Node modules with Delphi and Free Pascal

chakracore-delphi now comes with NodeSample, a new sample console application showing (as of now very limited) support for Node modules. Included are:

• commonmark
• graphql
• json-query
• lodash
• moment

The sample only shows how Node modules can be resolved and used in Delphi and Free Pascal applications. It doesn't implement Node's event loop or any of its internal modules or native bindings like path, fs or http; any scripts referencing them will - for now - raise an exception.

Artificial Intelligence Transgender: Kings and Queens

Researching for some Natural Language Processing tasks for a .NET application recently, I've come across Facebook's FastText library.

FastText is an open-source, free, lightweight library that allows users to learn text representations and text classifiers. It works on standard, generic hardware. Models can later be reduced in size to even fit on mobile devices.
It's written in C++ and builds on modern Mac OS and Linux distributions. Since it uses some C++11 features, it requires a compiler with good C++11 support. Python bindings are included.

Using this library, you can train models which represent words as multi-dimensional vectors. The models can be queried to find correlations between these vectors in the multi-dimensional space. Depending on the volume and quality of your input data, as well as the training parameters you specify, you can obtain better or worse results to your queries. An introductory explanation of how it works: king - man + woman is queen; but why?

An unofficial FastText fork for Windows is available on GitHub. I'm using this as a starting point to create a DLL in Visual Studio, exposing the C++ classes in a "flattened" C-style API as described in the article Using C++ objects in Delphi by Rudy Velthuis. Such a DLL can also be used from .NET via platform invoke.

As a result, when it's done I'll be able to use this library from Python, .NET, Delphi/Free Pascal and JavaScript (by embedding ChakraCore).

Some examples of console output from my experiments:

King - Man + Woman = ? (JavaScript)

C:\Code\fasttextConsole\chakra\Win64\Debug>ftcc ft.js
Loading file "C:\Data\fasttext\wiki\enwik9.bin"...
done.
Computing vectors...
done.
positive words:
king woman
negative words:
man
"queen": 0.7796817421913147
"regnant": 0.7554017305374145
"consort": 0.7433754205703735
"daughter": 0.7231032848358154
"throne": 0.721994161605835

Berlin - Germany + Argentina = ? (C#)

C:\Code\fasttextConsole\cs\ftcs\bin\x64\Debug>ftcs
Loading file "C:\Data\fasttext\wiki\enwik9.bin"...done.
Computing vectors...done.
positive words:
berlin argentina
negative words:
germany
"aires": 0.8183396
"buenos": 0.8142648
"argentinan": 0.7616609
"argentinas": 0.7580159
"caracas": 0.740073

Berlin - Germany + Slovakia = ? (Free Pascal)

C:\Code\fasttextConsole\fpc\bin\x86_64-win64\Debug>ftc
Loading file 'C:\Data\fasttext\wiki\enwik9.bin'...done.
Computing vectors...done.
positive words:
berlin slovakia
negative words:
germany
'zagreb': 0.81 (Oops! ;-))
'bratislava': 0.79 (Yeah!)
'budapesti': 0.79
'slavonski': 0.79
'podgorica': 0.78

Playstation - Sony + Nintendo = ? (JavaScript)

C:\Code\fasttextConsole\chakra\Win64\Debug>ftcc ft.js
Loading file "C:\Data\fasttext\wiki\enwik9.bin"...
done.
Computing vectors...
done.
positive words:
playstation nintendo
negative words:
sony
"gamecube": 0.8729094862937927
"nintendogs": 0.8490696549415588
"playstationjapan": 0.840140163898468
"snes": 0.8312469720840454
"sega": 0.822517454624176

Here are some code examples:

1. C-style API (DLL exported functions)
2. Imports for .NET
3. Wrapper class for .NET
4. C# usage
5. Imports for Pascal
6. Pascal usage
7. Pascal class for ChakraCore host
8. JavaScript usage