# Dataset utils and dataloaders import glob import logging import math import os import random import shutil import time from itertools import repeat from multiprocessing.pool import ThreadPool from pathlib import Path from threading import Thread import cv2 import numpy as np import torch import torch.nn.functional as F from PIL import Image, ExifTags from torch.utils.data import Dataset from tqdm import tqdm from utils.general import xyxy2xywh, xywh2xyxy, xywhn2xyxy, clean_str from utils.torch_utils import torch_distributed_zero_first # Parameters help_url = 'https://github.com/ultralytics/yolov5/wiki/Train-Custom-Data' img_formats = ['bmp', 'jpg', 'jpeg', 'png', 'tif', 'tiff', 'dng'] # acceptable image suffixes vid_formats = ['mov', 'avi', 'mp4', 'mpg', 'mpeg', 'm4v', 'wmv', 'mkv'] # acceptable video suffixes logger = logging.getLogger(__name__) # Get orientation exif tag for orientation in ExifTags.TAGS.keys(): if ExifTags.TAGS[orientation] == 'Orientation': break def get_hash(files): # Returns a single hash value of a list of files return sum(os.path.getsize(f) for f in files if os.path.isfile(f)) def exif_size(img): # Returns exif-corrected PIL size s = img.size # (width, height) try: rotation = dict(img._getexif().items())[orientation] if rotation == 6: # rotation 270 s = (s[1], s[0]) elif rotation == 8: # rotation 90 s = (s[1], s[0]) except: pass return s def create_dataloader(path, imgsz, batch_size, stride, opt, hyp=None, augment=False, cache=False, pad=0.0, rect=False, rank=-1, world_size=1, workers=8, image_weights=False, quad=False, prefix=''): # Make sure only the first process in DDP process the dataset first, and the following others can use the cache with torch_distributed_zero_first(rank): dataset = LoadImagesAndLabels(path, imgsz, batch_size, augment=augment, # augment images hyp=hyp, # augmentation hyperparameters rect=rect, # rectangular training cache_images=cache, single_cls=opt.single_cls, stride=int(stride), pad=pad, image_weights=image_weights, prefix=prefix) batch_size = min(batch_size, len(dataset)) nw = min([os.cpu_count() // world_size, batch_size if batch_size > 1 else 0, workers]) # number of workers sampler = torch.utils.data.distributed.DistributedSampler(dataset) if rank != -1 else None loader = torch.utils.data.DataLoader if image_weights else InfiniteDataLoader # Use torch.utils.data.DataLoader() if dataset.properties will update during training else InfiniteDataLoader() dataloader = loader(dataset, batch_size=batch_size, num_workers=nw, sampler=sampler, pin_memory=True, collate_fn=LoadImagesAndLabels.collate_fn4 if quad else LoadImagesAndLabels.collate_fn) return dataloader, dataset class InfiniteDataLoader(torch.utils.data.dataloader.DataLoader): """ Dataloader that reuses workers Uses same syntax as vanilla DataLoader """ def __init__(self, *args, **kwargs): super().__init__(*args, **kwargs) object.__setattr__(self, 'batch_sampler', _RepeatSampler(self.batch_sampler)) self.iterator = super().__iter__() def __len__(self): return len(self.batch_sampler.sampler) def __iter__(self): for i in range(len(self)): yield next(self.iterator) class _RepeatSampler(object): """ Sampler that repeats forever Args: sampler (Sampler) """ def __init__(self, sampler): self.sampler = sampler def __iter__(self): while True: yield from iter(self.sampler) class LoadImages: # for inference def __init__(self, path, img_size=640): p = str(Path(path)) # os-agnostic p = os.path.abspath(p) # absolute path if '*' in p: files = sorted(glob.glob(p, recursive=True)) # glob elif os.path.isdir(p): files = sorted(glob.glob(os.path.join(p, '*.*'))) # dir elif os.path.isfile(p): files = [p] # files else: raise Exception(f'ERROR: {p} does not exist') images = [x for x in files if x.split('.')[-1].lower() in img_formats] videos = [x for x in files if x.split('.')