330 lines
10 KiB
Python
330 lines
10 KiB
Python
import datetime
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import errno
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import os
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import time
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from collections import defaultdict, deque
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import torch
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import torch.distributed as dist
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class SmoothedValue:
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"""Track a series of values and provide access to smoothed values over a
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window or the global series average.
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"""
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def __init__(self, window_size=20, fmt=None):
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if fmt is None:
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fmt = "{median:.4f} ({global_avg:.4f})"
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self.deque = deque(maxlen=window_size)
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self.total = 0.0
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self.count = 0
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self.fmt = fmt
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def update(self, value, n=1):
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self.deque.append(value)
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self.count += n
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self.total += value * n
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def synchronize_between_processes(self):
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"""
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Warning: does not synchronize the deque!
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"""
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t = reduce_across_processes([self.count, self.total])
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t = t.tolist()
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self.count = int(t[0])
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self.total = t[1]
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@property
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def median(self):
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d = torch.tensor(list(self.deque))
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return d.median().item()
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@property
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def avg(self):
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d = torch.tensor(list(self.deque), dtype=torch.float32)
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return d.mean().item()
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@property
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def global_avg(self):
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return self.total / self.count
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@property
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def max(self):
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return max(self.deque)
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@property
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def value(self):
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return self.deque[-1]
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def __str__(self):
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return self.fmt.format(
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median=self.median, avg=self.avg, global_avg=self.global_avg, max=self.max, value=self.value
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)
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class ConfusionMatrix:
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def __init__(self, num_classes):
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self.num_classes = num_classes
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self.mat = None
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def update(self, a, b):
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n = self.num_classes
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if self.mat is None:
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self.mat = torch.zeros((n, n), dtype=torch.int64, device=a.device)
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with torch.inference_mode():
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k = (a >= 0) & (a < n)
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inds = n * a[k].to(torch.int64) + b[k]
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self.mat += torch.bincount(inds, minlength=n**2).reshape(n, n)
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def reset(self):
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self.mat.zero_()
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def compute(self):
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h = self.mat.float()
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acc_global = torch.diag(h).sum() / h.sum()
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acc = torch.diag(h) / h.sum(1)
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iu = torch.diag(h) / (h.sum(1) + h.sum(0) - torch.diag(h))
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return acc_global, acc, iu
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def reduce_from_all_processes(self):
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reduce_across_processes(self.mat)
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def get_info(self):
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acc_global, acc, iu = self.compute()
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return ("global correct: {:.1f}\naverage row correct: {}\nIoU: {}\nmean IoU: {:.1f}").format(
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acc_global.item() * 100,
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[f"{i:.1f}" for i in (acc * 100).tolist()],
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[f"{i:.1f}" for i in (iu * 100).tolist()],
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iu.mean().item() * 100,
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), iu.mean().item() * 100
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class MetricLogger:
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def __init__(self, delimiter="\t"):
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self.meters = defaultdict(SmoothedValue)
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self.delimiter = delimiter
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def update(self, **kwargs):
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for k, v in kwargs.items():
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if isinstance(v, torch.Tensor):
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v = v.item()
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if not isinstance(v, (float, int)):
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raise TypeError(
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f"This method expects the value of the input arguments to be of type float or int, instead got {type(v)}"
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)
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self.meters[k].update(v)
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def __getattr__(self, attr):
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if attr in self.meters:
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return self.meters[attr]
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if attr in self.__dict__:
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return self.__dict__[attr]
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raise AttributeError(
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f"'{type(self).__name__}' object has no attribute '{attr}'")
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def __str__(self):
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loss_str = []
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for name, meter in self.meters.items():
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loss_str.append(f"{name}: {str(meter)}")
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return self.delimiter.join(loss_str)
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def synchronize_between_processes(self):
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for meter in self.meters.values():
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meter.synchronize_between_processes()
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def add_meter(self, name, meter):
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self.meters[name] = meter
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def log_every(self, iterable, print_freq, header=None):
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i = 0
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if not header:
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header = ""
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start_time = time.time()
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end = time.time()
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iter_time = SmoothedValue(fmt="{avg:.4f}")
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data_time = SmoothedValue(fmt="{avg:.4f}")
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space_fmt = ":" + str(len(str(len(iterable)))) + "d"
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if torch.cuda.is_available():
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log_msg = self.delimiter.join(
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[
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header,
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"[{0" + space_fmt + "}/{1}]",
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"eta: {eta}",
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"{meters}",
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"time: {time}",
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"data: {data}",
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"max mem: {memory:.0f}",
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]
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)
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else:
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log_msg = self.delimiter.join(
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[header, "[{0" + space_fmt + "}/{1}]", "eta: {eta}",
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"{meters}", "time: {time}", "data: {data}"]
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)
