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examples/lstm_bucketing.pl  view on Meta::CPAN

my $invalid_label = 0;

my ($train_sentences, $vocabulary) = tokenize_text(
    './data/ptb.train.txt', start_label => $start_label,
    invalid_label => $invalid_label
);
my ($validation_sentences) = tokenize_text(
    './data/ptb.test.txt', vocab => $vocabulary,
    start_label => $start_label, invalid_label => $invalid_label
);
my $data_train  = mx->rnn->BucketSentenceIter(
    $train_sentences, $batch_size, buckets => $buckets,
    invalid_label => $invalid_label
);
my $data_val    = mx->rnn->BucketSentenceIter(
    $validation_sentences, $batch_size, buckets => $buckets,
    invalid_label => $invalid_label
);

my $stack = mx->rnn->SequentialRNNCell();
for my $i (0..$num_layers-1)
{
    $stack->add(mx->rnn->LSTMCell(num_hidden => $num_hidden, prefix => "lstm_l${i}_"));
}

my $sym_gen = sub {
    my $seq_len = shift;
    my $data  = mx->sym->Variable('data');
    my $label = mx->sym->Variable('softmax_label');
    my $embed = mx->sym->Embedding(
        data => $data, input_dim => scalar(keys %$vocabulary),
        output_dim => $num_embed, name => 'embed'
    );
    $stack->reset;
    my ($outputs, $states) = $stack->unroll($seq_len, inputs => $embed, merge_outputs => 1);
    my $pred = mx->sym->Reshape($outputs, shape => [-1, $num_hidden]);
    $pred    = mx->sym->FullyConnected(data => $pred, num_hidden => scalar(keys %$vocabulary), name => 'pred');
    $label   = mx->sym->Reshape($label, shape => [-1]);
    $pred    = mx->sym->SoftmaxOutput(data => $pred, label => $label, name => 'softmax');
    return ($pred, ['data'], ['softmax_label']);
};

my $contexts;
if(defined $gpus)
{
    $contexts = [map { mx->gpu($_) } split(/,/, $gpus)];
}
else
{
    $contexts = mx->cpu(0);
}

my $model = mx->mod->BucketingModule(
    sym_gen             => $sym_gen,
    default_bucket_key  => $data_train->default_bucket_key,
    context             => $contexts
);

$model->fit(
    $data_train,
    eval_data           => $data_val,
    eval_metric         => mx->metric->Perplexity($invalid_label),
    kvstore             => $kv_store,
    optimizer           => $optimizer,
    optimizer_params    => {
                                learning_rate => $lr,
                                momentum      => $mom,
                                wd            => $wd,
                        },
    initializer         => mx->init->Xavier(factor_type => "in", magnitude => 2.34),
    num_epoch           => $num_epoch,
    batch_end_callback  => mx->callback->Speedometer($batch_size, $disp_batches),
    ($chkp_epoch ? (epoch_end_callback  => mx->rnn->do_rnn_checkpoint($stack, $chkp_prefix, $chkp_epoch)) : ())
);