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428 lines
19 KiB
428 lines
19 KiB
# Ultralytics YOLO 🚀, GPL-3.0 license
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import contextlib
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import hashlib
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import json
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import os
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import subprocess
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import time
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from multiprocessing.pool import ThreadPool
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from pathlib import Path
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from tarfile import is_tarfile
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from zipfile import is_zipfile
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import cv2
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import numpy as np
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from PIL import ExifTags, Image, ImageOps
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from tqdm import tqdm
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from ultralytics.nn.autobackend import check_class_names
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from ultralytics.yolo.utils import DATASETS_DIR, LOGGER, NUM_THREADS, ROOT, colorstr, emojis, yaml_load
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from ultralytics.yolo.utils.checks import check_file, check_font, is_ascii
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from ultralytics.yolo.utils.downloads import download, safe_download, unzip_file
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from ultralytics.yolo.utils.ops import segments2boxes
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HELP_URL = 'See https://github.com/ultralytics/yolov5/wiki/Train-Custom-Data'
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IMG_FORMATS = 'bmp', 'dng', 'jpeg', 'jpg', 'mpo', 'png', 'tif', 'tiff', 'webp', 'pfm' # image suffixes
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VID_FORMATS = 'asf', 'avi', 'gif', 'm4v', 'mkv', 'mov', 'mp4', 'mpeg', 'mpg', 'ts', 'wmv', 'webm' # video suffixes
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PIN_MEMORY = str(os.getenv('PIN_MEMORY', True)).lower() == 'true' # global pin_memory for dataloaders
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IMAGENET_MEAN = 0.485, 0.456, 0.406 # RGB mean
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IMAGENET_STD = 0.229, 0.224, 0.225 # RGB standard deviation
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# Get orientation exif tag
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for orientation in ExifTags.TAGS.keys():
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if ExifTags.TAGS[orientation] == 'Orientation':
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break
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def img2label_paths(img_paths):
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# Define label paths as a function of image paths
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sa, sb = f'{os.sep}images{os.sep}', f'{os.sep}labels{os.sep}' # /images/, /labels/ substrings
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return [sb.join(x.rsplit(sa, 1)).rsplit('.', 1)[0] + '.txt' for x in img_paths]
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def get_hash(paths):
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# Returns a single hash value of a list of paths (files or dirs)
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size = sum(os.path.getsize(p) for p in paths if os.path.exists(p)) # sizes
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h = hashlib.sha256(str(size).encode()) # hash sizes
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h.update(''.join(paths).encode()) # hash paths
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return h.hexdigest() # return hash
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def exif_size(img):
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# Returns exif-corrected PIL size
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s = img.size # (width, height)
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with contextlib.suppress(Exception):
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rotation = dict(img._getexif().items())[orientation]
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if rotation in [6, 8]: # rotation 270 or 90
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s = (s[1], s[0])
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return s
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def verify_image_label(args):
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# Verify one image-label pair
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im_file, lb_file, prefix, keypoint, num_cls = args
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# number (missing, found, empty, corrupt), message, segments, keypoints
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nm, nf, ne, nc, msg, segments, keypoints = 0, 0, 0, 0, '', [], None
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try:
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# verify images
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im = Image.open(im_file)
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im.verify() # PIL verify
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shape = exif_size(im) # image size
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shape = (shape[1], shape[0]) # hw
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assert (shape[0] > 9) & (shape[1] > 9), f'image size {shape} <10 pixels'
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assert im.format.lower() in IMG_FORMATS, f'invalid image format {im.format}'
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if im.format.lower() in ('jpg', 'jpeg'):
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with open(im_file, 'rb') as f:
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f.seek(-2, 2)
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if f.read() != b'\xff\xd9': # corrupt JPEG
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ImageOps.exif_transpose(Image.open(im_file)).save(im_file, 'JPEG', subsampling=0, quality=100)
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msg = f'{prefix}WARNING ⚠️ {im_file}: corrupt JPEG restored and saved'
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# verify labels
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if os.path.isfile(lb_file):
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nf = 1 # label found
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with open(lb_file) as f:
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lb = [x.split() for x in f.read().strip().splitlines() if len(x)]
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if any(len(x) > 6 for x in lb) and (not keypoint): # is segment
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classes = np.array([x[0] for x in lb], dtype=np.float32)
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segments = [np.array(x[1:], dtype=np.float32).reshape(-1, 2) for x in lb] # (cls, xy1...)
