11 research outputs found
FSS-1000: A 1000-Class Dataset for Few-Shot Segmentation
Over the past few years, we have witnessed the success of deep learning in
image recognition thanks to the availability of large-scale human-annotated
datasets such as PASCAL VOC, ImageNet, and COCO. Although these datasets have
covered a wide range of object categories, there are still a significant number
of objects that are not included. Can we perform the same task without a lot of
human annotations? In this paper, we are interested in few-shot object
segmentation where the number of annotated training examples are limited to 5
only. To evaluate and validate the performance of our approach, we have built a
few-shot segmentation dataset, FSS-1000, which consists of 1000 object classes
with pixelwise annotation of ground-truth segmentation. Unique in FSS-1000, our
dataset contains significant number of objects that have never been seen or
annotated in previous datasets, such as tiny daily objects, merchandise,
cartoon characters, logos, etc. We build our baseline model using standard
backbone networks such as VGG-16, ResNet-101, and Inception. To our surprise,
we found that training our model from scratch using FSS-1000 achieves
comparable and even better results than training with weights pre-trained by
ImageNet which is more than 100 times larger than FSS-1000. Both our approach
and dataset are simple, effective, and easily extensible to learn segmentation
of new object classes given very few annotated training examples. Dataset is
available at https://github.com/HKUSTCV/FSS-1000
Eucalcemic Parathyroid Hormone Elevation After Parathyroidectomy for Primary Sporadic Hyperparathyroidism: Risk Factors, Trend, and Outcome
BACKGROUND: Patients with eucalcemic parathyroid hormone elevation (ePTH) after parathyroidectomy for primary hyperparathyroidism (HPT) may be at risk of recurrence. We aimed to examine risk factors, trend of PTH level, and outcome of patients with ePTH 6 months after parathyroidectomy. METHODS: A total of 161 primary HPT were analyzed. The 6-month postoperative calcium and PTH levels were obtained. ePTH was defined as an elevated PTH level in the presence of normocalcemia. At 6 months, 98 had eucalcemic normal PTH and 63 (39.1%) had ePTH. Perioperative variables, PTH trend, and outcome were compared between 2 groups. Multivariable analyses were performed to identify independent preoperative and operative/postoperative risk factors for ePTH. RESULTS: Among preoperative factors, advanced age (odds ratio [OR] = 1.042, P = .027) and low 25-hydroxyvitamin D(3) (25OHD(3)) (OR = 1.043, P = .009) were independently associated with ePTH, whereas among operative/postoperative factors, high 10-min intraoperative PTH level (OR = 1.015, P = .040) and high postoperative 3-month PTH (OR = 1.048, P < .001) were independently associated with ePTH. After a mean follow-up of 38.7 months, recurrence rate was similar between the 2 groups (P = 1.00). In the first 2 postoperative years, 75 (46.6%) had ePTH on at least 1 occasion and 8 (5.0%) had persistently ePTH on every occasion. CONCLUSIONS: Advanced age, low 25OHD(3), high 10-min intraoperative PTH, and high postoperative 3-month PTH were independently associated with ePTH at 6-month. Although 39.1% of patients had ePTH at 6 months, more than 50% had at least 1 ePTH within the first 2 years of follow-up. Recurrence appeared similar between those with or without ePTH at 6 months.published_or_final_versionSpringer Open Choice, 21 Feb 201