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filter_collection 可以使用的操作符

概览

==, !=, >, < , >=, < =, =~, !~ 解释

== 等于
!= 不等于
> 大于
< 小于
>= 大于等于
< = 小于等于
=~ 匹配
!~ 不匹配

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difference between dc_shell and dc_shell-t

The "-t" extension invokes DC shell in Tcl-mode, which is the
recommended mode, and by default, also XG mode, which is also
recommended. Design Vision is ONLY available in TCL mode, hence no
"-t" extension is needed, and it also comes up in XG mode by default.
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WLM- Wire load Model

在没有物理信息的时候，使用Wire load Model（WLM）模型可以算到net的电容，电阻等数据。所以在DC中会使用WLM模型。

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Design Compiler Topographical Technology

Topographical technology enables you to accurately predict post-layout timing, area, and power during RTL synthesis without the need for wireload model-based timing approximations. It uses Synopsys’ placement and optimization technologies to drive accurate timing prediction within synthesis, ensuring better correlation to the final physical design.
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Synopsys Implementation Tool Guide

Synopsys Implementation Tool Guide
Design Compiler – Logic synthesis
Design Compiler Topographical — DCT(new feature)
Physical Compiler – Physical synthesis
JupiterXT – Floorplanning
Astro – Place and Route for designs down to 65nm design rules
IC Compiler – Next generation Place & Route
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中文分词基本概念

英文是以词为单位的，词与词之间上靠空格隔开，而中文是以字为单位，句子中所有的字连起来才能描述一个意思。例如，英文句子I am a student，翻译成”我是一个学生”。计算机可以很简单的通过空格知道student是一个单词，但是”学”，”生”假如分开来，计算机是无法理解的。必须把他们合在一起才变得有意义。把中文的汉字序列切分成有意义的词，就是中文分词。再比如”研究生命”，可以划分为”研究生/命”，也可以是”研究 /生命”，假如是人脑可以很明显的判断出这里后者的划分更加的确切，但是计算机要做到这一点却是相当的困难。

现有的分词算法有3种：基于字符串匹配的分词算法、基于理解的分词算法和基于统计的分词算法。

什么是中文分词
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