import datetime import errno import os import time from collections import defaultdict, deque import torch import torch.distributed as dist from utils.logging import log class SmoothedValue: """Track a series of values and provide access to smoothed values over a window or the global series average. """ def __init__(self, window_size=20, fmt=None): if fmt is None: fmt = "{median:.4f} ({global_avg:.4f})" self.deque = deque(maxlen=window_size) self.total = 0.0 self.count = 0 self.fmt = fmt def update(self, value, n=1): self.deque.append(value) self.count += n self.total += value * n def synchronize_between_processes(self): """ Warning: does not synchronize the deque! """ if not is_dist_avail_and_initialized(): return t = torch.tensor([self.count, self.total], dtype=torch.float64, device="cuda") dist.barrier() dist.all_reduce(t) t = t.tolist() self.count = int(t[0]) self.total = t[1] @property def median(self): d = torch.tensor(list(self.deque)) return d.median().item() @property def avg(self): d = torch.tensor(list(self.deque), dtype=torch.float32) return d.mean().item() @property def global_avg(self): return self.total / self.count @property def max(self): return max(self.deque) @property def value(self): return self.deque[-1] def __str__(self): return self.fmt.format( median=self.median, avg=self.avg, global_avg=self.global_avg, max=self.max, value=self.value ) def all_gather(data): """ Run all_gather on arbitrary picklable data (not necessarily tensors) Args: data: any picklable object Returns: list[data]: list of data gathered from each rank """ world_size = get_world_size() if world_size == 1: return [data] data_list = [None] * world_size dist.all_gather_object(data_list, data) return data_list def reduce_dict(input_dict, average=True): """ Args: input_dict (dict): all the values will be reduced average (bool): whether to do average or sum Reduce the values in the dictionary from all processes so that all processes have the averaged results. Returns a dict with the same fields as input_dict, after reduction. """ world_size = get_world_size() if world_size < 2: return input_dict with torch.inference_mode(): names = [] values = [] # sort the keys so that they are consistent across processes for k in sorted(input_dict.keys()): names.append(k) values.append(input_dict[k]) values = torch.stack(values, dim=0) dist.all_reduce(values) if average: values /= world_size reduced_dict = {k: v for k, v in zip(names, values)} return reduced_dict class MetricLogger: def __init__(self, delimiter="\t"): self.meters = defaultdict(SmoothedValue) self.delimiter = delimiter def update(self, **kwargs): for k, v in kwargs.items(): if isinstance(v, torch.Tensor): v = v.item() assert isinstance(v, (float, int)) self.meters[k].update(v) def __getattr__(self, attr): if attr in self.meters: return self.meters[attr] if attr in self.__dict__: return self.__dict__[attr] raise AttributeError(f"'{type(self).__name__}' object has no attribute '{attr}'") def __str__(self): loss_str = [] for name, meter in self.meters.items(): loss_str.append(f"{name}: {str(meter)}") return self.delimiter.join(loss_str) def synchronize_between_processes(self): for meter in self.meters.values(): meter.synchronize_between_processes() def add_meter(self, name, meter): self.meters[name] = meter def log_every(self, iterable, print_freq, header=None): i = 0 if not header: header = "" start_time = time.time() end = time.time() iter_time = SmoothedValue(fmt="{avg:.4f}") data_time = SmoothedValue(fmt="{avg:.4f}") space_fmt = ":" + str(len(str(len(iterable)))) + "d" if torch.cuda.is_available(): log_msg = self.delimiter.join( [ header, "[{0" + space_fmt + "}/{1}]", "eta: {eta}", "{meters}", "time: {time}", "data: {data}", "max mem: {memory:.0f}", ] ) else: log_msg = self.delimiter.join( [header, "[{0" + space_fmt + "}/{1}]", "eta: {eta}", "{meters}", "time: {time}", "data: {data}"] ) MB = 1024.0 * 1024.0 for obj in iterable: data_time.update(time.time() - end) yield obj iter_time.update(time.time() - end) if i % print_freq == 0 or i == len(iterable) - 1: eta_seconds = iter_time.global_avg * (len(iterable) - i) eta_string = str(datetime.timedelta(seconds=int(eta_seconds))) if torch.cuda.is_available(): log( log_msg.format( i, len(iterable), eta=eta_string, meters=str(self), time=str(iter_time), data=str(data_time), memory=torch.cuda.max_memory_allocated() / MB, ) ) else: log( log_msg.format( i, len(iterable), eta=eta_string, meters=str(self), time=str(iter_time), data=str(data_time) ) ) i += 1 end = time.time() total_time = time.time() - start_time total_time_str = str(datetime.timedelta(seconds=int(total_time))) log(f"{header} Total time: {total_time_str} ({total_time / len(iterable):.4f} s / it)") def collate_fn(batch): return tuple(zip(*batch)) def mkdir(path): try: os.makedirs(path) except OSError as e: if e.errno != errno.EEXIST: raise def setup_for_distributed(is_master): """ This function disables printing when not in master process """ import builtins as __builtin__ builtin_print = __builtin__.print def print(*args, **kwargs): force = kwargs.pop("force", False) if is_master or force: builtin_print(*args, **kwargs) __builtin__.print = print def is_dist_avail_and_initialized(): if not dist.is_available(): return False if not dist.is_initialized(): return False return True def get_world_size(): if not is_dist_avail_and_initialized(): return 1 return dist.get_world_size() def get_rank(): if not is_dist_avail_and_initialized(): return 0 return dist.get_rank() def is_main_process(): return get_rank() == 0 def save_on_master(*args, **kwargs): if is_main_process(): torch.save(*args, **kwargs) def init_distributed_mode(args): if "RANK" in os.environ and "WORLD_SIZE" in os.environ: args.rank = int(os.environ["RANK"]) args.world_size = int(os.environ["WORLD_SIZE"]) args.gpu = int(os.environ["LOCAL_RANK"]) elif "SLURM_PROCID" in os.environ: args.rank = int(os.environ["SLURM_PROCID"]) args.gpu = args.rank % torch.cuda.device_count() else: print("Not using distributed mode") args.distributed = False return args.distributed = True torch.cuda.set_device(args.gpu) args.dist_backend = "nccl" print(f"| distributed init (rank {args.rank}): {args.dist_url}", flush=True) torch.distributed.init_process_group( backend=args.dist_backend, init_method=args.dist_url, world_size=args.world_size, rank=args.rank ) torch.distributed.barrier() setup_for_distributed(args.rank == 0)