Snippets created by Faisal Waris
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Twitter Stream API
Twitter now provides a streaming API which can be used to obtain a continuous stream of tweets on any set of topics, locations, etc., in real time. Read the full details here. It would be nice to convert this stream into an F# sequence so that it can be treated just as any other sequence if F#. This provides “composability”; separation of the generation of a sequence from its consumption. Here is a snippet that does that.
12 people like this
Like the snippet!Posted: 13 years ago by Faisal Waris
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Twitter OAuth
Generates the value string for the "Authorization:" header given Twitter application/user keys and tokens and the parameters for the request being authorized.
0 people like this
Like the snippet!Posted: 12 years ago by Faisal Waris
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Porter Stemmer
An Implementation of the Porter Stemming Algorithm in F# for text analysis. Please see: http://tartarus.org/martin/PorterStemmer/
3 people like this
Like the snippet!Posted: 12 years ago by Faisal Waris
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Gantt Chart Visualization
Shows how to generate a Gantt chart to visualize a schedule. Note: Requires BinPacking.fs found here: http://fssnip.net/hG
3 people like this
Like the snippet!Posted: 12 years ago by Faisal Waris
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Amazon S3 API
Partial wrapper for Amazon S3 for both the Web and SOAP APIs. Generates signatures for both APIs (which was the tricky part). Uses WSDL Type Provider for SOAP. Uses SOAP for bucket list and delete operations and WebAPI to upload/download object contents (streamed / async)
4 people like this
Like the snippet!Posted: 11 years ago by Faisal Waris
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Tiny Logging Module
High performance asynchronous Logging module with time-based rollover and size-based file retention in under a 100 lines of F# Bug fix: Fixed log file name date time from "yyyyMMddhhmm" to yyyyMMddHHmm" (24 hour clock)
6 people like this
Like the snippet!Posted: 11 years ago by Faisal Waris
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Alternative Actor Implementation for Android
Actor implementation (much simplified) intended for use on mobile devices. Seems to provide better memory usage behavior than native F# Mailbox Processors (MPB) (on Android). Though is not as 'smooth' as native F# MBP. Smoothness here refers to how processing is balanced between consumers and producers (most relevant to single core machines).
8 people like this
Like the snippet!Posted: 11 years ago by Faisal Waris
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xorshift128plus PRNG that mimics System.Random
Faster with much better quality random numbers than System.Random. See https://en.wikipedia.org/wiki/Xorshift
0 people like this
Like the snippet!Posted: 8 years ago by Faisal Waris
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Observable Agent
Extension to Control.Observable module to create an Observable linked to a MailboxProcessor. Messages posted to the mailbox are published to subscribers. Requires a cancelation token which when cancelled sends OnComplete to subscribers. Only the Post method is exposed from the internally created MailboxProcessor.
2 people like this
Like the snippet!Posted: 8 years ago by Faisal Waris
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Live chart of CNTK Error Rate
CNTK is Microsoft's deep learning toolkit. This snippets allows one to view the live error rate on a chart. It relies on FSharp.Charting and FSharp.Control.Reactive and a couple of other F# snippets the links for which are referenced in the code. Use 'track' function to start viewing live charts.
1 people like this
Like the snippet!Posted: 8 years ago by Faisal Waris
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Frequent Pattern Growth algorithm
This is a commonly used algorithm for 'market basket' type analysis. It finds frequent itemsets from a series of transactions. Frequent itemsets are the item combinations that are frequently purchased together. See usage comment for example
0 people like this
Like the snippet!Posted: 6 years ago by Faisal Waris
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Sentiment Classification and Cross-Validation with ML.Net - Sample - Using Anonymous Records
ML.Net sentiment classification and cross-validation example using Gradient Boosted trees Needs to be compiled in a dotnet core F# project. Uses F# 4.6 anonymous records which work well with the ML.Net API static api
2 people like this
Like the snippet!Posted: 6 years ago by Faisal Waris
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Csv Type Provider Schema Parser
Parses the schema string format used by the CSV Type Provider from the FSharp.Data library ...because sometimes you need the metadata. Support for names with underscore
5 people like this
Like the snippet!Posted: 6 years ago by Faisal Waris
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Use of Active Patterns to convert integer to Roman numerals
A good use case for demonstrating the use of active patterns
6 people like this
Like the snippet!Posted: 4 years ago by Faisal Waris
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Group elements of a sequence by time windows of fixed intervals
Function that associates a time window with each element of a sequence. The resulting sequence can then be grouped by the time windows for further processing
3 people like this
Like the snippet!Posted: 4 years ago by Faisal Waris
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Fork an AsyncSeq into n async sequences where the consumption rate is throttled
Replicate an AsyncSeq n-ways. The consumption rate of the resulting consumers are kept in check against each other so that a single consumer does not race too far ahead
3 people like this
Like the snippet!Posted: 4 years ago by Faisal Waris
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Sudoku Solver
Fast Sudoku solver in less than 100 lines of F#
6 people like this
Like the snippet!Posted: 3 years ago by Faisal Waris
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Kernel Density estimation and visualization with MathNet.Numerics and FsPlotly
Sample to estimate and visualize kernel densities of multiple distributions for visual comparison. Here the distributions of NY taxi fares are being compared by payment type (e.g. cash, credit card, etc.)
