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updates

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This commit is contained in:
Glenn Jocher
2019-03-21 22:41:12 +02:00
parent 8ebb4da5cc
commit 6aef4e6a78
4 changed files with 109 additions and 140 deletions
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utils/datasets.py
+73 -122
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@@ -6,6 +6,7 @@ import random
import cv2
import numpy as np
import torch
from torch.utils.data import Dataset
from utils.utils import xyxy2xywh
@@ -88,152 +89,102 @@ class LoadWebcam: # for inference
return 0
class LoadImagesAndLabels: # for training
def __init__(self, path, batch_size=1, img_size=608, augment=False):
class LoadImagesAndLabels(Dataset): # for training/testing
def __init__(self, path, img_size=416, augment=False):
with open(path, 'r') as file:
self.img_files = file.read().splitlines()
self.img_files = list(filter(lambda x: len(x) > 0, self.img_files))
self.nF = len(self.img_files) # number of image files
self.nB = math.ceil(self.nF / batch_size) # number of batches
assert self.nF > 0, 'No images found in %s' % path
assert len(self.img_files) > 0, 'No images found in %s' % path
self.img_size = img_size
self.augment = augment
self.label_files = [x.replace('images', 'labels').replace('.png', '.txt').replace('.jpg', '.txt')
for x in self.img_files]
self.batch_size = batch_size
self.img_size = img_size
self.augment = augment
def __iter__(self):
self.count = -1
#self.shuffled_vector = np.random.permutation(self.nF) if self.augment else np.arange(self.nF)
return self
def __len__(self):
return len(self.img_files)
def __getitem__(self, index):
imgs, labels0, img_paths, img_shapes = self.load_images(index, index + 1)
img_path = self.img_files[index]
label_path = self.label_files[index]
labels0[:, 0] = index % self.batch_size
labels = torch.zeros(100, 6)
labels[:min(len(labels0), 100)] = labels0 # max 100 labels per image
img = cv2.imread(img_path) # BGR
assert img is not None, 'File Not Found ' + img_path
return imgs.squeeze(0), labels, img_paths, img_shapes
augment_hsv = True
if self.augment and augment_hsv:
# SV augmentation by 50%
fraction = 0.50
img_hsv = cv2.cvtColor(img, cv2.COLOR_BGR2HSV)
S = img_hsv[:, :, 1].astype(np.float32)
V = img_hsv[:, :, 2].astype(np.float32)
def __next__(self):
self.count += 1 # batches
if self.count >= self.nB:
raise StopIteration
a = (random.random() * 2 - 1) * fraction + 1
S *= a
if a > 1:
np.clip(S, a_min=0, a_max=255, out=S)
ia = self.count * self.batch_size # start index
ib = min(ia + self.batch_size, self.nF) # end index
a = (random.random() * 2 - 1) * fraction + 1
V *= a
if a > 1:
np.clip(V, a_min=0, a_max=255, out=V)
return self.load_images(ia, ib)
img_hsv[:, :, 1] = S.astype(np.uint8)
img_hsv[:, :, 2] = V.astype(np.uint8)
cv2.cvtColor(img_hsv, cv2.COLOR_HSV2BGR, dst=img)
def load_images(self, ia, ib):
img_all, labels_all, img_paths, img_shapes = [], [], [], []
for index, files_index in enumerate(range(ia, ib)):
img_path = self.img_files[files_index]
label_path = self.label_files[files_index]
h, w, _ = img.shape
img, ratio, padw, padh = letterbox(img, height=self.img_size)
img = cv2.imread(img_path) # BGR
assert img is not None, 'File Not Found ' + img_path
# Load labels
if os.path.isfile(label_path):
# labels0 = np.loadtxt(label_path, dtype=np.float32).reshape(-1, 5) # SLOWER
with open(label_path, 'r') as file:
lines = file.read().splitlines()
labels0 = np.array([x.split() for x in lines], dtype=np.float32)
augment_hsv = True
if self.augment and augment_hsv:
# SV augmentation by 50%
fraction = 0.50
img_hsv = cv2.cvtColor(img, cv2.COLOR_BGR2HSV)
S = img_hsv[:, :, 1].astype(np.float32)
V = img_hsv[:, :, 2].astype(np.float32)
# Normalized xywh to pixel xyxy format
labels = labels0.copy()
labels[:, 1] = ratio * w * (labels0[:, 1] - labels0[:, 3] / 2) + padw
labels[:, 2] = ratio * h * (labels0[:, 2] - labels0[:, 4] / 2) + padh
labels[:, 3] = ratio * w * (labels0[:, 1] + labels0[:, 3] / 2) + padw
labels[:, 4] = ratio * h * (labels0[:, 2] + labels0[:, 4] / 2) + padh
else:
