Refactor NUM_THREADS (#5954)

utils/datasets.py

@@ -26,8 +26,8 @@ from torch.utils.data import DataLoader, Dataset, dataloader, distributed
 from tqdm import tqdm
 
 from utils.augmentations import Albumentations, augment_hsv, copy_paste, letterbox, mixup, random_perspective
-from utils.general import (LOGGER, check_dataset, check_requirements, check_yaml, clean_str, segments2boxes, xyn2xy,
-                           xywh2xyxy, xywhn2xyxy, xyxy2xywhn)
+from utils.general import (LOGGER, NUM_THREADS, check_dataset, check_requirements, check_yaml, clean_str,
+                           segments2boxes, xyn2xy, xywh2xyxy, xywhn2xyxy, xyxy2xywhn)
 from utils.torch_utils import torch_distributed_zero_first
 
 # Parameters
@@ -35,7 +35,6 @@ HELP_URL = 'https://github.com/ultralytics/yolov5/wiki/Train-Custom-Data'
 IMG_FORMATS = ['bmp', 'jpg', 'jpeg', 'png', 'tif', 'tiff', 'dng', 'webp', 'mpo']  # acceptable image suffixes
 VID_FORMATS = ['mov', 'avi', 'mp4', 'mpg', 'mpeg', 'm4v', 'wmv', 'mkv']  # acceptable video suffixes
 WORLD_SIZE = int(os.getenv('WORLD_SIZE', 1))  # DPP
-NUM_THREADS = min(8, max(1, os.cpu_count() - 1))  # number of multiprocessing threads
 
 # Get orientation exif tag
 for orientation in ExifTags.TAGS.keys():