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傅立叶变换的物理意义

原创 2016-04-08 yangboy2

昨天我们分享了一篇《FFT结果的物理意义》一文，有些网友表示看不大明白，为此我们整理重发一篇去年分享过的《傅里叶变换的物理意义》一文，以便大家更好的理解。

1. 先看下面的两幅动画，增加对傅立叶变换的印象

fivejjs

Build docker image

$ cd /path/to/Dockerfile
$ sudo docker build .

View running processes

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Keybase proof

I hereby claim:

• I am fivejjs on github.
• I am jinjunsun (https://keybase.io/jinjunsun) on keybase.
• I have a public key ASBIkHDrGNWV9gLbFeUfFBGomvnPI2ivtyEgj_TmeW50Tgo

To claim this, I am signing this object:

fivejjs

Keybase proof

I hereby claim:

• I am fivejjs on github.
• I am jinjunsun (https://keybase.io/jinjunsun) on keybase.
• I have a public key ASBIkHDrGNWV9gLbFeUfFBGomvnPI2ivtyEgj_TmeW50Tgo

To claim this, I am signing this object:

fivejjs

tmux shortcuts & cheatsheet

start new:

tmux

start new with session name:

tmux new -s myname

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Introductory Material

• Add Graal JIT Compilation to Your JVM Language in 5 Steps, A Tutorial http://stefan-marr.de/2015/11/add-graal-jit-compilation-to-your-jvm-language-in-5-easy-steps-step-1/

• The SimpleLanguage, an example of using Truffle with great JavaDocs https://github.com/graalvm/simplelanguage

• Truffle Tutorial, Christan Wimmer, PLDI 2016, 3h recording https://youtu.be/FJY96_6Y3a4 Slides

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"""
Minimal character-level Vanilla RNN model. Written by Andrej Karpathy (@karpathy)
BSD License
"""
import numpy as np

# data I/O
data = open('input.txt', 'r').read() # should be simple plain text file
chars = list(set(data))
data_size, vocab_size = len(data), len(chars)

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Goal

Want to move computation on machine with much power. We will set up Anaconda 4.0.0 and XGBoost 0.4 (it is tricky installable).

Preliminaries

• Amazon AWS Educate gives 100$ for MIPT students.
• GitHub Students Pack additionaly gives 15$.

Let's start

AWS Console and launching EC2 Instance.

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# source : http://code.google.com/p/natvpn/source/browse/trunk/stun_server_list
# A list of available STUN server.

stun.l.google.com:19302
stun1.l.google.com:19302
stun2.l.google.com:19302
stun3.l.google.com:19302
stun4.l.google.com:19302
stun01.sipphone.com
stun.ekiga.net