Files
cellxgene/server/common/genesets.py
atarashansky 6505f6cbf5 chore: upgrade backend dependencies (#2641)
chore: upgrade backend dependencies (#2641)
2023-11-29 14:16:39 -08:00

240 lines
9.0 KiB
Python

"""
Utility code for gene sets handling
"""
import re
import csv
import hashlib
from .errors import AnnotationsError
GENESETS_TIDYCSV_HEADER = [
"gene_set_name",
"gene_set_description",
"gene_symbol",
"gene_description",
]
def read_gene_sets_tidycsv(gs_locator, context=None):
"""
Read & parse the Tidy CSV format, applying validation checks for mandatory
values, and de-duping rules.
Format is a four-column CSV, with a mandatory header row, and optional "#" prefixed
comments. Format:
gene_set_name, gene_set_description, gene_symbol, gene_description
gene_set_name must be non-null; others are optional.
Returns: a dictionary of the shape (values in angle-brackets vary):
{
<string, a gene set name>: {
"geneset_name": <string, a gene set name>,
"geneset_description": <a string or None>,
"genes": [
{
"gene_symbol": <string, a gene symbol or name>,
"gene_description": <a string or None>
},
...
]
},
...
}
"""
class myDialect(csv.excel):
skipinitialspace = False
def just(n, seq):
it = iter(seq)
for _ in range(n - 1):
yield next(it, "")
yield tuple(it)
messagefn = context["messagefn"] if context else (lambda x: None)
gene_sets = {}
with gs_locator.local_handle() as fname:
with open(fname, newline="") as f:
reader = csv.reader(f, dialect=myDialect())
haveReadHeader = False
lineno = 0
for row in reader:
lineno += 1
# ignore empty rows
if len(row) == 0:
continue
# if row starts with '#' it is a comment
if row[0].startswith("#"):
continue
# if this is the first non-comment row, assume it is a header and validate
# column names. OK if the user has extra columns after our initial set.
if not haveReadHeader:
if row[0 : len(GENESETS_TIDYCSV_HEADER)] != GENESETS_TIDYCSV_HEADER:
raise AnnotationsError("Gene set CSV file missing the required column header.")
haveReadHeader = True
continue
geneset_name, geneset_description, gene_symbol, gene_description, _ = just(5, row)
if not geneset_name:
raise AnnotationsError(f"Gene set CSV missing required gene set name on line {lineno}")
if (not gene_symbol) and gene_description:
messagefn(f"Warning: Missing gene name in gene set name {geneset_name} on line {lineno}.")
if geneset_name in gene_sets:
gs = gene_sets[geneset_name]
else:
gs = gene_sets[geneset_name] = {
"geneset_name": geneset_name,
"geneset_description": geneset_description,
"genes": [],
}
# Use first geneset_description with a value
if not gs["geneset_description"] and geneset_description:
gs["geneset_description"] = geneset_description
# add the gene if the gene_symbol is defined
if gene_symbol:
gs["genes"].append(
{
"gene_symbol": gene_symbol,
"gene_description": gene_description,
}
)
return gene_sets
def write_gene_sets_tidycsv(f, genesets):
"""
Convert the internal gene sets format (returned by read_gene_set_tidycsv) into
the simple Tidy CSV.
"""
writer = csv.writer(f, dialect="excel")
writer.writerow(GENESETS_TIDYCSV_HEADER)
for geneset in genesets:
# genes may be empty, in which case we skip the gene set entirely
genes = geneset["genes"]
if not genes:
writer.writerow([geneset["geneset_name"], geneset.get("geneset_description", ""), "", ""])
else:
writer.writerows(
[
[
geneset["geneset_name"],
geneset.get("geneset_description", ""),
gene["gene_symbol"],
gene.get("gene_description", ""),
]
for gene in genes
]
)
def summarizeQueryHash(raw_query):
"""generate a cache key (hash) from the raw query string"""
return hashlib.sha1(raw_query).hexdigest()
def validate_gene_sets(genesets, var_names, context=None):
"""
Check validity of gene sets, return if correct, else raise error.
May also modify the gene set for conditions that should be resolved,
but which do not warrant a hard error.
Argument gene sets may be either the REST OTA format (list of dicts) or the internal
format (dict of dicts, keyed by the gene set name).
Will return a modified gene sets (eg, remove warnings) of the same type as the
provided argument. Ie, dict->dict, list->list
Rules:
0. All gene set names must be unique. [error]
1. Gene set names must conform to the following: [error]
* Names must be comprised of 1 or more ASCII characters 32-126
* No leading or trailing spaces (ASCII 32)
* No multi-space (ASCII 32) runs
2. Gene symbols must be part of the current var_index. [warning]
If gene symbol is not in the var_index, generate a warning and remove the symbol
from the gene sets.
3. Gene symbols must not be duplicated in a gene set. [warning]
Duplications will be silently de-duped.
Items marked [error] will generate a hard error, causing the validation to fail.
Items marked [warning] will generate a warning, and will be resolved without failing
the validation (typically by removing the offending item from the gene sets).
"""
messagefn = context["messagefn"] if context else (lambda x: None)
# accept genesets args as either the internal (dict) or REST (list) format,
# as they are identical except for the dict being keyed by geneset_name.
if not isinstance(genesets, dict) and not isinstance(genesets, list):
raise ValueError("Gene sets must be either dict or list.")
genesets_iterable = genesets if isinstance(genesets, list) else genesets.values()
# 0. check for uniqueness of geneset names
geneset_names = [gs["geneset_name"] for gs in genesets_iterable]
if len(set(geneset_names)) != len(geneset_names):
raise KeyError("All gene set names must be unique.")
# 1. check gene set character set and format
illegal_name = re.compile(r"^\s| |[\u0000-\u001F\u007F-\uFFFF]|\s$")
for name in geneset_names:
if type(name) is not str or len(name) == 0:
raise KeyError("Gene set names must be non-null string.")
if illegal_name.search(name):
messagefn(
"Error: "
f"Gene set name {name} "
"is not valid. Leading, trailing, and multiple spaces within a name are not allowed."
)
raise KeyError(
"Gene set name is not valid. Leading, trailing, and multiple spaces within a name are not allowed."
)
# 2. & 3. check for duplicate gene symbols, and those not present in the dataset. They will
# generate a warning and be removed.
for geneset in genesets_iterable:
if not isinstance(geneset, dict):
raise ValueError("Each gene set must be a dict.")
geneset_name = geneset["geneset_name"]
genes = geneset["genes"]
if not isinstance(genes, list):
raise ValueError("Gene set genes field must be a list")
geneset.setdefault("geneset_description", "")
gene_symbol_already_seen = set()
new_genes = []
for gene in genes:
gene_symbol = gene["gene_symbol"]
if not isinstance(gene_symbol, str) or len(gene_symbol) == 0:
raise ValueError("Gene symbol must be non-null string.")
if gene_symbol in gene_symbol_already_seen:
# duplicate check
messagefn(
f"Warning: a duplicate of gene {gene_symbol} was found in gene set {geneset_name}, "
"and will be ignored."
)
continue
if gene_symbol not in var_names:
messagefn(
f"Warning: {gene_symbol}, used in gene set {geneset_name}, "
"was not found in the dataset and will be ignored."
)
continue
gene_symbol_already_seen.add(gene_symbol)
gene.setdefault("gene_description", "")
new_genes.append(gene)
geneset["genes"] = new_genes
return genesets