248 lines
8.2 KiB
Python
248 lines
8.2 KiB
Python
# Copyright (c) OpenMMLab. All rights reserved.
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import pytest
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import torch
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from torch.nn.modules import AvgPool2d
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from torch.nn.modules.batchnorm import _BatchNorm
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from mmcls.models.backbones import SEResNet
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from mmcls.models.backbones.resnet import ResLayer
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from mmcls.models.backbones.seresnet import SEBottleneck, SELayer
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def all_zeros(modules):
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"""Check if the weight(and bias) is all zero."""
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weight_zero = torch.equal(modules.weight.data,
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torch.zeros_like(modules.weight.data))
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if hasattr(modules, 'bias'):
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bias_zero = torch.equal(modules.bias.data,
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torch.zeros_like(modules.bias.data))
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else:
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bias_zero = True
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return weight_zero and bias_zero
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def check_norm_state(modules, train_state):
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"""Check if norm layer is in correct train state."""
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for mod in modules:
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if isinstance(mod, _BatchNorm):
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if mod.training != train_state:
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return False
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return True
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def test_selayer():
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# Test selayer forward
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layer = SELayer(64)
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x = torch.randn(1, 64, 56, 56)
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x_out = layer(x)
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assert x_out.shape == torch.Size([1, 64, 56, 56])
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# Test selayer forward with different ratio
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layer = SELayer(64, ratio=8)
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x = torch.randn(1, 64, 56, 56)
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x_out = layer(x)
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assert x_out.shape == torch.Size([1, 64, 56, 56])
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def test_bottleneck():
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with pytest.raises(AssertionError):
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# Style must be in ['pytorch', 'caffe']
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SEBottleneck(64, 64, style='tensorflow')
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# Test SEBottleneck with checkpoint forward
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block = SEBottleneck(64, 64, with_cp=True)
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assert block.with_cp
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x = torch.randn(1, 64, 56, 56)
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x_out = block(x)
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assert x_out.shape == torch.Size([1, 64, 56, 56])
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# Test Bottleneck style
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block = SEBottleneck(64, 256, stride=2, style='pytorch')
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assert block.conv1.stride == (1, 1)
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assert block.conv2.stride == (2, 2)
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block = SEBottleneck(64, 256, stride=2, style='caffe')
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assert block.conv1.stride == (2, 2)
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assert block.conv2.stride == (1, 1)
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# Test Bottleneck forward
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block = SEBottleneck(64, 64)
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x = torch.randn(1, 64, 56, 56)
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x_out = block(x)
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assert x_out.shape == torch.Size([1, 64, 56, 56])
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def test_res_layer():
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# Test ResLayer of 3 Bottleneck w\o downsample
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layer = ResLayer(SEBottleneck, 3, 64, 64, se_ratio=16)
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assert len(layer) == 3
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assert layer[0].conv1.in_channels == 64
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assert layer[0].conv1.out_channels == 16
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for i in range(1, len(layer)):
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assert layer[i].conv1.in_channels == 64
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assert layer[i].conv1.out_channels == 16
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for i in range(len(layer)):
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assert layer[i].downsample is None
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x = torch.randn(1, 64, 56, 56)
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x_out = layer(x)
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assert x_out.shape == torch.Size([1, 64, 56, 56])
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# Test ResLayer of 3 SEBottleneck with downsample
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layer = ResLayer(SEBottleneck, 3, 64, 256, se_ratio=16)
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assert layer[0].downsample[0].out_channels == 256
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for i in range(1, len(layer)):
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assert layer[i].downsample is None
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x = torch.randn(1, 64, 56, 56)
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x_out = layer(x)
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assert x_out.shape == torch.Size([1, 256, 56, 56])
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# Test ResLayer of 3 SEBottleneck with stride=2
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layer = ResLayer(SEBottleneck, 3, 64, 256, stride=2, se_ratio=8)
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assert layer[0].downsample[0].out_channels == 256
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assert layer[0].downsample[0].stride == (2, 2)
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for i in range(1, len(layer)):
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assert layer[i].downsample is None
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x = torch.randn(1, 64, 56, 56)
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x_out = layer(x)
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assert x_out.shape == torch.Size([1, 256, 28, 28])
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# Test ResLayer of 3 SEBottleneck with stride=2 and average downsample
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layer = ResLayer(
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SEBottleneck, 3, 64, 256, stride=2, avg_down=True, se_ratio=8)
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assert isinstance(layer[0].downsample[0], AvgPool2d)
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assert layer[0].downsample[1].out_channels == 256
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assert layer[0].downsample[1].stride == (1, 1)
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for i in range(1, len(layer)):
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assert layer[i].downsample is None
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x = torch.randn(1, 64, 56, 56)
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x_out = layer(x)
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assert x_out.shape == torch.Size([1, 256, 28, 28])
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def test_seresnet():
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"""Test resnet backbone."""