1 people like this
Like the snippet!Posted: 2 years ago by Faisal Waris
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Seq strided chunks
Overlapping chunks from a sequence - a mix of 'windowed' and 'chunkBySize'. Useful for chopping up sequences for a variety of time-domain analysis tasks (re-write to remove deprecated F# syntax)
1 people like this
Like the snippet!Posted: 1 year ago by Faisal Waris
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Heatmap Color Generating Function
Function to generate color values to reflect the relative intensity of numeric values in a range. --- Fixed edge case of when max=min
4 people like this
Like the snippet!Posted: 12 years ago by Faisal Waris
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Twitter OAuth
Generates the value string for the "Authorization:" header given Twitter application/user keys and tokens and the parameters for the request being authorized. Slightly updated to allow additional oauth parameters to be included in the header. This version handles the case when the token is not yet available, i.e. when you want to request a new token/token_secret pair.
2 people like this
Like the snippet!Posted: 12 years ago by Faisal Waris
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Bin Packing
Implementation of the 'best fit' heuristic algorithm for bin packing problems. Incudes an implementation of 'binary tree with duplicates'. See this blog post for details: http://fwaris.wordpress.com/2013/04/01/best-fit-bin-packing/ Update: Bug fixes and added 'worst fit' heuristic implementation
5 people like this
Like the snippet!Posted: 12 years ago by Faisal Waris
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Simple Crypto
Simple symmetric key cryptogrphy. Ok for low security usages.
5 people like this
Like the snippet!Posted: 11 years ago by Faisal Waris
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Minimum Spanning Tree
An implementation of a minimum spanning tree calculation algorithm based on Kruskal's algorithm
2 people like this
Like the snippet!Posted: 11 years ago by Faisal Waris
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Verify Azure-ACS issued OAuth Simple Web Token
Verifies the OAuth SWT (simple web token) issued by Azure ACS The SWT may be obtained by many methods; one way is: - "How to: Request a Token from ACS via the OAuth WRAP Protocol" (http://msdn.microsoft.com/en-us/library/windowsazure/hh674475.aspx) (Note I used the userid/password method to obtain the token on behalf of a 'service identity' set up in ACS) The token is normally verifed by a 'relying party' such as an ASP.Net website hosting a Web API General ACS documentation is here: http://msdn.microsoft.com/en-us/library/gg429788.aspx
0 people like this
Like the snippet!Posted: 11 years ago by Faisal Waris
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Cross Join Lists
Given a list of lists, the function crossJoin outputs all combination of elements from the inner lists, i.e. each combination is a list which contains elements from each of the inner lists in the input. Note: Order is not preserved
3 people like this
Like the snippet!Posted: 9 years ago by Faisal Waris
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Heatmap Color generation for RGB Colors
Works with System.Drawing Color
1 people like this
Like the snippet!Posted: 8 years ago by Faisal Waris
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CNTK Log File Parser
Parser for CNTK error log file (see https://www.microsoft.com/en-us/research/product/cognitive-toolkit/) tested with version 2.0 beta. The parser can be combined with other tooling such as F# chart to view live error rates, etc. (includes a unix 'tail' like function)
1 people like this
Like the snippet!Posted: 8 years ago by Faisal Waris
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OAuth signed authorization header generator
Generates the authorization header for an OAuth 1.0 enabled service. Tested with Twitter and one other API
1 people like this
Like the snippet!Posted: 6 years ago by Faisal Waris
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Sentiment Classification with ML.Net - Sample
ML.Net sentiment classification example using Gradient Boosted trees Needs to be compiled in a dotnet core F# project Uses F# 4.1 struct tuples which is required by the ML.Net API
2 people like this
Like the snippet!Posted: 6 years ago by Faisal Waris
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unix-like tail function
A simple function that lets you tail log files on windows
1 people like this
Like the snippet!Posted: 6 years ago by Faisal Waris
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Minimal AutoML Binary Classification Sample
Shows how to use ML.Net AutoML capability for binary classification. Now with progress reporting
2 people like this
Like the snippet!Posted: 5 years ago by Faisal Waris
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Useful operator definition for interop with C#
invokes op_Implicit when applied (for implicit conversions). I have found this to be very convenient when using C# libraries
6 people like this
Like the snippet!Posted: 4 years ago by Faisal Waris
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Configure F# Interactive to use Microsoft.ML.Net
Updated to use the new "nuget:..." style references. At this time a workaround is needed to properly load some of the native libraries.
1 people like this
Like the snippet!Posted: 4 years ago by Faisal Waris
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Bayesian Inference with Infer.Net: M&M problem
Solve a sample problem from the book "Think Bayes" by Allen B. Downey. Shows how the problem can be modeled with Infer.Net and also provide the manual solution as presented in the book. The code relies on the Infer.Net "FSharpWrapper" project which is not included in the nuget package (as of now).
4 people like this
Like the snippet!Posted: 3 years ago by Faisal Waris
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Max Flow - push-relabel algorithm
Push-relabel algorithm for Max Flow problems in flow graphs. (Does not check if graph has improper back edges)
3 people like this
Like the snippet!Posted: 3 years ago by Faisal Waris
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groupAdjacent
A variation of another snippet "Seq.groupWhen". This one groups adjacent elements based on a predicate that accepts two arguments - the previous and current elements
2 people like this
Like the snippet!Posted: 2 years ago by Faisal Waris