[-1].lower() in vid_formats] ni, nv = len(images), len(videos) self.img_size = img_size self.files = images + videos self.nf = ni + nv # number of files self.video_flag = [False] * ni + [True] * nv self.mode = 'image' if any(videos): self.new_video(videos[0]) # new video else: self.cap = None assert self.nf > 0, f'No images or videos found in {p}. ' \ f'Supported formats are:\nimages: {img_formats}\nvideos: {vid_formats}' def __iter__(self): self.count = 0 return self def __next__(self): if self.count == self.nf: raise StopIteration path = self.files[self.count] if self.video_flag[self.count]: # Read video self.mode = 'video' ret_val, img0 = self.cap.read() if not ret_val: self.count += 1 self.cap.release() if self.count == self.nf: # last video raise StopIteration else: path = self.files[self.count] self.new_video(path) ret_val, img0 = self.cap.read() self.frame += 1 print(f'video {self.count + 1}/{self.nf} ({self.frame}/{self.nframes}) {path}: ', end='') else: # Read image self.count += 1 img0 = cv2.imread(path) # BGR assert img0 is not None, 'Image Not Found ' + path print(f'image {self.count}/{self.nf} {path}: ', end='') # Padded resize img = letterbox(img0, new_shape=self.img_size)[0] # Convert img = img[:, :, ::-1].transpose(2, 0, 1) # BGR to RGB, to 3x416x416 img = np.ascontiguousarray(img) return path, img, img0, self.cap def new_video(self, path): self.frame = 0 self.cap = cv2.VideoCapture(path) self.nframes = int(self.cap.get(cv2.CAP_PROP_FRAME_COUNT)) def __len__(self): return self.nf # number of files class LoadWebcam: # for inference def __init__(self, pipe='0', img_size=640): self.img_size = img_size if pipe.isnumeric(): pipe = eval(pipe) # local camera # pipe = 'rtsp://192.168.1.64/1' # IP camera # pipe = 'rtsp://username:password@192.168.1.64/1' # IP camera with login # pipe = 'http://wmccpinetop.axiscam.net/mjpg/video.mjpg' # IP golf camera self.pipe = pipe self.cap = cv2.VideoCapture(pipe) # video capture object self.cap.set(cv2.CAP_PROP_BUFFERSIZE, 3) # set buffer size def __iter__(self): self.count = -1 return self def __next__(self): self.count += 1 if cv2.waitKey(1) == ord('q'): # q to quit self.cap.release() cv2.destroyAllWindows() raise StopIteration # Read frame if self.pipe == 0: # local camera ret_val, img0 = self.cap.read() img0 = cv2.flip(img0, 1) # flip left-right else: # IP camera n = 0 while True: n += 1 self.cap.grab() if n % 30 == 0: # skip frames ret_val, img0 = self.cap.retrieve() if ret_val: break # Print assert ret_val, f'Camera Error {self.pipe}' img_path = 'webcam.jpg' print(f'webcam {self.count}: ', end='') # Padded resize img = letterbox(img0, new_shape=self.img_size)[0] # Convert img = img[:, :, ::-1].transpose(2, 0, 1) # BGR to RGB, to 3x416x416 img = np.ascontiguousarray(img) return img_path, img, img0, None def __len__(self): return 0 class LoadStreams: # multiple IP or RTSP cameras def __init__(self, sources='streams.txt', img_size=640): self.mode = 'stream' self.img_size = img_size if os.path.isfile(sources): with open(sources, 'r') as f: sources = [x.strip() for x in f.read().strip().splitlines() if len(x.strip())] else: sources = [sources] n = len(sources) self.imgs = [None] * n self.sources = [clean_str(x) for x in sources] # clean source names for later for i, s in enumerate(sources): # Start the thread to read frames from the video stream print(f'{i + 1}/{n}: {s}... ', end='') cap = cv2.VideoCapture(eval(s) if s.isnumeric() else s) assert cap.isOpened(), f'Failed to open {s}' w = int(cap.get(cv2.CAP_PROP_FRAME_WIDTH)) h = int(cap.get(cv2.CAP_PROP_FRAME_HEIGHT)) fps = cap.get(cv2.CAP_PROP_FPS) % 100 _, self.imgs[i] = cap.read() # guarantee first frame thread = Thread(target=self.update, args=([i, cap]), daemon=True) print(f' success ({w}x{h} at {fps:.2f} FPS).') thread.start() print('') # newline # check for common shapes s = np.stack([letterbox(x, new_shape=self.img_size)[0].shape for x in self.imgs], 0) # inference shapes self.rect = np.unique(s, axis=0).shape[0] == 1 # rect inference if all shapes equal if not self.rect: print('WARNING: Different stream shapes detected. For optimal performance supply similarly-shaped streams.') def update(self, index, cap): # Read next stream frame in a daemon thread n = 0 while cap.isOpened(): n += 1 # _, self.imgs[index] = cap.read() cap.grab() if n == 4: # read every 4th frame _, self.imgs[index] = cap.retrieve() n = 0 time.sleep(0.01) # wait time def __iter__(self): self.count = -1 return self def __next__(self): self.count += 1 img0 = self.imgs.copy() if cv2.waitKey(1) == ord('q'): # q to quit cv2.destroyAllWindows() raise StopIteration # Letterbox img = [letterbox(x, new_shape=self.img_size, auto=self.rect)[0] for x in img0] # Stack img = np.stack(img, 0) # Convert img = img[:, :, :, ::-1].transpose(0, 3, 1, 2) # BGR to RGB, to bsx3x416x416 img = np.ascontiguousarray(img) return self.sources, img, img0, None def __len__(self): return 0 # 1E12 frames = 32 streams at 30 FPS for 30 years def img2label_paths(img_paths): # Define label paths as a function of image paths sa, sb = os.sep + 'images' + os.sep, os.sep + 'labels' + os.sep # /images/, /labels/ substrings return [x.replace(sa, sb, 1).replace('.' + x.split('.')[-1], '.txt') for x in img_paths] class LoadImagesAndLabels(Dataset): # for training/testing def __init__(self, path, img_size=640, batch_size=16, augment=False, hyp=None, rect=False, image_weights=False, cache_images=False, single_cls=False, stride=32, pad=0.0, prefix=''): self.img_size = img_size self.augment = augment self.hyp = hyp self.image_weights = image_weights self.rect = False if image_weights else rect self.mosaic = self.augment and not self.rect # load 4 images at a time into a mosaic (only during training) self.mosaic_border = [-img_size // 2, -img_size // 2] self.stride = stride try: f = [] # image files for p in path if isinstance(path, list) else [path]: p = Path(p) # os-agnostic if p.is_dir(): # dir f += glob.glob(str(p / '**' / '*.*'), recursive=True) elif p.is_file(): # file with open(p, 'r') as t: t = t.read().strip().splitlines() parent = str(p.parent) + os.sep f += [x.replace('./', parent) if x.startswith('./') else x for x in t] # local to global path else: raise Exception(f'{prefix}{p} does not exist') self.img_files = sorted([x.replace('/', os.sep) for x in f if x.split('.')[-1].lower() in img_formats]) assert self.img_files, f'{prefix}No images found' except Exception as e: raise Exception(f'{prefix}Error loading data from {path}: {e}\nSee {help_url}') # Check cache self.label_files = img2label_paths(self.img_files) # labels cache_path = Path(self.label_files[0]).parent.with_suffix('.cache') # cached labels if cache_path.is_file(): cache = torch.load(cache_path) # load if cache['hash'] != get_hash(self.label_files + self.img_files) or 'results' not in cache: # changed cache = self.cache_labels(cache_path, prefix) # re-cache else: cache = self.cache_labels(cache_path, prefix) # cache # Display cache [nf, nm, ne, nc, n] = cache.pop('results') # found, missing, empty, corrupted, total desc = f"Scanning '{cache_path}' for images and labels... {nf} found, {nm} missing, {ne} empty, {nc} corrupted" tqdm(None, desc=prefix + desc, total=n, initial=n) assert nf > 0 or not augment, f'{prefix}No labels in {cache_path}. Can not train without labels. See {help_url}' # Read cache cache.pop('hash') # remove hash labels, shapes = zip(*cache.values()) self.labels = list(labels) self.shapes = np.array(shapes, dtype=np.float64) self.img_files = list(cache.keys()) # update self.label_files = img2label_paths(cache.keys()) # update if single_cls: for x in self.labels: x[:, 0] = 0 n = len(shapes) # number of images bi = np.floor(np.arange(n) / batch_size).astype(np.int) # batch index nb = bi[-1] + 1 # number of batches self.batch = bi # batch index of image self.n = n self.indices = range(n) # Rectangular Training if self.rect: # Sort by aspect ratio s = self.shapes # wh ar = s[:, 1] / s[:, 0] # aspect ratio irect = ar.argsort() self.img_files = [self.img_files[i] for i in irect] self.label_files = [self.label_files[i] for i in irect] self.labels = [self.labels[i] for i in irect] self.shapes = s[irect] # wh ar = ar[irect] # Set training image shapes shapes = [[1, 1]] * nb for i in range(nb): ari = ar[bi == i] mini, maxi = ari.min(), ari.max() if maxi < 1: shapes[i] = [maxi, 1] elif mini > 1: shapes[i] = [1, 1 / mini] self.batch_shapes = np.ceil(np.array(shapes) * img_size / stride + pad).astype(np.int) * stride # Cache images into memory for faster training (WARNING: large datasets may exceed system RAM) self.imgs = [None] * n if cache_images: gb = 0 # Gigabytes of cached images self.img_hw0, self.img_hw = [None] * n, [None] * n results = ThreadPool(8).imap(lambda x: load_image(*x), zip(repeat(self), range(n))) # 8 threads pbar = tqdm(enumerate(results), total=n) for i, x in pbar: self.imgs[i], self.img_hw0[i], self.img_hw[i] = x # img, hw_original, hw_resized = load_image(self, i) gb += self.imgs[i].nbytes pbar.desc = f'{prefix}Caching images ({gb / 1E9:.1f}GB)' def cache_labels(self, path=Path('./labels.cache'), prefix=''): # Cache dataset labels, check images and read shapes x = {} # dict nm, nf, ne, nc = 0, 0, 0, 0 # number missing, found, empty, duplicate pbar = tqdm(zip(self.img_files, self.label_files), desc='Scanning images', total=len(self.img_files)) for i, (im_file, lb_file) in enumerate(pbar): try: # verify images im = Image.open(im_file) im.verify() # PIL verify shape = exif_size(im) # image size assert (shape[0] > 9) & (shape[1] > 9), 'image size <10 pixels' # verify labels if os.path.isfile(lb_file): nf += 1 # label found with open(lb_file, 'r') as f: l = np.array([x.split() for x in f.read().strip().splitlines()], dtype=np.float32) # labels if len(l): assert l.shape[1] == 5, 'labels require 5 columns each' assert (l >= 0).all(), 'negative labels' assert (l[:, 1:] <= 1).all(), 'non-normalized or out of bounds coordinate labels' assert np.unique(l, axis=0).shape[0] == l.shape[0], 'duplicate labels' else: ne += 1 # label empty l = np.zeros((0, 5), dtype=np.float32) else: nm += 1 # label missing l = np.zeros((0, 5), dtype=np.float32) x[im_file] = [l, shape] except Exception as e: nc += 1 print(f'{prefix}WARNING: Ignoring corrupted image and/or label {im_file}: {e}') pbar.desc = f"{prefix}Scanning '{path.parent / path.stem}' for images and labels... " \ f"{nf} found, {nm} missing, {ne} empty, {nc} corrupted" if nf == 0: print(f'{prefix}WARNING: No labels found in {path}. See {help_url}') x['hash'] = get_hash(self.label_files + self.img_files) x['results'] = [nf, nm, ne, nc, i + 1] torch.save(x, path) # save for next time logging.info(f'{prefix}New cache created: {path}') return x def __len__(self): return len(self.img_files) # def __iter__(self): # self.count = -1 # print('ran dataset iter') # #self.shuffled_vector = np.random.permutation(self.nF) if self.augment else np.arange(self.nF) # return self def __getitem__(self, index): index = self.indices[index] # linear, shuffled, or image_weights hyp = self.hyp mosaic = self.mosaic and random.random() < hyp['mosaic'] if mosaic: # Load mosaic img, labels = load_mosaic(self, index) shapes = None # MixUp https://arxiv.org/pdf/1710.09412.pdf if random.random() < hyp['mixup']: img2, labels2 = load_mosaic(self, random.randint(0, self.n - 1)) r = np.random.beta(8.0, 8.0) # mixup ratio, alpha=beta=8.0 img = (img * r + img2 * (1 - r)).astype(np.uint8) labels = np.concatenate((labels, labels2), 0) else: # Load image img, (h0, w0), (h, w) = load_image(self, index) # Letterbox shape = self.batch_shapes[self.batch[index]] if self.rect else self.img_size # final letterboxed shape img, ratio, pad = letterbox(img, shape, auto=False, scaleup=self.augment) shapes = (h0, w0), ((h / h0, w / w0), pad) # for COCO mAP rescaling labels = self.labels[index].copy() if labels.size: # normalized xywh to pixel xyxy format labels[:, 1:] = xywhn2xyxy(labels[:, 1:], ratio[0] * w, ratio[1] * h, padw=pad[0], padh=pad[1]) if self.augment: # Augment imagespace if not mosaic: img, labels = random_perspective(img, labels, degrees=hyp['degrees'], translate=hyp['translate'], scale=hyp['scale'], shear=hyp['shear'], perspective=hyp['perspective']) # Augment colorspace augment_hsv(img, hgain=hyp['hsv_h'], sgain=hyp['hsv_s'], vgain=hyp['hsv_v']) # Apply cutouts # if random.random() < 0.9: # labels = cutout(img, labels) nL = len(labels) # number of labels if nL: labels[:, 1:5] = xyxy2xywh(labels[:, 1:5]) # convert xyxy to xywh labels[:, [2, 4]] /= img.shape[0] # normalized height 0-1 labels[:, [1, 3]] /= img.shape[1] # normalized width 0-1 if self.augment: # flip up-down if random.random() < hyp['flipud']: img = np.flipud(img) if nL: labels[:, 2] = 1 - labels[:, 