jittor.models.inception 源代码


import jittor as jt
from jittor import nn
__all__ = ['Inception3', 'inception_v3']

[文档] def inception_v3(pretrained=False, progress=True, **kwargs): ''' 构建一个Inception v3模型 Inception v3源自论文 `Rethinking the Inception Architecture for Computer Vision <https://arxiv.org/abs/1512.00567>`__, inception模块通过不同尺寸的卷积核和池化层并行处理输入, 并合并输出, 旨在在不同的尺度上有效提取特征。 参数: - `pretrained` (bool, optional): 表示是否预加载预训练模型。默认为 `False`。 返回值: - 返回构建好的inception_v3模型实例。如果 `pretrained` 为 `True`, 则返回在ImageNet上预训练的模型。 代码示例: >>> import jittor as jt >>> from jittor.models.inception import * >>> net = inception_v3(pretrained=False) >>> x = jt.rand(1, 3, 224, 224) >>> y = net(x) >>> y.shape [1, 1000] ''' model = Inception3(**kwargs) if pretrained: model.load("jittorhub://inception_v3.pkl") return model
[文档] class Inception3(nn.Module): ''' Inception v3源自论文 `Rethinking the Inception Architecture for Computer Vision <https://arxiv.org/abs/1512.00567>`__。inception模块通过不同尺寸的卷积核和池化层并行处理输入, 并合并输出, 旨在在不同的尺度上有效提取特征。 参数: * num_classes (int, optional): 分类的类别数目。默认值: 1000 * aux_logits (bool, optional): 若为True, 则添加一个辅助分支, 可以改善训练。默认值: True * inception_blocks (List[nn.Module], optional): 模型的七个块的列表, 顺序为[conv_block, inception_a, inception_b, inception_c, inception_d, inception_e, inception_aux], 若为None, 则会使用默认的基础块 [BasicConv2d, InceptionA, InceptionB, InceptionC, InceptionD, InceptionE, InceptionAux]。默认值: None * init_weights (bool, optional): 是否初始化权重。默认值: True 属性: - Conv2d_1a_3x3 (nn.Module): 输入层的卷积层。 - Conv2d_2a_3x3 (nn.Module): 第二个卷积层。 - Conv2d_2b_3x3 (nn.Module): 第三个卷积层。 - Conv2d_3b_1x1 (nn.Module): 第四个卷积层。 - Conv2d_4a_3x3 (nn.Module): 第五个卷积层。 - Mixed_5b (nn.Module): 第一个Inception模块。 - Mixed_5c (nn.Module): 第二个Inception模块。 - Mixed_5d (nn.Module): 第三个Inception模块。 - Mixed_6a (nn.Module): 第四个Inception模块。 - Mixed_6b (nn.Module): 第五个Inception模块。 - Mixed_6c (nn.Module): 第六个Inception模块。 - Mixed_6d (nn.Module): 第七个Inception模块。 - Mixed_6e (nn.Module): 第八个Inception模块。 - AuxLogits (nn.Module): 辅助分支。 - Mixed_7a (nn.Module): 第九个Inception模块。 - Mixed_7b (nn.Module): 第十个Inception模块。 - Mixed_7c (nn.Module): 第十一个Inception模块。 - fc (nn.Linear): 全连接层。 代码示例: >>> import jittor as jt >>> from jittor.models.inception import Inception3 >>> model = Inception3(num_classes=1000, aux_logits=True) >>> inputs = jt.rand([1, 3, 299, 299]) >>> model(inputs).shape [1,1000,] ''' def __init__(self, num_classes=1000, aux_logits=True, inception_blocks=None, init_weights=True): super(Inception3, self).