NAME
Hailo - A pluggable Markov engine analogous to MegaHAL
SYNOPSIS
use strict;
use warnings;
use Hailo;
my $hailo = Hailo->new(
# Or Pg, or Perl ...
storage_class => 'SQLite',
brain_resource => 'brain.db'
);
while (<>) {
$hailo->learn($_);
say $hailo->reply($_);
}DESCRIPTION
Hailo is a fast and lightweight markov engine intended to replace AI::MegaHAL. It has a lightweight Moose-based core with pluggable storage and tokenizer backends.
It is similar to MegaHAL in functionality, the main differences (with the default backends) being better scalability, drastically less memory usage, an improved tokenizer, and tidier output.
With this distribution, you can create, modify, and query Hailo brains. To use Hailo in event-driven POE applications, you can use the POE::Component::Hailo wrapper. One example is POE::Component::IRC::Plugin::Hailo, which implements an IRC chat bot.
Etymology
Hailo is a portmanteau of HAL (as in MegaHAL) and failo.
ATTRIBUTES
brain_resource
The name of the resource (file name, database name) to use as storage. There is no default.
save_on_exit
A boolean value indicating whether Hailo should save its state before its object gets destroyed. Defaults to true.
order
The Markov order (chain length) you want to use for an empty brain. The default is 5.
storage_class
The storage backend to use. Default: 'SQLite'.
This gives you an idea of approximately how the backends compare in speed: Rate DBD::Pg DBD::mysql DBD::SQLite/file DBD::SQLite/memory DBD::Pg 1.96/s -- -20% -40% -56% DBD::mysql 2.46/s 25% -- -25% -45% DBD::SQLite/file 3.29/s 67% 34% -- -27% DBD::SQLite/memory 4.50/s 129% 83% 37% --
To run your own test try running utils/hailo-benchmark in the Hailo distribution.
tokenizer_class
The tokenizer to use. Default: 'Words';
ui_class
The UI to use. Default: 'ReadLine';
storage_args
tokenizer_args
ui_args
A HashRef of arguments for storage/tokenizer/ui backends. See the documentation for the backends for what sort of arguments they accept.
token_separator
Storage backends may choose to store the tokens of an expression as a single string. If so, they will be joined them together with a separator. By default, this is "\t".
METHODS
new
This is the constructor. It accepts the attributes specified in "ATTRIBUTES".
run
Run the application according to the command line arguments.
learn
Takes a string or an array reference of strings, and learns from them.
train
Takes a filename, filehandle or array reference and learns from all its lines. If a filename is passed, the file is assumed to be UTF-8 encoded. Unlike learn, this method sacrifices some safety (disables the database journal, fsyncs, etc) for speed while learning.
reply
Takes an optional line of text and generates a reply that might be relevant.
learn_reply
Takes a string argument, learns from it, and generates a reply that might be relevant.
save
Tells the underlying storage backend to save its state. To override the filename you can provide one as an argument.
stats
Takes no arguments. Returns the number of tokens, expressions, previous token links and next token links.
CAVEATS
All occurences of token_separator will be stripped from your input before it is processed, so make sure it's set to something that is unlikely to appear in it.
SUPPORT
You can join the IRC channel #hailo on FreeNode if you have questions.
SEE ALSO
Hailo: A Perl rewrite of MegaHAL - A blog posting about the motivation behind Hailo
AUTHORS
Hinrik Örn Sigurðsson, hinrik.sig@gmail.com
Ævar Arnfjörð Bjarmason <avar@cpan.org>
LICENSE AND COPYRIGHT
Copyright 2010 Hinrik Örn Sigurðsson and Ævar Arnfjörð Bjarmason <avar@cpan.org>
This program is free software, you can redistribute it and/or modify it under the same terms as Perl itself.