models/segmentation_models/segformer/modules.py

#Copyright (C) 2022. Huawei Technologies Co., Ltd. All rights reserved.
#
#This program is free software; you can redistribute it and/or modify it under the terms of the BSD 3-Clause License.
#
#This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the BSD 3-Clause License for more details.

import torch.nn as nn
import torch

num_parallel = 1


class ModuleParallel(nn.Module):
    def __init__(self, module):
        super(ModuleParallel, self).__init__()
        self.module = module

    def forward(self, x_parallel):
        return [self.module(x) for x in x_parallel]


class LayerNormParallel(nn.Module):
    def __init__(self, num_features):
        super(LayerNormParallel, self).__init__()
        for i in range(num_parallel):
            setattr(self, 'ln_' + str(i), nn.LayerNorm(num_features, eps=1e-6))

    def forward(self, x_parallel):
        return [getattr(self, 'ln_' + str(i))(x) for i, x in enumerate(x_parallel)]