def write_reaction_by_index(self, r):
sparse = dict([(cid, self.S[i, r]) for i, cid in enumerate(self.cids)
if self.S[i, r] != 0])
if self.rids is not None:
reaction = KeggReaction(sparse, rid=self.rids[r])
else:
reaction = KeggReaction(sparse)
return reaction.write_formula()
def from_formulas(reaction_strings,
arrow='<=>',
has_reaction_ids=False,
raise_exception=False):
"""
parses a list of reactions in KEGG format
Arguments:
reaction_strings - a list of reactions in KEGG format
arrow - the string used as the 'arrow' in each reaction (default: '<=>')
has_reaction_ids - a boolean flag indicating if there is a column of
reaction IDs (separated from the reaction with
whitespaces)
Return values:
S - a stoichiometric matrix
cids - the KEGG compound IDs in the same order as the rows of S
"""
try:
reactions = []
not_balanced_count = 0
for line in reaction_strings:
rid = None
if has_reaction_ids:
tokens = re.findall('(\w+)\s+(.*)', line.strip())[0]
rid = tokens[0]
line = tokens[1]
try:
reaction = KeggReaction.parse_formula(line, arrow, rid)
except KeggParseException as e:
logging.warning(str(e))
reaction = KeggReaction({})
if not reaction.is_balanced(fix_water=True,
raise_exception=raise_exception):
not_balanced_count += 1
logging.warning('Model contains an unbalanced reaction: ' +
line)
reaction = KeggReaction({})
reactions.append(reaction)
logging.debug('Adding reaction: ' + reaction.write_formula())
if not_balanced_count > 0:
warning_str = '%d out of the %d reactions are not chemically balanced' % \
(not_balanced_count, len(reaction_strings))
logging.debug(warning_str)
return KeggModel.from_kegg_reactions(reactions, has_reaction_ids)
except ValueError as e:
if raise_exception:
raise e
else:
logging.debug(str(e))
return None
def add_thermo(self, cc):
# check that all CIDs in the reaction are already cached by CC
Nc, Nr = self.S.shape
reactions = []
for j in xrange(Nr):
sparse = {
self.cids[i]: self.S[i, j]
for i in xrange(Nc) if self.S[i, j] != 0
}
reaction = KeggReaction(sparse)
reactions.append(reaction)
self.dG0, self.cov_dG0 = cc.get_dG0_r_multi(reactions)
def read_redox():
"""Read the Reduction potential data"""
fname, weight = TrainingData.FNAME_DICT['REDOX']
# columns are: reaction, dG'0, T, I, pH, pMg, weight, balance?
thermo_params = []
# fields are: name, CID_ox, nH_ox, charge_ox, CID_red,
# nH_red, charge_red, E'0, pH, I, pMg, T, ref
for row in csv.DictReader(open(fname, 'r'), delimiter='\t'):
cid_ox = int(row['CID_ox'])
cid_red = int(row['CID_red'])
delta_nH = TrainingData.str2double(row['nH_red']) - \
TrainingData.str2double(row['nH_ox'])
delta_charge = TrainingData.str2double(row['charge_red']) - \
TrainingData.str2double(row['charge_ox'])
delta_e = delta_nH - delta_charge
dG0_prime = -F * TrainingData.str2double(row['E\'0']) * delta_e
thermo_params.append({
'reaction':
KeggReaction({
cid_ox: -1,
cid_red: 1
}),
'dG\'0':
dG0_prime,
'T':
TrainingData.str2double(row['T']),
'I':
TrainingData.str2double(row['I']),
'pH':
TrainingData.str2double(row['pH']),
'pMg':
TrainingData.str2double(row['pMg']),
'weight':
weight,
'balance':
False
})
logging.info('Successfully added %d redox potentials' %
len(thermo_params))
return thermo_params
def read_formations():
"""Read the Formation Energy data"""
fname, weight = TrainingData.FNAME_DICT['FORMATION']
# columns are: reaction, dG'0, T, I, pH, pMg, weight, balance?
thermo_params = []
cids_that_dont_decompose = set()
# fields are: cid, name, dG'0, pH, I, pMg, T, decompose?,
# compound_ref, remark
for row in csv.DictReader(open(fname, 'r'), delimiter='\t'):
cid = int(row['cid'])
if int(row['decompose']) == 0:
cids_that_dont_decompose.add(cid)
if row['dG\'0'] != '':
thermo_params.append({
'reaction':
KeggReaction({cid: 1}),
'dG\'0':
TrainingData.str2double(row['dG\'0']),
'T':
TrainingData.str2double(row['T']),
'I':
TrainingData.str2double(row['I']),
'pH':
TrainingData.str2double(row['pH']),
'pMg':
TrainingData.str2double(row['pMg']),
'weight':
weight,
'balance':
False
})
logging.info('Successfully added %d formation energies' %
len(thermo_params))
return thermo_params, cids_that_dont_decompose
def balance_reactions(self, rxn_inds_to_balance):
"""
use the chemical formulas from the InChIs to verify that each and every
reaction is balanced
"""
elements, Ematrix = self.ccache.get_kegg_ematrix(self.cids)
cpd_inds_without_formula = list(
np.nonzero(np.any(np.isnan(Ematrix), 1))[0].flat)
Ematrix[np.isnan(Ematrix)] = 0
S_without_formula = self.S[cpd_inds_without_formula, :]
rxn_inds_without_formula = np.nonzero(np.any(S_without_formula != 0,
0))[0]
rxn_inds_to_balance = set(rxn_inds_to_balance).difference(
rxn_inds_without_formula)
# need to check that all elements are balanced (except H, but including e-)
# if only O is not balanced, add water molecules
if 'O' in elements:
i_H2O = self.cids.index(1)
j_O = elements.index('O')
conserved = np.dot(Ematrix.T, self.S)
for k in rxn_inds_to_balance:
self.S[i_H2O, k] = self.S[i_H2O, k] - conserved[j_O, k]
# recalculate conservation matrix
conserved = Ematrix.T * self.S
rxn_inds_to_remove = [
k for k in rxn_inds_to_balance if np.any(conserved[:, k] != 0, 0)
]
for k in rxn_inds_to_remove:
sprs = {}
for i in np.nonzero(self.S[:, k])[0]:
sprs[self.cids[i]] = self.S[i, k]
reaction = KeggReaction(sprs)
logging.debug('unbalanced reaction #%d: %s' %
(k, reaction.write_formula()))
for j in np.where(conserved[:, k])[0].flat:
logging.debug(
'there are %d more %s atoms on the right-hand side' %
(conserved[j, k], elements[j]))
rxn_inds_to_keep = \
set(range(self.S.shape[1])).difference(rxn_inds_to_remove)
rxn_inds_to_keep = sorted(rxn_inds_to_keep)
self.S = self.S[:, rxn_inds_to_keep]
self.dG0_prime = self.dG0_prime[:, rxn_inds_to_keep]
self.T = self.T[:, rxn_inds_to_keep]
self.I = self.I[:, rxn_inds_to_keep]
self.pH = self.pH[:, rxn_inds_to_keep]
self.pMg = self.pMg[:, rxn_inds_to_keep]
self.weight = self.weight[:, rxn_inds_to_keep]
logging.info(
'After removing %d unbalanced reactions, the stoichiometric '
'matrix contains: '
'%d compounds and %d reactions' %
(len(rxn_inds_to_remove), self.S.shape[0], self.S.shape[1]))