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lb = np.concatenate((classes.reshape(-1, 1), segments2boxes(segments)), 1) # (cls, xywh)
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lb = np.array(lb, dtype=np.float32)
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nl = len(lb)
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if nl:
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if keypoint:
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assert lb.shape[1] == 56, 'labels require 56 columns each'
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assert (lb[:, 5::3] <= 1).all(), 'non-normalized or out of bounds coordinate labels'
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assert (lb[:, 6::3] <= 1).all(), 'non-normalized or out of bounds coordinate labels'
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kpts = np.zeros((lb.shape[0], 39))
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for i in range(len(lb)):
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kpt = np.delete(lb[i, 5:], np.arange(2, lb.shape[1] - 5, 3)) # remove occlusion param from GT
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kpts[i] = np.hstack((lb[i, :5], kpt))
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lb = kpts
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assert lb.shape[1] == 39, 'labels require 39 columns each after removing occlusion parameter'
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else:
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assert lb.shape[1] == 5, f'labels require 5 columns, {lb.shape[1]} columns detected'
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assert (lb[:, 1:] <= 1).all(), \
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f'non-normalized or out of bounds coordinates {lb[:, 1:][lb[:, 1:] > 1]}'
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# All labels
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max_cls = int(lb[:, 0].max()) # max label count
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assert max_cls <= num_cls, \
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f'Label class {max_cls} exceeds dataset class count {num_cls}. ' \
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f'Possible class labels are 0-{num_cls - 1}'
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assert (lb >= 0).all(), f'negative label values {lb[lb < 0]}'
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_, i = np.unique(lb, axis=0, return_index=True)
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if len(i) < nl: # duplicate row check
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lb = lb[i] # remove duplicates
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if segments:
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segments = [segments[x] for x in i]
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msg = f'{prefix}WARNING ⚠️ {im_file}: {nl - len(i)} duplicate labels removed'
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else:
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ne = 1 # label empty
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lb = np.zeros((0, 39), dtype=np.float32) if keypoint else np.zeros((0, 5), dtype=np.float32)
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else:
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nm = 1 # label missing
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lb = np.zeros((0, 39), dtype=np.float32) if keypoint else np.zeros((0, 5), dtype=np.float32)
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if keypoint:
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keypoints = lb[:, 5:].reshape(-1, 17, 2)
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lb = lb[:, :5]
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return im_file, lb, shape, segments, keypoints, nm, nf, ne, nc, msg
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except Exception as e:
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nc = 1
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msg = f'{prefix}WARNING ⚠️ {im_file}: ignoring corrupt image/label: {e}'
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return [None, None, None, None, None, nm, nf, ne, nc, msg]
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def polygon2mask(imgsz, polygons, color=1, downsample_ratio=1):
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"""
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Args:
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imgsz (tuple): The image size.
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polygons (np.ndarray): [N, M], N is the number of polygons, M is the number of points(Be divided by 2).
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color (int): color
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downsample_ratio (int): downsample ratio
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"""
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mask = np.zeros(imgsz, dtype=np.uint8)
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polygons = np.asarray(polygons)
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polygons = polygons.astype(np.int32)
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shape = polygons.shape
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polygons = polygons.reshape(shape[0], -1, 2)
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cv2.fillPoly(mask, polygons, color=color)
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nh, nw = (imgsz[0] // downsample_ratio, imgsz[1] // downsample_ratio)
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# NOTE: fillPoly firstly then resize is trying the keep the same way
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# of loss calculation when mask-ratio=1.
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mask = cv2.resize(mask, (nw, nh))
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return mask
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def polygons2masks(imgsz, polygons, color, downsample_ratio=1):
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"""
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Args:
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imgsz (tuple): The image size.
