fmm

// Just before switching jobs:
// Add one of these.
// Preferably into the same commit where you do a large merge.
//
// This started as a tweet with a joke of "C++ pro-tip: #define private public",
// and then it quickly escalated into more and more evil suggestions.
// I've tried to capture interesting suggestions here.
//
// Contributors: @r2d2rigo, @joeldevahl, @msinilo, @_Humus_,
// @YuriyODonnell, @rygorous, @cmuratori, @mike_acton, @grumpygiant,

fmm

import math
import random

# DATA
# 1st:  Coin B, {HTTTHHTHTH}, 5H,5T
# 2nd:  Coin A, {HHHHTHHHHH}, 9H,1T
# 3rd:  Coin A, {HTHHHHHTHH}, 8H,2T
# 4th:  Coin B, {HTHTTTHHTT}, 4H,6T
# 5th:  Coin A, {THHHTHHHTH}, 7H,3T

fmm

a, b = 1, 10

def func(x,y):
	'''rosenbrock function'''
	return  (a - x)**2 + b*(y - x**2)**2

def gradient(x,y):
	'''gradient of func'''
	dx = 2*(a - x)*(-1) + b*2*(y - x**2)*(-2*x)
	dy = 0 + b*2*(y-x**2)*(1)

fmm

sample = [(1,1), (2,2), (3,4), (4,5)] #(x,y)

def h(theta, x):
	return theta[0] + theta[1]*x

def j(theta):
	total = 0
	for (x,y) in sample:
		total = total + (h(theta, x) - y)**2

fmm

%%%%% sigmoid.m %%%%%
function f = sigmoid(z)
	f = 1 ./ (1 + exp(-z));
end
%%%%%%%%%%%%%%%%%%%%%%%%%

%%%%% likelihood.m %%%%%
function L = likelihood(theta,X,Y)
	h = sigmoid(X * theta); % m x 1
	L = (Y' * log(h)) + ((1 - Y)' * log(1 - h));

fmm

#include <cstdio>
#include <cstdlib>
#include <cmath>

//#define NDEBUG
#include <cassert>
#include <ctime>
#include <cfloat>
#include <climits>
#include <cstring>

fmm

# install build dependencies
sudo yum install -y git-core zlib zlib-devel gcc-c++ patch readline readline-devel libyaml-devel libffi-devel openssl-devel make bzip2 autoconf automake libtool bison curl sqlite-devel

# clone and install rbenv environment
cd ~
git clone git://github.com/sstephenson/rbenv.git .rbenv
git clone git://github.com/sstephenson/ruby-build.git ~/.rbenv/plugins/ruby-build
echo 'export PATH="$HOME/.rbenv/bin:$HOME/.rbenv/plugins/ruby-build/bin:$PATH"' >> ~/.bash_profile
echo 'eval "$(rbenv init -)"' >> ~/.bash_profile