nlpodyssey/spago

// Copyright 2019 spaGO Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package pooling

import (
    "encoding/gob"

    "github.com/nlpodyssey/spago/ag"
    "github.com/nlpodyssey/spago/mat"
    "github.com/nlpodyssey/spago/nn"
)

var _ nn.Model = &MaxPooling{}

// MaxPooling is a parameter-free model used to instantiate a new Processor.
type MaxPooling struct {
    nn.Module
    Rows    int
    Columns int
}

func init() {
    gob.Register(&MaxPooling{})
}

// NewMax returns a new model.
func NewMax(rows, columns int) *MaxPooling {
    return &MaxPooling{
        Rows:    rows,
        Columns: columns,
    }
}

// Forward performs the forward step for each input node and returns the result.
// The max pooling is applied independently to each input.
func (m *MaxPooling) Forward(xs ...mat.Tensor) []mat.Tensor {
    pooled := func(x mat.Tensor) mat.Tensor {
        return ag.MaxPooling(x, m.Rows, m.Columns)
    }
    return ag.Map(pooled, xs)
}