Matt Dickenson mcdickenson

Conferences

Hydraconf

Summer School

Summer school on practice and theory of Distributed Computing

Books

Correlation is not causation (???)
No causation without manipulation. (Holland)
All models are wrong, some are useful. (Box)
Statistics is the science of uncertainty. (arguably Tukey)
Statistics is the science of learning from experience, especially experience that arrives a little bit at a time. (Efron)

When should you use DateTime and when should you use Time?

It's a common misconception that [William Shakespeare][1] and [Miguel de Cervantes][2] died on the same day in history - so much so that UNESCO named April 23 as [World Book Day because of this fact][3]. However because England hadn't yet adopted [Gregorian Calendar Reform][4] (and wouldn't until [1752][5]) their deaths are actually 10 days apart. Since Ruby's Time class implements a [proleptic Gregorian calendar][6] and has no concept of calendar reform then there's no way to express this. This is where DateTime steps in:

>> shakespeare = DateTime.iso8601('1616-04-23', Date::ENGLAND)
=> Tue, 23 Apr 1616 00:00:00 +0000
>> cervantes = DateTime.iso8601('1616-04-23', Date::ITALY)
=> Sat, 23 Apr 1616 00:00:00 +0000

Git Cheat Sheet

Commands

Getting Started

git init

or

ANNOUNCEMENT

I have moved this over to the Tech Interview Cheat Sheet Repo and has been expanded and even has code challenges you can run and practice against!

\

	"""coco2kitti.py: Converts MS COCO annotation files to
	Kitti format bounding box label files
	__author__ = "Jon Barker"
	"""

	import os
	from pycocotools.coco import COCO

	def coco2kitti(catNms, annFile):

	set itermRunning to (application "iTerm" is running)
	set scriptPath to quoted form of POSIX path of ((path to me as text) & "::" & "start.sh")
	set user_shell to do shell script "dscl /Search -read /Users/$USER UserShell \| awk '{print $2}'"

	tell application "iTerm"
	activate
	if not (exists window 1) or (itermRunning = false) then
	reopen
	end if

	val inData=sc.textFile("tiny.csv")
	// Read the first line and split by commas
	import scala.collection.immutable.StringOps
	val header= inData.first
	val headerLine = header.split(",").map(_.trim.filter(_ != '"'))
	// Count lines in the file
	inData.count
	// Remove the header from the data
	val rowData = inData.filter(_ != header).cache
	// Divide each row into columns by seperating by commas

	#!/bin/sh

	hash brew &> /dev/null
	if [ $? -eq 1 ]; then
	echo 'Installing Homebrew ...'
	ruby -e "$(curl -fsSL https://raw.github.com/Homebrew/homebrew/go/install)"
	fi

	# Ensure Homebrew formulae are updated
	brew update