mindspore/model_zoo/official/cv/srcnn/src/srcnn.py

# Copyright 2021 Huawei Technologies Co., Ltd
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
# ============================================================================

import mindspore.nn as nn

class SRCNN(nn.Cell):
    def __init__(self, num_channels=1):
        super(SRCNN, self).__init__()
        self.conv1 = nn.Conv2d(num_channels, 64, kernel_size=9, padding=9 // 2, pad_mode='pad')
        self.conv2 = nn.Conv2d(64, 32, kernel_size=5, padding=5 // 2, pad_mode='pad')
        self.conv3 = nn.Conv2d(32, num_channels, kernel_size=5, padding=5 // 2, pad_mode='pad')
        self.relu = nn.ReLU()

    def construct(self, x):
        x = self.relu(self.conv1(x))
        x = self.relu(self.conv2(x))
        x = self.conv3(x)
        return x