def test_gaf_2_1_simple_terms():
line = ["SGD", "S000000819", "AFG3", "", "GO:0006259", "PMID:8681382|SGD_REF:S000055187", "IMP", "", "P", "Mitochondrial inner membrane m-AAA protease component", "YER017C|AAA family ATPase AFG3|YTA10", "gene", "taxon:559292", "20170428", "SGD"]
ontology = OntologyFactory().create("tests/resources/goslim_generic.json")
p = GafParser(config=assocparser.AssocParserConfig(ontology=ontology))
p.make_internal_cell_component_closure()
parsed = gafparser.to_association(line)
assoc = p.upgrade_empty_qualifier(parsed.associations[0])
assert assoc.qualifiers[0] == association.Curie(namespace="RO", identity="0002264")
line = ["SGD", "S000000819", "AFG3", "", "GO:0042393", "PMID:8681382|SGD_REF:S000055187", "IMP", "", "P",
"Mitochondrial inner membrane m-AAA protease component", "YER017C|AAA family ATPase AFG3|YTA10", "gene",
"taxon:559292", "20170428", "SGD"]
ontology = OntologyFactory().create("tests/resources/goslim_generic.json")
p = GafParser(config=assocparser.AssocParserConfig(ontology=ontology))
p.make_internal_cell_component_closure()
parsed = gafparser.to_association(line)
assoc = p.upgrade_empty_qualifier(parsed.associations[0])
assert assoc.qualifiers[0] == association.Curie(namespace="RO", identity="0002327")
line = ["SGD", "S000000819", "AFG3", "", "GO:0005773", "PMID:8681382|SGD_REF:S000055187", "IMP", "", "P",
"Mitochondrial inner membrane m-AAA protease component", "YER017C|AAA family ATPase AFG3|YTA10", "gene",
"taxon:559292", "20170428", "SGD"]
ontology = OntologyFactory().create("tests/resources/goslim_generic.json")
p = GafParser(config=assocparser.AssocParserConfig(ontology=ontology))
p.make_internal_cell_component_closure()
parsed = gafparser.to_association(line)
assoc = p.upgrade_empty_qualifier(parsed.associations[0])
assert assoc.qualifiers[0] == association.Curie(namespace="RO", identity="0001025")
def load_associations_from_file(self, associations_type: DataType,
associations_url: str,
associations_cache_path: str,
config: GenedescConfigParser) -> None:
"""load go associations from file
Args:
associations_type (DataType): the type of associations to set
associations_url (str): url to the association file
associations_cache_path (str): path to cache file for the associations
config (GenedescConfigParser): configuration object where to read properties
"""
assoc_config = AssocParserConfig(remove_double_prefixes=True,
paint=True)
if associations_type == DataType.GO:
logger.info("Loading GO associations from file")
self.go_associations = AssociationSetFactory().create_from_assocs(
assocs=GafParser(config=assoc_config).parse(
file=self._get_cached_file(
cache_path=associations_cache_path,
file_source_url=associations_url),
skipheader=True),
ontology=self.go_ontology)
self.go_associations = self.remove_blacklisted_annotations(
association_set=self.go_associations,
ontology=self.go_ontology,
terms_blacklist=config.get_module_property(
module=Module.GO, prop=ConfigModuleProperty.EXCLUDE_TERMS))
elif associations_type == DataType.DO:
logger.info("Loading DO associations from file")
self.do_associations = AssociationSetFactory().create_from_assocs(
assocs=GafParser(config=assoc_config).parse(
file=self._get_cached_file(
cache_path=associations_cache_path,
file_source_url=associations_url),
skipheader=True),
ontology=self.do_ontology)
self.do_associations = self.remove_blacklisted_annotations(
association_set=self.do_associations,
ontology=self.do_ontology,
terms_blacklist=config.get_module_property(
module=Module.DO_EXP_AND_BIO,
prop=ConfigModuleProperty.EXCLUDE_TERMS))
elif associations_type == DataType.EXPR:
logger.info("Loading Expression associations from file")
