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Commit 2f0d89e7 authored by zhuwenwen's avatar zhuwenwen
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remove duplicated code

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alphafold/data/pipeline.py deleted 100644 → 0
View file @ a1597f3f
# Copyright 2021 DeepMind Technologies Limited
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""Functions for building the input features for the AlphaFold model."""
import os
# Internal import (7716).
from typing import Any, Mapping, MutableMapping, Optional, Sequence, Union
from absl import logging
from alphafold.common import residue_constants
from alphafold.data import msa_identifiers
from alphafold.data import parsers
from alphafold.data import templates
from alphafold.data.tools import hhblits
from alphafold.data.tools import hhsearch
from alphafold.data.tools import hmmsearch
from alphafold.data.tools import jackhmmer
import numpy as np
FeatureDict = MutableMapping[str, np.ndarray]
TemplateSearcher = Union[hhsearch.HHSearch, hmmsearch.Hmmsearch]
def make_sequence_features(
sequence: str, description: str, num_res: int) -> FeatureDict:
"""Constructs a feature dict of sequence features."""
features = {}
features['aatype'] = residue_constants.sequence_to_onehot(
sequence=sequence,
mapping=residue_constants.restype_order_with_x,
map_unknown_to_x=True)
features['between_segment_residues'] = np.zeros((num_res,), dtype=np.int32)
features['domain_name'] = np.array([description.encode('utf-8')],
dtype=np.object_)
features['residue_index'] = np.array(range(num_res), dtype=np.int32)
features['seq_length'] = np.array([num_res] * num_res, dtype=np.int32)
features['sequence'] = np.array([sequence.encode('utf-8')], dtype=np.object_)
return features
def make_msa_features(msas: Sequence[parsers.Msa]) -> FeatureDict:
"""Constructs a feature dict of MSA features."""
if not msas:
raise ValueError('At least one MSA must be provided.')
int_msa = []
deletion_matrix = []
species_ids = []
seen_sequences = set()
for msa_index, msa in enumerate(msas):
if not msa:
raise ValueError(f'MSA {msa_index} must contain at least one sequence.')
for sequence_index, sequence in enumerate(msa.sequences):
if sequence in seen_sequences:
continue
seen_sequences.add(sequence)
int_msa.append(
[residue_constants.HHBLITS_AA_TO_ID[res] for res in sequence])
deletion_matrix.append(msa.deletion_matrix[sequence_index])
identifiers = msa_identifiers.get_identifiers(
msa.descriptions[sequence_index])
species_ids.append(identifiers.species_id.encode('utf-8'))
num_res = len(msas[0].sequences[0])
num_alignments = len(int_msa)
features = {}
features['deletion_matrix_int'] = np.array(deletion_matrix, dtype=np.int32)
features['msa'] = np.array(int_msa, dtype=np.int32)
features['num_alignments'] = np.array(
[num_alignments] * num_res, dtype=np.int32)
features['msa_species_identifiers'] = np.array(species_ids, dtype=np.object_)
return features
def run_msa_tool(msa_runner, input_fasta_path: str, msa_out_path: str,
msa_format: str, use_precomputed_msas: bool,
max_sto_sequences: Optional[int] = None
) -> Mapping[str, Any]:
"""Runs an MSA tool, checking if output already exists first."""
if not use_precomputed_msas or not os.path.exists(msa_out_path):
if msa_format == 'sto' and max_sto_sequences is not None:
result = msa_runner.query(input_fasta_path, max_sto_sequences)[0] # pytype: disable=wrong-arg-count
else:
result = msa_runner.query(input_fasta_path)[0]
with open(msa_out_path, 'w') as f:
f.write(result[msa_format])
else:
logging.warning('Reading MSA from file %s', msa_out_path)
if msa_format == 'sto' and max_sto_sequences is not None:
precomputed_msa = parsers.truncate_stockholm_msa(
msa_out_path, max_sto_sequences)
result = {'sto': precomputed_msa}
else:
with open(msa_out_path, 'r') as f:
result = {msa_format: f.read()}
return result
class DataPipeline:
"""Runs the alignment tools and assembles the input features."""