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with pytest.raises(KeyError):
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# SEResNet depth should be in [50, 101, 152]
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SEResNet(20)
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with pytest.raises(AssertionError):
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# In SEResNet: 1 <= num_stages <= 4
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SEResNet(50, num_stages=0)
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with pytest.raises(AssertionError):
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# In SEResNet: 1 <= num_stages <= 4
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SEResNet(50, num_stages=5)
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with pytest.raises(AssertionError):
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# len(strides) == len(dilations) == num_stages
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SEResNet(50, strides=(1, ), dilations=(1, 1), num_stages=3)
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with pytest.raises(TypeError):
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# pretrained must be a string path
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model = SEResNet(50)
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model.init_weights(pretrained=0)
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with pytest.raises(AssertionError):
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# Style must be in ['pytorch', 'caffe']
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SEResNet(50, style='tensorflow')
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# Test SEResNet50 norm_eval=True
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model = SEResNet(50, norm_eval=True)
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model.init_weights()
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model.train()
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assert check_norm_state(model.modules(), False)
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# Test SEResNet50 with torchvision pretrained weight
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model = SEResNet(
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depth=50,
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norm_eval=True,
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init_cfg=dict(type='Pretrained', checkpoint='torchvision://resnet50'))
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model.init_weights()
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model.train()
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assert check_norm_state(model.modules(), False)
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# Test SEResNet50 with first stage frozen
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frozen_stages = 1
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model = SEResNet(50, frozen_stages=frozen_stages)
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model.init_weights()
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model.train()
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assert model.norm1.training is False
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for layer in [model.conv1, model.norm1]:
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for param in layer.parameters():
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assert param.requires_grad is False
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for i in range(1, frozen_stages + 1):
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layer = getattr(model, f'layer{i}')
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for mod in layer.modules():
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if isinstance(mod, _BatchNorm):
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assert mod.training is False
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for param in layer.parameters():
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assert param.requires_grad is False
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# Test SEResNet50 with BatchNorm forward
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model = SEResNet(50, out_indices=(0, 1, 2, 3))
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model.init_weights()
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model.train()
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imgs = torch.randn(1, 3, 224, 224)
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feat = model(imgs)
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assert len(feat) == 4
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assert feat[0].shape == torch.Size([1, 256, 56, 56])
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assert feat[1].shape == torch.Size([1, 512, 28, 28])
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assert feat[2].shape == torch.Size([1, 1024, 14, 14])
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assert feat[3].shape == torch.Size([1, 2048, 7, 7])
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# Test SEResNet50 with layers 1, 2, 3 out forward
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model = SEResNet(50, out_indices=(0, 1, 2))
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model.init_weights()
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model.train()
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imgs = torch.randn(1, 3, 224, 224)
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feat = model(imgs)
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assert len(feat) == 3
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assert feat[0].shape == torch.Size([1, 256, 56, 56])
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assert feat[1].shape == torch.Size([1, 512, 28, 28])
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assert feat[2].shape == torch.Size([1, 1024, 14, 14])
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# Test SEResNet50 with layers 3 (top feature maps) out forward
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model = SEResNet(50, out_indices=(3, ))
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model.init_weights()
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model.train()
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imgs = torch.randn(1, 3, 224, 224)
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feat = model(imgs)
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assert len(feat) == 1
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assert feat[0].shape == torch.Size([1, 2048, 7, 7])
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# Test SEResNet50 with checkpoint forward
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model = SEResNet(50, out_indices=(0, 1, 2, 3), with_cp=True)
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for m in model.modules():
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if isinstance(m, SEBottleneck):
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assert m.with_cp
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model.init_weights()
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model.train()
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imgs = torch.randn(1, 3, 224, 224)
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feat = model(imgs)
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assert len(feat) == 4
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assert feat[0].shape == torch.Size([1, 256, 56, 56])
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assert feat[1].shape == torch.Size([1, 512, 28, 28])
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assert feat[2].shape == torch.Size([1, 1024, 14, 14])
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assert feat[3].shape == torch.Size([1, 2048, 7, 7])
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# Test SEResNet50 zero initialization of residual
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model = SEResNet(50, out_indices=(0, 1, 2, 3), zero_init_residual=True)
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model.init_weights()
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for m in model.modules():
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if isinstance(m, SEBottleneck):
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assert all_zeros(m.norm3)
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model.train()
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imgs = torch.randn(1, 3, 224, 224)
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feat = model(imgs)
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assert len(feat) == 4
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assert feat[0].shape == torch.Size([1, 256, 56, 56])
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assert feat[1].shape == torch.Size([1, 512, 28, 28])
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assert feat[2].shape == torch.Size([1, 1024, 14, 14])
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assert feat[3].shape == torch.Size([1, 2048, 7, 7])
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