"""
Modified from https://github.com/pytorch/vision/blob/main/torchvision/models/googlenet.py
"""
import warnings
from collections import namedtuple
from typing import Optional, Tuple, List, Callable, Any
import oneflow as flow
import oneflow.nn as nn
import oneflow.nn.functional as F
from oneflow import Tensor
from .utils import load_state_dict_from_url
from .registry import ModelCreator
__all__ = ["GoogLeNet", "googlenet", "GoogLeNetOutputs", "_GoogLeNetOutputs"]
model_urls = {
"googlenet": "https://oneflow-public.oss-cn-beijing.aliyuncs.com/model_zoo/flowvision/classification/Inception/googlenet.zip",
}
GoogLeNetOutputs = namedtuple(
"GoogLeNetOutputs", ["logits", "aux_logits2", "aux_logits1"]
)
GoogLeNetOutputs.__annotations__ = {
"logits": Tensor,
"aux_logits2": Optional[Tensor],
"aux_logits1": Optional[Tensor],
}
# Script annotations failed with _GoogleNetOutputs = namedtuple ...
# _GoogLeNetOutputs set here for backwards compat
_GoogLeNetOutputs = GoogLeNetOutputs
[docs]@ModelCreator.register_model
def googlenet(
pretrained: bool = False, progress: bool = True, **kwargs: Any
) -> "GoogLeNet":
"""
Constructs the GoogLeNet (Inception v1) model.
.. note::
GoogLeNet (Inception v1) model from the `Going Deeper with Convolutions <http://arxiv.org/abs/1409.4842>`_ paper.
The required minimum input size of the model is 15x15.
Args:
pretrained (bool): Whether to download the pre-trained model on ImageNet. Default: ``False``
progress (bool): If True, displays a progress bar of the download to stderr. Default: ``True``
aux_logits (bool): If True, adds two auxiliary branches that can improve training.
Default: ``False`` when pretrained is True otherwise ``True``
transform_input (bool): If True, preprocesses the input according to the method with which it
was trained on ImageNet. Default: ``False``
For example:
.. code-block:: python
>>> import flowvision
>>> googlenet = flowvision.models.googlenet(pretrained=False, progress=True)
"""
if pretrained:
if "transform_input" not in kwargs:
kwargs["transform_input"] = True
if "aux_logits" not in kwargs:
kwargs["aux_logits"] = False
if kwargs["aux_logits"]:
warnings.warn(
"auxiliary heads in the pretrained googlenet model are NOT pretrained, "
"so make sure to train them"
)
original_aux_logits = kwargs["aux_logits"]
kwargs["aux_logits"] = True
model = GoogLeNet(**kwargs)
state_dict = load_state_dict_from_url(
model_urls["googlenet"], progress=progress
)
model.load_state_dict(state_dict)
if not original_aux_logits:
model.aux_logits = False
model.aux1 = None # type: ignore[assignment]
model.aux2 = None # type: ignore[assignment]
return model
return GoogLeNet(**kwargs)
class GoogLeNet(nn.Module):
__constants__ = ["aux_logits", "transform_input"]
def __init__(
self,
num_classes: int = 1000,
aux_logits: bool = True,
transform_input: bool = False,
init_weights: Optional[bool] = None,
blocks: Optional[List[Callable[..., nn.Module]]] = None,
) -> None:
super(GoogLeNet, self).__init__()
if blocks is None:
blocks = [BasicConv2d, Inception, InceptionAux]
if init_weights is None:
init_weights = True
assert len(blocks) == 3
conv_block = blocks[0]
inception_block = blocks[1]
inception_aux_block = blocks[2]
self.aux_logits = aux_logits
self.transform_input = transform_input
self.conv1 = conv_block(3, 64, kernel_size=7, stride=2, padding=3)
self.maxpool1 = nn.MaxPool2d(3, stride=2, ceil_mode=True)
self.conv2 = conv_block(64, 64, kernel_size=1)
self.conv3 = conv_block(64, 192, kernel_size=3, padding=1)
self.maxpool2 = nn.MaxPool2d(3, stride=2, ceil_mode=True)
self.inception3a = inception_block(192, 64, 96, 128, 16, 32, 32)
self.inception3b = inception_block(256, 128, 128, 192, 32, 96, 64)
self.maxpool3 = nn.MaxPool2d(3, stride=2, ceil_mode=True)
self.inception4a = inception_block(480, 192, 96, 208, 16, 48, 64)
self.inception4b = inception_block(512, 160, 112, 224, 24, 64, 64)
self.inception4c = inception_block(512, 128, 128, 256, 24, 64, 64)
self.inception4d = inception_block(512, 112, 144, 288, 32, 64, 64)
self.inception4e = inception_block(528, 256, 160, 320, 32, 128, 128)
self.maxpool4 = nn.MaxPool2d(2, stride=2, ceil_mode=True)
self.inception5a = inception_block(832, 256, 160, 320, 32, 128, 128)
self.inception5b = inception_block(832, 384, 192, 384, 48, 128, 128)
if aux_logits:
self.aux1 = inception_aux_block(512, num_classes)
self.aux2 = inception_aux_block(528, num_classes)
else:
self.aux1 = None # type: ignore[assignment]