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polygons (list[np.ndarray]): each polygon is [N, M], N is number of polygons, M is number of points (M % 2 = 0)
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color (int): color
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downsample_ratio (int): downsample ratio
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"""
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masks = []
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for si in range(len(polygons)):
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mask = polygon2mask(imgsz, [polygons[si].reshape(-1)], color, downsample_ratio)
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masks.append(mask)
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return np.array(masks)
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def polygons2masks_overlap(imgsz, segments, downsample_ratio=1):
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"""Return a (640, 640) overlap mask."""
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masks = np.zeros((imgsz[0] // downsample_ratio, imgsz[1] // downsample_ratio),
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dtype=np.int32 if len(segments) > 255 else np.uint8)
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areas = []
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ms = []
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for si in range(len(segments)):
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mask = polygon2mask(imgsz, [segments[si].reshape(-1)], downsample_ratio=downsample_ratio, color=1)
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ms.append(mask)
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areas.append(mask.sum())
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areas = np.asarray(areas)
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index = np.argsort(-areas)
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ms = np.array(ms)[index]
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for i in range(len(segments)):
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mask = ms[i] * (i + 1)
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masks = masks + mask
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masks = np.clip(masks, a_min=0, a_max=i + 1)
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return masks, index
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def check_det_dataset(dataset, autodownload=True):
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# Download, check and/or unzip dataset if not found locally
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data = check_file(dataset)
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# Download (optional)
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extract_dir = ''
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if isinstance(data, (str, Path)) and (is_zipfile(data) or is_tarfile(data)):
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new_dir = safe_download(data, dir=DATASETS_DIR, unzip=True, delete=False, curl=False)
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data = next((DATASETS_DIR / new_dir).rglob('*.yaml'))
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extract_dir, autodownload = data.parent, False
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# Read yaml (optional)
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if isinstance(data, (str, Path)):
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data = yaml_load(data, append_filename=True) # dictionary
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# Checks
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for k in 'train', 'val':
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if k not in data:
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raise SyntaxError(
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emojis(f"{dataset} '{k}:' key missing ❌.\n'train' and 'val' are required in all data YAMLs."))
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if 'names' not in data and 'nc' not in data:
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raise SyntaxError(emojis(f"{dataset} key missing ❌.\n either 'names' or 'nc' are required in all data YAMLs."))
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if 'names' in data and 'nc' in data and len(data['names']) != data['nc']:
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raise SyntaxError(emojis(f"{dataset} 'names' length {len(data['names'])} and 'nc: {data['nc']}' must match."))
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if 'names' not in data:
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data['names'] = [f'class_{i}' for i in range(data['nc'])]
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else:
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data['nc'] = len(data['names'])
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data['names'] = check_class_names(data['names'])
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# Resolve paths
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path = Path(extract_dir or data.get('path') or Path(data.get('yaml_file', '')).parent) # dataset root
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if not path.is_absolute():
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path = (DATASETS_DIR / path).resolve()
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data['path'] = path # download scripts
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for k in 'train', 'val', 'test':
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if data.get(k): # prepend path
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if isinstance(data[k], str):
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x = (path / data[k]).resolve()
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if not x.exists() and data[k].startswith('../'):
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x = (path / data[k][3:]).resolve()
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data[k] = str(x)
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else:
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data[k] = [str((path / x).resolve()) for x in data[k]]
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# Parse yaml
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train, val, test, s = (data.get(x) for x in ('train', 'val', 'test', 'download'))
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if val:
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val = [Path(x).resolve() for x in (val if isinstance(val, list) else [val])] # val path
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if not all(x.exists() for x in val):
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m = f"\nDataset '{dataset}' images not found ⚠️, missing paths %s" % [str(x) for x in val if not x.exists()]
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if s and autodownload:
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LOGGER.warning(m)
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else:
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raise FileNotFoundError(m)
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t = time.time()
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if s.startswith('http') and s.endswith('.zip'): # URL
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safe_download(url=s, dir=DATASETS_DIR, delete=True)
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r = None # success
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elif s.startswith('bash '): # bash script
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LOGGER.info(f'Running {s} ...')
