肝脏是脊椎动物中最关键的代谢器官之一,由于其在人体中的重要功能,例如废物产物和药物的血液排毒。由于肝肿瘤引起的肝病是全球最常见的死亡率之一。因此,在肿瘤发育的早期阶段检测肝肿瘤是医疗治疗的关键部分。许多成像方式可以用作检测肝肿瘤的帮助工具。计算机断层扫描(CT)是软组织器官(例如肝脏)最常用的成像方式。这是因为它是一种侵入性方式,可以相对迅速捕获。本文提出了一个有效的自动肝分割框架,以使用3D CNN深度元网络模型检测和分割肝脏腹部扫描。许多研究采用了精确分割肝区域,然后使用分割的肝区域作为肿瘤分割方法的输入,因为它降低了由于将腹部器官分割为肿瘤而导致的错误率。所提出的3D CNN DeepMedic模型具有两个输入途径,而不是一个途径,如原始3D CNN模型所示。在本文中,该网络提供了多个腹部CT版本,这有助于提高细分质量。提出的模型分别达到94.36%,94.57%,91.86%和93.14%的精度,灵敏度,特异性和骰子相似性得分。实验结果表明该方法的适用性。
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Large pretrained Transformer-based language models like BERT and GPT have changed the landscape of Natural Language Processing (NLP). However, fine tuning such models still requires a large number of training examples for each target task, thus annotating multiple datasets and training these models on various downstream tasks becomes time consuming and expensive. In this work, we propose a simple extension of the Prototypical Networks for few-shot text classification. Our main idea is to replace the class prototypes by Gaussians and introduce a regularization term that encourages the examples to be clustered near the appropriate class centroids. Experimental results show that our method outperforms various strong baselines on 13 public and 4 internal datasets. Furthermore, we use the class distributions as a tool for detecting potential out-of-distribution (OOD) data points during deployment.
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