self.aux2 = None # type: ignore[assignment]
self.avgpool = nn.AdaptiveAvgPool2d((1, 1))
self.dropout = nn.Dropout(0.2)
self.fc = nn.Linear(1024, num_classes)
if init_weights:
self._initialize_weights()
def _initialize_weights(self) -> None:
for m in self.modules():
if isinstance(m, nn.Conv2d) or isinstance(m, nn.Linear):
import scipy.stats as stats
X = stats.truncnorm(-2, 2, scale=0.01)
values = flow.as_tensor(X.rvs(m.weight.numel()), dtype=m.weight.dtype)
values = values.view(m.weight.size())
with flow.no_grad():
m.weight.copy_(values)
elif isinstance(m, nn.BatchNorm2d):
nn.init.constant_(m.weight, 1)
nn.init.constant_(m.bias, 0)
def _transform_input(self, x: Tensor) -> Tensor:
if self.transform_input:
x_ch0 = flow.unsqueeze(x[:, 0], 1) * (0.229 / 0.5) + (0.485 - 0.5) / 0.5
x_ch1 = flow.unsqueeze(x[:, 1], 1) * (0.224 / 0.5) + (0.456 - 0.5) / 0.5
x_ch2 = flow.unsqueeze(x[:, 2], 1) * (0.225 / 0.5) + (0.406 - 0.5) / 0.5
x = flow.cat((x_ch0, x_ch1, x_ch2), 1)
return x
def forward(self, x: Tensor) -> Tuple[Tensor, Optional[Tensor], Optional[Tensor]]:
x = self._transform_input(x)
# N x 3 x 224 x 224
x = self.conv1(x)
# N x 64 x 112 x 112
x = self.maxpool1(x)
# N x 64 x 56 x 56
x = self.conv2(x)
# N x 64 x 56 x 56
x = self.conv3(x)
# N x 192 x 56 x 56
x = self.maxpool2(x)
# N x 192 x 28 x 28
x = self.inception3a(x)
# N x 256 x 28 x 28
x = self.inception3b(x)
# N x 480 x 28 x 28
x = self.maxpool3(x)
# N x 480 x 14 x 14
x = self.inception4a(x)
# N x 512 x 14 x 14
aux1: Optional[Tensor] = None
if self.aux1 is not None:
if self.training:
aux1 = self.aux1(x)
x = self.inception4b(x)
# N x 512 x 14 x 14
x = self.inception4c(x)
# N x 512 x 14 x 14
x = self.inception4d(x)
# N x 528 x 14 x 14
aux2: Optional[Tensor] = None
if self.aux2 is not None:
if self.training:
aux2 = self.aux2(x)
x = self.inception4e(x)
# N x 832 x 14 x 14
x = self.maxpool4(x)
# N x 832 x 7 x 7
x = self.inception5a(x)
# N x 832 x 7 x 7
x = self.inception5b(x)
# N x 1024 x 7 x 7
x = self.avgpool(x)
# N x 1024 x 1 x 1
x = flow.flatten(x, 1)
# N x 1024
x = self.dropout(x)
x = self.fc(x)
# N x 1000 (num_classes)
return x, aux2, aux1
class Inception(nn.Module):
def __init__(
self,
in_channels: int,
ch1x1: int,
ch3x3red: int,
ch3x3: int,
ch5x5red: int,
ch5x5: int,
pool_proj: int,
conv_block: Optional[Callable[..., nn.Module]] = None,
) -> None:
super(Inception, self).__init__()
if conv_block is None:
conv_block = BasicConv2d
self.branch1 = conv_block(in_channels, ch1x1, kernel_size=1)
self.branch2 = nn.Sequential(
conv_block(in_channels, ch3x3red, kernel_size=1),
conv_block(ch3x3red, ch3x3, kernel_size=3, padding=1),
)
self.branch3 = nn.Sequential(
conv_block(in_channels, ch5x5red, kernel_size=1),
# Here, kernel_size=3 instead of kernel_size=5 is a known bug.
conv_block(ch5x5red, ch5x5, kernel_size=3, padding=1),
)
self.branch4 = nn.Sequential(
nn.MaxPool2d(kernel_size=3, stride=1, padding=1, ceil_mode=True),
conv_block(in_channels, pool_proj, kernel_size=1),
)
def _forward(self, x: Tensor) -> List[Tensor]:
branch1 = self.branch1(x)
branch2 = self.branch2(x)
branch3 = self.branch3(x)
branch4 = self.branch4(x)
outputs = [branch1, branch2, branch3, branch4]
return outputs
def forward(self, x: Tensor) -> Tensor:
outputs = self._forward(x)
return flow.cat(outputs, 1)
class InceptionAux(nn.Module):
def __init__(
self,
in_channels: int,
num_classes: int,
conv_block: Optional[Callable[..., nn.Module]] = None,
) -> None:
super(InceptionAux, self).__init__()
if conv_block is None:
conv_block = BasicConv2d
self.conv = conv_block(in_channels, 128, kernel_size=1)
self.fc1 = nn.Linear(2048, 1024)
self.fc2 = nn.Linear(1024, num_classes)
def forward(self, x: Tensor) -> Tensor:
# aux1: N x 512 x 14 x 14, aux2: N x 528 x 14 x 14
x = F.adaptive_avg_pool2d(x, (4, 4))
# aux1: N x 512 x 4 x 4, aux2: N x 528 x 4 x 4
x = self.conv(x)
# N x 128 x 4 x 4
x = flow.flatten(x, 1)
# N x 2048
x = F.relu(self.fc1(x), inplace=True)
# N x 1024
x = F.dropout(x, 0.7, training=self.training)
# N x 1024
x = self.fc2(x)
# N x 1000 (num_classes)
return x
class BasicConv2d(nn.Module):
def __init__(self, in_channels: int, out_channels: int, **kwargs: Any) -> None:
super(BasicConv2d, self).__init__()
self.conv = nn.Conv2d(in_channels, out_channels, bias=False, **kwargs)
self.bn = nn.BatchNorm2d(out_channels, eps=0.001)
def forward(self, x: Tensor) -> Tensor:
x = self.conv(x)
x = self.bn(x)
return F.relu(x, inplace=True)