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Easy AI with Python

Easy AI with Python 3

By Monty, 19th May 2016

Survey several basic AI techniques implemented with short, open-source Python code recipes. Appropriate for educators and programmers who want to experiment with AI and apply the recipes to their own problem domains. For each technique, learn the basic operating principle, discuss an approach using Python, and review a worked out-example. We’ll cover database mining using neural nets, automated categorization with a naive Bayesian classifier, solving popular puzzles with depth-first and breadth-first searches, solving more complex puzzles with constraint propagation, and playing a popular game using a probing search strategy.

— Raymond Hettinger, Pycon 2009

I haven’t posted here in a few months (for no particularly good reason). Having recently become interested in Artificial Intelligence (AI), especially Machine Learning (ML), and then more especially Artificial Neural Networks (ANN), I was thinking about posting some short AI programs – but I have yet to write any. So today I came across this video of Raymond Hettinger talking about Easy AI with Python. Now if you don’t know about RH, you’re in for a treat! He’s possibly (IMHO) the world’s best teacher of Python, and he’s written a great deal of the Python interpreter. The code fragments in that (old) video seem to me to be ideal for this site, and so I’ll be posting some of them in due course (updated to Python 3). Meanwhile, please enjoy the video, embedded below!

Note that the codes are in Python 2; as just mentioned, I’ll be posting Python 3 versions, but till then, here are some of the things to change if you can’t wait:

  • Remove the x from xrange;
  • Change print to a function, with brackets;
  • More as I notice them.

I’m not sure whether all the programs he describes would be regarded as true AI by everyone, but they’re certainly fun, interesting, useful, and educational. And anyway some of the techniques typically found in AI/ML seem to me to be just ‘curve-fitting’ or some other piece of mathematics or computer science that doesn’t really warrant a fancy name; most of what we program computers to do previously required some level of intelligence. But I’m still a newb at this so I hope I’ll figure it out eventually!

00:00 Intro
05:00 Eight Queens – Six Lines…
06:45 Alphametics Solver…
11:30 Neural Nets for Data Mining…
16:20 Each unique value gets a neuron
22:10 Code
22:30 Mastermind…
31:20 Shannon’s formula applied to strategy – select probe with greatest information
33:55 Sudoku-style Puzzle…
38:50 Bayesian Classifier or…
43:30 Code44:50 Hettinger…
47:30 Q&A

Thanks to GothAlice for uploading this to YouTube.

Artificial intelligence (AI, also machine intelligence, MI) is intelligence demonstrated by machines, in contrast to the natural intelligence (NI) displayed by humans and other animals. In computer science AI research is defined as the study of "intelligent agents": any device that perceives its environment and takes actions that maximize its chance of successfully achieving its goals. Colloquially, the term "artificial intelligence" is applied when a machine mimics "cognitive" functions that humans associate with other human minds, such as "learning" and "problem solving".

The scope of AI is disputed: as machines become increasingly capable, tasks considered as requiring "intelligence" are often removed from the definition, a phenomenon known as the AI effect, leading to the quip, "AI is whatever hasn't been done yet." For instance, optical character recognition is frequently excluded from "artificial intelligence", having become a routine technology. Capabilities generally classified as AI as of 2017 include successfully understanding human speech, competing at the highest level in strategic game systems (such as chess and Go), autonomous cars, intelligent routing in content delivery network and military simulations.

Artificial intelligence was founded as an academic discipline in 1956, and in the years since has experienced several waves of optimism, followed by disappointment and the loss of funding (known as an "AI winter"), followed by new approaches, success and renewed funding. For most of its history, AI research has been divided into subfields that often fail to communicate with each other. These sub-fields are based on technical considerations, such as particular goals (e.g. "robotics" or "machine learning"), the use of particular tools ("logic" or artificial neural networks), or deep philosophical differences. Subfields have also been based on social factors (particular institutions or the work of particular researchers).

The traditional problems (or goals) of AI research include reasoning, knowledge representation, planning, learning, natural language processing, perception and the ability to move and manipulate objects. General intelligence is among the field's long-term goals. Approaches include statistical methods, computational intelligence, and traditional symbolic AI. Many tools are used in AI, including versions of search and mathematical optimization, artificial neural networks, and methods based on statistics, probability and economics. The AI field draws upon computer science, mathematics, psychology, linguistics, philosophy and many others.

The field was founded on the claim that human intelligence "can be so precisely described that a machine can be made to simulate it". This raises philosophical arguments about the nature of the mind and the ethics of creating artificial beings endowed with human-like intelligence which are issues that have been explored by myth, fiction and philosophy since antiquity. Some people also consider AI to be a danger to humanity if it progresses unabatedly. Others believe that AI, unlike previous technological revolutions, will create a risk of mass unemployment.

In the twenty-first century, AI techniques have experienced a resurgence following concurrent advances in computer power, large amounts of data, and theoretical understanding; and AI techniques have become an essential part of the technology industry, helping to solve many challenging problems in computer science.

What do you think?

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