|
|
B*Q
发帖数: 25729 | 3 你们都是学什么的?
这么高深
俺文科高材生都看不懂 |
|
j********p
发帖数: 9680 | 4 你们先把 N^x 的概念搞清楚再说别的吧.
别着急丢人了. |
|
|
p*e
发帖数: 6785 | 6 search LASSO regularization |
|
|
y**********g
发帖数: 2728 | 8 擦。虽然我不是liyuanchao,也能解释清楚。
看图。L1 norm是尖的，和rss函数的连接处会出现0的解。
再者你问题也没问清楚，我的理解是你在问model regularization的情况。 |
|
|
N******n
发帖数: 3003 | 10 L2是圆的，到后来shrink的速度越来越慢，
但是L1是匀速的，直接就到0了，如果可能的话。 |
|
|
p*e
发帖数: 6785 | 12 只是L1 相对更容易出现shrink 一个而另外一个变化较小。 L2是同比例shrink |
|
N******n
发帖数: 3003 | 13 一阶求导，L2还有x，L1就是lambda了，不变了。绝对值小于lambda的都是0了。 |
|
N******K
发帖数: 10202 | 14 是不是的取决于object function的形状了？ |
|
|
|
|
N******K
发帖数: 10202 | 18 椭圆level set改改形状 不久交到0点了？
另外 如果我去你们那里面试 回答这个问题 把你的图一画 就算过关了？ |
|
y**********g
发帖数: 2728 | 19 椭圆的形状是由data决定的。不是随便改的。改改形状就是新的contour线，意味着无
法最小化objective function.
你还别说，我还真的没有问过这个问题。你要是能画出这图，然后把这个图解释清楚，
应该算过关。 |
|
N******K
发帖数: 10202 | 20 我说的改改椭圆 就是改改数据 一样
如果这个算过关 那也太容易了 |
|
|
y**********g
发帖数: 2728 | 22 这不是你问的题目吗？就这个题目本身，我感觉回答到这个程度差不多了。 |
|
|
|
f*******9
发帖数: 74 | 25 我昨天就说了嘛，这个高度不太正常。
发信人: firefox99 (sparse), 信区: Military
标 题: Re: 击落客机不是一般导弹干的到的
发信站: BBS 未名空间站 (Thu Jul 17 20:29:16 2014, 美东)
我记得一般洲际飞机飞三四小时后都能达到35000-38000英尺，这个才33000，和乌克兰
禁飞的高度32000相差不远，有点奇怪。 |
|
T**********e
发帖数: 29576 | 26 SpaceX制造发射几百个近地卫星（750哩)，因为轨道低信号速度比同步卫星要快，而且
因为光速在真空里比光纤里快40%，最终网络速度要超过现有地面网。
以后扩大系统，信号可以达到火星殖民地。
Elon Musk's Plan to Build a Space Internet
Musk is tonight hosting a SpaceX event in Seattle, where the company is
opening a new office. The talk will mostly be about SpaceX’s plans for
hiring aerospace and software engineers in the Pacific Northwest to boost
the company’s rocket-building efforts. But he'll also use the talk to
announce his newest idea, which would launch a vast network of communicat... 阅读全帖 |
|
|
e****i
发帖数: 2152 | 28
http://www.foxnews.com/politics/2015/07/09/oregon-allowing-15-y
The list of things 15-year-olds are not legally allowed to do in Oregon is
long: Drive, smoke, donate blood, get a tattoo -- even go to a tanning bed.
But, under a first-in-the-nation policy quietly enacted in January that many
parents are only now finding out about, 15-year-olds are now allowed to get
a sex-change operation. Many residents are stunned to learn they can do it
without parental notification -- and the state will even... 阅读全帖 |
|
G*******n
发帖数: 6889 | 29 Cloud Removal From Optical Satellite Imagery With SAR Imagery Using Sparse
Representation
http://ieeexplore.ieee.org/xpl/login.jsp?tp=&arnumber=7001095&u
[PDF]SSTL NovaSAR-S brochure - Surrey Satellite Technology Ltd
www.sstl.co.uk/.../115184-SSTL-NovaSAR-...
Surrey Satellite Technology
Capability to image day and night and through cloud ... Maritime. •.
NovaSAR is equipped with a wide >400km swath maritime mode for ship
detection across ...
