dvc/repo/metrics/show.py
from __future__ import unicode_literals
import errno
import os
import csv
import json
import logging
from jsonpath_ng.ext import parse
from dvc.exceptions import OutputNotFoundError, NoMetricsError
from dvc.utils.compat import builtin_str, open, StringIO, csv_reader
NO_METRICS_FILE_AT_REFERENCE_WARNING = (
"Metrics file '{}' does not exist at the reference '{}'."
)
logger = logging.getLogger(__name__)
def _read_metric_json(fd, json_path):
parser = parse(json_path)
return [x.value for x in parser.find(json.load(fd))]
def _get_values(row):
if isinstance(row, dict):
return list(row.values())
else:
return row
def _do_read_metric_xsv(reader, row, col):
if col is not None and row is not None:
return [reader[row][col]]
elif col is not None:
return [r[col] for r in reader]
elif row is not None:
return _get_values(reader[row])
return [_get_values(r) for r in reader]
def _read_metric_hxsv(fd, hxsv_path, delimiter):
indices = hxsv_path.split(",")
row = indices[0]
row = int(row) if row else None
col = indices[1] if len(indices) > 1 and indices[1] else None
reader = list(csv.DictReader(fd, delimiter=builtin_str(delimiter)))
return _do_read_metric_xsv(reader, row, col)
def _read_metric_xsv(fd, xsv_path, delimiter):
indices = xsv_path.split(",")
row = indices[0]
row = int(row) if row else None
col = int(indices[1]) if len(indices) > 1 and indices[1] else None
reader = list(csv.reader(fd, delimiter=builtin_str(delimiter)))
return _do_read_metric_xsv(reader, row, col)
def _read_typed_metric(typ, xpath, fd):
if typ == "json":
ret = _read_metric_json(fd, xpath)
elif typ == "csv":
ret = _read_metric_xsv(fd, xpath, ",")
elif typ == "tsv":
ret = _read_metric_xsv(fd, xpath, "\t")
elif typ == "hcsv":
ret = _read_metric_hxsv(fd, xpath, ",")
elif typ == "htsv":
ret = _read_metric_hxsv(fd, xpath, "\t")
else:
ret = fd.read().strip()
return ret
def _format_csv(content, delimiter):
"""Format delimited text to have same column width.
Args:
content (str): The content of a metric.
delimiter (str): Value separator
Returns:
str: Formatted content.
Example:
>>> content = (
"value_mse,deviation_mse,data_set\n"
"0.421601,0.173461,train\n"
"0.67528,0.289545,testing\n"
"0.671502,0.297848,validation\n"
)
>>> _format_csv(content, ",")
"value_mse deviation_mse data_set\n"
"0.421601 0.173461 train\n"
"0.67528 0.289545 testing\n"
"0.671502 0.297848 validation\n"
"""
reader = csv_reader(StringIO(content), delimiter=builtin_str(delimiter))
rows = [row for row in reader]
max_widths = [max(map(len, column)) for column in zip(*rows)]
lines = [
" ".join(
"{entry:{width}}".format(entry=entry, width=width + 2)
for entry, width in zip(row, max_widths)
)
for row in rows
]
return "\n".join(lines)
def _format_output(content, typ):
"""Tabularize the content according to its type.
Args:
content (str): The content of a metric.
typ (str): The type of metric -- (raw|json|tsv|htsv|csv|hcsv).
Returns:
str: Content in a raw or tabular format.
"""
if "csv" in str(typ):
return _format_csv(content, delimiter=",")
if "tsv" in str(typ):
return _format_csv(content, delimiter="\t")
return content
def _read_metric(fd, typ=None, xpath=None, fname=None, branch=None):
typ = typ.lower().strip() if typ else typ
try:
if xpath:
return _read_typed_metric(typ, xpath.strip(), fd)
else:
return _format_output(fd.read().strip(), typ)
# Json path library has to be replaced or wrapped in
# order to fix this too broad except clause.
except Exception:
logger.exception(
"unable to read metric in '{}' in branch '{}'".format(
fname, branch
)
)
return None
def _collect_metrics(repo, path, recursive, typ, xpath, branch):
"""Gather all the metric outputs.
Args:
path (str): Path to a metric file or a directory.
recursive (bool): If path is a directory, do a recursive search for
metrics on the given path.
typ (str): The type that will be used to interpret the metric file,
one of the followings - (raw|json|tsv|htsv|csv|hcsv).
xpath (str): Path to search for.
branch (str): Branch to look up for metrics.
Returns:
list(tuple): (output, typ, xpath)
- output:
- typ:
- xpath:
"""
outs = [out for stage in repo.stages() for out in stage.outs]
if path:
try:
outs = repo.find_outs_by_path(path, outs=outs, recursive=recursive)
except OutputNotFoundError:
logger.debug(
"DVC-file not for found for '{}' in branch '{}'".format(
path, branch
)
)
return []
res = []
for o in outs:
if not o.metric:
continue
# NOTE this case assumes that typ has not been provided in CLI call
# and one of the following cases:
# - stage file contains metric type
# - typ will be read from file extension later
if not typ and isinstance(o.metric, dict):
t = o.metric.get(o.PARAM_METRIC_TYPE, typ)
# NOTE user might want to check different xpath, hence xpath first
x = xpath or o.metric.get(o.PARAM_METRIC_XPATH)
else:
t = typ
x = xpath
res.append((o, t, x))
return res
def _read_metrics(repo, metrics, branch):
"""Read the content of each metric file and format it.
Args:
metrics (list): List of metric touples
branch (str): Branch to look up for metrics.
Returns:
A dict mapping keys with metrics path name and content.
For example:
{'metric.csv': ("value_mse deviation_mse data_set\n"
"0.421601 0.173461 train\n"
"0.67528 0.289545 testing\n"
"0.671502 0.297848 validation\n")}
"""
res = {}
for out, typ, xpath in metrics:
assert out.scheme == "local"
if not typ:
typ = os.path.splitext(out.fspath.lower())[1].replace(".", "")
if out.use_cache:
open_fun = open
path = repo.cache.local.get(out.checksum)
else:
open_fun = repo.tree.open
path = out.fspath
try:
with open_fun(path) as fd:
metric = _read_metric(
fd, typ=typ, xpath=xpath, fname=str(out), branch=branch
)
except IOError as e:
if e.errno == errno.ENOENT:
logger.warning(
NO_METRICS_FILE_AT_REFERENCE_WARNING.format(
out.path_info, branch
)
)
metric = None
else:
raise
if not metric:
continue
res[str(out)] = metric
return res
def show(
repo,
targets=None,
typ=None,
xpath=None,
all_branches=False,
all_tags=False,
recursive=False,
):
res = {}
found = set()
if not targets:
# Iterate once to call `_collect_metrics` on all the stages
targets = [None]
for branch in repo.brancher(all_branches=all_branches, all_tags=all_tags):
metrics = {}
for target in targets:
entries = _collect_metrics(
repo, target, recursive, typ, xpath, branch
)
metric = _read_metrics(repo, entries, branch)
if metric:
found.add(target)
metrics.update(metric)
if metrics:
res[branch] = metrics
if not res and not any(targets):
raise NoMetricsError()
missing = set(targets) - found
if missing:
res[None] = missing
return res