self.expression_associations = AssociationSetFactory(
).create_from_assocs(assocs=GafParser(config=assoc_config).parse(
file=self._get_cached_file(cache_path=associations_cache_path,
file_source_url=associations_url),
skipheader=True),
ontology=self.expression_ontology)
self.expression_associations = self.remove_blacklisted_annotations(
association_set=self.expression_associations,
ontology=self.expression_ontology,
terms_blacklist=config.get_module_property(
module=Module.EXPRESSION,
prop=ConfigModuleProperty.EXCLUDE_TERMS))
def produce_gaf(dataset, source_gaf, ontology_graph, gpipath=None, paint=False, group="unknown"):
filtered_associations = open(os.path.join(os.path.split(source_gaf)[0], "{}_noiea.gaf".format(dataset)), "w")
config = assocparser.AssocParserConfig(
ontology=ontology_graph,
filter_out_evidence=["IEA"],
filtered_evidence_file=filtered_associations,
gpi_authority_path=gpipath,
paint=paint
)
validated_gaf_path = os.path.join(os.path.split(source_gaf)[0], "{}_valid.gaf".format(dataset))
outfile = open(validated_gaf_path, "w")
gafwriter = GafWriter(file=outfile)
click.echo("Validating source GAF: {}".format(source_gaf))
parser = GafParser(config=config, group=group, dataset=dataset)
with open(source_gaf) as sg:
lines = sum(1 for line in sg)
with open(source_gaf) as gaf:
with click.progressbar(iterable=parser.association_generator(file=gaf), length=lines) as associations:
for assoc in associations:
gafwriter.write_assoc(assoc)
outfile.close()
filtered_associations.close()
with open(os.path.join(os.path.split(source_gaf)[0], "{}.report.md".format(dataset)), "w") as report_md:
report_md.write(parser.report.to_markdown())
with open(os.path.join(os.path.split(source_gaf)[0], "{}.report.json".format(dataset)), "w") as report_json:
report_json.write(json.dumps(parser.report.to_report_json(), indent=4))
return [validated_gaf_path, filtered_associations.name]
def load_associations(self, taxon) -> None:
taxon_map = {
'human': 'NCBITaxon:9606',
'mouse': 'NCBITaxon:10090',
}
ofactory = OntologyFactory()
self.ontology = ofactory.create(self.ont)
p = GafParser()
url = ''
if self.ont == 'go':
# CX: GO:0008150 is biological_process, GO:0003674 is molecular_function.
# CX: These are 2 out of 3 top-level terms in GO ontology.
# CX: The excluded term is cellular_component (where gene carries out a molecular function)
go_roots = set(self.ontology.descendants('GO:0008150') + self.ontology.descendants('GO:0003674'))
sub_ont = self.ontology.subontology(go_roots)
if taxon == 'mouse':
url = "http://current.geneontology.org/annotations/mgi.gaf.gz"
if taxon == 'human':
url = "http://current.geneontology.org/annotations/goa_human.gaf.gz"
assocs = p.parse(url)
self.assocs = assocs
assocs = [x for x in assocs if 'header' not in x.keys()]
assocs = [x for x in assocs if x['object']['id'] in go_roots]
self.associations = self.afactory.create_from_assocs(assocs, ontology=sub_ont)
else:
self.associations = \
self.afactory.create(
ontology=self.ontology,
subject_category='gene',
object_category='phenotype',
taxon=taxon_map[taxon]
)
def test_errors_gaf():
p = GafParser()
p.config.ecomap = EcoMap()
assocs = p.parse(open("tests/resources/errors.gaf", "r"))
msgs = p.report.messages
print("MESSAGES: {}".format(len(msgs)))
for m in msgs:
print("MESSAGE: {}".format(m))
assert len(msgs) == 15
# we expect 4
assert len(assocs) == 7
from ontobio.io import GafWriter
w = GafWriter()
w.write(assocs)
for a in assocs:
if 'object_extensions' in a:
# our test file has no ORs, so in DNF this is always the first
xs = a['object_extensions']['union_of'][0]['intersection_of']
for x in xs:
print('X: {}'.format(x))