__init__() if (inception_blocks is None): inception_blocks = [BasicConv2d, InceptionA, InceptionB, InceptionC, InceptionD, InceptionE, InceptionAux] assert (len(inception_blocks) == 7) conv_block = inception_blocks[0] inception_a = inception_blocks[1] inception_b = inception_blocks[2] inception_c = inception_blocks[3] inception_d = inception_blocks[4] inception_e = inception_blocks[5] inception_aux = inception_blocks[6] self.aux_logits = aux_logits self.Conv2d_1a_3x3 = conv_block(3, 32, kernel_size=3, stride=2) self.Conv2d_2a_3x3 = conv_block(32, 32, kernel_size=3) self.Conv2d_2b_3x3 = conv_block(32, 64, kernel_size=3, padding=1) self.Conv2d_3b_1x1 = conv_block(64, 80, kernel_size=1) self.Conv2d_4a_3x3 = conv_block(80, 192, kernel_size=3) self.Mixed_5b = inception_a(192, pool_features=32) self.Mixed_5c = inception_a(256, pool_features=64) self.Mixed_5d = inception_a(288, pool_features=64) self.Mixed_6a = inception_b(288) self.Mixed_6b = inception_c(768, channels_7x7=128) self.Mixed_6c = inception_c(768, channels_7x7=160) self.Mixed_6d = inception_c(768, channels_7x7=160) self.Mixed_6e = inception_c(768, channels_7x7=192) if aux_logits: self.AuxLogits = inception_aux(768, num_classes) self.Mixed_7a = inception_d(768) self.Mixed_7b = inception_e(1280) self.Mixed_7c = inception_e(2048) self.fc = nn.Linear(2048, num_classes) def _forward(self, x): x = self.Conv2d_1a_3x3(x) x = self.Conv2d_2a_3x3(x) x = self.Conv2d_2b_3x3(x) x = nn.pool(x, 3, "maximum", stride=2) x = self.Conv2d_3b_1x1(x) x = self.Conv2d_4a_3x3(x) x = nn.pool(x, 3, "maximum", stride=2) x = self.Mixed_5b(x) x = self.Mixed_5c(x) x = self.Mixed_5d(x) x = self.Mixed_6a(x) x = self.Mixed_6b(x) x = self.Mixed_6c(x) x = self.Mixed_6d(x) x = self.Mixed_6e(x) aux_defined = self.aux_logits if aux_defined: aux = self.AuxLogits(x) else: aux = None x = self.Mixed_7a(x) x = self.Mixed_7b(x) x = self.Mixed_7c(x) x = nn.AdaptiveAvgPool2d(1)(x) x = nn.Dropout()(x) x = jt.reshape(x, (x.shape[0], (- 1))) x = self.fc(x) return (x, aux) def eager_outputs(self, x, aux): return x def execute(self, x): (x, aux) = self._forward(x) aux_defined = self.aux_logits return self.eager_outputs(x, aux)
class InceptionA(nn.Module): def __init__(self, in_channels, pool_features, conv_block=None): super(InceptionA, self).__init__() if (conv_block is None): conv_block = BasicConv2d self.branch1x1 = conv_block(in_channels, 64, kernel_size=1) self.branch5x5_1 = conv_block(in_channels, 48, kernel_size=1) self.branch5x5_2 = conv_block(48, 64, kernel_size=5, padding=2) self.branch3x3dbl_1 = conv_block(in_channels, 64, kernel_size=1) self.branch3x3dbl_2 = conv_block(64, 96, kernel_size=3, padding=1) self.branch3x3dbl_3 = conv_block(96, 96, kernel_size=3, padding=1) self.branch_pool = conv_block(in_channels, pool_features, kernel_size=1) def _forward(self, x): branch1x1 = self.branch1x1(x) branch5x5 = self.branch5x5_1(x) branch5x5 = self.branch5x5_2(branch5x5) branch3x3dbl = self.branch3x3dbl_1(x) branch3x3dbl = self.branch3x3dbl_2(branch3x3dbl) branch3x3dbl = self.branch3x3dbl_3(branch3x3dbl) branch_pool = nn.pool(x, 3, "mean", stride=1, padding=1) branch_pool = self.branch_pool(branch_pool) outputs = [branch1x1, branch5x5, branch3x3dbl, branch_pool] return outputs def execute(self, x): outputs = self._forward(x) return jt.concat(outputs, dim=1) class InceptionB(nn.Module): def __init__(self, in_channels, conv_block=None): super(InceptionB, self).