2] # flip left-right if random.random() < hyp['fliplr']: img = np.fliplr(img) if nL: labels[:, 1] = 1 - labels[:, 1] labels_out = torch.zeros((nL, 6)) if nL: labels_out[:, 1:] = torch.from_numpy(labels) # Convert img = img[:, :, ::-1].transpose(2, 0, 1) # BGR to RGB, to 3x416x416 img = np.ascontiguousarray(img) return torch.from_numpy(img), labels_out, self.img_files[index], shapes @staticmethod def collate_fn(batch): img, label, path, shapes = zip(*batch) # transposed for i, l in enumerate(label): l[:, 0] = i # add target image index for build_targets() return torch.stack(img, 0), torch.cat(label, 0), path, shapes @staticmethod def collate_fn4(batch): img, label, path, shapes = zip(*batch) # transposed n = len(shapes) // 4 img4, label4, path4, shapes4 = [], [], path[:n], shapes[:n] ho = torch.tensor([[0., 0, 0, 1, 0, 0]]) wo = torch.tensor([[0., 0, 1, 0, 0, 0]]) s = torch.tensor([[1, 1, .5, .5, .5, .5]]) # scale for i in range(n): # zidane torch.zeros(16,3,720,1280) # BCHW i *= 4 if random.random() < 0.5: im = F.interpolate(img[i].unsqueeze(0).float(), scale_factor=2., mode='bilinear', align_corners=False)[ 0].type(img[i].type()) l = label[i] else: im = torch.cat((torch.cat((img[i], img[i + 1]), 1), torch.cat((img[i + 2], img[i + 3]), 1)), 2) l = torch.cat((label[i], label[i + 1] + ho, label[i + 2] + wo, label[i + 3] + ho + wo), 0) * s img4.append(im) label4.append(l) for i, l in enumerate(label4): l[:, 0] = i # add target image index for build_targets() return torch.stack(img4, 0), torch.cat(label4, 0), path4, shapes4 # Ancillary functions -------------------------------------------------------------------------------------------------- def load_image(self, index): # loads 1 image from dataset, returns img, original hw, resized hw img = self.imgs[index] if img is None: # not cached path = self.img_files[index] img = cv2.imread(path) # BGR assert img is not None, 'Image Not Found ' + path h0, w0 = img.shape[:2] # orig hw r = self.img_size / max(h0, w0) # resize image to img_size if r != 1: # always resize down, only resize up if training with augmentation interp = cv2.INTER_AREA if r < 1 and not self.augment else cv2.INTER_LINEAR img = cv2.resize(img, (int(w0 * r), int(h0 * r)), interpolation=interp) return img, (h0, w0), img.shape[:2] # img, hw_original, hw_resized else: return self.imgs[index], self.img_hw0[index], self.img_hw[index] # img, hw_original, hw_resized def augment_hsv(img, hgain=0.5, sgain=0.5, vgain=0.5): r = np.random.uniform(-1, 1, 3) * [hgain, sgain, vgain] + 1 # random gains hue, sat, val = cv2.split(cv2.cvtColor(img, cv2.COLOR_BGR2HSV)) dtype = img.dtype # uint8 x = np.arange(0, 256, dtype=np.int16) lut_hue = ((x * r[0]) % 180).astype(dtype) lut_sat = np.clip(x * r[1], 0, 255).astype(dtype) lut_val = np.clip(x * r[2], 0, 255).astype(dtype) img_hsv = cv2.merge((cv2.LUT(hue, lut_hue), cv2.LUT(sat, lut_sat), cv2.LUT(val, lut_val))).astype(dtype) cv2.cvtColor(img_hsv, cv2.COLOR_HSV2BGR, dst=img) # no return needed # Histogram equalization # if random.random() < 0.2: # for i in range(3): # img[:, :, i] = cv2.equalizeHist(img[:, :, i]) def load_mosaic(self, index): # loads images in a 4-mosaic labels4 = [] s = self.img_size yc, xc = [int(random.uniform(-x, 2 * s + x)) for x in self.mosaic_border] # mosaic center x, y indices = [index] + [self.indices[random.randint(0, self.n - 1)] for _ in range(3)] # 3 additional image indices for i, index in enumerate(indices): # Load image img, _, (h, w) = load_image(self, index) # place img in img4 if i == 0: # top left img4 = np.full((s * 2, s * 2, img.shape[2]), 114, dtype=np.uint8) # base image with 4 tiles x1a, y1a, x2a, y2a = max(xc - w, 0), max(yc - h, 0), xc, yc # xmin, ymin, xmax, ymax (large image) x1b, y1b, x2b, y2b = w - (x2a - x1a), h - (y2a - y1a), w, h # xmin, ymin, xmax, ymax (small image) elif i == 1: # top right x1a, y1a, x2a, y2a = xc, max(yc - h, 0), min(xc + w, s * 2), yc x1b, y1b, x2b, y2b = 0, h - (y2a - y1a), min(w, x2a - x1a), h elif i == 2: # bottom left x1a, y1a, x2a, y2a = max(xc - w, 0), yc, xc, min(s * 2, yc + h) x1b, y1b, x2b, y2b = w - (x2a - x1a), 0, w, min(y2a - y1a, h) elif i == 