def __init__(self,
jackhmmer_binary_path: str,
hhblits_binary_path: str,
uniref90_database_path: str,
mgnify_database_path: str,
bfd_database_path: Optional[str],
uniclust30_database_path: Optional[str],
small_bfd_database_path: Optional[str],
template_searcher: TemplateSearcher,
template_featurizer: templates.TemplateHitFeaturizer,
use_small_bfd: bool,
mgnify_max_hits: int = 501,
uniref_max_hits: int = 10000,
use_precomputed_msas: bool = False):
"""Initializes the data pipeline."""
self._use_small_bfd = use_small_bfd
self.jackhmmer_uniref90_runner = jackhmmer.Jackhmmer(
binary_path=jackhmmer_binary_path,
database_path=uniref90_database_path)
if use_small_bfd:
self.jackhmmer_small_bfd_runner = jackhmmer.Jackhmmer(
binary_path=jackhmmer_binary_path,
database_path=small_bfd_database_path)
else:
self.hhblits_bfd_uniclust_runner = hhblits.HHBlits(
binary_path=hhblits_binary_path,
databases=[bfd_database_path, uniclust30_database_path])
self.jackhmmer_mgnify_runner = jackhmmer.Jackhmmer(
binary_path=jackhmmer_binary_path,
database_path=mgnify_database_path)
self.template_searcher = template_searcher
self.template_featurizer = template_featurizer
self.mgnify_max_hits = mgnify_max_hits
self.uniref_max_hits = uniref_max_hits
self.use_precomputed_msas = use_precomputed_msas
def process(self, input_fasta_path: str, msa_output_dir: str) -> FeatureDict:
"""Runs alignment tools on the input sequence and creates features."""
with open(input_fasta_path) as f:
input_fasta_str = f.read()
input_seqs, input_descs = parsers.parse_fasta(input_fasta_str)
if len(input_seqs) != 1:
raise ValueError(
f'More than one input sequence found in {input_fasta_path}.')
input_sequence = input_seqs[0]
input_description = input_descs[0]
num_res = len(input_sequence)
uniref90_out_path = os.path.join(msa_output_dir, 'uniref90_hits.sto')
jackhmmer_uniref90_result = run_msa_tool(
msa_runner=self.jackhmmer_uniref90_runner,
input_fasta_path=input_fasta_path,
msa_out_path=uniref90_out_path,
msa_format='sto',
use_precomputed_msas=self.use_precomputed_msas,
max_sto_sequences=self.uniref_max_hits)
mgnify_out_path = os.path.join(msa_output_dir, 'mgnify_hits.sto')
jackhmmer_mgnify_result = run_msa_tool(
msa_runner=self.jackhmmer_mgnify_runner,
input_fasta_path=input_fasta_path,
msa_out_path=mgnify_out_path,
msa_format='sto',
use_precomputed_msas=self.use_precomputed_msas,
max_sto_sequences=self.mgnify_max_hits)
msa_for_templates = jackhmmer_uniref90_result['sto']
msa_for_templates = parsers.deduplicate_stockholm_msa(msa_for_templates)
msa_for_templates = parsers.remove_empty_columns_from_stockholm_msa(
msa_for_templates)
if self.template_searcher.input_format == 'sto':
pdb_templates_result = self.template_searcher.query(msa_for_templates)
elif self.template_searcher.input_format == 'a3m':
uniref90_msa_as_a3m = parsers.convert_stockholm_to_a3m(msa_for_templates)
pdb_templates_result = self.template_searcher.query(uniref90_msa_as_a3m)
else:
raise ValueError('Unrecognized template input format: '
f'{self.template_searcher.input_format}')
pdb_hits_out_path = os.path.join(
msa_output_dir, f'pdb_hits.{self.template_searcher.output_format}')
with open(pdb_hits_out_path, 'w') as f:
f.write(pdb_templates_result)
uniref90_msa = parsers.parse_stockholm(jackhmmer_uniref90_result['sto'])
mgnify_msa = parsers.parse_stockholm(jackhmmer_mgnify_result['sto'])
pdb_template_hits = self.template_searcher.get_template_hits(
output_string=pdb_templates_result, input_sequence=input_sequence)
if self._use_small_bfd:
bfd_out_path = os.path.join(msa_output_dir, 'small_bfd_hits.sto')
jackhmmer_small_bfd_result = run_msa_tool(
msa_runner=self.jackhmmer_small_bfd_runner,
input_fasta_path=input_fasta_path,
msa_out_path=bfd_out_path,
msa_format='sto',
use_precomputed_msas=self.use_precomputed_msas)
bfd_msa = parsers.parse_stockholm(jackhmmer_small_bfd_result['sto'])
else:
bfd_out_path = os.path.join(msa_output_dir, 'bfd_uniclust_hits.a3m')
hhblits_bfd_uniclust_result = run_msa_tool(