__init__() if (conv_block is None): conv_block = BasicConv2d self.branch3x3 = conv_block(in_channels, 384, kernel_size=3, stride=2) self.branch3x3dbl_1 = conv_block(in_channels, 64, kernel_size=1) self.branch3x3dbl_2 = conv_block(64, 96, kernel_size=3, padding=1) self.branch3x3dbl_3 = conv_block(96, 96, kernel_size=3, stride=2) def _forward(self, x): branch3x3 = self.branch3x3(x) branch3x3dbl = self.branch3x3dbl_1(x) branch3x3dbl = self.branch3x3dbl_2(branch3x3dbl) branch3x3dbl = self.branch3x3dbl_3(branch3x3dbl) branch_pool = nn.pool(x, 3, "maximum", stride=2) outputs = [branch3x3, branch3x3dbl, branch_pool] return outputs def execute(self, x): outputs = self._forward(x) return jt.concat(outputs, dim=1) class InceptionC(nn.Module): def __init__(self, in_channels, channels_7x7, conv_block=None): super(InceptionC, self).__init__() if (conv_block is None): conv_block = BasicConv2d self.branch1x1 = conv_block(in_channels, 192, kernel_size=1) c7 = channels_7x7 self.branch7x7_1 = conv_block(in_channels, c7, kernel_size=1) self.branch7x7_2 = conv_block(c7, c7, kernel_size=(1, 7), padding=(0, 3)) self.branch7x7_3 = conv_block(c7, 192, kernel_size=(7, 1), padding=(3, 0)) self.branch7x7dbl_1 = conv_block(in_channels, c7, kernel_size=1) self.branch7x7dbl_2 = conv_block(c7, c7, kernel_size=(7, 1), padding=(3, 0)) self.branch7x7dbl_3 = conv_block(c7, c7, kernel_size=(1, 7), padding=(0, 3)) self.branch7x7dbl_4 = conv_block(c7, c7, kernel_size=(7, 1), padding=(3, 0)) self.branch7x7dbl_5 = conv_block(c7, 192, kernel_size=(1, 7), padding=(0, 3)) self.branch_pool = conv_block(in_channels, 192, kernel_size=1) def _forward(self, x): branch1x1 = self.branch1x1(x) branch7x7 = self.branch7x7_1(x) branch7x7 = self.branch7x7_2(branch7x7) branch7x7 = self.branch7x7_3(branch7x7) branch7x7dbl = self.branch7x7dbl_1(x) branch7x7dbl = self.branch7x7dbl_2(branch7x7dbl) branch7x7dbl = self.branch7x7dbl_3(branch7x7dbl) branch7x7dbl = self.branch7x7dbl_4(branch7x7dbl) branch7x7dbl = self.branch7x7dbl_5(branch7x7dbl) branch_pool = nn.pool(x, kernel_size=3, op='''mean''', stride=1, padding=1) branch_pool = self.branch_pool(branch_pool) outputs = [branch1x1, branch7x7, branch7x7dbl, branch_pool] return outputs def execute(self, x): outputs = self._forward(x) return jt.concat(outputs, dim=1) class InceptionD(nn.Module): def __init__(self, in_channels, conv_block=None): super(InceptionD, self).