Virtual Spring Cleaning Interlude, in which I could do more for Perl

Do not ask what Perl can do for you, ask what you can do for Perl!

In my effort to bring the new signature back to older versions of Perl, I'm maintaining Filter::signatures, a source filter that simply converts the signatures to the equivalent old-style Perl code. That filter works surprisingly well for its simplicity and has caused very little in problems.

Specifying the type of your CPAN dependencies

This is the third article in a series on CPAN distribution metadata. The first article was a general introduction, and the second article looked at dependencies, and in particular the different phases that you can specify dependencies for (configure, build, runtime, test, and develop). In this article, we'll cover the different types of dependencies and how you combine these with the phases (described in the previous article) to specify the dependencies (or prereqs) for your CPAN distribution.

This article is brought to you by MaxMind, a gold Sponsor for this year's Toolchain Summit, being held next month (May) in Lyon, France. The summit is only possible with the support of our sponsors.

Machine learning in Perl, Part2: a calculator, handwritten digits and roboshakespeare.

Hello all,
In my first blog post I've announced AI::MXNet, Perl interface to the MXNet machine learning library.
The eight weeks that passed after that were quite fruitful, I've ported whole python's test suite, fixed multiple bugs, added docs, examples, high level RNN interface, Perl API docs has been added to the official MXNet website.
This time I'd like to review in detail three examples from the examples directory.
First one is a simple calculator, a fully connected net that is structured to learn four basic arithmetic operators: addition, subtraction, multiplication and division.
Second example is a comparison of two different approaches to the task of classification of handwritten digits, and the third one is an example of LSTM RNN network trained to generate Shakespeare like text.

Here is the image (generated by Graphviz ) of the calculator network.

The data input is two numbers, that are being routed via two paths; first path is turning the input values into natural logarithms and feeds these into one neuron sized fully connected layer.

Collisions in Block Names in Jemplate

Two Blocks with the Same Name

In January this year, I got Jemplate in the CPAN Pull Request Challenge. The module implements Template::Toolkit in JavaScript, so you can transfer the burden to process the templates from the server to the client.

One of the open issues in its GitHub repository caught my attention: Jemplate compiled all the templates coming from different files into one large JavaScript code-block. If you declared two blocks with the same name in two different files, they’d end up in the same hash in JavaScript, and only one would survive—but you couldn’t tell which one. Keeping block names unique across files probably isn’t part of common practice, so making the module warn you in such a case sounded like a reasonable requirement.

The Perl Conference USA 2017

The Perl Conference this year is going to be in the DC-Metro area, specifically in Alexandria, VA at the United States Patent Office. We've got some great talks lined up and are continuing to update the schedule at

Register and reserve your spot to listen to speakers like Damian Conway, Mark Jason Dominus and Sawyer X to name a few. You can purchase tickets for our event and/or the tutorial sessions here.

The local PM groups (DC and Baltimore) are really excited about hosting this year's Perl Conference. I hope to see you there.


Signed Up!

Registered for YAPC The Perl Conference 2017. Travel and accommodations arranged!

Excitement level: 3/5 and rising.

Virtual Spring Cleaning (part 2 of XX) - in which I implement fun parts of Excel

I don't mind working with Spreadsheets. Much of my work consists of creating Spreadsheets from SQL queries. Sometimes, the resulting spreadsheet should be a pivot table, listing some values across the spreadsheet. For most of my Spreadsheet-generation needs, Querylet is sufficient, but it cannot create pivot tables.

Alan Kay’s critique of the TPF grants program

Alan Kay:

A few principles:

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