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# Copyright (c) OpenMMLab. All rights reserved.
import os
import random
import sys
import time
import warnings
from getpass import getuser
from socket import gethostname
import numpy as np
import torch
import annotator.mmpkg.mmcv as mmcv
def get_host_info():
"""Get hostname and username.
Return empty string if exception raised, e.g. ``getpass.getuser()`` will
lead to error in docker container
"""
host = ''
try:
host = f'{getuser()}@{gethostname()}'
except Exception as e:
warnings.warn(f'Host or user not found: {str(e)}')
finally:
return host
def get_time_str():
return time.strftime('%Y%m%d_%H%M%S', time.localtime())
def obj_from_dict(info, parent=None, default_args=None):
"""Initialize an object from dict.
The dict must contain the key "type", which indicates the object type, it
can be either a string or type, such as "list" or ``list``. Remaining
fields are treated as the arguments for constructing the object.
Args:
info (dict): Object types and arguments.
parent (:class:`module`): Module which may containing expected object
classes.
default_args (dict, optional): Default arguments for initializing the
object.
Returns:
any type: Object built from the dict.
"""
assert isinstance(info, dict) and 'type' in info
assert isinstance(default_args, dict) or default_args is None
args = info.copy()
obj_type = args.pop('type')
if mmcv.is_str(obj_type):
if parent is not None:
obj_type = getattr(parent, obj_type)
else:
obj_type = sys.modules[obj_type]
elif not isinstance(obj_type, type):
raise TypeError('type must be a str or valid type, but '
f'got {type(obj_type)}')
if default_args is not None:
for name, value in default_args.items():
args.setdefault(name, value)
return obj_type(**args)
def set_random_seed(seed, deterministic=False, use_rank_shift=False):
"""Set random seed.
Args:
seed (int): Seed to be used.
deterministic (bool): Whether to set the deterministic option for
CUDNN backend, i.e., set `torch.backends.cudnn.deterministic`
to True and `torch.backends.cudnn.benchmark` to False.
Default: False.
rank_shift (bool): Whether to add rank number to the random seed to
have different random seed in different threads. Default: False.
"""
if use_rank_shift:
rank, _ = mmcv.runner.get_dist_info()
seed += rank
random.seed(seed)
np.random.seed(seed)
torch.manual_seed(seed)
torch.cuda.manual_seed(seed)
torch.cuda.manual_seed_all(seed)
os.environ['PYTHONHASHSEED'] = str(seed)
if deterministic:
torch.backends.cudnn.deterministic = True
torch.backends.cudnn.benchmark = False
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