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| # Copyright (c) OpenMMLab. All rights reserved. | |
| import torch.nn as nn | |
| from mmcv.cnn import ConvModule | |
| from mmcv.runner import BaseModule | |
| from mmocr.models.builder import BACKBONES | |
| class ShallowCNN(BaseModule): | |
| """Implement Shallow CNN block for SATRN. | |
| SATRN: `On Recognizing Texts of Arbitrary Shapes with 2D Self-Attention | |
| <https://arxiv.org/pdf/1910.04396.pdf>`_. | |
| Args: | |
| base_channels (int): Number of channels of input image tensor | |
| :math:`D_i`. | |
| hidden_dim (int): Size of hidden layers of the model :math:`D_m`. | |
| init_cfg (dict or list[dict], optional): Initialization configs. | |
| """ | |
| def __init__(self, | |
| input_channels=1, | |
| hidden_dim=512, | |
| init_cfg=[ | |
| dict(type='Kaiming', layer='Conv2d'), | |
| dict(type='Uniform', layer='BatchNorm2d') | |
| ]): | |
| super().__init__(init_cfg=init_cfg) | |
| assert isinstance(input_channels, int) | |
| assert isinstance(hidden_dim, int) | |
| self.conv1 = ConvModule( | |
| input_channels, | |
| hidden_dim // 2, | |
| kernel_size=3, | |
| stride=1, | |
| padding=1, | |
| bias=False, | |
| norm_cfg=dict(type='BN'), | |
| act_cfg=dict(type='ReLU')) | |
| self.conv2 = ConvModule( | |
| hidden_dim // 2, | |
| hidden_dim, | |
| kernel_size=3, | |
| stride=1, | |
| padding=1, | |
| bias=False, | |
| norm_cfg=dict(type='BN'), | |
| act_cfg=dict(type='ReLU')) | |
| self.pool = nn.MaxPool2d(kernel_size=2, stride=2, padding=0) | |
| def forward(self, x): | |
| """ | |
| Args: | |
| x (Tensor): Input image feature :math:`(N, D_i, H, W)`. | |
| Returns: | |
| Tensor: A tensor of shape :math:`(N, D_m, H/4, W/4)`. | |
| """ | |
| x = self.conv1(x) | |
| x = self.pool(x) | |
| x = self.conv2(x) | |
| x = self.pool(x) | |
| return x | |