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# Copyright (c) Facebook, Inc. and its affiliates. All Rights Reserved
import functools
import logging
import os
import sys
from termcolor import colored
class _ColorfulFormatter(logging.Formatter):
def __init__(self, *args, **kwargs):
self._root_name = kwargs.pop("root_name") + "."
self._abbrev_name = kwargs.pop("abbrev_name", "")
if len(self._abbrev_name):
self._abbrev_name = self._abbrev_name + "."
super(_ColorfulFormatter, self).__init__(*args, **kwargs)
def formatMessage(self, record):
record.name = record.name.replace(self._root_name, self._abbrev_name)
log = super(_ColorfulFormatter, self).formatMessage(record)
if record.levelno == logging.WARNING:
prefix = colored("WARNING", "red", attrs=["blink"])
elif record.levelno == logging.ERROR or record.levelno == logging.CRITICAL:
prefix = colored("ERROR", "red", attrs=["blink", "underline"])
else:
return log
return prefix + " " + log
# so that calling setup_logger multiple times won't add many handlers
@functools.lru_cache()
def setup_logger(output=None, distributed_rank=0, *, color=True, name="imagenet", abbrev_name=None):
"""
Initialize the detectron2 logger and set its verbosity level to "INFO".
Args:
output (str): a file name or a directory to save log. If None, will not save log file.
If ends with ".txt" or ".log", assumed to be a file name.
Otherwise, logs will be saved to `output/log.txt`.
name (str): the root module name of this logger
Returns:
logging.Logger: a logger
"""
logger = logging.getLogger(name)
logger.setLevel(logging.DEBUG)
logger.propagate = False
if abbrev_name is None:
abbrev_name = name
plain_formatter = logging.Formatter(
"[%(asctime)s.%(msecs)03d]: %(message)s", datefmt="%m/%d %H:%M:%S"
)
# stdout logging: master only
if distributed_rank == 0:
ch = logging.StreamHandler(stream=sys.stdout)
ch.setLevel(logging.DEBUG)
if color:
formatter = _ColorfulFormatter(
colored("[%(asctime)s.%(msecs)03d]: ", "green") + "%(message)s",
datefmt="%m/%d %H:%M:%S",
root_name=name,
abbrev_name=str(abbrev_name),
)
else:
formatter = plain_formatter
ch.setFormatter(formatter)
logger.addHandler(ch)
# file logging: all workers
if output is not None:
if output.endswith(".txt") or output.endswith(".log"):
filename = output
else:
filename = os.path.join(output, "log.txt")
if distributed_rank > 0:
filename = filename + f".rank{distributed_rank}"
os.makedirs(os.path.dirname(filename), exist_ok=True)
fh = logging.StreamHandler(_cached_log_stream(filename))
fh.setLevel(logging.DEBUG)
fh.setFormatter(plain_formatter)
logger.addHandler(fh)
return logger
# cache the opened file object, so that different calls to `setup_logger`
# with the same file name can safely write to the same file.
@functools.lru_cache(maxsize=None)
def _cached_log_stream(filename):
return open(filename, "a")
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