3: # bottom right x1a, y1a, x2a, y2a = xc, yc, min(xc + w, s * 2), min(s * 2, yc + h) x1b, y1b, x2b, y2b = 0, 0, min(w, x2a - x1a), min(y2a - y1a, h) img4[y1a:y2a, x1a:x2a] = img[y1b:y2b, x1b:x2b] # img4[ymin:ymax, xmin:xmax] padw = x1a - x1b padh = y1a - y1b # Labels labels = self.labels[index].copy() if labels.size: labels[:, 1:] = xywhn2xyxy(labels[:, 1:], w, h, padw, padh) # normalized xywh to pixel xyxy format labels4.append(labels) # Concat/clip labels if len(labels4): labels4 = np.concatenate(labels4, 0) np.clip(labels4[:, 1:], 0, 2 * s, out=labels4[:, 1:]) # use with random_perspective # img4, labels4 = replicate(img4, labels4) # replicate # Augment img4, labels4 = random_perspective(img4, labels4, degrees=self.hyp['degrees'], translate=self.hyp['translate'], scale=self.hyp['scale'], shear=self.hyp['shear'], perspective=self.hyp['perspective'], border=self.mosaic_border) # border to remove return img4, labels4 def load_mosaic9(self, index): # loads images in a 9-mosaic labels9 = [] s = self.img_size indices = [index] + [self.indices[random.randint(0, self.n - 1)] for _ in range(8)] # 8 additional image indices for i, index in enumerate(indices): # Load image img, _, (h, w) = load_image(self, index) # place img in img9 if i == 0: # center img9 = np.full((s * 3, s * 3, img.shape[2]), 114, dtype=np.uint8) # base image with 4 tiles h0, w0 = h, w c = s, s, s + w, s + h # xmin, ymin, xmax, ymax (base) coordinates elif i == 1: # top c = s, s - h, s + w, s elif i == 2: # top right c = s + wp, s - h, s + wp + w, s elif i == 3: # right c = s + w0, s, s + w0 + w, s + h elif i == 4: # bottom right c = s + w0, s + hp, s + w0 + w, s + hp + h elif i == 5: # bottom c = s + w0 - w, s + h0, s + w0, s + h0 + h elif i == 6: # bottom left c = s + w0 - wp - w, s + h0, s + w0 - wp, s + h0 + h elif i == 7: # left c = s - w, s + h0 - h, s, s + h0 elif i == 8: # top left c = s - w, s + h0 - hp - h, s, s + h0 - hp padx, pady = c[:2] x1, y1, x2, y2 = [max(x, 0) for x in c] # allocate coords # Labels labels = self.labels[index].copy() if labels.size: labels[:, 1:] = xywhn2xyxy(labels[:, 1:], w, h, padx, pady) # normalized xywh to pixel xyxy format labels9.append(labels) # Image img9[y1:y2, x1:x2] = img[y1 - pady:, x1 - padx:] # img9[ymin:ymax, xmin:xmax] hp, wp = h, w # height, width previous # Offset yc, xc = [int(random.uniform(0, s)) for x in self.mosaic_border] # mosaic center x, y img9 = img9[yc:yc + 2 * s, xc:xc + 2 * s] # Concat/clip labels if len(labels9): labels9 = np.concatenate(labels9, 0) labels9[:, [1, 3]] -= xc labels9[:, [2, 4]] -= yc np.clip(labels9[:, 1:], 0, 2 * s, out=labels9[:, 1:]) # use with random_perspective # img9, labels9 = replicate(img9, labels9) # replicate # Augment img9, labels9 = random_perspective(img9, labels9, degrees=self.hyp['degrees'], translate=self.hyp['translate'], scale=self.hyp['scale'], shear=self.hyp['shear'], perspective=self.hyp['perspective'], border=self.mosaic_border) # border to remove return img9, labels9 def replicate(img, labels): # Replicate labels h, w = img.shape[:2] boxes = labels[:, 1:].astype(int) x1, y1, x2, y2 = boxes.T s = ((x2 - x1) + (y2 - y1)) / 2 # side length (pixels) for i in s.argsort()[:round(s.size * 0.5)]: # smallest indices x1b, y1b, x2b, y2b = boxes[i] bh, bw = y2b - y1b, x2b - x1b yc, xc = int(random.uniform(0, h - bh)), int(random.uniform(0, w - bw)) # offset x, y x1a, y1a, x2a, y2a = [xc, yc, xc + bw, yc + bh] img[y1a:y2a, x1a:x2a] = img[y1b:y2b, x1b:x2b] # img4[ymin:ymax, xmin:xmax] labels = np.append(labels, [[labels[i, 0], x1a, y1a, x2a, y2a]], axis=0) return img, labels def letterbox(img, new_shape=(640, 640), color=(114, 114, 114), auto=True, scaleFill=False, scaleup=True): # Resize image to a 32-pixel-multiple rectangle https://github.com/ultralytics/yolov3/issues/232 shape = img.shape[:2] # current shape [height, width] if isinstance(new_shape, int): new_shape = (new_shape, new_shape) # Scale ratio (new / old) r = min(new_shape[0] / shape[0], new_shape[1] / shape[1]) if not scaleup: # only scale down, do not scale up (for better test mAP) r = min(r, 1.0) # Compute padding ratio = r, r # width, height