机器学习听起来很高大上，其本身也确实很复杂。为了将简单问题复杂化，机器学习是模拟或实现人类的学习行为，如果我们从人类的学习行为来理解机器学习，也许就比较容易。
人在认识世界和学习的过程中，通常会先学习抽象的概念入手来了解某个事物或原理，这个概念其实就是对应机器学习的特征工程。
比如我们在学习几何指示的三角形，首先会从符号来认识，然后是了解三角形的定义、性质和计算公式。三角形的定义、性质和计算公式，对应机器学习的特征工程。中国数字化转型网www.szhzxw.cn
通常老师在讲完课程后，会留一些课后作业和家庭作业，用以加深和巩固学生对三角形的概念、定义、性质和计算公司的理解。
那么学生做作业的过程，就是机器学习的训练样本。训练数据是用来帮助机器学习知识、建立起蕴含知识的模型的数据。
为了更好地提升学习效果和学习成绩，学生还会参加课外补习班，然后做各种刷题和模拟练习，这个过程就是让机器学习的有更多的和更有效的训练样本。
在每个学期中，学校通常都会安排周考、月考、期中考、期末考，用以检验学生的学习效果并作为考核的依据，最终的结果就是考上好的高中和好的大学。中国数字化转型网www.szhzxw.cn
学生参加各种考试就是对应机器学习的测试样本。
测试样本是机器学习里模型服务的对象，对测试数据作出正确的预测和反馈，是机器学习一系列活动的最终目的。
再用婴幼儿视觉辨认和学习家庭成员和人物辈分为例（见下图），他们可以从人的穿着、表情动作、年龄等方面的特征，来区分家庭成员或人物辈份。
我们看到，计算机世界所有的技术和手段，包括机器学习，都来源于我们现实日常生活和实践，并且我们普通大众都是能很好地理解。中国数字化转型网www.szhzxw.cn
很多时候父辈和祖辈们，可能他们没读过书，甚至不识字，但中华民族一些古老的知识和智慧（如成语、谚语）他们都能懂，甚至自然而然地去遵从。中国数字化转型网www.szhzxw.cn
这些知识和智慧其实就是我们的基因，这些基因会一代代传递下来，并且不受文字和语言的限制。
这种基因的遗传，其实也可以想象成一段“代码”，假设这段代码是更高维世界设计出来，那么人类也算是高维世界的“人工智能”。中国数字化转型网www.szhzxw.cn
然后人类现又在自身的基因和日常实践基础上，设计出了第N+1代人工智能，并另类延续了人类的基因。
翻译：
What is Machine Learning?
Machine learning sounds fancy, but it’s really complicated. In order to complicate simple problems, machine learning is to simulate or implement human learning behavior, and if we understand machine learning from human learning behavior, it may be easier.中国数字化转型网www.szhzxw.cn
In the process of understanding the world and learning, people usually learn abstract concepts first to understand a certain thing or principle, and this concept is actually the feature engineering corresponding to machine learning.
For example, when we learn the triangle of geometry, we will first understand it from symbols, and then understand the definition, properties and calculation formulas of triangles. The definition, properties and calculation formulas of triangles correspond to the feature engineering of machine learning. China Digital Transformation network www.szhzxw.cn中国数字化转型网www.szhzxw.cn
Usually, after the lecture, the teacher will leave some homework and homework to deepen and consolidate the students’ understanding of the concept, definition, nature and calculation of triangles.
Then the process of the student doing the homework is a training sample of machine learning. Training data is data that is used to help machines learn knowledge and build models that contain knowledge.
In order to better improve the learning effect and academic performance, students will also participate in extracurricular classes. And then do a variety of brushing and simulation exercises, this process is to let the machine learning have more and more effective training samples.
In each semester, the school usually arranges weekly examinations, monthly examinations, mid-term examinations and final examinations to test the learning effect of students and as the basis for assessment. The final result is to be admitted to a good high school and a good university. China Digital Transformation network www.szhzxw.cn中国数字化转型网www.szhzxw.cn
Students taking various tests are samples of machine learning.
The test sample is the object served by the model in machine learning, and making correct prediction and feedback on the test data is the ultimate goal of a series of activities in machine learning.
Using the visual identification and learning of family members and characters as an example (see the figure below). They can distinguish family members or characters from the characteristics of people’s dress, expression, movement, age and other aspects.中国数字化转型网www.szhzxw.cn
We see that all the technologies and methods in the computer world, including machine learning, are derived from our real daily life and practice, and we can understand the general public. China Digital Transformation network www.szhzxw.cn
Most of the time, parents and grandparents may not have read books or even read. But they can understand some ancient knowledge and wisdom of the Chinese nation (such as idioms and proverbs), and even naturally follow them.
This knowledge and wisdom are actually our genes. Which are passed down from generation to generation, and are not limited by words or language.中国数字化转型网www.szhzxw.cn
The inheritance of this gene can also be imagined as a “code”, assuming that this code is designed in a higher-dimensional world. Then human beings are also considered the “artificial intelligence” of the higher-dimensional world. China Digital Transformation network www.szhzxw.cn
Then humans are now designing the N+1 generation of artificial intelligence on the basis of their own genes and daily practices, and the alternative continuation of human genes.