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r = os.system(s)
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else: # python script
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r = exec(s, {'yaml': data}) # return None
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dt = f'({round(time.time() - t, 1)}s)'
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s = f"success ✅ {dt}, saved to {colorstr('bold', DATASETS_DIR)}" if r in (0, None) else f'failure {dt} ❌'
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LOGGER.info(f'Dataset download {s}\n')
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check_font('Arial.ttf' if is_ascii(data['names']) else 'Arial.Unicode.ttf') # download fonts
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return data # dictionary
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def check_cls_dataset(dataset: str):
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"""
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Check a classification dataset such as Imagenet.
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Copy code
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This function takes a `dataset` name as input and returns a dictionary containing information about the dataset.
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If the dataset is not found, it attempts to download the dataset from the internet and save it to the local file system.
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Args:
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dataset (str): Name of the dataset.
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Returns:
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data (dict): A dictionary containing the following keys and values:
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'train': Path object for the directory containing the training set of the dataset
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'val': Path object for the directory containing the validation set of the dataset
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'test': Path object for the directory containing the test set of the dataset
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'nc': Number of classes in the dataset
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'names': List of class names in the dataset
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"""
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data_dir = (DATASETS_DIR / dataset).resolve()
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if not data_dir.is_dir():
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LOGGER.info(f'\nDataset not found ⚠️, missing path {data_dir}, attempting download...')
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t = time.time()
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if dataset == 'imagenet':
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subprocess.run(f"bash {ROOT / 'yolo/data/scripts/get_imagenet.sh'}", shell=True, check=True)
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else:
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url = f'https://github.com/ultralytics/yolov5/releases/download/v1.0/{dataset}.zip'
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download(url, dir=data_dir.parent)
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s = f"Dataset download success ✅ ({time.time() - t:.1f}s), saved to {colorstr('bold', data_dir)}\n"
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LOGGER.info(s)
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train_set = data_dir / 'train'
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val_set = data_dir / 'val' if (data_dir / 'val').exists() else None # data/test or data/val
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test_set = data_dir / 'test' if (data_dir / 'test').exists() else None # data/val or data/test
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nc = len([x for x in (data_dir / 'train').glob('*') if x.is_dir()]) # number of classes
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names = [x.name for x in (data_dir / 'train').iterdir() if x.is_dir()] # class names list
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names = dict(enumerate(sorted(names)))
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return {'train': train_set, 'val': val_set, 'test': test_set, 'nc': nc, 'names': names}
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class HUBDatasetStats():
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""" Class for generating HUB dataset JSON and `-hub` dataset directory
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Arguments
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path: Path to data.yaml or data.zip (with data.yaml inside data.zip)
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autodownload: Attempt to download dataset if not found locally
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Usage
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from ultralytics.yolo.data.utils import HUBDatasetStats
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stats = HUBDatasetStats('coco128.yaml', autodownload=True) # usage 1
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stats = HUBDatasetStats('/Users/glennjocher/Downloads/coco6.zip') # usage 2
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stats.get_json(save=False)
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stats.process_images()
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"""
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def __init__(self, path='coco128.yaml', autodownload=False):
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# Initialize class
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zipped, data_dir, yaml_path = self._unzip(Path(path))
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try:
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# data = yaml_load(check_yaml(yaml_path)) # data dict
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data = check_det_dataset(yaml_path, autodownload) # data dict
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if zipped:
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data['path'] = data_dir
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except Exception as e:
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raise Exception('error/HUB/dataset_stats/yaml_load') from e
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self.hub_dir = Path(str(data['path']) + '-hub')
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self.im_dir = self.hub_dir / 'images'
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self.im_dir.mkdir(parents=True, exist_ok=True) # makes /images