msa_runner=self.hhblits_bfd_uniclust_runner,
input_fasta_path=input_fasta_path,
msa_out_path=bfd_out_path,
msa_format='a3m',
use_precomputed_msas=self.use_precomputed_msas)
bfd_msa = parsers.parse_a3m(hhblits_bfd_uniclust_result['a3m'])
templates_result = self.template_featurizer.get_templates(
query_sequence=input_sequence,
hits=pdb_template_hits)
sequence_features = make_sequence_features(
sequence=input_sequence,
description=input_description,
num_res=num_res)
msa_features = make_msa_features((uniref90_msa, bfd_msa, mgnify_msa))
logging.info('Uniref90 MSA size: %d sequences.', len(uniref90_msa))
logging.info('BFD MSA size: %d sequences.', len(bfd_msa))
logging.info('MGnify MSA size: %d sequences.', len(mgnify_msa))
logging.info('Final (deduplicated) MSA size: %d sequences.',
msa_features['num_alignments'][0])
logging.info('Total number of templates (NB: this can include bad '
'templates and is later filtered to top 4): %d.',
templates_result.features['template_domain_names'].shape[0])
return {**sequence_features, **msa_features, **templates_result.features}
alphafold/data/pipeline_multimer.py deleted 100644 → 0
View file @ a1597f3f
# Copyright 2021 DeepMind Technologies Limited
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""Functions for building the features for the AlphaFold multimer model."""
import collections
import contextlib
import copy
import dataclasses
import json
import os
import tempfile
from typing import Mapping, MutableMapping, Sequence
from absl import logging
from alphafold.common import protein
from alphafold.common import residue_constants
from alphafold.data import feature_processing
from alphafold.data import msa_pairing
from alphafold.data import parsers
from alphafold.data import pipeline
from alphafold.data.tools import jackhmmer
import numpy as np
# Internal import (7716).
@dataclasses.dataclass(frozen=True)
class _FastaChain:
sequence: str
description: str
def _make_chain_id_map(*,
sequences: Sequence[str],
descriptions: Sequence[str],
) -> Mapping[str, _FastaChain]:
"""Makes a mapping from PDB-format chain ID to sequence and description."""
if len(sequences) != len(descriptions):
raise ValueError('sequences and descriptions must have equal length. '
f'Got {len(sequences)} != {len(descriptions)}.')
if len(sequences) > protein.PDB_MAX_CHAINS:
raise ValueError('Cannot process more chains than the PDB format supports. '
f'Got {len(sequences)} chains.')
chain_id_map = {}
for chain_id, sequence, description in zip(
protein.PDB_CHAIN_IDS, sequences, descriptions):
chain_id_map[chain_id] = _FastaChain(
sequence=sequence, description=description)
return chain_id_map
@contextlib.contextmanager
def temp_fasta_file(fasta_str: str):
with tempfile.NamedTemporaryFile('w', suffix='.fasta') as fasta_file:
fasta_file.write(fasta_str)
fasta_file.seek(0)
yield fasta_file.name
def convert_monomer_features(
monomer_features: pipeline.FeatureDict,
chain_id: str) -> pipeline.FeatureDict:
"""Reshapes and modifies monomer features for multimer models."""
converted = {}
converted['auth_chain_id'] = np.asarray(chain_id, dtype=np.object_)
unnecessary_leading_dim_feats = {
'sequence', 'domain_name', 'num_alignments', 'seq_length'}
for feature_name, feature in monomer_features.items():
if feature_name in unnecessary_leading_dim_feats:
# asarray ensures it's a np.ndarray.
feature = np.asarray(feature[0], dtype=feature.dtype)
elif feature_name == 'aatype':
# The multimer model performs the one-hot operation itself.
feature = np.argmax(feature, axis=-1).astype(np.int32)
elif feature_name == 'template_aatype':
feature = np.argmax(feature, axis=-1).astype(np.int32)
new_order_list = residue_constants.MAP_HHBLITS_AATYPE_TO_OUR_AATYPE
feature = np.take(new_order_list, feature.astype(np.int32), axis=0)
elif feature_name == 'template_all_atom_masks':
feature_name = 'template_all_atom_mask'
converted[feature_name] = feature
return converted
def int_id_to_str_id(num: int) -> str:
"""Encodes a number as a string, using reverse spreadsheet style naming.