# ensure that invalid expressions have been eliminated
assert x['property'] == 'foo'
assert x['filler'] == 'X:1'
assert len(xs) == 1
def test_qualifiers_gaf():
# ont = OntologyFactory().create(ONT)
p = GafParser()
# p.config.ontology = ont
assocs = p.parse(open(QGAF, "r"), skipheader=True)
neg_assocs = [a for a in assocs if a['negated'] == True]
assert len(neg_assocs) == 3
for a in assocs:
print('REL: {}'.format(a['relation']))
assert len([a for a in assocs
if a['relation']['id'] == 'contributes_to']) == 1
# For the space in `colocalizes with`
assert len(
list(
filter(
lambda e: e["obj"] == "colocalizes with",
p.report.to_report_json()["messages"]["gorule-0000001"]))) == 1
assert len(
list(
filter(
lambda e: e["obj"] == "involved_in",
p.report.to_report_json()["messages"]["gorule-0000001"]))) == 1
def produce_ttl(dataset, target_dir, gaf_path, ontology_graph):
gafparser = GafParser()
gafparser.config = assocparser.AssocParserConfig(ontology=ontology_graph)
with open(gaf_path) as sg:
lines = sum(1 for line in sg)
ttl_path = os.path.join(
os.path.split(gaf_path)[0], "{}_cam.ttl".format(dataset))
click.echo("Producing ttl: {}".format(ttl_path))
rdf_writer = assoc_rdfgen.TurtleRdfWriter()
transformer = assoc_rdfgen.CamRdfTransform(writer=rdf_writer)
parser_config = assocparser.AssocParserConfig(ontology=ontology_graph)
with open(gaf_path) as gf:
with click.progressbar(
iterable=gafparser.association_generator(file=gf),
length=lines) as associations:
for association in associations:
if "header" not in association or not association["header"]:
transformer.provenance()
transformer.translate(association)
with open(ttl_path, "wb") as ttl:
click.echo("Writing ttl to disk")
rdf_writer.serialize(destination=ttl)
return ttl_path
def test_errors_gaf():
config = assocparser.AssocParserConfig(ecomap=EcoMap())
p = GafParser(config=config)
assocs = p.parse(open("tests/resources/errors.gaf", "r"), skipheader=True)
msgs = p.report.messages
print(json.dumps(p.report.to_report_json(), indent=4))
# print("MESSAGES: {}".format(len(msgs)))
n_invalid_idspace = 0
for m in msgs:
print("MESSAGE: {}".format(m))
if m['type'] == assocparser.Report.INVALID_IDSPACE:
n_invalid_idspace += 1
assert len(msgs) == 13
assert n_invalid_idspace == 1
assert len(assocs) == 2
w = GafWriter()
w.write(assocs)
for a in assocs:
if a.object_extensions != []:
# our test file has no ORs, so in DNF this is always the first
xs = a.object_extensions[0].elements
print(xs)
for x in xs:
print('X: {}'.format(x))
# ensure that invalid expressions have been eliminated
assert x.relation == association.Curie("BFO", "0000050")
assert x.term == association.Curie.from_str('X:1')
assert len(xs) == 1
def test_errors_gaf():
config = assocparser.AssocParserConfig(ecomap=EcoMap())
p = GafParser(config=config)
assocs = p.parse(open("tests/resources/errors.gaf", "r"), skipheader=True)
msgs = p.report.messages
print(json.dumps(p.report.to_report_json(), indent=4))
# print("MESSAGES: {}".format(len(msgs)))
n_invalid_idspace = 0
for m in msgs:
print("MESSAGE: {}".format(m))
if m['type'] == assocparser.Report.INVALID_IDSPACE:
n_invalid_idspace += 1
assert len(msgs) == 16
assert n_invalid_idspace == 1
assert len(assocs) == 5
w = GafWriter()
w.write(assocs)
for a in assocs:
if a['object_extensions'] != {}:
# our test file has no ORs, so in DNF this is always the first
xs = a['object_extensions']['union_of'][0]['intersection_of']
for x in xs:
print('X: {}'.format(x))
# ensure that invalid expressions have been eliminated
assert x['property'] == 'foo'
assert x['filler'] == 'X:1'
assert len(xs) == 1
def test_no_flag_valid_id():
ont = OntologyFactory().create(ONT)
p = GafParser()
p.config.ontology = ont
p._validate_ontology_class_id(
