57 lines
2.0 KiB
Python
57 lines
2.0 KiB
Python
import pytest
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import torch
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from mmcls.models.utils import PatchMerging
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def cal_unfold_dim(dim, kernel_size, stride, padding=0, dilation=1):
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return (dim + 2 * padding - dilation * (kernel_size - 1) - 1) // stride + 1
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def test_patch_merging():
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settings = dict(
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input_resolution=(56, 56), in_channels=16, expansion_ratio=2)
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downsample = PatchMerging(**settings)
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# test forward with wrong dims
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with pytest.raises(AssertionError):
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inputs = torch.rand((1, 16, 56 * 56))
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downsample(inputs)
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# test patch merging forward
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inputs = torch.rand((1, 56 * 56, 16))
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out = downsample(inputs)
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assert downsample.output_resolution == (28, 28)
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assert out.shape == (1, 28 * 28, 32)
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# test different kernel_size in each direction
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downsample = PatchMerging(kernel_size=(2, 3), **settings)
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out = downsample(inputs)
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expected_dim = cal_unfold_dim(56, 2, 2) * cal_unfold_dim(56, 3, 3)
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assert downsample.sampler.kernel_size == (2, 3)
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assert downsample.output_resolution == (cal_unfold_dim(56, 2, 2),
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cal_unfold_dim(56, 3, 3))
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assert out.shape == (1, expected_dim, 32)
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# test default stride
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downsample = PatchMerging(kernel_size=6, **settings)
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assert downsample.sampler.stride == (6, 6)
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# test stride=3
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downsample = PatchMerging(kernel_size=6, stride=3, **settings)
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out = downsample(inputs)
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assert downsample.sampler.stride == (3, 3)
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assert out.shape == (1, cal_unfold_dim(56, 6, stride=3)**2, 32)
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# test padding
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downsample = PatchMerging(kernel_size=6, padding=2, **settings)
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out = downsample(inputs)
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assert downsample.sampler.padding == (2, 2)
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assert out.shape == (1, cal_unfold_dim(56, 6, 6, padding=2)**2, 32)
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# test dilation
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downsample = PatchMerging(kernel_size=6, dilation=2, **settings)
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out = downsample(inputs)
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assert downsample.sampler.dilation == (2, 2)
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assert out.shape == (1, cal_unfold_dim(56, 6, 6, dilation=2)**2, 32)
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