def test_wrap(self, fasta_filename):
chr_names = ['chrM', 'chr1', 'chr2']
chr_lengths = [100, 76, 121]
fasta = test_utils.genomics_core_testdata(fasta_filename)
fai = test_utils.genomics_core_testdata(fasta_filename + '.fai')
with reference_fai.GenomeReferenceFai.from_file(fasta, fai) as ref:
self.assertEqual(ref.n_contigs, 3)
self.assertIn(fasta, ref.fasta_path)
self.assertIn('GenomeReference backed by htslib FAI index',
str(ref))
self.assertEqual(ref.contig_names, chr_names)
self.assertEqual(ref.n_bp, sum(chr_lengths))
self.assertEqual(ref.bases(ranges.make_range('chrM', 1, 10)),
'ATCACAGGT')
self.assertTrue(
ref.is_valid_interval(ranges.make_range('chrM', 1, 10)))
self.assertFalse(
ref.is_valid_interval(ranges.make_range('chrM', 1, 100000)))
self.assertEqual(len(ref.contigs), 3)
self.assertEqual([c.name for c in ref.contigs], chr_names)
self.assertEqual([c.n_bases for c in ref.contigs], chr_lengths)
for contig in ref.contigs:
self.assertEqual(ref.contig(contig.name), contig)
self.assertTrue(ref.has_contig(contig.name))
self.assertFalse(ref.has_contig(contig.name + '.unknown'))
def test_detector_ranges(self):
test_ranges = [
ranges.make_range('chr1', 0, 5),
ranges.make_range('chr1', 8, 10),
ranges.make_range('chr1', 12, 13),
ranges.make_range('chr2', 2, 5),
]
range_set = ranges.RangeSet(test_ranges)
self.assertEqual(bool(range_set), True)
self.assertEqual(len(range_set), 4)
self.assertEqual(range_set.overlaps('chr1', 0), True)
self.assertEqual(range_set.overlaps('chr1', 1), True)
self.assertEqual(range_set.overlaps('chr1', 2), True)
self.assertEqual(range_set.overlaps('chr1', 3), True)
self.assertEqual(range_set.overlaps('chr1', 4), True)
self.assertEqual(range_set.overlaps('chr1', 5), False)
self.assertEqual(range_set.overlaps('chr1', 6), False)
self.assertEqual(range_set.overlaps('chr1', 7), False)
self.assertEqual(range_set.overlaps('chr1', 8), True)
self.assertEqual(range_set.overlaps('chr1', 9), True)
self.assertEqual(range_set.overlaps('chr1', 10), False)
self.assertEqual(range_set.overlaps('chr1', 11), False)
self.assertEqual(range_set.overlaps('chr1', 12), True)
self.assertEqual(range_set.overlaps('chr1', 13), False)
self.assertEqual(range_set.overlaps('chr1', 100), False)
self.assertEqual(range_set.overlaps('chr1', 1000), False)
self.assertEqual(range_set.overlaps('chr2', 0), False)
self.assertEqual(range_set.overlaps('chr2', 1), False)
self.assertEqual(range_set.overlaps('chr2', 2), True)
self.assertEqual(range_set.overlaps('chr2', 3), True)
self.assertEqual(range_set.overlaps('chr2', 4), True)
self.assertEqual(range_set.overlaps('chr2', 5), False)
self.assertEqual(range_set.overlaps('chr2', 6), False)
self.assertEqual(range_set.overlaps('chr3', 3), False)
def test_envelops(self):
start_ix = 5
end_ix = 10
start_ix2 = end_ix + 1
end_ix2 = end_ix + 5
range_set = ranges.RangeSet([
ranges.make_range('chr1', start_ix, end_ix),
ranges.make_range('chr1', start_ix2, end_ix2)
])
# No start position before the first start range is enveloped.
for i in range(start_ix):
self.assertFalse(range_set.envelops('chr1', i, start_ix + 1))
# All regions within a single record are enveloped.
for six in range(start_ix, end_ix):
for eix in range(six, end_ix + 1):
self.assertTrue(range_set.envelops('chr1', six, eix),
'chr1 {} {} not enveloped'.format(six, eix))
# Bridging across two ranges is not enveloped.
for six in range(start_ix, end_ix):
for eix in range(start_ix2, end_ix2 + 1):
self.assertFalse(range_set.envelops('chr1', six, eix))
# Other chromosome is not spanned.
self.assertFalse(range_set.envelops('chr2', start_ix, start_ix + 1))
def test_read_range(self, update_cached_read_end_first):
"""Tests reads have their ranges calculated correctly."""
