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| # Copyright (c) OpenMMLab. All rights reserved. | |
| import logging | |
| import torch.distributed as dist | |
| logger_initialized = {} | |
| def get_logger(name, log_file=None, log_level=logging.INFO, file_mode='w'): | |
| """Initialize and get a logger by name. | |
| If the logger has not been initialized, this method will initialize the | |
| logger by adding one or two handlers, otherwise the initialized logger will | |
| be directly returned. During initialization, a StreamHandler will always be | |
| added. If `log_file` is specified and the process rank is 0, a FileHandler | |
| will also be added. | |
| Args: | |
| name (str): Logger name. | |
| log_file (str | None): The log filename. If specified, a FileHandler | |
| will be added to the logger. | |
| log_level (int): The logger level. Note that only the process of | |
| rank 0 is affected, and other processes will set the level to | |
| "Error" thus be silent most of the time. | |
| file_mode (str): The file mode used in opening log file. | |
| Defaults to 'w'. | |
| Returns: | |
| logging.Logger: The expected logger. | |
| """ | |
| logger = logging.getLogger(name) | |
| if name in logger_initialized: | |
| return logger | |
| # handle hierarchical names | |
| # e.g., logger "a" is initialized, then logger "a.b" will skip the | |
| # initialization since it is a child of "a". | |
| for logger_name in logger_initialized: | |
| if name.startswith(logger_name): | |
| return logger | |
| # handle duplicate logs to the console | |
| # Starting in 1.8.0, PyTorch DDP attaches a StreamHandler <stderr> (NOTSET) | |
| # to the root logger. As logger.propagate is True by default, this root | |
| # level handler causes logging messages from rank>0 processes to | |
| # unexpectedly show up on the console, creating much unwanted clutter. | |
| # To fix this issue, we set the root logger's StreamHandler, if any, to log | |
| # at the ERROR level. | |
| for handler in logger.root.handlers: | |
| if type(handler) is logging.StreamHandler: | |
| handler.setLevel(logging.ERROR) | |
| stream_handler = logging.StreamHandler() | |
| handlers = [stream_handler] | |
| if dist.is_available() and dist.is_initialized(): | |
| rank = dist.get_rank() | |
| else: | |
| rank = 0 | |
| # only rank 0 will add a FileHandler | |
| if rank == 0 and log_file is not None: | |
| # Here, the default behaviour of the official logger is 'a'. Thus, we | |
| # provide an interface to change the file mode to the default | |
| # behaviour. | |
| file_handler = logging.FileHandler(log_file, file_mode) | |
| handlers.append(file_handler) | |
| formatter = logging.Formatter( | |
| '%(asctime)s - %(name)s - %(levelname)s - %(message)s') | |
| for handler in handlers: | |
| handler.setFormatter(formatter) | |
| handler.setLevel(log_level) | |
| logger.addHandler(handler) | |
| if rank == 0: | |
| logger.setLevel(log_level) | |
| else: | |
| logger.setLevel(logging.ERROR) | |
| logger_initialized[name] = True | |
| return logger | |
| def print_log(msg, logger=None, level=logging.INFO): | |
| """Print a log message. | |
| Args: | |
| msg (str): The message to be logged. | |
| logger (logging.Logger | str | None): The logger to be used. | |
| Some special loggers are: | |
| - "silent": no message will be printed. | |
| - other str: the logger obtained with `get_root_logger(logger)`. | |
| - None: The `print()` method will be used to print log messages. | |
| level (int): Logging level. Only available when `logger` is a Logger | |
| object or "root". | |
| """ | |
| if logger is None: | |
| print(msg) | |
| elif isinstance(logger, logging.Logger): | |
| logger.log(level, msg) | |
| elif logger == 'silent': | |
| pass | |
| elif isinstance(logger, str): | |
| _logger = get_logger(logger) | |
| _logger.log(level, msg) | |
| else: | |
| raise TypeError( | |
| 'logger should be either a logging.Logger object, str, ' | |
| f'"silent" or None, but got {type(logger)}') | |