ajschumacher

chi-squared test

import scipy.stats

obs = np.array([[a, b],
                [c, d]])
_, p, _, _ = scipy.stats.chi2_contingency(obs)

ajschumacher

par(pty='s')
par(mfrow=c(1, 2))

ci_lower_bound <- function(pos, n, confidence) {
  if (n == 0) return(0)
  z = qnorm(1 - (1 - confidence) / 2)
  p = pos / n
  (p + z^2 / (2*n) - z * sqrt((p * (1-p) + z^2 / (4*n)) / n )) /
    (1 + z^2 / n)

ajschumacher

#!/usr/bin/env python

import sys
import csv

def MeanAveragePrecision(valid_filename, attempt_filename, at=10):
    at = int(at)
    valid = dict()
    for line in csv.DictReader(open(valid_filename,'r')):
        valid.setdefault(line['source_node'],set()).update(line['destination_nodes'].split(" "))

ajschumacher

SQL workshop!

---

Get everything you can about people.

select * from people

-- comments

ajschumacher

This is Bostock's interactive Reingold-Tilford Tree with data representing the rules of a simple sklearn decision tree. Click on nodes to expand or collapse.

For more, see the complete write-up.

ajschumacher

# inspired by and based on:
# https://julien.danjou.info/python-exceptions-guide/
# https://github.com/jd/julien.danjou.info/blob/master/bin/generate-python-exceptions-graph.py

import builtins

edges = set()
synonyms = {}
for name in dir(builtins):
    item = getattr(builtins, name)

ajschumacher

import time

import pygame
import gym


frame_time = 1.0 / 15  # seconds


pygame.init()

ajschumacher

import random
import math

def mean(elements):
    return sum(elements) / len(elements)

def euclidean_dist(first, second):
    assert len(first) == len(second)
    return sum((f - s)**2 for f, s in zip(first, second))**0.5

ajschumacher

#!/bin/bash

# Start an AWS instance with one of the AMIs provided by:
#  http://www.louisaslett.com/RStudio_AMI/
#
# Get this script and make executable.
#  wget THE_RAW_URL
#  chmod +x build_logins.sh
#
# Then use this script to create many logins on the system.

ajschumacher

Here is text with an email link.

Here is an email in text (someone@somewhere.org).

What about second-line email links?