64 lines
2.1 KiB
Python
64 lines
2.1 KiB
Python
#####################################################
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# Copyright (c) Xuanyi Dong [GitHub D-X-Y], 2019.01 #
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#####################################################
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import torch.nn as nn
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from ..cell_operations import ResNetBasicblock
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from .cells import InferCell
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# The macro structure for architectures in NAS-Bench-201
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class TinyNetwork(nn.Module):
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def __init__(self, C, N, genotype, num_classes):
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super(TinyNetwork, self).__init__()
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self._C = C
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self._layerN = N
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self.stem = nn.Sequential(
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nn.Conv2d(3, C, kernel_size=3, padding=1, bias=False), nn.BatchNorm2d(C)
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)
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layer_channels = [C] * N + [C * 2] + [C * 2] * N + [C * 4] + [C * 4] * N
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layer_reductions = [False] * N + [True] + [False] * N + [True] + [False] * N
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C_prev = C
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self.cells = nn.ModuleList()
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for index, (C_curr, reduction) in enumerate(
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zip(layer_channels, layer_reductions)
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):
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if reduction:
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cell = ResNetBasicblock(C_prev, C_curr, 2, True)
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else:
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cell = InferCell(genotype, C_prev, C_curr, 1)
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self.cells.append(cell)
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C_prev = cell.out_dim
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self._Layer = len(self.cells)
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self.lastact = nn.Sequential(nn.BatchNorm2d(C_prev), nn.ReLU(inplace=True))
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self.global_pooling = nn.AdaptiveAvgPool2d(1)
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self.classifier = nn.Linear(C_prev, num_classes)
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def get_message(self):
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string = self.extra_repr()
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for i, cell in enumerate(self.cells):
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string += "\n {:02d}/{:02d} :: {:}".format(
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i, len(self.cells), cell.extra_repr()
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)
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return string
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def extra_repr(self):
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return "{name}(C={_C}, N={_layerN}, L={_Layer})".format(
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name=self.__class__.__name__, **self.__dict__
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)
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def forward(self, inputs):
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feature = self.stem(inputs)
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for i, cell in enumerate(self.cells):
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feature = cell(feature)
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out = self.lastact(feature)
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out = self.global_pooling(out)
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out = out.view(out.size(0), -1)
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logits = self.classifier(out)
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return out, logits
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