"GO:0000785", assocparser.SplitLine("fake", [""] * 17, taxon="foo"))
assert len(p.report.messages) == 0
def test_bad_date():
p = GafParser()
assoc_result = p.parse_line(
"PomBase\tSPAC25B8.17\typf1\t\tGO:0000007\tGO_REF:0000024\tISO\tSGD:S000001583\tC\tintramembrane aspartyl protease of the perinuclear ER membrane Ypf1 (predicted)\tppp81\tprotein\ttaxon:4896\tTODAY\tPomBase\tfoo(X:1)"
)
assert assoc_result.skipped == True
assert assoc_result.associations == []
def test_semsearch():
afa = AssociationSetFactory()
f = POMBASE
ont = OntologyFactory().create(ONT)
parser = GafParser()
assocs = parser.parse(POMBASE, skipheader=True)
assocs = [a for a in assocs if a['subject']['label'] in GENES]
aset = afa.create_from_assocs(assocs, ontology=ont)
ont = aset.subontology()
aset.ontology = ont
logging.info('Genes={} Terms={}'.format(len(aset.subjects),
len(ont.nodes())))
print('STATS={}'.format(aset.as_dataframe().describe()))
#genes = aset.subjects[0:5]
sse = SemSearchEngine(assocmodel=aset)
logging.info('Calculating all MICAs')
sse.calculate_all_micas()
#h5path = 'tests/resources/mica_ic.h5'
#logging.info('Saving to {}'.format(h5path))
#sse.mica_ic_df.to_hdf(h5path, key='mica_ic', mode='w')
#logging.info('Saved to {}'.format(h5path))
logging.info('Doing pairwise')
for i in aset.subjects:
for j in aset.subjects:
sim = sse.pw_score_cosine(i, j)
#print('{} x {} = {}'.format(i,j,sim))
if i == j:
assert (sim > 0.9999)
tups = sse.pw_score_resnik_bestmatches(i, j)
print('{} x {} = {} // {}'.format(i, j, sim, tups))
def retrieve_associations(self, ont, group):
taxon_map = {
'human': 'NCBITaxon:9606',
'mouse': 'NCBITaxon:10090',
}
ofactory = OntologyFactory()
self.ontology = ofactory.create(ont)
p = GafParser()
url = ''
if ont == 'go':
go_roots = set(
self.ontology.descendants('GO:0008150') +
self.ontology.descendants('GO:0003674'))
sub_ont = self.ontology.subontology(go_roots)
if group == 'mouse':
url = "http://current.geneontology.org/annotations/mgi.gaf.gz"
if group == 'human':
url = "http://current.geneontology.org/annotations/goa_human.gaf.gz"
assocs = p.parse('goa_human.gaf.gz')
#assocs = p.parse(url)
self.assocs = assocs
assocs = [x for x in assocs if 'header' not in x.keys()]
assocs = [x for x in assocs if x['object']['id'] in go_roots]
self.associations = self.afactory.create_from_assocs(
assocs, ontology=sub_ont)
else:
self.associations = self.afactory.create(
ontology=self.ontology,
subject_category='gene',
object_category='phenotype',
taxon=taxon_map[group])
def create_from_file(self, file=None, fmt='gaf', skim=True, **args):
"""
Creates from a file.
Arguments
---------
file : str or file
input file or filename
format : str
name of format e.g. gaf
"""
p = None
if fmt == 'gaf':
p = GafParser()
elif fmt == 'gpad':
p = GpadParser()
elif fmt == 'hpoa':
p = HpoaParser()
else:
logging.error("Format not recognized: {}".format(fmt))
logging.info("Parsing {} with {}/{}".format(file, fmt, p))
if skim:
results = p.skim(file)
return self.create_from_tuples(results, **args)
else:
assocs = p.parse(file, skipheader=True)
return self.create_from_assocs(assocs, **args)
def produce_gpi(dataset, target_dir, gaf_path, ontology_graph):
gafparser = GafParser()
gafparser.config = assocparser.AssocParserConfig(ontology=ontology_graph)
with open(gaf_path) as sg:
lines = sum(1 for line in sg)
gpi_path = os.path.join(
os.path.split(gaf_path)[0], "{}.gpi".format(dataset))
with open(gaf_path) as gf, open(gpi_path, "w") as gpi:
click.echo("Using {} as the gaf to build gpi with".format(gaf_path))
bridge = gafgpibridge.GafGpiBridge()
gpiwriter = entitywriter.GpiWriter(file=gpi)
gpi_cache = set()
with click.progressbar(