start = 10000001
read = test_utils.make_read(
'AAACAG',
chrom='chrX',
start=start,
cigar='2M1I3M',
quals=range(10, 16),
name='read1')
if update_cached_read_end_first:
# Explicitly update cached_end.
read.cached_end = utils.read_end(read, use_cached_read_end=False)
self.assertEqual(
ranges.make_range('chrX', start, start + 5), utils.read_range(read))
read = test_utils.make_read(
'AAACAG',
chrom='chrX',
start=start,
cigar='2M16D3M',
quals=range(10, 16),
name='read1')
if update_cached_read_end_first:
# Explicitly update cached_end.
read.cached_end = utils.read_end(read, use_cached_read_end=False)
self.assertEqual(
ranges.make_range('chrX', start, start + 5 + 16),
utils.read_range(read))
def test_from_regions_not_empty(self):
literals = ['chr1', 'chr2:10-20']
self.assertItemsEqual(
[ranges.make_range('chr1', 0, 10),
ranges.make_range('chr2', 9, 20)],
ranges.RangeSet.from_regions(
literals, ranges.contigs_dict(_TEST_CONTIGS)))
def test_parse_literal_one_bp(self):
self.assertEqual(ranges.parse_literal('1:10'),
ranges.make_range('1', 9, 10))
self.assertEqual(ranges.parse_literal('1:100'),
ranges.make_range('1', 99, 100))
self.assertEqual(ranges.parse_literal('1:1,000'),
ranges.make_range('1', 999, 1000))
def test_from_bed(self, bed_filename):
source = test_utils.genomics_core_testdata(bed_filename)
self.assertCountEqual([
ranges.make_range('chr1', 1, 10),
ranges.make_range('chr2', 20, 30),
ranges.make_range('chr2', 40, 60),
ranges.make_range('chr3', 80, 90),
], ranges.RangeSet.from_bed(source))
def test_partitions(self, interval_size, expected):
rangeset = ranges.RangeSet([
ranges.make_range('chrM', 0, 100),
ranges.make_range('chr1', 0, 76),
ranges.make_range('chr2', 0, 121),
])
self.assertEqual([ranges.make_range(*args) for args in expected],
list(rangeset.partition(interval_size)))
def test_partition_of_multiple_intervals(self, interval_size, expected):
rangeset = ranges.RangeSet([
ranges.make_range('1', 0, 10),
ranges.make_range('1', 20, 40),
ranges.make_range('1', 45, 50),
])
self.assertCountEqual([ranges.make_range(*args) for args in expected],
rangeset.partition(interval_size))
def test_query_edge_cases(self):
reader = fasta.InMemoryFastaReader([('1', 0, 'ACGT')])
# Check that we can query the first base correctly.
self.assertEqual(reader.query(ranges.make_range('1', 0, 1)), 'A')
# Check that we can query the last base correctly.
self.assertEqual(reader.query(ranges.make_range('1', 3, 4)), 'T')
# Check that we can query the entire sequence correctly.
self.assertEqual(reader.query(ranges.make_range('1', 0, 4)), 'ACGT')
def test_from_contigs(self):
contigs = [
reference_pb2.ContigInfo(name='chr1', n_bases=10),
reference_pb2.ContigInfo(name='chr2', n_bases=5),
]
self.assertCountEqual([
ranges.make_range('chr1', 0, 10),
ranges.make_range('chr2', 0, 5),
], ranges.RangeSet.from_contigs(contigs))
def test_find_max_overlapping_returns_least_index(self):
query_range = ranges.make_range('1', 0, 10)
search_ranges = [
ranges.make_range('1', 0, 5),
ranges.make_range('1', 5, 10)
]
for to_search in [search_ranges, list(reversed(search_ranges))]:
self.assertEqual(0, ranges.find_max_overlapping(query_range, to_search))
def test_partitions_bad_interval_size_raises(self):
