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#!/usr/bin/env python3
# -*- coding: utf-8 -*-
# Copyright 2019 Shigeki Karita
# Apache 2.0 (http://www.apache.org/licenses/LICENSE-2.0)
"""Positionwise feed forward layer definition."""
import torch
class PositionwiseFeedForward(torch.nn.Module):
"""Positionwise feed forward layer.
:param int idim: input dimenstion
:param int hidden_units: number of hidden units
:param float dropout_rate: dropout rate
"""
def __init__(self, idim, hidden_units, dropout_rate, activation=torch.nn.ReLU()):
"""Construct an PositionwiseFeedForward object."""
super(PositionwiseFeedForward, self).__init__()
self.w_1 = torch.nn.Linear(idim, hidden_units)
self.w_2 = torch.nn.Linear(hidden_units, idim)
self.dropout = torch.nn.Dropout(dropout_rate)
self.activation = activation
def forward(self, x):
"""Forward funciton."""
return self.w_2(self.dropout(self.activation(self.w_1(x))))
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