iterable=gafparser.association_generator(file=gf),
length=lines) as associations:
for association in associations:
entity = bridge.convert_association(association)
if entity not in gpi_cache and entity is not None:
# If the entity is not in the cache, add it and write it out
gpi_cache.add(entity)
gpiwriter.write_entity(entity)
return gpi_path
def test_default_gaf_version():
p = GafParser()
assocs = p.parse(open("tests/resources/test-qualifiers-no-version.gaf"),
skipheader=True)
assert p.version == "2.1"
def test_subject_extensions():
p = GafParser()
assoc_result = p.parse_line("PomBase\tSPAC25B8.17\typf1\t\tGO:0000007\tGO_REF:0000024\tISO\tSGD:S000001583\tC\tintramembrane aspartyl protease of the perinuclear ER membrane Ypf1 (predicted)\tppp81\tprotein\ttaxon:4896\t20181024\tPomBase\tfoo(X:1)\tUniProtKB:P12345")
print(json.dumps(assoc_result.associations[0], indent=4))
assert "subject_extensions" in assoc_result.associations[0]
subject_extensions = assoc_result.associations[0]['subject_extensions']
gene_product_form_id = [extension["filler"] for extension in subject_extensions if extension["property"] == "isoform"][0]
assert gene_product_form_id == "UniProtKB:P12345"
def test_subject_extensions():
p = GafParser()
assoc_result = p.parse_line("PomBase\tSPAC25B8.17\typf1\t\tGO:0000007\tGO_REF:0000024\tISO\tSGD:S000001583\tC\tintramembrane aspartyl protease of the perinuclear ER membrane Ypf1 (predicted)\tppp81\tprotein\ttaxon:4896\t20181024\tPomBase\tpart_of(X:1)\tUniProtKB:P12345")
assert len(assoc_result.associations[0].subject_extensions) == 1
subject_extensions = assoc_result.associations[0].subject_extensions
gene_product_form_id = subject_extensions[0].term
assert gene_product_form_id == association.Curie.from_str("UniProtKB:P12345")
def test_validate_go_idspaces():
ont = OntologyFactory().create(ONT)
p = GafParser()
p.config.class_idspaces = ['FOOZ']
assocs = p.parse(open(POMBASE, "r"), skipheader=True)
for m in p.report.messages:
print("MESSAGE: {}".format(m))
assert len(assocs) == 0
assert len(p.report.messages) > 1
summary = p.report.to_report_json()
assert summary['associations'] == 0
assert summary['lines'] > 300
print(p.report.to_markdown())
# ensure config is not preserved
p = GafParser()
assert p.config.class_idspaces == None
def test_obsolete_replair_of_withfrom():
p = GafParser(config=assocparser.AssocParserConfig(
ontology=OntologyFactory().create(OBSOLETE_ONT)))
assocs = p.parse(open(ZFIN_GAF, "r"), skipheader=True)
assert assocs[0].evidence.with_support_from == [
ConjunctiveSet(elements=[Curie(namespace='GO', identity='0005912')])
]
# Reset parser report
p = GafParser(config=assocparser.AssocParserConfig(
ontology=OntologyFactory().create(OBSOLETE_ONT)))
p.version = "2.2"
obsolete_no_replacement_line = "FB\tFBgn0003334\tScm\tlocated_in\tGO:0005634\tFB:FBrf0179383|PMID:15280237\tIC\tGO:0016458\tC\tSex comb on midleg\tCG9495|SCM|Sex Comb on Midleg|Sex Comb on the Midleg|Sex combs on midleg|Sex combs on midlegs|Su(z)302|l(3)85Ef|scm|sex comb on midleg\tprotein\ttaxon:7227\t20050203\tUniProt\t\t"
assoc_result = p.parse_line(obsolete_no_replacement_line)
assert assoc_result.associations == []
assert p.report.to_report_json(
)["messages"]["gorule-0000020"][0]["obj"] == "GO:0016458"
def test_gaf_2_1_upconvert_in_parse():
gaf = io.StringIO("!gaf-version: 2.1\nSGD\tS000000819\tAFG3\t\tGO:0005840\tPMID:8681382|SGD_REF:S000055187\tIMP\t\tP\tMitochondrial inner membrane m-AAA protease component\tYER017C|AAA family ATPase AFG3|YTA10\tgene\ttaxon:559292\t20170428\tSGD")
ontology = OntologyFactory().create("tests/resources/goslim_generic.json")
p = GafParser(config=assocparser.AssocParserConfig(ontology=ontology))