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self.stats = {'nc': len(data['names']), 'names': list(data['names'].values())} # statistics dictionary
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self.data = data
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@staticmethod
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def _find_yaml(dir):
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# Return data.yaml file
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files = list(dir.glob('*.yaml')) or list(dir.rglob('*.yaml')) # try root level first and then recursive
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assert files, f'No *.yaml file found in {dir}'
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if len(files) > 1:
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files = [f for f in files if f.stem == dir.stem] # prefer *.yaml files that match dir name
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assert files, f'Multiple *.yaml files found in {dir}, only 1 *.yaml file allowed'
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assert len(files) == 1, f'Multiple *.yaml files found: {files}, only 1 *.yaml file allowed in {dir}'
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return files[0]
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def _unzip(self, path):
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# Unzip data.zip
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if not str(path).endswith('.zip'): # path is data.yaml
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return False, None, path
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assert Path(path).is_file(), f'Error unzipping {path}, file not found'
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unzip_file(path, path=path.parent)
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dir = path.with_suffix('') # dataset directory == zip name
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assert dir.is_dir(), f'Error unzipping {path}, {dir} not found. path/to/abc.zip MUST unzip to path/to/abc/'
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return True, str(dir), self._find_yaml(dir) # zipped, data_dir, yaml_path
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def _hub_ops(self, f, max_dim=1920):
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# HUB ops for 1 image 'f': resize and save at reduced quality in /dataset-hub for web/app viewing
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f_new = self.im_dir / Path(f).name # dataset-hub image filename
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try: # use PIL
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im = Image.open(f)
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r = max_dim / max(im.height, im.width) # ratio
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if r < 1.0: # image too large
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im = im.resize((int(im.width * r), int(im.height * r)))
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im.save(f_new, 'JPEG', quality=50, optimize=True) # save
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except Exception as e: # use OpenCV
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LOGGER.info(f'WARNING ⚠️ HUB ops PIL failure {f}: {e}')
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im = cv2.imread(f)
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im_height, im_width = im.shape[:2]
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r = max_dim / max(im_height, im_width) # ratio
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if r < 1.0: # image too large
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im = cv2.resize(im, (int(im_width * r), int(im_height * r)), interpolation=cv2.INTER_AREA)
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cv2.imwrite(str(f_new), im)
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def get_json(self, save=False, verbose=False):
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# Return dataset JSON for Ultralytics HUB
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# from ultralytics.yolo.data import YOLODataset
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from ultralytics.yolo.data.dataloaders.v5loader import LoadImagesAndLabels
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def _round(labels):
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# Update labels to integer class and 6 decimal place floats
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return [[int(c), *(round(x, 4) for x in points)] for c, *points in labels]
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for split in 'train', 'val', 'test':
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if self.data.get(split) is None:
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self.stats[split] = None # i.e. no test set
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continue
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dataset = LoadImagesAndLabels(self.data[split]) # load dataset
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x = np.array([
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np.bincount(label[:, 0].astype(int), minlength=self.data['nc'])
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|
for label in tqdm(dataset.labels, total=len(dataset), desc='Statistics')]) # shape(128x80)
|
|
self.stats[split] = {
|
|
'instance_stats': {
|
|
'total': int(x.sum()),
|
|
'per_class': x.sum(0).tolist()},
|
|
'image_stats': {
|
|
'total': len(dataset),
|
|
'unlabelled': int(np.all(x == 0, 1).sum()),
|
|
'per_class': (x > 0).sum(0).tolist()},
|
|
'labels': [{
|
|
str(Path(k).name): _round(v.tolist())} for k, v in zip(dataset.im_files, dataset.labels)]}
|
|
|
|
# Save, print and return
|
|
if save:
|
|
stats_path = self.hub_dir / 'stats.json'
|
|
LOGGER.info(f'Saving {stats_path.resolve()}...')
|
|
with open(stats_path, 'w') as f:
|
|
json.dump(self.stats, f) # save stats.json
|
|
if verbose:
|
|
LOGGER.info(json.dumps(self.stats, indent=2, sort_keys=False))
|
|
return self.stats
|
|
|
|
def process_images(self):
|
|
# Compress images for Ultralytics HUB
|
|
# from ultralytics.yolo.data import YOLODataset
|
|
from ultralytics.yolo.data.dataloaders.v5loader import LoadImagesAndLabels
|
|
|
|
for split in 'train', 'val', 'test':
|
|
if self.data.get(split) is None:
|
|
continue
|
|
dataset = LoadImagesAndLabels(self.data[split]) # load dataset
|
|
with ThreadPool(NUM_THREADS) as pool:
|
|
for _ in tqdm(pool.imap(self._hub_ops, dataset.im_files), total=len(dataset), desc=f'{split} images'):
|
|
pass
|
|
LOGGER.info(f'Done. All images saved to {self.im_dir}')
|
|
return self.im_dir
|