[PDF]Applications of Earth Observation - Surrey ... 阅读全帖 |
|
c******a
发帖数: 4400 | 30 http://www.amazon.com/The-Dark-Forest-Cixin-Liu/product-reviews
Probably the most cerebral (yet still accessable) book I've ever read. A
fantastic sequel to an incredible first book. If I say anything I think I'd
give it away. But if you want to know what our future could look like if we
were driven by fear, this is a great read. If you want to see how society
could change, how it would react differently, how the old becomes mythical,
larger than life, whilst still being just as human as any of ... 阅读全帖 |
|
w*********o
发帖数: 3030 | 31 Nuclear weapons won't work against sparse populated area or a not defined
target
. Don't think Trump is asking this with ISIS in mind, which are small
fractions across different countries. Won't be Russia either because of his
admiration for Putin. Not so hard to guess who he was thinking to threw them
at.
Well, that fits well to the yellow Trump ass kisser's agenda. They are the
kind that need the suffering of other Chinese to feel good about themselves. |
|
m**a
发帖数: 1840 | 32 【 以下文字转载自 EE 讨论区 】
发信人: mola (Super Baby), 信区: EE
标 题: 为极解密：如何看待华为拿下5G“短码”方案？
发信站: BBS 未名空间站 (Thu Dec 8 12:21:31 2016, 美东)
朋友大作，发在知乎。欢迎点赞和转发。
https://www.zhihu.com/question/52732376
美国当地时间11月17日凌晨0点45分，在刚刚结束的3GPP RAN1 87次会议的5G信道编码
方案讨论中，经过艰苦卓绝的努力和万分残酷的竞争，以中国华为公司主推的Polar
Code（极化码）方案，成为5G控制信道eMBB场景编码方案。
编者按
“华为极化码事件”内幕：
极化码获得的并非之前大肆炒作的“短码”。
极化码打败的对手并不是LDPC，而是在控制信道上取代4G现有技术TBCC。
若非极化码最终靠非技术手腕挤进控制信道，华为投资几十亿的5G“三神器”在5G NR
第一阶段业已全部打水漂。
整个5G信道编码又经历一番怎样波澜壮阔的争斗，这背后又隐藏着多少暗流汹涌的阴谋
诡计。“为极解密” 为您最全方位的解析。
为极解... 阅读全帖 |
|
发帖数: 1 | 33 eigenvalue problem on sparse matrix是学术界难题之一，属于尖端科技，为人类解
决了大量工程问题，甚至学术问题也要用到。做这个最强的是ETH Zurich的，听说过这
家吗？够呛。。。lol
你算了2x2 迷你超短裙就出来发表演讲了，厉害~~~
如图 |
|
x****6
发帖数: 4339 | 34 don't put your words in my mouth.
本千少一开始就没有装逼，抱着学习的态度来了解物理。
你一上来就拿sparse matrix来怼我关于量子力学101层次的讨论，有意思吗？
BTW，你下次google的时候能不能上点不带中文的材料。 |
|
发帖数: 1 | 35 赛灵思收购AI芯片独角兽深鉴科技，传出价3亿美元
分享到：
19
124
2018-07-18 21:50:05 字号：A- A A+ 来源：观察者网综合
关键字: 芯片深鉴科技FPGA赛灵思收购人工智能AI
【观察者网 综合报道】一家成立仅两年的国内AI芯片初创独角兽公司深鉴科技（
DeePhi Tech）18日被美国芯片巨头赛灵思（Xilinx）收购。虽然具体交易金额尚未可
知，但业界人士评估，收购金额可能在3亿美金左右。
深鉴科技官网及CEO姚颂随后确认了这一消息。收购后的深鉴科技将继续在其北京办公
室运营。
[点击查看大图]
[点击查看大图]
赛灵思软件业务执行副总裁萨里尔·拉吉（Salil Raje）表示：“我们很欢迎深鉴科技
的加入，期待着他们的加入能进一步增强赛灵思全球领先的工程技术研发力量，加速赛
灵思打造灵活应变智能世界的公司愿景。人才和创新是实现赛灵思公司发展的核心。未
来，赛灵思将继续加大对深鉴科技的投入，不断推进公司从云到端应用领域部署机器学
习加速的共同目标。”
[点击查看大图]
电子工程专辑网站（eetimes.com）援引分析师的话称，分析师表示，此举可为... 阅读全帖 |
|
发帖数: 1 | 36 in China, currently, there are at least 10 million people whose total assets
are over 10 million US dollars
do not cheat you
this is true
but China has 1.4 billion people, 10 million out of 1.4 billion is still
very sparse |
|
w*******e
发帖数: 17 | 37 Louzhu should study some basic ideas of Singular Value Decomposition.