__init__() if (conv_block is None): conv_block = BasicConv2d self.branch3x3_1 = conv_block(in_channels, 192, kernel_size=1) self.branch3x3_2 = conv_block(192, 320, kernel_size=3, stride=2) self.branch7x7x3_1 = conv_block(in_channels, 192, kernel_size=1) self.branch7x7x3_2 = conv_block(192, 192, kernel_size=(1, 7), padding=(0, 3)) self.branch7x7x3_3 = conv_block(192, 192, kernel_size=(7, 1), padding=(3, 0)) self.branch7x7x3_4 = conv_block(192, 192, kernel_size=3, stride=2) def _forward(self, x): branch3x3 = self.branch3x3_1(x) branch3x3 = self.branch3x3_2(branch3x3) branch7x7x3 = self.branch7x7x3_1(x) branch7x7x3 = self.branch7x7x3_2(branch7x7x3) branch7x7x3 = self.branch7x7x3_3(branch7x7x3) branch7x7x3 = self.branch7x7x3_4(branch7x7x3) branch_pool = nn.pool(x, kernel_size=3, op="maximum", stride=2) outputs = [branch3x3, branch7x7x3, branch_pool] return outputs def execute(self, x): outputs = self._forward(x) return jt.concat(outputs, dim=1) class InceptionE(nn.Module): def __init__(self, in_channels, conv_block=None): super(InceptionE, self).__init__() if (conv_block is None): conv_block = BasicConv2d self.branch1x1 = conv_block(in_channels, 320, kernel_size=1) self.branch3x3_1 = conv_block(in_channels, 384, kernel_size=1) self.branch3x3_2a = conv_block(384, 384, kernel_size=(1, 3), padding=(0, 1)) self.branch3x3_2b = conv_block(384, 384, kernel_size=(3, 1), padding=(1, 0)) self.branch3x3dbl_1 = conv_block(in_channels, 448, kernel_size=1) self.branch3x3dbl_2 = conv_block(448, 384, kernel_size=3, padding=1) self.branch3x3dbl_3a = conv_block(384, 384, kernel_size=(1, 3), padding=(0, 1)) self.branch3x3dbl_3b = conv_block(384, 384, kernel_size=(3, 1), padding=(1, 0)) self.branch_pool = conv_block(in_channels, 192, kernel_size=1) def _forward(self, x): branch1x1 = self.branch1x1(x) branch3x3 = self.branch3x3_1(x) branch3x3 = [self.branch3x3_2a(branch3x3), self.branch3x3_2b(branch3x3)] branch3x3 = jt.concat(branch3x3, dim=1) branch3x3dbl = self.branch3x3dbl_1(x) branch3x3dbl = self.branch3x3dbl_2(branch3x3dbl) branch3x3dbl = [self.branch3x3dbl_3a(branch3x3dbl), self.branch3x3dbl_3b(branch3x3dbl)] branch3x3dbl = jt.concat(branch3x3dbl, dim=1) branch_pool = nn.pool(x, kernel_size=3, op="mean", stride=1, padding=1) branch_pool = self.branch_pool(branch_pool) outputs = [branch1x1, branch3x3, branch3x3dbl, branch_pool] return outputs def execute(self, x): outputs = self._forward(x) return jt.concat(outputs, dim=1) class InceptionAux(nn.Module): def __init__(self, in_channels, num_classes, conv_block=None): super(InceptionAux, self).__init__() if (conv_block is None): conv_block = BasicConv2d self.conv0 = conv_block(in_channels, 128, kernel_size=1) self.conv1 = conv_block(128, 768, kernel_size=5) self.conv1.stddev = 0.01 self.fc = nn.Linear(768, num_classes) self.fc.stddev = 0.001 def execute(self, x): x = nn.pool(x, kernel_size=5, op="mean", stride=3) x = self.conv0(x) x = self.conv1(x) x = nn.AdaptiveAvgPool2d(1)(x) x = jt.reshape(x, (x.shape[0], (- 1))) x = self.fc(x) return x class BasicConv2d(nn.Module): def __init__(self, in_channels, out_channels, **kwargs): super(BasicConv2d, self).__init__() self.conv = nn.Conv(in_channels, out_channels, bias=False, **kwargs) self.bn = nn.BatchNorm(out_channels, eps=0.001) def execute(self, x): x = self.conv(x) x = self.bn(x) return nn.relu(x)