def __getitem__(self, idx):
if self.fasta_extractor is None:
self.fasta_extractor = FastaExtractor(self.fasta_file)
interval, labels = self.tsv[idx]
if self.auto_resize_len:
# automatically resize the sequence to cerat
interval = resize_interval(interval, self.auto_resize_len)
# Run the fasta extractor
seq = np.squeeze(self.fasta_extractor([interval]))
return {
"inputs": {"seq": seq},
"targets": labels,
"metadata": {
"ranges": GenomicRanges(chr=interval.chrom,
start=interval.start,
end=interval.stop,
id=str(idx),
strand=(interval.strand
if interval.strand is not None
else "*"),
),
"interval_from_task": ''
}
}
def get_nonredundant_example_idx(ranges, width=200):
"""Get non - overlapping intervals(in the central region)
Args:
ranges: pandas.DataFrame returned by bpnet.cli.modisco.load_ranges
width: central region considered that should not overlap between
any interval
"""
from pybedtools import BedTool
from bpnet.preproc import resize_interval
# 1. resize ranges
ranges['example_idx'] = np.arange(len(ranges)) # make sure
r = ranges[['chrom', 'start', 'end',
'example_idx']] # add also the strand information
if width is not None:
r = resize_interval(r, width, ignore_strand=True)
bt = BedTool.from_dataframe(r)
btm = bt.sort().merge()
df = btm.to_dataframe()
df = df[(df.end - df.start) < width * 2]
r_overlaps = bt.intersect(BedTool.from_dataframe(df),
wb=True).to_dataframe()
keep_idx = r_overlaps.drop_duplicates(['score', 'strand',
'thickStart'])['name'].astype(int)
return keep_idx
def dataspec_stats(dataspec, regions=None, sample=None, peak_width=1000):
"""Compute the stats about the tracks
"""
import random
from pybedtools import BedTool
from bpnet.preproc import resize_interval
from genomelake.extractors import FastaExtractor
ds = DataSpec.load(dataspec)
if regions is not None:
regions = list(BedTool(regions))
else:
regions = ds.get_all_regions()
if sample is not None and sample < len(regions):
logger.info(
f"Using {sample} randomly sampled regions instead of {len(regions)}"
)
regions = random.sample(regions, k=sample)
# resize the regions
regions = [
resize_interval(interval, peak_width, ignore_strand=True)
for interval in regions
]
base_freq = FastaExtractor(ds.fasta_file)(regions).mean(axis=(0, 1))
count_stats = _track_stats(ds.load_counts(regions, progbar=True))
bias_count_stats = _track_stats(ds.load_bias_counts(regions, progbar=True))
print("")
print("Base frequency")
for i, base in enumerate(['A', 'C', 'G', 'T']):
print(f"- {base}: {base_freq[i]}")
print("")
print("Count stats")
for task, stats in count_stats.items():
print(f"- {task}")
for stat_key, stat_value in stats.items():
print(f" {stat_key}: {stat_value}")
print("")
print("Bias stats")
for task, stats in bias_count_stats.items():
print(f"- {task}")
for stat_key, stat_value in stats.items():
print(f" {stat_key}: {stat_value}")
lamb = np.mean([v["total median"] for v in count_stats.values()]) / 10
print("")
print(
f"We recommend to set lambda=total_count_median / 10 = {lamb:.2f} (default=10) in `bpnet train --override=` "
"to put 5x more weight on profile prediction than on total count prediction."