Very often, low-rank matrix factorization means the process of finding a low
-rank matrix to approximate your original matrix.
If you use Frobenius norm to find the best approximation, i.e., minimize
over
|| D -\hat(D) ||_F subject to rank(\hat(D))
then you can get the analytic solution from SVD by simply retaining the top
r singular values (Eckart-Young-Mirsky theorem).
There are many applications based on low-rank matrix... 阅读全帖 |
|
发帖数: 1 | 38 JON KINGMay 9, 2013
WHY DOES MONTANA HAVE A HIGH SUICIDE RATE?
Tweet
Share
Today, May 9, councilors from around the northwest will be meeting in Helena
to learn new techniques for suicide prevention. The meeting place is
interesting, because Montana is, in many ways, an epicenter for suicide in
America. All ten of the states with the highest suicide rates are in the
rocky mountain region.
"It's really a silent epidemic in our state and has been for nearly 100
years," says suicide prevention coor... 阅读全帖 |
|
发帖数: 1 | 39 Yangtze River
RIVER, CHINA
WRITTEN BY: Aleksandr Pavlovich Muranov Charles E. Greer
See Article History
Alternative Titles: Ch’ang Chiang, Chang Jiang, Da Jiang
Yangtze River, Chinese (Pinyin) Chang Jiang or (Wade-Giles romanization) Ch
’ang Chiang, longest river in both China and Asia and third longest river
in the world, with a length of 3,915 miles (6,300 kilometres). Its basin,
extending for some 2,000 miles (3,200 km) from west to east and for more
than 600 miles (1,000 km) from north to so... 阅读全帖 |
|
发帖数: 1 | 40 Yangtze River
RIVER, CHINA
WRITTEN BY: Aleksandr Pavlovich Muranov Charles E. Greer
See Article History
Alternative Titles: Ch’ang Chiang, Chang Jiang, Da Jiang
Yangtze River, Chinese (Pinyin) Chang Jiang or (Wade-Giles romanization) Ch
’ang Chiang, longest river in both China and Asia and third longest river
in the world, with a length of 3,915 miles (6,300 kilometres). Its basin,
extending for some 2,000 miles (3,200 km) from west to east and for more
than 600 miles (1,000 km) from north to so... 阅读全帖 |
|
L*********s
发帖数: 3063 | 41 This is the article I wrote yesterday, first posted Chinese.
是啊，中国共产党是一个邪教。
在70多年前，中国处于长期半分裂状态，美英法德俄意日等在中国都有区域代理人。中
华民国中央政府受制于不与国家配合的地方军阀，国家连铁路在地方省份上的口径都无
法统一时，中国孱弱无力。我们作为一个延续了几千年的政治实体，却被西方看作是下
等人，愚昧的低级动物时，是中国共产党，通过内战结束中国的这个状态。
所以，在除台湾外的基本的国家统一下，中共有了它的第一个原罪：中央集权。
在60多年前，除了中国仅承认的西方殖民地香港和澳门，两个不属于中华人民共和国的
城市土地外，中共驱逐了所有的境外资本势力、特工与军队。在1956年。中国共产党迫
使自己的老师，苏联共产党，从中国辽宁省大连市的旅顺特别区撤军的时候，不惜与全
世界两大霸权国家美国和苏联同时交恶，被全世界进行经济封锁，中共才终于结束了作
为列强的傀儡而存在。无论是西方还是苏联。在苏联的长波电台和联合舰队倡议被中共
拒绝后，中苏彻底交恶，紧接着就是中共备受诟病的三年困难时期饿死成百上千万人。... 阅读全帖 |
|
W*****B
发帖数: 4796 | 42 President Trump Says CDC Now Recommends Americans Consider Cloth Masks In
Public
President Trump said Friday the Centers for Disease Control and Prevention
now recommends that people wear cloth or fabric face masks, which can be
made at home, when entering public spaces such as grocery stores and public
transit stations — not only to protect the people wearing them, but also
others in the vicinity.
