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https://github.com/open-mmlab/mmsegmentation.git
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2717ee62f9
* [Feature] Add kenerl updation for some decoder heads. * [Feature] Add kenerl updation for some decoder heads. * directly use forward_feature && modify other 3 decoder heads * remover kernel_update attr * delete unnecessary variables in forward function * delete kernel update function * delete kernel update function * delete unnecessary docstrings * modify comments in self._forward_feature() * modify docstrings in self._forward_feature() * fix docstring * modify uperhead
97 lines
3.2 KiB
Python
97 lines
3.2 KiB
Python
# Copyright (c) OpenMMLab. All rights reserved.
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import torch
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import torch.nn as nn
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from mmcv.cnn import ConvModule
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from ..builder import HEADS
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from .decode_head import BaseDecodeHead
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@HEADS.register_module()
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class FCNHead(BaseDecodeHead):
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"""Fully Convolution Networks for Semantic Segmentation.
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This head is implemented of `FCNNet <https://arxiv.org/abs/1411.4038>`_.
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Args:
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num_convs (int): Number of convs in the head. Default: 2.
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kernel_size (int): The kernel size for convs in the head. Default: 3.
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concat_input (bool): Whether concat the input and output of convs
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before classification layer.
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dilation (int): The dilation rate for convs in the head. Default: 1.
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"""
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def __init__(self,
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num_convs=2,
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kernel_size=3,
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concat_input=True,
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dilation=1,
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**kwargs):
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assert num_convs >= 0 and dilation > 0 and isinstance(dilation, int)
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self.num_convs = num_convs
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self.concat_input = concat_input
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self.kernel_size = kernel_size
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super(FCNHead, self).__init__(**kwargs)
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if num_convs == 0:
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assert self.in_channels == self.channels
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conv_padding = (kernel_size // 2) * dilation
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convs = []
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convs.append(
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ConvModule(
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self.in_channels,
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self.channels,
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kernel_size=kernel_size,
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padding=conv_padding,
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dilation=dilation,
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conv_cfg=self.conv_cfg,
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norm_cfg=self.norm_cfg,
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act_cfg=self.act_cfg))
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for i in range(num_convs - 1):
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convs.append(
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ConvModule(
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self.channels,
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self.channels,
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kernel_size=kernel_size,
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padding=conv_padding,
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dilation=dilation,
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conv_cfg=self.conv_cfg,
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norm_cfg=self.norm_cfg,
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act_cfg=self.act_cfg))
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if num_convs == 0:
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self.convs = nn.Identity()
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else:
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self.convs = nn.Sequential(*convs)
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if self.concat_input:
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self.conv_cat = ConvModule(
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self.in_channels + self.channels,
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self.channels,
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kernel_size=kernel_size,
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padding=kernel_size // 2,
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conv_cfg=self.conv_cfg,
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norm_cfg=self.norm_cfg,
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act_cfg=self.act_cfg)
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def _forward_feature(self, inputs):
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"""Forward function for feature maps before classifying each pixel with
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``self.cls_seg`` fc.
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Args:
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inputs (list[Tensor]): List of multi-level img features.
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Returns:
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feats (Tensor): A tensor of shape (batch_size, self.channels,
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H, W) which is feature map for last layer of decoder head.
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"""
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x = self._transform_inputs(inputs)
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feats = self.convs(x)
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if self.concat_input:
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feats = self.conv_cat(torch.cat([x, feats], dim=1))
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return feats
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def forward(self, inputs):
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"""Forward function."""
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output = self._forward_feature(inputs)
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output = self.cls_seg(output)
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return output
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