) if verbose else None
if verbose:
print("Binned in %s seconds with dimensions %sx%s, %s nonzero entries (%s)" % (time.time()-start, X.shape[0], X.shape[1], X.count_nonzero(), X.count_nonzero()/(n_scans*len(bins))))
if output_file is not None:
pkl.dump((X, bins, scan_names),open( output_file, "wb"))
return(X, bins, scan_names)
def row_filter_intensity(X, bin_names, threshold = 1/1000):
colsums = np.array(X.sum(axis = 0)).flatten()
for i in range(X.shape[1]):
X[:, i] = X[:, i]/colsums[i]
rowsums = np.array(X.sum(axis = 1)).flatten()
rowkeep = rowsums > threshold
X = X[rowkeep, :]
bin_names = [x for (x, v) in zip(bin_names, rowkeep) if v]
return((X, bin_names))
files = ["BILELIB19.mgf", "GNPS-NIH-CLINICALCOLLECTION1.mgf"]
all_spectra = []
for f in files:
content = mgf.MGF(f)
for spectra in content:
if spectra['params']["source_instrument"].find("qT") > 0:
all_spectra.append(spectra)
bin_sparse_dok(mgf = all_spectra, verbose = True, bin_size = 0.1, output_file = "metabolite_matrix.pkl")
def bin_sparse_dok(mgf_file=None, mgf_files=None, output_file = None, min_bin = 50, max_bin = 850, bin_size = 0.01, max_parent_mass = 850, verbose = False, remove_zero_sum_rows = True, remove_zero_sum_cols = True, window_filter = True, filter_window_size = 50, filter_window_retain = 3, filter_parent_peak = True):
""" Bins an mgf file
Bins an mgf of ms2 spectra and returns a sparse dok matrix. Operates on either a single or a list of mgf files.
Args:
mgf_file: The path of an mgf file.
mgf_files: A list of mgf files.
output_file = Name of output file in pickle format.
min_bin = smallest m/z value to be binned.
max_bin = largest m/z value to be binned.
bin_size: M/z range in one bin.
max_parent_mass: Remove ions larger than this.
verbose: Print debug info.
remove_zero_sum_rows: Explicitly remove empty rows (bins).
remove_zero_sum_cols: Explicitly remove spectra were all values were filtered away (columns)
filter_parent_peak: Remove all ms2 peaks larger than the parent mass
returns:
A sparse dok matrix X, a list of bin names, and a list of spectra names
"""
start = time.time()
bins = np.arange(min_bin, max_bin, bin_size)
if mgf_file != None:
mgf_files = [mgf_file]
n_scans = 0
for file in mgf_files:
reader0 = mgf.MGF(file)
n_scans += len([x for x in reader0])
X = dok_matrix((len(bins), n_scans), dtype=np.float32)
scan_names = []
for file in mgf_files:
reader = mgf.MGF(file)
base = os.path.basename(file)
for spectrum_index, spectrum in enumerate(reader):
scan_names.append(os.path.splitext(base)[0] + "_" + spectrum['params']['scans'])
if spectrum['params']['pepmass'][0] > max_parent_mass:
continue
if len(spectrum['m/z array']) == 0:
continue
if window_filter:
spectrum = filter_window(spectrum, filter_window_size, filter_window_retain)
for mz, intensity in zip(spectrum['m/z array'], spectrum['intensity array']):
if mz > max_bin or mz > spectrum['params']['pepmass'][0]:
continue
target_bin = math.floor((mz - min_bin)/bin_size)
X[target_bin-1, spectrum_index] += intensity
X = X.tocsr()
X_orig_shape = X.shape
if remove_zero_sum_rows:
print(X.shape)
X, row_names_filter = filter_zero_rows(X)
bins = [x for (x, v) in zip(bins, row_names_filter) if v]
print("Removed %s rows" % (X_orig_shape[0] - X.shape[0] )) if verbose else None
if remove_zero_sum_cols:
X, col_names_filter = filter_zero_cols(X)
scan_names = [x for (x, v) in zip(scan_names, col_names_filter) if v]
print("Removed %s cols" % (X_orig_shape[1] - X.shape[1] )) if verbose else None
if verbose:
print("Binned in %s seconds with dimensions %sx%s, %s nonzero entries (%s)" % (time.time()-start, X.shape[0], X.shape[1], X.count_nonzero(), X.count_nonzero()/(n_scans*len(bins))))
if output_file is not None:
pkl.dump((X, bins, scan_names),open( output_file, "wb"))
return(X, bins, scan_names)
#!/usr/bin/env python3
from pyteomics import mgf
import numpy as np
import pandas as pd
import os
bin_number = 3000
mz_range = (0, 1200)
bins = np.linspace(mz_range[0], mz_range[1], num=bin_number)
mgf_data = ['./data/agp500.mgf']
reader = [(os.path.basename(x), mgf.MGF(x)) for x in mgf_data]
spectra_bins = {}
for (name, mgfs) in reader:
for index, m in enumerate([x for x in mgfs]):
spectra_bins[name + "_" + str(m['params']['scans'])] = np.digitize(
m["m/z array"], bins)
matrix = pd.DataFrame(0, index=bins, columns=spectra_bins.keys())
colnames = []
print(matrix.shape)
for k, v in spectra_bins.items():
colnames.append(k)
for i in v:
# print(i,k)
matrix.iloc[i - 1].loc[k] = 1
print(matrix.shape)
matrix = matrix[(matrix.T != 0).any()]