Args:
num: A positive integer.
Returns:
A string that encodes the positive integer using reverse spreadsheet style,
naming e.g. 1 = A, 2 = B, ..., 27 = AA, 28 = BA, 29 = CA, ... This is the
usual way to encode chain IDs in mmCIF files.
"""
if num <= 0:
raise ValueError(f'Only positive integers allowed, got {num}.')
num = num - 1 # 1-based indexing.
output = []
while num >= 0:
output.append(chr(num % 26 + ord('A')))
num = num // 26 - 1
return ''.join(output)
def add_assembly_features(
all_chain_features: MutableMapping[str, pipeline.FeatureDict],
) -> MutableMapping[str, pipeline.FeatureDict]:
"""Add features to distinguish between chains.
Args:
all_chain_features: A dictionary which maps chain_id to a dictionary of
features for each chain.
Returns:
all_chain_features: A dictionary which maps strings of the form
`<seq_id>_<sym_id>` to the corresponding chain features. E.g. two
chains from a homodimer would have keys A_1 and A_2. Two chains from a
heterodimer would have keys A_1 and B_1.
"""
# Group the chains by sequence
seq_to_entity_id = {}
grouped_chains = collections.defaultdict(list)
for chain_id, chain_features in all_chain_features.items():
seq = str(chain_features['sequence'])
if seq not in seq_to_entity_id:
seq_to_entity_id[seq] = len(seq_to_entity_id) + 1
grouped_chains[seq_to_entity_id[seq]].append(chain_features)
new_all_chain_features = {}
chain_id = 1
for entity_id, group_chain_features in grouped_chains.items():
for sym_id, chain_features in enumerate(group_chain_features, start=1):
new_all_chain_features[
f'{int_id_to_str_id(entity_id)}_{sym_id}'] = chain_features
seq_length = chain_features['seq_length']
chain_features['asym_id'] = chain_id * np.ones(seq_length)
chain_features['sym_id'] = sym_id * np.ones(seq_length)
chain_features['entity_id'] = entity_id * np.ones(seq_length)
chain_id += 1
return new_all_chain_features
def pad_msa(np_example, min_num_seq):
np_example = dict(np_example)
num_seq = np_example['msa'].shape[0]
if num_seq < min_num_seq:
for feat in ('msa', 'deletion_matrix', 'bert_mask', 'msa_mask'):
np_example[feat] = np.pad(
np_example[feat], ((0, min_num_seq - num_seq), (0, 0)))
np_example['cluster_bias_mask'] = np.pad(
np_example['cluster_bias_mask'], ((0, min_num_seq - num_seq),))
return np_example
class DataPipeline:
"""Runs the alignment tools and assembles the input features."""
def __init__(self,
monomer_data_pipeline: pipeline.DataPipeline,
jackhmmer_binary_path: str,
uniprot_database_path: str,
max_uniprot_hits: int = 50000,
use_precomputed_msas: bool = False):
"""Initializes the data pipeline.
Args:
monomer_data_pipeline: An instance of pipeline.DataPipeline - that runs
the data pipeline for the monomer AlphaFold system.
jackhmmer_binary_path: Location of the jackhmmer binary.
uniprot_database_path: Location of the unclustered uniprot sequences, that
will be searched with jackhmmer and used for MSA pairing.
max_uniprot_hits: The maximum number of hits to return from uniprot.
use_precomputed_msas: Whether to use pre-existing MSAs; see run_alphafold.
"""
self._monomer_data_pipeline = monomer_data_pipeline
self._uniprot_msa_runner = jackhmmer.Jackhmmer(
binary_path=jackhmmer_binary_path,
database_path=uniprot_database_path)
self._max_uniprot_hits = max_uniprot_hits
self.use_precomputed_msas = use_precomputed_msas
def _process_single_chain(
self,
chain_id: str,
sequence: str,
description: str,
msa_output_dir: str,
is_homomer_or_monomer: bool) -> pipeline.FeatureDict:
"""Runs the monomer pipeline on a single chain."""