)
def bpnet_export_bw(
model_dir,
output_prefix,
fasta_file=None,
regions=None,
contrib_method='grad',
contrib_wildcard='*/profile/wn,*/counts/pre-act', # specifies which contrib. scores to compute
batch_size=256,
scale_contribution=False,
flip_negative_strand=False,
gpu=0,
memfrac_gpu=0.45):
"""Export model predictions and contribution scores to big-wig files
"""
from pybedtools import BedTool
from bpnet.modisco.core import Seqlet
output_dir = os.path.dirname(output_prefix)
add_file_logging(output_dir, logger, 'bpnet-export-bw')
os.makedirs(output_dir, exist_ok=True)
if gpu is not None:
create_tf_session(gpu, per_process_gpu_memory_fraction=memfrac_gpu)
logger.info("Load model")
bp = BPNetSeqModel.from_mdir(model_dir)
if regions is not None:
logger.info(
f"Computing predictions and contribution scores for provided regions: {regions}"
)
regions = list(BedTool(regions))
else:
logger.info("--regions not provided. Using regions from dataspec.yml")
ds = DataSpec.load(os.path.join(model_dir, 'dataspec.yml'))
regions = ds.get_all_regions()
seqlen = bp.input_seqlen()
logger.info(
f"Resizing regions (fix=center) to model's input width of: {seqlen}")
regions = [resize_interval(interval, seqlen) for interval in regions]
logger.info("Sort the bed file")
regions = list(BedTool(regions).sort())
bp.export_bw(regions=regions,
output_prefix=output_prefix,
contrib_method=contrib_method,
fasta_file=fasta_file,
pred_summaries=contrib_wildcard.replace("*/", "").split(","),
batch_size=batch_size,
scale_contribution=scale_contribution,
flip_negative_strand=flip_negative_strand,
chromosomes=None) # infer chromosomes from the fasta file
def __getitem__(self, idx):
from pybedtools import Interval
if self.fasta_extractor is None:
# first call
# Use normal fasta/bigwig extractors
self.fasta_extractor = FastaExtractor(self.ds.fasta_file, use_strand=True)
self.bw_extractors = {task: [BigwigExtractor(track) for track in task_spec.tracks]
for task, task_spec in self.ds.task_specs.items() if task in self.tasks}
self.bias_bw_extractors = {task: [BigwigExtractor(track) for track in task_spec.tracks]
for task, task_spec in self.ds.bias_specs.items()}
# Get the genomic interval for that particular datapoint
interval = Interval(self.dfm.iat[idx, 0], # chrom
self.dfm.iat[idx, 1], # start
self.dfm.iat[idx, 2]) # end
# Transform the input interval (for say augmentation...)
if self.interval_transformer is not None:
interval = self.interval_transformer(interval)
# resize the intervals to the desired widths
target_interval = resize_interval(deepcopy(interval), self.peak_width)
seq_interval = resize_interval(deepcopy(interval), self.seq_width)
# This only kicks in when we specify the taskname from dataspec
# to the 3rd column. E.g. it doesn't apply when using intervals_file
interval_from_task = self.dfm.iat[idx, 3] if self.intervals_file is None else ''
# extract DNA sequence + one-hot encode it
sequence = self.fasta_extractor([seq_interval])[0]
inputs = {"seq": sequence}
# exctract the profile counts from the bigwigs
cuts = {f"{task}/profile": _run_extractors(self.bw_extractors[task],
[target_interval],
sum_tracks=spec.sum_tracks)[0]
for task, spec in self.ds.task_specs.items() if task in self.tasks}
if self.track_transform is not None:
for task in self.tasks:
cuts[f'{task}/profile'] = self.track_transform(cuts[f'{task}/profile'])
# Add total number of counts
for task in self.tasks:
cuts[f'{task}/counts'] = self.total_count_transform(cuts[f'{task}/profile'].sum(0))
if len(self.ds.bias_specs) > 0:
# Extract the bias tracks
biases = {bias_task: _run_extractors(self.bias_bw_extractors[bias_task],
[target_interval],
sum_tracks=spec.sum_tracks)[0]
for bias_task, spec in self.ds.bias_specs.items()}
task_biases = {f"bias/{task}/profile": np.concatenate([biases[bt]
for bt in self.task_bias_tracks[task]],
axis=-1)
for task in self.tasks}
if self.track_transform is not None:
for task in self.tasks:
task_biases[f'bias/{task}/profile'] = self.track_transform(task_biases[f'bias/{task}/profile'])
# Add total number of bias counts
for task in self.tasks:
task_biases[f'bias/{task}/counts'] = self.total_count_transform(task_biases[f'bias/{task}/profile'].sum(0))
inputs = {**inputs, **task_biases}
if self.include_classes:
# Optionally, add binary labels from the additional columns in the tsv intervals file
classes = {f"{task}/class": self.dfm.iat[idx, i + 3]
for i, task in enumerate(self.dfm_tasks) if task in self.tasks}
cuts = {**cuts, **classes}
out = {"inputs": inputs,
"targets": cuts}
if self.include_metadata:
# remember the metadata (what genomic interval was used)
out['metadata'] = {"range": GenomicRanges(chr=target_interval.chrom,
start=target_interval.start,
end=target_interval.stop,
id=idx,
strand=(target_interval.strand
if target_interval.strand is not None
else "*"),
),
"interval_from_task": interval_from_task}
return out