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MB = 1024.0 * 1024.0
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for obj in iterable:
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data_time.update(time.time() - end)
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yield obj
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iter_time.update(time.time() - end)
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if i % print_freq == 0:
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eta_seconds = iter_time.global_avg * (len(iterable) - i)
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eta_string = str(datetime.timedelta(seconds=int(eta_seconds)))
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if torch.cuda.is_available():
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print(
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log_msg.format(
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i,
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len(iterable),
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eta=eta_string,
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meters=str(self),
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time=str(iter_time),
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data=str(data_time),
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memory=torch.cuda.max_memory_allocated() / MB,
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)
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)
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else:
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print(
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log_msg.format(
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i, len(iterable), eta=eta_string, meters=str(self), time=str(iter_time), data=str(data_time)
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)
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)
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i += 1
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end = time.time()
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total_time = time.time() - start_time
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total_time_str = str(datetime.timedelta(seconds=int(total_time)))
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print(f"{header} Total time: {total_time_str}")
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def cat_list(images, fill_value=0):
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max_size = tuple(max(s) for s in zip(*[img.shape for img in images]))
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batch_shape = (len(images),) + max_size
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batched_imgs = images[0].new(*batch_shape).fill_(fill_value)
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for img, pad_img in zip(images, batched_imgs):
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pad_img[..., : img.shape[-2], : img.shape[-1]].copy_(img)
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return batched_imgs
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def collate_fn(batch):
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images, targets = list(zip(*batch))
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batched_imgs = cat_list(images, fill_value=0)
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batched_targets = cat_list(targets, fill_value=255)
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return batched_imgs, batched_targets
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def mkdir(path):
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try:
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os.makedirs(path)
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except OSError as e:
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if e.errno != errno.EEXIST:
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raise
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def setup_for_distributed(is_master):
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"""
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This function disables printing when not in master process
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"""
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import builtins as __builtin__
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builtin_print = __builtin__.print
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def print(*args, **kwargs):
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force = kwargs.pop("force", False)
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if is_master or force:
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builtin_print(*args, **kwargs)
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__builtin__.print = print
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def is_dist_avail_and_initialized():
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if not dist.is_available():
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return False
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if not dist.is_initialized():
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return False
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return True
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def get_world_size():
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if not is_dist_avail_and_initialized():
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return 1
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return dist.get_world_size()
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def get_rank():
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if not is_dist_avail_and_initialized():
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return 0
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return dist.get_rank()
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def is_main_process():
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return get_rank() == 0
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def save_on_master(*args, **kwargs):
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if is_main_process():
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torch.save(*args, **kwargs)
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def init_distributed_mode(args):
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if "RANK" in os.environ and "WORLD_SIZE" in os.environ:
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args.rank = int(os.environ["RANK"])
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args.world_size = int(os.environ["WORLD_SIZE"])
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args.gpu = int(os.environ["LOCAL_RANK"])
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# elif "SLURM_PROCID" in os.environ:
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# args.rank = int(os.environ["SLURM_PROCID"])
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# args.gpu = args.rank % torch.cuda.device_count()
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elif hasattr(args, "rank"):
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pass
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else:
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print("Not using distributed mode")
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args.distributed = False
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return
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args.distributed = True
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torch.cuda.set_device(args.gpu)
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args.dist_backend = "nccl"
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print(
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f"| distributed init (rank {args.rank}): {args.dist_url}", flush=True)
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torch.distributed.init_process_group(
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backend=args.dist_backend, init_method=args.dist_url, world_size=args.world_size, rank=args.rank
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)
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torch.distributed.barrier()
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setup_for_distributed(args.rank == 0)
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def reduce_across_processes(val):
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if not is_dist_avail_and_initialized():
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# nothing to sync, but we still convert to tensor for consistency with the distributed case.
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return torch.tensor(val)
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t = torch.tensor(val, device="cuda")
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dist.barrier()
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dist.all_reduce(t)
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return t
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def create_lr_scheduler(optimizer,
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num_step: int,
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epochs: int,
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warmup=True,
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warmup_epochs=1,
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warmup_factor=1e-3):
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assert num_step > 0 and epochs > 0
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if warmup is False:
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warmup_epochs = 0
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def f(x):
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"""
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根据step数返回一个学习率倍率因子，
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注意在训练开始之前，pytorch会提前调用一次lr_scheduler.step()方法
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"""
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if warmup is True and x <= (warmup_epochs * num_step):
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alpha = float(x) / (warmup_epochs * num_step)
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# warmup过程中lr倍率因子从warmup_factor -> 1
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return warmup_factor * (1 - alpha) + alpha
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else:
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# warmup后lr倍率因子从1 -> 0
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# 参考deeplab_v2: Learning rate policy
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return (1 - (x - warmup_epochs * num_step) / ((epochs - warmup_epochs) * num_step)) ** 0.9
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return torch.optim.lr_scheduler.LambdaLR(optimizer, lr_lambda=f) |