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Getting started with maps in Python
Kristoffer over at rpsychologist.com wrote a really nice tutorial on getting up to speed with maps in R. It looked something like this.
New
The latest blog posts to take off on Hacker News. 1,888 posts.
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Don't test with SQLite when you use Postgres in Production
Yesterday, I was looking for some help trying to have a clean way to roll back database transactions at the end of a test in a Python TestC...
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How to create NBA shot charts in Python
In this post I go over how to extract a player's shot chart data and then plot it using matplotlib and seaborn .
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Some analysis of the 1M most popular sites on the web
Over the last couple of weeks I’ve run some analysis on the one million most popular sites on the web.
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Thoughts on Time-series Databases
Preetam "recently" blogged about catena , a time-series metric store. There was another blog post about benchmarking boltdb by a Fog Creek engineer, also looking to write a time series database. This is something of a pattern in the Go community, which already boasts seriesly , InfluxDB , and prometheus ; there are…
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The Universal Data Structure
Whether you write compilers, web services or Django admin panels, you probably use hash maps more than all other data structures combined. In fact, you may not remember the last time you used anything else. This is not a coincidence: any conceivable data structure can be implemented with a hash map; therefore, there…
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DataLake
A Data Lake is a store that hold raw data as a source for data scientists to explore ways to gain information. It should not be accessed by end-users or used for system integration.
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Redis Geo
Note (version) : I wrote this originally as a Redis module in early 2014, then Redis included a modified version directly into official Redis releases in 2016. Note (implementation) : The implementation included with Redis 3.2+ changed some parameter orderings from my original (intentional, well-thought-out) design…
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Open-Source Loan-Level Analysis of Fannie and Freddie
[M]ortgages were acknowledged to be the most mathematically complex securities in the marketplace. The complexity arose entirely out of the option the homeowner has to prepay his loan; it was poetic …
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High Frequency Trading Strategies
Discusses performance characteristics of high frequency trading strategies and the requirements for implementation
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Modelling game economy with Neo4j
Learn to build production-ready serverless applications on AWS
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Top data mining algorithms in plain English
Today, I'm going to explain in plain English the top 10 most influential data mining algorithms as voted on by 3 separate panels in this survey paper. Once you know what they are, how they work, what they do and where you ... Read More
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Please stop calling databases CP or AP
This blog post has been translated into Russian , Japanese , Chinese , and Chinese again . For more detail on problems with CAP, and a proposal for an alternative, please see my paper A Critique of the CAP Theorem .
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Call me maybe: Aerospike
Previously, on Jepsen, we reviewed Elasticsearch’s progress in addressing data-loss bugs during network partitions. Today, we’ll see Aerospike 3.5.4, an “ACID database”, react violently to a basic partition.
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Call me maybe: Elasticsearch 1.5.0
Previously, on Jepsen , we demonstrated stale and dirty reads in MongoDB . In this post, we return to Elasticsearch, which loses data when the network fails, nodes pause, or processes crash.
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Building a ‘People Who Like This Also Like’ Feature
A while ago a friend of mine asked me how I would go about building a ‘People Who Like This Also Like …’ feature for a music startup he was working at. For each band or musician, he wanted to display a list of other artists that people might also be interested in.
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Data Science from Scratch: First Principles with Python
I am super-excited to announce that the book I've been working on for more than the last year, Data Science from Scratch: First Principles with Python is finally available! (buy from O'Reilly, use...
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High Frequency Trading on the Coinbase Exchange
by Andrew Barisser
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Call Me Maybe: MongoDB Stale Reads
Please note: our followup analysis of 3.4.0-rc3 revealed additional faults in MongoDB’s replication algorithms which could lead to the loss of acknowledged documents–even with Majority Write Concern, journaling, and fsynced writes.
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Finding bugs in SQLite, the easy way
SQLite is probably the most popular embedded database in use today; it is also known for being exceptionally well-tested and robust. In co...
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