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beaucronin / gist:1258210
Created October 3, 2011 00:55
Metropolis sampler pseudocode
x = initial()
prob = target_dist(x)
for i in range(steps):
x_star = propose(x)
prob_star = target_dist(x)
if prob_star > prob or random() < prob_star / prob:
x = x_star
prob = prob_star
@beaucronin
beaucronin / example1.py
Created April 19, 2012 15:26
Veritable uncertainty quantification examples
pr = analysis.predict({'petal_length': 1.5, 'petal_width': None})
interval = pr.credible_values('petal_width')
# => (0.06619570898596525, 0.45519138428493605)
interval[1] - interval[0]
# => 0.38899567529897083
pr = analysis.predict({'petal_length': 5.0, 'petal_width': None})
interval = pr.credible_values('petal_width')
# => (1.3341578189754613, 2.4761532421771784)
interval[1] - interval[0]
@beaucronin
beaucronin / generate.py
Created April 19, 2012 17:43
Learning noisy-XOR with Veritable
# generate some noisy-XOR data
from random import random
N = 1000
noise = 0.1
data = []
for _ in range(N):
x1 = random() < 0.5
@beaucronin
beaucronin / 0_preprocess.py
Created May 15, 2012 21:04
Single-malt scotch
import csv
import json
rd = csv.reader(open('scotch.csv'))
header = rd.next()
colors = header[1:15]
data = []
schema = {
'color': { 'type': 'categorical' },
'AGE': { 'type': 'count' },
@beaucronin
beaucronin / gist:3094654
Created July 12, 2012 00:18
Veritable code to analyze heights and weights with different units
import veritable
import csv
import matplotlib.pyplot as plt
# Load the csv and read into a Veritable dataset using inches and pounds
print 'Reading data from file'
data_inches_pounds = []
with open('heights_weights_genders.csv') as fd:
rd = csv.reader(fd)
rd.next() # skip the header

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@beaucronin
beaucronin / README.md
Last active October 26, 2016 22:01
SSH into an EC2 instance by tag

Usage:

$ ec2-login-amazon <tag>
  • Aside from the AWS CLI tools, you'll need jq: https://stedolan.github.io/jq/
  • If multiple instances have the tag you specify, the first one will be chosen
  • There are separate commands for Amazon Linux and Ubuntu because, aside from looking at the AMI ID, there's no way to know which user name to use
@beaucronin
beaucronin / correlation_examples.R
Created April 27, 2012 14:36
Examples of dependence beyond correlation
#From http://en.wikipedia.org/wiki/File:Correlation_examples2.svg
#Title: An example of the correlation of x and y for various distributions of (x,y) pairs
#Tags: Mathematics; Statistics; Correlation
#Author: Denis Boigelot
#Packets needed : mvtnorm (rmvnorm), RSVGTipsDevice (devSVGTips)
#How to use: output()
#
#This is an translated version in R of an Matematica 6 code by Imagecreator.
Verifying my Blockstack ID is secured with the address 18UUDfVMEwcVHGtjM8jqxzHvLSX95i6fJ9 https://explorer.blockstack.org/address/18UUDfVMEwcVHGtjM8jqxzHvLSX95i6fJ9
@beaucronin
beaucronin / iris.csv
Created April 18, 2012 17:59
Veritable python analysis for Fisher iris data
sepal_length sepal_width petal_length petal_width class
5.1 3.5 1.4 0.2 Iris-setosa
4.9 3.0 1.4 0.2 Iris-setosa
4.7 3.2 1.3 0.2 Iris-setosa
4.6 3.1 1.5 0.2 Iris-setosa
5.0 3.6 1.4 0.2 Iris-setosa
5.4 3.9 1.7 0.4 Iris-setosa
4.6 3.4 1.4 0.3 Iris-setosa
5.0 3.4 1.5 0.2 Iris-setosa
4.4 2.9 1.4 0.2 Iris-setosa