# list() is necessary to force the generator to execute.
with self.assertRaisesRegexp(ValueError, 'max_size'):
list(
ranges.RangeSet([ranges.make_range('chrM', 0,
100)]).partition(-10))
with self.assertRaisesRegexp(ValueError, 'max_size'):
list(
ranges.RangeSet([ranges.make_range('chrM', 0,
100)]).partition(0))
def test_from_regions_not_empty(self):
literals = ['chr1', 'chr2:10-20']
contig_map = {
'chr1': reference_pb2.ContigInfo(name='chr1', n_bases=10),
'chr2': reference_pb2.ContigInfo(name='chr2', n_bases=100),
}
self.assertItemsEqual(
[ranges.make_range('chr1', 0, 10),
ranges.make_range('chr2', 9, 20)],
ranges.RangeSet.from_regions(literals, contig_map))
def test_bed_parser(self):
test_bed_path = test_utils.test_tmpfile(
'test_bed_parser.bed', '\n'.join([
'chr20\t61724611\t61725646', 'chr20\t61304163\t61305182',
'chr20\t61286467\t61286789'
]))
self.assertEqual(list(ranges.bed_parser(test_bed_path)), [
ranges.make_range('chr20', 61724611, 61725646),
ranges.make_range('chr20', 61304163, 61305182),
ranges.make_range('chr20', 61286467, 61286789),
])
def test_bedpe_parser_skips_cross_chr_events(self):
# pylint: disable=line-too-long
data = [
'chr20\t25763416\t25765517\tchr21\t25825181\t25826882\tP2_PM_20_1549\t63266\t+\tTYPE:DELETION',
'chr20\t25972820\t25972991\tchr20\t26045347\t26045538\tP2_PM_20_696\t72548\t+\tTYPE:DELETION',
'chr20\t23719873\t23721974\tchr20\t23794822\t23796523\tP2_PM_20_1548\t76450\t+\tTYPE:DELETION',
]
self.assertEqual(list(ranges.parse_lines(data, 'bedpe')), [
ranges.make_range('chr20', 25972820, 26045538),
ranges.make_range('chr20', 23719873, 23796523),
])
def test_bed_parser(self):
data = [
'chr20\t61724611\t61725646',
'chr20\t61304163\t61305182',
'chr20\t61286467\t61286789',
]
self.assertEqual(list(ranges.parse_lines(data, 'bed')), [
ranges.make_range('chr20', 61724611, 61725646),
ranges.make_range('chr20', 61304163, 61305182),
ranges.make_range('chr20', 61286467, 61286789),
])
def test_dispatching_reader(self):
with fasta.FastaReader(
test_utils.genomics_core_testdata('test.fasta')) as reader:
# The reader is an instance of IndexedFastaReader which supports query().
self.assertEqual(reader.query(ranges.make_range('chrM', 1, 6)), 'ATCAC')
with fasta.FastaReader(
test_utils.genomics_core_testdata('unindexed.fasta')) as reader:
# The reader is an instance of UnindexedFastaReader which doesn't support
# query().
with self.assertRaises(NotImplementedError):
reader.query(ranges.make_range('chrM', 1, 5))
def setUp(self):
out_fname = test_utils.test_tmpfile('output.gff')
self.writer = gff_writer.GffWriter.to_file(out_fname,
gff_pb2.GffHeader(),
gff_pb2.GffWriterOptions())
self.expected_gff_content = open(
test_utils.genomics_core_testdata(
'test_features.gff')).readlines()
self.header = gff_pb2.GffHeader(
sequence_regions=[ranges.make_range('ctg123', 0, 1497228)])
self.record = gff_pb2.GffRecord(
range=ranges.make_range('ctg123', 1000, 1100))
def test_expand_raises_with_missing_contig_in_map(self):
