dypsilon

Frontend Development

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nateware

#
# This config file is a combination of ideas from:
#   http://www.37signals.com/svn/posts/1073-nuts-bolts-haproxy
#   http://www.igvita.com/2008/05/13/load-balancing-qos-with-haproxy/
#   http://wiki.railsmachine.com/HAProxy
#   http://elwoodicious.com/2008/07/15/nginx-haproxy-thin-fastcgi-php5-load-balanced-rails-with-php-support/
#   http://upstream-berlin.com/2008/01/09/using-haproxy-with-multiple-backends-aka-content-switching/
#   http://wiki.railsmachine.com/HAProxy
#   http://gist.github.com/raw/25482/d39fb332edf977602c183194a1cf5e9a0b5264f9
#

debasishg

General Background and Overview

1. Probabilistic Data Structures for Web Analytics and Data Mining : A great overview of the space of probabilistic data structures and how they are used in approximation algorithm implementation.
2. Models and Issues in Data Stream Systems
3. Philippe Flajolet’s contribution to streaming algorithms : A presentation by Jérémie Lumbroso that visits some of the hostorical perspectives and how it all began with Flajolet
4. Approximate Frequency Counts over Data Streams by Gurmeet Singh Manku & Rajeev Motwani : One of the early papers on the subject.
5. [Methods for Finding Frequent Items in Data Streams](http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.187.9800&rep=rep1&t

Nagyman

Workflows (States) in Django

I'm going to cover a simple, but effective, utility for managing state and transitions (aka workflow). We often need to store the state (status) of a model and it should only be in one state at a time.

Common Software Uses

• Publishing (Draft->Approved->Published->Expired->Deleted)

dannguyen

Using Python 3 + Google Cloud Vision API's OCR to extract text from photos and scanned documents

Just a quickie test in Python 3 (using Requests) to see if Google Cloud Vision can be used to effectively OCR a scanned data table and preserve its structure, in the way that products such as ABBYY FineReader can OCR an image and provide Excel-ready output.

The short answer: No. While Cloud Vision provides bounding polygon coordinates in its output, it doesn't provide it at the word or region level, which would be needed to then calculate the data delimiters.

On the other hand, the OCR quality is pretty good, if you just need to identify text anywhere in an image, without regards to its physical coordinates. I've included two examples:

####### 1. A low-resolution photo of road signs

econchick

class Graph:
  def __init__(self):
    self.nodes = set()
    self.edges = defaultdict(list)
    self.distances = {}

  def add_node(self, value):
    self.nodes.add(value)

  def add_edge(self, from_node, to_node, distance):

sspross

Serving Django and Twisted using HAproxy

Why?

Because we wanted to achive the following while developing a webapp using websockets:

Static serving (nginx), Django application (gunicorn) and Websockets service (twisted)

• on the same IP

drkarl

Linux Backup Solutions

I've been looking for the best Linux backup system, and also reading lots of HN comments.

Instead of putting pros and cons of every backup system I'll just list some deal-breakers which would disqualify them.

Also I would like that you, the HN community, would add more deal breakers for these or other backup systems if you know some more and at the same time, if you have data to disprove some of the deal-breakers listed here (benchmarks, info about something being true for older releases but is fixed on newer releases), please share it so that I can edit this list accordingly.

Amanda (comments by sammcj)

• It has a lot of management overhead and that's a problem if you don't have time for a full time backup administrator.

bhenerey

In a perfect world, where things are done well, not just quickly, I would expect to find the following when joining the company:

Documentation

• Accurate / up-to-date systems architecture diagram

• Accurate / up-to-date network diagram

• Out-of-hours support plan

• Incident management plan

garybernhardt

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It's now here, in The Programmer's Compendium. The content is the same as before, but being part of the compendium means that it's actively maintained.