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awkawk是最有用的shell工具之一，名字的来源是三位工程师的名字首字母。
awk introduction
awk主要被用在文字和字符处理领域，作为一个通用的可编程过滤器。
awk面向域（field）而sed面向行（line），awk支持以文件、重定向、管道和标准输入作为程序的输入。更准确的
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Notes：Temporal Relational Reasoning in VideosNotes：Temporal Relational Reasoning in Videos
Abstract：时序关系推理能够关联物体随时间的变化，而时序关系推理是完成一些重要的视频识别任务的关键。该文提出了一
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Notes：Learning Spatiotemporal Features with 3D Convolutional Networks
Abstract：本文提出了一个简单有效的方案，使用3D卷积在大规模视频中来学习空间时序(Spatiotemporal)特征，本文的贡献如下：
相比于2D卷积
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<span id="/2018/11/22/notes-of-stucture-your-machine-learning/" class="leancloud_visitors" data-flag-title="Notes：Deep Learning-structure your machine learning-week2">
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1. 数据分布不一致
训练集和测试集（包含开发集）数据分布不一致被称为Data Mismatch。
我们知道机器学习模型会存在两种异常情况：
高方差：过拟合
高偏差：欠拟合
数据集一般划分为：train、dev、test。其中当dev/test 和 train的数据分布存在不一致（data m
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