# Empty contig_map should raise.
with self.assertRaises(KeyError):
ranges.expand(ranges.make_range('1', 10, 20), 1, contig_map={})
# Missing '1' from the contig map should raise.
with self.assertRaises(KeyError):
ranges.expand(ranges.make_range('1', 10, 20),
1,
contig_map={
'2': reference_pb2.ContigInfo(name='2',
n_bases=50),
})
def test_bedpe_parser_skips_cross_chr_events(self):
# pylint: disable=line-too-long
data = '\n'.join([
'chr20\t25763416\t25765517\tchr21\t25825181\t25826882\tP2_PM_20_1549\t63266\t+\tTYPE:DELETION',
'chr20\t25972820\t25972991\tchr20\t26045347\t26045538\tP2_PM_20_696\t72548\t+\tTYPE:DELETION',
'chr20\t23719873\t23721974\tchr20\t23794822\t23796523\tP2_PM_20_1548\t76450\t+\tTYPE:DELETION',
])
test_bedpe_path = test_utils.test_tmpfile('test_bedpe_parser2.bedpe',
data)
self.assertEqual(list(ranges.bedpe_parser(test_bedpe_path)), [
ranges.make_range('chr20', 25972820, 26045538),
ranges.make_range('chr20', 23719873, 23796523),
])
def test_find_max_overlapping_allows_unordered_search_ranges(self):
query_range = ranges.make_range('1', 4, 12)
search_ranges = [
ranges.make_range('1', 0, 10),
ranges.make_range('1', 10, 20),
ranges.make_range('1', 12, 20)
]
max_overlapping_range = search_ranges[0]
for permutated_ranges in itertools.permutations(search_ranges):
self.assertEqual(
permutated_ranges.index(max_overlapping_range),
ranges.find_max_overlapping(query_range, permutated_ranges))
def test_variant_position_and_range(self):
v1 = test_utils.make_variant(chrom='1', alleles=['A', 'C'], start=10)
v2 = test_utils.make_variant(chrom='1', alleles=['AGCT', 'C'], start=10)
pos = ranges.make_range('1', 10, 11)
range_ = ranges.make_range('1', 10, 14)
v1_range_tuple = ('1', 10, 11)
v2_range_tuple = ('1', 10, 14)
self.assertEqual(pos, variant_utils.variant_position(v1))
self.assertEqual(pos, variant_utils.variant_position(v2))
self.assertEqual(pos, variant_utils.variant_range(v1))
self.assertEqual(range_, variant_utils.variant_range(v2))
self.assertEqual(v1_range_tuple, variant_utils.variant_range_tuple(v1))
self.assertEqual(v2_range_tuple, variant_utils.variant_range_tuple(v2))
def test_good_query(self):
for contig in self.fasta_reader.header.contigs:
for start in range(contig.n_bases):
for end in range(start, contig.n_bases):
region = ranges.make_range(contig.name, start, end)
self.assertEqual(self.in_mem.query(region),
self.fasta_reader.query(region))
def __init__(self, chromosomes):
"""Initializes an InMemoryFastaReader using data from chromosomes.
Args:
chromosomes: list[tuple]. The chromosomes we are caching in memory as a
list of tuples. Each tuple must be exactly three elements in length,
containing (chromosome name [str], start [int], bases [str]).
Raises:
ValueError: If any of the chromosomes tuples are invalid.