labels = np.array([])
a = (random.random() * 2 - 1) * fraction + 1
S *= a
if a > 1:
np.clip(S, a_min=0, a_max=255, out=S)
# Augment image and labels
if self.augment:
img, labels, M = random_affine(img, labels, degrees=(-5, 5), translate=(0.10, 0.10), scale=(0.90, 1.10))
a = (random.random() * 2 - 1) * fraction + 1
V *= a
if a > 1:
np.clip(V, a_min=0, a_max=255, out=V)
nL = len(labels)
if nL > 0:
# convert xyxy to xywh
labels[:, 1:5] = xyxy2xywh(labels[:, 1:5].copy()) / self.img_size
img_hsv[:, :, 1] = S.astype(np.uint8)
img_hsv[:, :, 2] = V.astype(np.uint8)
cv2.cvtColor(img_hsv, cv2.COLOR_HSV2BGR, dst=img)
if self.augment:
# random left-right flip
lr_flip = True
if lr_flip & (random.random() > 0.5):
img = np.fliplr(img)
if nL > 0:
labels[:, 1] = 1 - labels[:, 1]
h, w, _ = img.shape
img, ratio, padw, padh = letterbox(img, height=self.img_size)
# random up-down flip
ud_flip = False
if ud_flip & (random.random() > 0.5):
img = np.flipud(img)
if nL > 0:
labels[:, 2] = 1 - labels[:, 2]
# Load labels
if os.path.isfile(label_path):
# labels0 = np.loadtxt(label_path, dtype=np.float32).reshape(-1, 5) # SLOWER
with open(label_path, 'r') as file:
lines = file.read().splitlines()
labels0 = np.array([x.split() for x in lines], dtype=np.float32)
# Normalized xywh to pixel xyxy format
labels = labels0.copy()
labels[:, 1] = ratio * w * (labels0[:, 1] - labels0[:, 3] / 2) + padw
labels[:, 2] = ratio * h * (labels0[:, 2] - labels0[:, 4] / 2) + padh
labels[:, 3] = ratio * w * (labels0[:, 1] + labels0[:, 3] / 2) + padw
labels[:, 4] = ratio * h * (labels0[:, 2] + labels0[:, 4] / 2) + padh
else:
labels = np.array([])
# Augment image and labels
if self.augment:
img, labels, M = random_affine(img, labels, degrees=(-5, 5), translate=(0.10, 0.10), scale=(0.90, 1.10))
plotFlag = False
if plotFlag:
import matplotlib.pyplot as plt
plt.figure(figsize=(10, 10)) if index == 0 else None
plt.subplot(4, 4, index + 1).imshow(img[:, :, ::-1])
plt.plot(labels[:, [1, 3, 3, 1, 1]].T, labels[:, [2, 2, 4, 4, 2]].T, '.-')
plt.axis('off')
nL = len(labels)
if nL > 0:
# convert xyxy to xywh
labels[:, 1:5] = xyxy2xywh(labels[:, 1:5].copy()) / self.img_size
if self.augment:
# random left-right flip
lr_flip = True
if lr_flip & (random.random() > 0.5):
img = np.fliplr(img)
if nL > 0:
labels[:, 1] = 1 - labels[:, 1]
# random up-down flip
ud_flip = False
if ud_flip & (random.random() > 0.5):
img = np.flipud(img)
if nL > 0:
labels[:, 2] = 1 - labels[:, 2]
if nL > 0:
labels = np.concatenate((np.zeros((nL, 1), dtype='float32') + index, labels), 1)
labels_all.append(labels)
img_all.append(img)
img_paths.append(img_path)
img_shapes.append((h, w))
labels_out = np.zeros((100, 6), dtype=np.float32)
if nL > 0:
labels_out[:nL, 1:] = labels # max 100 labels per image
# Normalize
img_all = np.stack(img_all)[:, :, :, ::-1].transpose(0, 3, 1, 2) # list to np.array and BGR to RGB
img_all = np.ascontiguousarray(img_all, dtype=np.float32) # uint8 to float32
img_all /= 255.0 # 0 - 255 to 0.0 - 1.0
img = img[:, :, ::-1].transpose(2, 0, 1) # list to np.array and BGR to RGB
img = np.ascontiguousarray(img, dtype=np.float32) # uint8 to float32
img /= 255.0 # 0 - 255 to 0.0 - 1.0
if len(labels_all) > 0:
labels_all = np.concatenate(labels_all, 0)
else:
labels_all = np.zeros((1, 6), dtype='float32')
labels_all = torch.from_numpy(labels_all)
return torch.from_numpy(img_all), labels_all, img_paths, img_shapes
def __len__(self):
return self.nB # number of batches
return torch.from_numpy(img), torch.from_numpy(labels_out), img_path, (h, w)
def letterbox(img, height=416, color=(127.5, 127.5, 127.5)): # resize a rectangular image to a padded square
utils/utils.py
+3
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@@ -15,6 +15,9 @@ from utils import torch_utils
torch.set_printoptions(linewidth=1320, precision=5, profile='long')
np.set_printoptions(linewidth=320, formatter={'float_kind': '{:11.5g}'.format}) # format short g, %precision=5
# Prevent OpenCV from multithreading (to use PyTorch DataLoader)
cv2.setNumThreads(0)
def float3(x): # format floats to 3 decimals
return float(format(x, '.3f'))