ratios new_unpad = int(round(shape[1] * r)), int(round(shape[0] * r)) dw, dh = new_shape[1] - new_unpad[0], new_shape[0] - new_unpad[1] # wh padding if auto: # minimum rectangle dw, dh = np.mod(dw, 32), np.mod(dh, 32) # wh padding elif scaleFill: # stretch dw, dh = 0.0, 0.0 new_unpad = (new_shape[1], new_shape[0]) ratio = new_shape[1] / shape[1], new_shape[0] / shape[0] # width, height ratios dw /= 2 # divide padding into 2 sides dh /= 2 if shape[::-1] != new_unpad: # resize img = cv2.resize(img, new_unpad, interpolation=cv2.INTER_LINEAR) top, bottom = int(round(dh - 0.1)), int(round(dh + 0.1)) left, right = int(round(dw - 0.1)), int(round(dw + 0.1)) img = cv2.copyMakeBorder(img, top, bottom, left, right, cv2.BORDER_CONSTANT, value=color) # add border return img, ratio, (dw, dh) def random_perspective(img, targets=(), degrees=10, translate=.1, scale=.1, shear=10, perspective=0.0, border=(0, 0)): # torchvision.transforms.RandomAffine(degrees=(-10, 10), translate=(.1, .1), scale=(.9, 1.1), shear=(-10, 10)) # targets = [cls, xyxy] height = img.shape[0] + border[0] * 2 # shape(h,w,c) width = img.shape[1] + border[1] * 2 # Center C = np.eye(3) C[0, 2] = -img.shape[1] / 2 # x translation (pixels) C[1, 2] = -img.shape[0] / 2 # y translation (pixels) # Perspective P = np.eye(3) P[2, 0] = random.uniform(-perspective, perspective) # x perspective (about y) P[2, 1] = random.uniform(-perspective, perspective) # y perspective (about x) # Rotation and Scale R = np.eye(3) a = random.uniform(-degrees, degrees) # a += random.choice([-180, -90, 0, 90]) # add 90deg rotations to small rotations s = random.uniform(1 - scale, 1 + scale) # s = 2 ** random.uniform(-scale, scale) R[:2] = cv2.getRotationMatrix2D(angle=a, center=(0, 0), scale=s) # Shear S = np.eye(3) S[0, 1] = math.tan(random.uniform(-shear, shear) * math.pi / 180) # x shear (deg) S[1, 0] = math.tan(random.uniform(-shear, shear) * math.pi / 180) # y shear (deg) # Translation T = np.eye(3) T[0, 2] = random.uniform(0.5 - translate, 0.5 + translate) * width # x translation (pixels) T[1, 2] = random.uniform(0.5 - translate, 0.5 + translate) * height # y translation (pixels) # Combined rotation matrix M = T @ S @ R @ P @ C # order of operations (right to left) is IMPORTANT if (border[0] != 0) or (border[1] != 0) or (M != np.eye(3)).any(): # image changed if perspective: img = cv2.warpPerspective(img, M, dsize=(width, height), borderValue=(114, 114, 114)) else: # affine img = cv2.warpAffine(img, M[:2], dsize=(width, height), borderValue=(114, 114, 114)) # Visualize # import matplotlib.pyplot as plt # ax = plt.subplots(1, 2, figsize=(12, 6))[1].ravel() # ax[0].imshow(img[:, :, ::-1]) # base # ax[1].imshow(img2[:, :, ::-1]) # warped # Transform label coordinates n = len(targets) if n: # warp points xy = np.ones((n * 4, 3)) xy[:, :2] = targets[:, [1, 2, 3, 4, 1, 4, 3, 2]].reshape(n * 4, 2) # x1y1, x2y2, x1y2, x2y1 xy = xy @ M.T # transform if perspective: xy = (xy[:, :2] / xy[:, 2:3]).reshape(n, 8) # rescale else: # affine xy = xy[:, :2].reshape(n, 8) # create new boxes x = xy[:, [0, 2, 4, 6]] y = xy[:, [1, 3, 5, 7]] xy = np.concatenate((x.min(1), y.min(1), x.max(1), y.max(1))).reshape(4, n).T # # apply angle-based reduction of bounding boxes # radians = a * math.pi / 180 # reduction = max(abs(math.sin(radians)), abs(math.cos(radians))) ** 0.5 # x = (xy[:, 2] + xy[:, 0]) / 2 # y = (xy[:, 3] + xy[:, 1]) / 2 # w = (xy[:, 2] - xy[:, 0]) * reduction # h = (xy[:, 3] - xy[:, 1]) * reduction # xy = np.concatenate((x - w / 2, y - h / 2, x + w / 2, y + h / 2)).reshape(4, n).T # clip boxes xy[:, [0, 2]] = xy[:, [0, 2]].clip(0, width) xy[:, [1, 3]] = xy[:, [1, 3]].clip(0, height) # filter candidates i = box_candidates(box1=targets[:, 1:5].T * s, box2=xy.T) targets = targets[i] targets[:, 1:5] = xy[i] return img, targets def box_candidates(box1, box2, wh_thr=2, ar_thr=20, area_thr=0.1, eps=1e-16): # box1(4,n), box2(4,n) # Compute candidate boxes: box1 before augment, box2 after augment, wh_thr (pixels), aspect_ratio_thr, area_ratio w1, h1 = box1[2] - box1[0], box1[3] - box1[1] w2, h2 = box2[2] - box2[0], box2[3] - box2[1] ar = np.maximum(w2 / (h2 + eps), h2 / (w2 + eps)) # aspect ratio return (w2 > wh_thr) & (h2 > wh_thr) & (w2 * h2 / (w1 * h1 + eps) > area_thr) & (ar < ar_thr) # candidates def cutout(image, labels): # Applies image cutout augmentation https://arxiv.org/abs/1708.04552 h, w = image.shape[:2] def bbox_ioa(box1, box2): # Returns the intersection over box2 area given box1, box2. box1 is 4, box2 is nx4. boxes are x1y1x2y2 box2 = box2.transpose() # Get the coordinates of bounding boxes b1_x1, b1_y1, b1_x2, b1_y2 = box1[0], box1[1], box1[2], box1[3] b2_x1, b2_y1, b2_x2, b2_y2 = box2[0], box2[1], box2[2], box2[3] # Intersection area inter_area = (np.minimum(b1_x2, b2_x2) - np.maximum(b1_x1, b2_x1)).clip(0) * \ (np.minimum(b1_y2, b2_y2) - np.maximum(b1_y1, b2_y1)).clip(0) # box2 area box2_area = (b2_x2 - b2_x1) * (b2_y2 - b2_y1) + 1e-16 # Intersection over box2 area return inter_area / box2_area # create random masks scales = [0.5] * 1 + [0.25] * 2 + [0.125] * 4 + [0.0625] * 8 + [0.03125] * 16 # image size fraction for s in scales: mask_h = random.randint(1, int(h * s)) mask_w = random.randint(1, int(w * s)) # box xmin = max(0, random.randint(0, w) - mask_w // 2) ymin = max(0, random.randint(0, h) - mask_h // 2) xmax = min(w, xmin + mask_w) ymax = min(h, ymin + mask_h) # apply random color mask image[ymin:ymax, xmin:xmax] = [random.randint(64, 191) for _ in range(3)] # return unobscured labels if len(labels) and s > 0.03: box = np.array([xmin, ymin, xmax, ymax], dtype=np.float32) ioa = bbox_ioa(box, labels[:, 1:5]) # intersection over area labels = labels[ioa < 0.60] # remove >60% obscured labels return labels def create_folder(path='./new'): # Create folder if os.path.exists(path): shutil.rmtree(path) # delete output folder os.makedirs(path) # make new output folder def flatten_recursive(path='../coco128'): # Flatten a recursive directory by bringing all files to top level new_path = Path(path + '_flat') create_folder(new_path) for file in tqdm(glob.glob(str(Path(path)) + '/**/*.*', recursive=True)): shutil.copyfile(file, new_path / Path(file).name) def extract_boxes(path='../coco128/'): # from utils.datasets import *; extract_boxes('../coco128') # Convert detection dataset into classification dataset, with one directory per class path = Path(path) # images dir shutil.rmtree(path / 'classifier') if (path / 'classifier').is_dir() else None # remove existing files = list(path.rglob('*.*')) n = len(files) # number of files for im_file in tqdm(files, total=n): if im_file.suffix[1:] in img_formats: # image im = cv2.imread(str(im_file))[..., ::-1] # BGR to RGB h, w = im.shape[:2] # labels lb_file = Path(img2label_paths([str(im_file)])[0]) if Path(lb_file).exists(): with open(lb_file, 'r') as f: lb = np.array([x.split() for x in f.read().strip().splitlines()], dtype=np.float32) # labels for j, x in enumerate(lb): c = int(x[0]) # class f = (path / 'classifier') / f'{c}' / f'{path.stem}_{im_file.stem}_{j}.jpg' # new filename if not f.parent.is_dir(): f.parent.mkdir(parents=True) b = x[1:] * [w, h, w, h] # box # b[2:] = b[2:].max() # rectangle to square b[2:] = b[2:] * 1.2 + 3 # pad b = xywh2xyxy(b.reshape(-1, 4)).ravel().astype(np.int) b[[0, 2]] = np.clip(b[[0, 2]], 0, w) # clip boxes outside of image b[[1, 3]] = np.clip(b[[1, 3]], 0, h) assert cv2.imwrite(str(f), im[b[1]:b[3], b[0]:b[2]]), f'box failure in {f}' def autosplit(path='../coco128', weights=(0.9, 0.1, 0.0)): # from utils.datasets import *; autosplit('../coco128') """ Autosplit a dataset into train/val/test splits and save path/autosplit_*.txt files # Arguments path: Path to images directory weights: Train, val, test weights (list) """ path = Path(path) # images dir files = list(path.rglob('*.*')) n = len(files) # number of files indices = random.choices([0, 1, 2], weights=weights, k=n) # assign each image to a split txt = ['autosplit_train.txt', 'autosplit_val.txt', 'autosplit_test.txt'] # 3 txt files [(path / x).unlink() for x in txt if (path / x).exists()] # remove existing for i, img in tqdm(zip(indices, files), total=n): if img.suffix[1:] in img_formats: with open(path / txt[i], 'a') as f: f.write(str(img) + '\n') # add image to txt file