"""
super(InMemoryFastaReader, self).__init__()
ref_seqs = []
contigs = []
for i, (contig_name, start, bases) in enumerate(chromosomes):
if start < 0:
raise ValueError('start={} must be >= for chromosome={}'.format(
start, contig_name))
if not bases:
raise ValueError(
'Bases must contain at least one base, but got "{}"'.format(bases))
end = start + len(bases)
ref_seqs.append(reference_pb2.ReferenceSequence(
region=ranges.make_range(contig_name, start, end), bases=bases))
contigs.append(
reference_pb2.ContigInfo(
name=contig_name, n_bases=end, pos_in_fasta=i))
self._reader = in_memory_fasta_reader.InMemoryFastaReader.create(
contigs, ref_seqs)
self.header = RefFastaHeader(contigs=self._reader.contigs)
def test_overlaps_variant_with_ranges(self):
variant = variants_pb2.Variant(reference_name='chr2', start=10, end=11)
range_set = ranges.RangeSet([ranges.make_range('chr1', 0, 5)])
with mock.patch.object(range_set, 'overlaps') as mock_overlaps:
mock_overlaps.return_value = True
self.assertEqual(range_set.variant_overlaps(variant), True)
mock_overlaps.assert_called_once_with('chr2', 10)
def setUp(self):
tfrecord_file = test_utils.genomics_core_testdata(
'test_features.gff.tfrecord')
self.records = list(
io_utils.read_tfrecords(tfrecord_file, proto=gff_pb2.GffRecord))
self.header = gff_pb2.GffHeader(
sequence_regions=[ranges.make_range('ctg123', 0, 1497228)])
def make_ngs_error_examples(ref_path, vcf_path, bam_path):
""" Yields tf.Example for training a ML model.
Each tf.Example contains
relevant features aboout the ngs read.
Args:
ref_path: str. A path to an indexed fasta file.
vcf_path: str. A path to an indexed VCF file.
bam_path: str. A path to an SAM/BAM file.
Yields:
A tuple (example, ngs_read_length, has_error), where example is a
tf.Example, ngs_read_length is the length of the read generated by the
sequencer, and has_error is a boolean specifying whether the example
contains a read error.
"""
# Create a ref_reader backed by ref.
ref_reader = fasta.IndexedFastaReader(ref_path)
# Create a vcf_reader backed by vcf.
vcf_reader = vcf.VcfReader(vcf_path)
# Create a sam_reader backed by bam. Provide an empty ReadRequirements
# proto to the reader so it enables standard filtering based on the default
# values of ReadRequirements. Also explicitly allow the reader to access an
# unindexed BAM, so only the iterate() function is enabled.
read_requirements = reads_pb2.ReadRequirements()
sam_reader = sam.SamReader(bam_path, read_requirements=read_requirements)
# All our readers and writers are context managers, so use the `with`
# construct to open all of the inputs/outputs and close them when we are done
# looping over our reads.
with ref_reader, vcf_reader, sam_reader:
# Loop over the reads in our BAM file:
for read in sam_reader.iterate():
# Get the Range proto describing the chrom/start/stop spanned by our read.
assert len(read.alignment.cigar) > 0
first_cigar = read.alignment.cigar[0]
# If the first cigar is a CLIP_SOFT, the start of sequence is the cigar
# operation length before the alignment position.
start = read.alignment.position.position
if first_cigar.operation == cigar_pb2.CigarUnit.CLIP_SOFT:
start -= first_cigar.operation_length
read_range = ranges.make_range(read.alignment.position.reference_name,
start, start + len(read.aligned_sequence))
# Get all of the variants that overlap our read range.
variants = list(vcf_reader.query(read_range))
# Get the reference bases spanned by our read.
ref_bases = ref_reader.query(read_range)
# Check that we can use our read for generating an example.
if is_usable_training_example(read, variants, ref_bases):
# Convert read and ref_bases to a tf.Example with make_example.
yield make_example(read, ref_bases), len(read.aligned_sequence), (
read.aligned_sequence != ref_bases)
def check_overlaps(chr1, start1, end1, chr2, start2, end2, expected):
nbp = end1 - start1
read = test_utils.make_read(
'A' * nbp, chrom=chr1, start=start1, cigar='{}M'.format(nbp))
region = ranges.make_range(chr2, start2, end2)
self.assertEqual(utils.read_overlaps_region(read, region), expected)
# This check ensures we get the same result calling ranges.ranges_overlap.
self.assertEqual(
ranges.ranges_overlap(region, utils.read_range(read)), expected)
def setUpClass(cls):
cls.fasta_reader = fasta.RefFastaReader(
test_utils.genomics_core_testdata('test.fasta'))
cls.in_mem = fasta.InMemoryRefReader(
[(contig.name, 0,
cls.fasta_reader.query(
ranges.make_range(contig.name, 0, contig.n_bases)))
for contig in cls.fasta_reader.header.contigs])
