The update is for ease of use and deployment.
It is also now incredibly simple to load a pretrained model with a new number of classes for transfer learning:
from vgg_pytorch import VGG
model = VGG.from_pretrained('vgg11', num_classes=10)
This update allows you to use NVIDIA's Apex tool for accelerated training. By default choice hybrid training precision
+ dynamic loss amplified
version, if you need to learn more and details about apex
tools, please visit https://github.com/NVIDIA/apex.
This update adds a visual interface for testing, which is developed by pyqt5. At present, it has realized basic functions, and other functions will be gradually improved in the future.
This update adds a modular neural network, making it more flexible in use. It can be deployed to many common dataset classification tasks. Of course, it can also be used in your products.
This repository contains an op-for-op PyTorch reimplementation of VGGNet.
The goal of this implementation is to be simple, highly extensible, and easy to integrate into your own projects. This implementation is a work in progress -- new features are currently being implemented.
At the moment, you can easily:
- Load pretrained VGGNet models
- Use VGGNet models for classification or feature extraction
Upcoming features: In the next few days, you will be able to:
- Quickly finetune an VGGNet on your own dataset
- Export VGGNet models for production
If you're new to VGGNets, here is an explanation straight from the official PyTorch implementation:
In this work we investigate the effect of the convolutional network depth on its accuracy in the large-scale image recognition setting. Our main contribution is a thorough evaluation of networks of increasing depth using an architecture with very small (3 × 3) convolution filters, which shows that a significant improvement on the prior-art configurations can be achieved by pushing the depth to 16–19 weight layers. These findings were the basis of our ImageNet Challenge 2014 submission, where our team secured the first and the second places in the localisation and classification tracks respectively. We also show that our representations generalise well to other datasets, where they achieve state-of-the-art results. We have made our two best-performing ConvNet models publicly available to facilitate further research on the use of deep visual representations in computer vision.
Install from pypi:
$ pip3 install vgg_pytorch
Install from source:
$ git clone https://github.com/Lornatang/VGGNet-PyTorch.git
$ cd VGGNet-PyTorch
$ pip3 install -e .
Load an vgg11 network:
from vgg_pytorch import VGG
model = VGG.from_name("vgg11")
Load a pretrained vgg11:
from vgg_pytorch import VGG
model = VGG.from_pretrained("vgg11")
Their 1-crop error rates on imagenet dataset with pretrained models are listed below.
Model structure | Top-1 error | Top-5 error |
---|---|---|
vgg11 | 30.98 | 11.37 |
vgg11_bn | 29.70 | 10.19 |
vgg13 | 30.07 | 10.75 |
vgg13_bn | 28.45 | 9.63 |
vgg16 | 28.41 | 9.62 |
vgg16_bn | 26.63 | 8.50 |
vgg19 | 27.62 | 9.12 |
vgg19_bn | 25.76 | 8.15 |
Details about the models are below (for CIFAR10 dataset):
Name | # Params | Top-1 Acc. | Pretrained? |
---|---|---|---|
vgg11 |
132.9M | 91.1 | √ |
vgg13 |
133M | 92.8 | √ |
vgg16 |
138.4M | 92.6 | √ |
vgg19 |
143.7M | 92.3 | √ |
------------------- | ---------- | ------------ | ------------- |
vgg11_bn |
132.9M | 92.2 | √ |
vgg13_bn |
133M | 94.2 | √ |
vgg16_bn |
138.4M | 93.9 | √ |
vgg19_bn |
143.7M | 93.7 | √ |
We assume that in your current directory, there is a img.jpg
file and a labels_map.txt
file (ImageNet class names). These are both included in examples/simple
.
All pre-trained models expect input images normalized in the same way,
i.e. mini-batches of 3-channel RGB images of shape (3 x H x W)
, where H
and W
are expected to be at least 224
.
The images have to be loaded in to a range of [0, 1]
and then normalized using mean = [0.485, 0.456, 0.406]
and std = [0.229, 0.224, 0.225]
.
Here's a sample execution.
import json
import torch
import torchvision.transforms as transforms
from PIL import Image
from vgg_pytorch import VGG
# Open image
input_image = Image.open("img.jpg")
# Preprocess image
preprocess = transforms.Compose([
transforms.Resize(256),
transforms.CenterCrop(224),
transforms.ToTensor(),
transforms.Normalize(mean=[0.485, 0.456, 0.406], std=[0.229, 0.224, 0.225]),
])
input_tensor = preprocess(input_image)
input_batch = input_tensor.unsqueeze(0) # create a mini-batch as expected by the model
# Load class names
labels_map = json.load(open("labels_map.txt"))
labels_map = [labels_map[str(i)] for i in range(1000)]
# Classify with VGG11
model = VGG.from_pretrained("vgg11")
model.eval()
# move the input and model to GPU for speed if available
if torch.cuda.is_available():
input_batch = input_batch.to("cuda")
model.to("cuda")
with torch.no_grad():
logits = model(input_batch)
preds = torch.topk(logits, k=5).indices.squeeze(0).tolist()
print("-----")
for idx in preds:
label = labels_map[idx]
prob = torch.softmax(logits, dim=1)[0, idx].item()
print(f"{label:<75} ({prob * 100:.2f}%)")
You can easily extract features with model.extract_features
:
import torch
from vgg_pytorch import VGG
model = VGG.from_pretrained('vgg11')
# ... image preprocessing as in the classification example ...
inputs = torch.randn(1, 3, 224, 224)
print(inputs.shape) # torch.Size([1, 3, 224, 224])
features = model.extract_features(inputs)
print(features.shape) # torch.Size([1, 512, 7, 7])
Exporting to ONNX for deploying to production is now simple:
import torch
from vgg_pytorch import VGG
model = VGG.from_pretrained('vgg11')
dummy_input = torch.randn(16, 3, 224, 224)
torch.onnx.export(model, dummy_input, "demo.onnx", verbose=True)
cd $REPO$/framework
sh start.sh
Then open the browser and type in the browser address http://127.0.0.1:8000/.
Enjoy it.
See examples/imagenet
for details about evaluating on ImageNet.
For more datasets result. Please see research/README.md
.
If you find a bug, create a GitHub issue, or even better, submit a pull request. Similarly, if you have questions, simply post them as GitHub issues.
I look forward to seeing what the community does with these models!
Karen Simonyan, Andrew Zisserman
In this work we investigate the effect of the convolutional network depth on its accuracy in the large-scale image recognition setting. Our main contribution is a thorough evaluation of networks of increasing depth using an architecture with very small (3x3) convolution filters, which shows that a significant improvement on the prior-art configurations can be achieved by pushing the depth to 16-19 weight layers. These findings were the basis of our ImageNet Challenge 2014 submission, where our team secured the first and the second places in the localisation and classification tracks respectively. We also show that our representations generalise well to other datasets, where they achieve state-of-the-art results. We have made our two best-performing ConvNet models publicly available to facilitate further research on the use of deep visual representations in computer vision.
@article{VGG,
title:{Very Deep Convolutional Networks for Large-Scale Image Recognition},
author:{Karen Simonyan, Andrew Zisserman},
journal={iclr},
year={2015}
}