# We're 2.1, qualifier blank, cell component term from above, ontology defined: should upgrade
assocs = p.parse(gaf, skipheader=True)
assert assocs[0].relation == association.Curie(namespace="BFO", identity="0000050")
def test_one_line():
p = GafParser(config=assocparser.AssocParserConfig(
ontology=OntologyFactory().create(
"tests/resources/goslim_generic.json")))
parsed = p.parse_line(
"PomBase SPBC16D10.09 pcn1 GO:0009536 PMID:8663159 IDA C PCNA pcn protein taxon:4896 20150326 PomBase"
)
def test_bad_withfrom():
p = GafParser()
# With/from has no identity portion after the namespace
assoc_result = p.parse_line(
"PomBase\tSPAC25B8.17\typf1\t\tGO:0000007\tGO_REF:0000024\tISO\tSGD:\tC\tintramembrane aspartyl protease of the perinuclear ER membrane Ypf1 (predicted)\tppp81\tprotein\ttaxon:4896\t20181024\tPomBase"
)
assert assoc_result.associations == []
assert p.report.to_report_json(
)["messages"]["gorule-0000001"][0]["obj"] == "SGD:"
def test_errors_gaf():
p = GafParser()
p.config.ecomap = EcoMap()
assocs = p.parse(open("tests/resources/errors.gaf", "r"))
msgs = p.report.messages
print("MESSAGES: {}".format(len(msgs)))
for m in msgs:
print("MESSAGE: {}".format(m))
assert len(msgs) == 8
def test_alt_id_repair():
p = GafParser()
ont = OntologyFactory().create(ALT_ID_ONT)
p.config.ecomap = EcoMap()
p.config.ontology = ont
gaf = io.StringIO("SGD\tS000000819\tAFG3\t\tGO:0043623\tPMID:8681382|SGD_REF:S000055187\tIMP\t\tP\tMitochondrial inner membrane m-AAA protease component\tYER017C|AAA family ATPase AFG3|YTA10\tgene\ttaxon:559292\t20170428\tSGD")
assocs = p.parse(gaf, skipheader=True)
assert len(assocs) > 0
assert assocs[0]["object"]["id"] == "GO:0043623"
def create_from_remote_file(self, group, snapshot=True, **args):
"""
Creates from remote GAF
"""
import requests
url = "http://snapshot.geneontology.org/annotations/{}.gaf.gz".format(group)
r = requests.get(url, stream=True, headers={'User-Agent': get_user_agent(modules=[requests], caller_name=__name__)})
p = GafParser()
results = p.skim(r.raw)
return self.create_from_tuples(results, **args)
def create_from_remote_file(self, group, snapshot=True, **args):
"""
Creates from remote GAF
"""
import requests
url = "http://snapshot.geneontology.org/annotations/{}.gaf.gz".format(group)
r = requests.get(url, stream=True)
p = GafParser()
results = p.skim(r.raw)
return self.create_from_tuples(results, **args)
def test_skim_gaf():
p = GafParser()
p.config.ecomap = EcoMap()
results = p.skim(open(POMBASE, "r"))
assert len(results) == 370
for r in results:
print(str(r))
(s, sn, o) = r
assert o.startswith('GO:')
assert s.startswith('PomBase:')
def test_object_extensions():
p = GafParser()
assoc_result = p.parse_line("PomBase\tSPAC25B8.17\typf1\t\tGO:0000007\tGO_REF:0000024\tISO\tSGD:S000001583\tC\tintramembrane aspartyl protease of the perinuclear ER membrane Ypf1 (predicted)\tppp81\tprotein\ttaxon:4896\t20181024\tPomBase\tpart_of(X:1)\tUniProtKB:P12345")
print(p.report.to_markdown())
assert len(assoc_result.associations[0].object_extensions) > 0
object_extensions = [
association.ConjunctiveSet([
association.ExtensionUnit(association.Curie("BFO", "0000050"), association.Curie("X", "1"))
])
]
assert assoc_result.associations[0].object_extensions == object_extensions
def load_associations(self, group):
p = GafParser()
afactory = AssociationSetFactory()
url = "http://geneontology.org/gene-associations/gene_association.{}.gz".format(
group)
if group == 'human':
url = "http://geneontology.org/gene-associations/goa_human.gaf.gz"
assocs = p.parse(url)
assocs = [x for x in assocs if 'header' not in x.keys()]
self.associations = afactory.create_from_assocs(assocs,
ontology=self.ontology)