chain_fasta_str = f'>chain_{chain_id}\n{sequence}\n'
chain_msa_output_dir = os.path.join(msa_output_dir, chain_id)
if not os.path.exists(chain_msa_output_dir):
os.makedirs(chain_msa_output_dir)
with temp_fasta_file(chain_fasta_str) as chain_fasta_path:
logging.info('Running monomer pipeline on chain %s: %s',
chain_id, description)
chain_features = self._monomer_data_pipeline.process(
input_fasta_path=chain_fasta_path,
msa_output_dir=chain_msa_output_dir)
# We only construct the pairing features if there are 2 or more unique
# sequences.
if not is_homomer_or_monomer:
all_seq_msa_features = self._all_seq_msa_features(chain_fasta_path,
chain_msa_output_dir)
chain_features.update(all_seq_msa_features)
return chain_features
def _all_seq_msa_features(self, input_fasta_path, msa_output_dir):
"""Get MSA features for unclustered uniprot, for pairing."""
out_path = os.path.join(msa_output_dir, 'uniprot_hits.sto')
result = pipeline.run_msa_tool(
self._uniprot_msa_runner, input_fasta_path, out_path, 'sto',
self.use_precomputed_msas)
msa = parsers.parse_stockholm(result['sto'])
msa = msa.truncate(max_seqs=self._max_uniprot_hits)
all_seq_features = pipeline.make_msa_features([msa])
valid_feats = msa_pairing.MSA_FEATURES + (
'msa_species_identifiers',
)
feats = {f'{k}_all_seq': v for k, v in all_seq_features.items()
if k in valid_feats}
return feats
def process(self,
input_fasta_path: str,
msa_output_dir: str) -> pipeline.FeatureDict:
"""Runs alignment tools on the input sequences and creates features."""
with open(input_fasta_path) as f:
input_fasta_str = f.read()
input_seqs, input_descs = parsers.parse_fasta(input_fasta_str)
chain_id_map = _make_chain_id_map(sequences=input_seqs,
descriptions=input_descs)
chain_id_map_path = os.path.join(msa_output_dir, 'chain_id_map.json')
with open(chain_id_map_path, 'w') as f:
chain_id_map_dict = {chain_id: dataclasses.asdict(fasta_chain)
for chain_id, fasta_chain in chain_id_map.items()}
json.dump(chain_id_map_dict, f, indent=4, sort_keys=True)
all_chain_features = {}
sequence_features = {}
is_homomer_or_monomer = len(set(input_seqs)) == 1
for chain_id, fasta_chain in chain_id_map.items():
if fasta_chain.sequence in sequence_features:
all_chain_features[chain_id] = copy.deepcopy(
sequence_features[fasta_chain.sequence])
continue
chain_features = self._process_single_chain(
chain_id=chain_id,
sequence=fasta_chain.sequence,
description=fasta_chain.description,
msa_output_dir=msa_output_dir,
is_homomer_or_monomer=is_homomer_or_monomer)
chain_features = convert_monomer_features(chain_features,
chain_id=chain_id)
all_chain_features[chain_id] = chain_features
sequence_features[fasta_chain.sequence] = chain_features
all_chain_features = add_assembly_features(all_chain_features)
np_example = feature_processing.pair_and_merge(
all_chain_features=all_chain_features)
# Pad MSA to avoid zero-sized extra_msa.
np_example = pad_msa(np_example, 512)
return np_example
alphafold/data/templates.py deleted 100644 → 0
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alphafold/data/tools/__init__.py deleted 100644 → 0
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# Copyright 2021 DeepMind Technologies Limited
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""Python wrappers for third party tools."""
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alphafold/data/tools/jackhmmer.py deleted 100644 → 0
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alphafold/data/tools/utils.py deleted 100644 → 0
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# Copyright 2021 DeepMind Technologies Limited
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""Common utilities for data pipeline tools."""
import contextlib
import shutil
import tempfile
import time
from typing import Optional
from absl import logging
@contextlib.contextmanager
def tmpdir_manager(base_dir: Optional[str] = None):
"""Context manager that deletes a temporary directory on exit."""
tmpdir = tempfile.mkdtemp(dir=base_dir)
try:
yield tmpdir
finally:
shutil.rmtree(tmpdir, ignore_errors=True)
@contextlib.contextmanager
def timing(msg: str):
logging.info('Started %s', msg)
tic = time.time()
yield
toc = time.time()
logging.info('Finished %s in %.3f seconds', msg, toc - tic)
alphafold/model/__init__.py deleted 100644 → 0
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# Copyright 2021 DeepMind Technologies Limited
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""Alphafold model."""
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