NAME

AI::MXNet - Perl interface to MXNet machine learning library

SYNOPSIS

## Convolutional NN for recognizing hand-written digits in MNIST dataset
## It's considered "Hello, World" for Neural Networks
## For more info about the MNIST problem please refer to http://neuralnetworksanddeeplearning.com/chap1.html

use strict;
use warnings;
use AI::MXNet qw(mx);
use AI::MXNet::TestUtils qw(GetMNIST_ubyte);
use Test::More tests => 1;

# symbol net
my $batch_size = 100;

### model
my $data = mx->symbol->Variable('data');
my $conv1= mx->symbol->Convolution(data => $data, name => 'conv1', num_filter => 32, kernel => [3,3], stride => [2,2]);
my $bn1  = mx->symbol->BatchNorm(data => $conv1, name => "bn1");
my $act1 = mx->symbol->Activation(data => $bn1, name => 'relu1', act_type => "relu");
my $mp1  = mx->symbol->Pooling(data => $act1, name => 'mp1', kernel => [2,2], stride =>[2,2], pool_type=>'max');

my $conv2= mx->symbol->Convolution(data => $mp1, name => 'conv2', num_filter => 32, kernel=>[3,3], stride=>[2,2]);
my $bn2  = mx->symbol->BatchNorm(data => $conv2, name=>"bn2");
my $act2 = mx->symbol->Activation(data => $bn2, name=>'relu2', act_type=>"relu");
my $mp2  = mx->symbol->Pooling(data => $act2, name => 'mp2', kernel=>[2,2], stride=>[2,2], pool_type=>'max');


my $fl   = mx->symbol->Flatten(data => $mp2, name=>"flatten");
my $fc1  = mx->symbol->FullyConnected(data => $fl,  name=>"fc1", num_hidden=>30);
my $act3 = mx->symbol->Activation(data => $fc1, name=>'relu3', act_type=>"relu");
my $fc2  = mx->symbol->FullyConnected(data => $act3, name=>'fc2', num_hidden=>10);
my $softmax = mx->symbol->SoftmaxOutput(data => $fc2, name => 'softmax');

# check data
GetMNIST_ubyte();

my $train_dataiter = mx->io->MNISTIter({
    image=>"data/train-images-idx3-ubyte",
    label=>"data/train-labels-idx1-ubyte",
    data_shape=>[1, 28, 28],
    batch_size=>$batch_size, shuffle=>1, flat=>0, silent=>0, seed=>10});
my $val_dataiter = mx->io->MNISTIter({
    image=>"data/t10k-images-idx3-ubyte",
    label=>"data/t10k-labels-idx1-ubyte",
    data_shape=>[1, 28, 28],
    batch_size=>$batch_size, shuffle=>1, flat=>0, silent=>0});

my $n_epoch = 1;
my $mod = mx->mod->new(symbol => $softmax);
$mod->fit(
    $train_dataiter,
    eval_data => $val_dataiter,
    optimizer_params=>{learning_rate=>0.01, momentum=> 0.9},
    num_epoch=>$n_epoch
);
my $res = $mod->score($val_dataiter, mx->metric->create('acc'));
ok($res->{accuracy} > 0.8);

DESCRIPTION

Perl interface to MXNet machine learning library.

BUGS AND INCOMPATIBILITIES

Parity with Python interface is mostly achieved, few deprecated
and not often used features left unported for now.

SEE ALSO

http://mxnet.io/
https://github.com/dmlc/mxnet/tree/master/perl-package
Function::Parameters, Mouse

AUTHOR

Sergey Kolychev, <sergeykolychev.github@gmail.com>

COPYRIGHT & LICENSE

This library is licensed under Apache 2.0 license https://www.apache.org/licenses/LICENSE-2.0