Pytorch是一个优秀(illustrious)的深度学习库。
Tensors and Dynamic neural networks in Python with strong GPU acceleration.
深度学习中最重要的单位是：Tensor:
tensor在计算机中表示张量，也就是数量可以变化（向量长度可以伸缩）的向量。
而在生物中则表示：N any muscle that can cause a part to become firm or tense 张肌。
tense与tensor形似，当然意思也是有联系的，tense表示肌肉紧绷，即肌肉紧绷的意思，当然也可以表示情况紧张，心情焦虑。
dynamic /daɪˈnæmɪk/ CET4 TEM4
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ADJ If you describe someone as dynamic, you approve of them because they are full of energy or full of new and exciting ideas. (人) 有活力的; 有创新思维的
例：
He seemed a dynamic and energetic leader.
他看来是个富有创新力与活力的领导。
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ADV 有活力地; 有创新思维地
例：
He’s one of the most dynamically imaginative jazz pianists of our time.
他是我们这个时代最具活跃想像力的爵士乐钢琴演奏家之一。
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ADJ If you describe something as dynamic, you approve of it because it is very active and energetic. (事物) 有活力的
例：
South Asia continues to be the most dynamic economic region in the world.
南亚仍然是世界上最具活力的经济区。
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ADJ A dynamic process is one that constantly changes and progresses. 动态的
例：
…a dynamic, evolving worldwide epidemic.
…一次不断变化发展的、世界范围内的疾疫流行。
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N-COUNT The dynamic of a system or process is the force that causes it to change or progress. 动力
例：
The dynamic of the market demands constant change and adjustment.
市场的动力要求有不断的变化和调整。
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N-PLURAL The dynamics of a situation or group of people are the opposing forces within it that cause it to change. (引发变革的) 反动力
例：
What is needed is insight into the dynamics of the social system.
所需要的就是对社会制度反动力的洞悉。
dynamic，动态的，pytorch中使用的图为动态图，随建随用。
Autograd mechanics
自动求梯度机制
autograd => auto + grad(ient)
auto 作为一个单词来说是汽车的意思。但是作为前缀 auto- 代表自动地，这个单词的前缀就是auto 加上 gradient的其前半部分构成了新词autograd 。
grad作为单词来说是毕业生的意思，也可以叫硕士，是 graduate 毕业生的简写词。
gradient则是梯度的意思 N-COUNT A gradient is a slope, or the degree to which the ground slopes. 斜坡; 倾斜度。
我们来看看mechanic:
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mechanic /mɪˈkænɪk/
|CET6 TEM4
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1.
N-COUNT A mechanic is someone whose job is to repair and maintain machines and engines, especially car engines. 机修工
• If you smell something unusual (gas fumes or burning, for instance), take the car to your mechanic.
如果你闻到了异味（例如汽油味或燃烧味），就把车带给你的修理工。 -
2.
N-PLURAL Themechanicsof a process, system, or activity are the way in which it works or the way in which it is done. 运作方式
• What are the mechanics of this new process?
这一新工序的运作方式是什么？ -
3.
N-UNCOUNT Mechanics is the part of physics that deals with the natural forces that act on moving or stationary objects. 力学
• He has not studied mechanics or engineering.
他没有学习过力学或者工程学。
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而mechanics：力学（用作单数）；结构；技术；机械学（用作单数）。
Broadcasting semantics
广播语法。pytorch可以实现类似于numpy的广播操作语法，即。
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broadcast /ˈbrɔːdˌkɑːst/
|CET4 TEM4 (broadcastingbroadcasts)
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1.
N-COUNT A broadcast is a program, performance, or speech on the radio or on television. (无线电或电视) 广播节目
• In a broadcast on state radio the government announced that it was willing to resume peace negotiations.
在国家电台的广播节目中，政府宣布愿意恢复和平谈判。 -
2.
V-T/V-I To broadcast a program means to send it out by radio waves, wires, or satellites so that it can be heard on the radio or seen on television. (由无线电或电视) 播放
• The concert will be broadcast live on television and radio.
音乐会将通过电视和电台现场直播。• CNN also broadcasts in Europe.
美国有线新闻网络也在欧洲进行广播。
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semantic /sɪˈmæntɪk/
|TEM8
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ADJ Semantic is used to describe things that deal with the meanings of words and sentences. 语义的
He did not want to enter into a semantic debate.
他不想卷入一场关于语义的争论。
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bottleneck /ˈbɒtəlˌnɛk/
|TEM4
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1.
N-COUNT A bottleneck is a place where a road becomes narrow or where it meets another road so that the traffic slows down or stops, often causing traffic jams. 道路上的狭窄处
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2.
N-COUNT A bottleneck is a situation that stops a process or activity from progressing. 瓶颈
• He pushed everyone full speed ahead until production hit a bottleneck.
他敦促每个人全速前进，直到生产遇到瓶颈。
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回顾
tensor 张量，张肌
dynamic 动态的
autograd 自动求梯度
gradient 梯度
mechanics 机制，技术
semantic 语义
bottleneck 瓶颈，障碍物