Trump emphasized that wearing masks in public is voluntary and said he will
not be doing so.
U.S. ... 阅读全帖 |
|
E*V
发帖数: 17544 | 43 【 以下文字转载自 Military 讨论区 】
发信人: wxqqxwwxq (eatfastnoodle), 信区: Military
标 题: Tajikistan Agrees to Give Land to China
发信站: BBS 未名空间站 (Wed Jan 12 06:10:42 2011, 美东)
DUSHANBE, Tajikistan (AP) — Tajikistan has agreed to give away a portion of
its territory to neighboring China
in a bid to put an end to a land dispute dating back more than a century.
Parliament voted Wednesday in favor of giving up around 1,000 square
kilometers of land in the Central Asian
nation's sparsely populated Pamir Mountains ... 阅读全帖 |
|
w********s
发帖数: 1570 | 44 Officially, Moscow denies that China is a potential threat, and endeavors to
play the political game of promoting friendship with Beijing. As a result,
any suspicion of China is excluded from Moscow's public discussions on
security and military strategies.
But the truth is that cracks have started to emerge in the seemingly solid
ties between the two powers since around 2009, leading Russia to regard
China as a "hypothetical enemy." It is no longer possible to fully
comprehend Russia's military ... 阅读全帖 |
|
H****w
发帖数: 1632 | 45 Janitor
To see or dream that you are a janitor suggests that you need to work on
cleaning up an aspect of your life.
Gardening
To dream that you are gardening symbolizes work or career issues. Consider
how you feel about gardening or the condition of the garden and how it
parallels a waking work issue or situation.
Garden
To see a vegetable or fruit garden in your dream indicates that your hard
work and diligence will pay off in the end. It is also symbolic of stability
, potential, and inner gr... 阅读全帖 |
|
k*******3
发帖数: 918 | 46 The Lord Buddha will also become old? As everyone knows, claiming to be
eight years old well, Lord Buddha Shinto maximum universe Li Hongzhi, this
year 62 years old, teeter, sparse hair, health as less than human, how see
also is not a person over 60 last year, after nearly 60. Really make people
heartache! Don't America Li Hongzhi in the living condition is not good? Or
the Lord Buddha totale badly? I'm afraid the Lord Buddha is not what the
Lord Buddha, just ordinary people a natural law, natu... 阅读全帖 |
|
k*******3
发帖数: 918 | 47 The Lord Buddha will also become old? As everyone knows, claiming to be
eight years old well, Lord Buddha Shinto maximum universe Li Hongzhi, this
year 62 years old, teeter, sparse hair, health as less than human, how see
also is not a person over 60 last year, after nearly 60. Really make people
heartache! Don't America Li Hongzhi in the living condition is not good? Or
the Lord Buddha totale badly? I'm afraid the Lord Buddha is not what the
Lord Buddha, just ordinary people a natural law, natu... 阅读全帖 |
|
l****z
发帖数: 29846 | 48 Charles Q. Choi, LiveScience ContributorDate: 26 July 2011 Time: 07:01 PM ET
Brains are larger in those who live farther from the equator — in order to
help them see better, researchers now suspect.
Scientists have long known that brain volume increases with latitude — that
is, the closer one gets to the poles.
"That might be mistaken for implying that intelligence increases with
latitude," said researcher Robin Dunbar, an evolutionary anthropologist at
the University of Oxford. "Our data sugg... 阅读全帖 |
|
B**W
发帖数: 2273 | 49 With snow scarce, northern US has brown Christmas
December 23, 2011
By JOHN FLESHER
Associated Press
TRAVERSE CITY, Mich. (AP) — Dreams of a white Christmas are hanging by a
thread in the North, where unusually mild weather has left the ground bare
in many places — a welcome reprieve for people who don't like shoveling,
but a lump of coal in the stockings of outdoor sports buffs who miss their
winter wonderland.
From New England to the Dakotas and even parts of the Northern Rockies and
Pacific N... 阅读全帖 |
|
d*****n
发帖数: 2132 | 50 do u even hear the argument? many senior and low income ppl do not have
access to transportation to get id, and the state service is below standard
like close on weekends and sparse for rural area. and most of these voters r
for Democratic. this is just a dirty roc gimick targeted at Democratic
voters. |
|
