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densenet-pytorch-0.2.0
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تبلیغات ما
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مشاهده بیشترتوضیحات
Restore the official code 100% and improve it to make it easier to research and facilitate production.
| ویژگی | مقدار |
|---|---|
| سیستم عامل | - |
| نام فایل | densenet-pytorch-0.2.0 |
| نام | densenet-pytorch |
| نسخه کتابخانه | 0.2.0 |
| نگهدارنده | [] |
| ایمیل نگهدارنده | [] |
| نویسنده | Liu Changyu |
| ایمیل نویسنده | liuchangyu1111@gmail.com |
| آدرس صفحه اصلی | https://github.com/Lornatang/DenseNet-PyTorch |
| آدرس اینترنتی | https://pypi.org/project/densenet-pytorch/ |
| مجوز | Apache |
# DenseNet-PyTorch
`Note: Now supports the more efficient DenseNet-BC (DenseNet-Bottleneck-Compressed) networks. Using the DenseNet-BC-190-40 model, it obtaines state of the art performance on CIFAR-10 and CIFAR-100.`
### Update (Feb 18, 2020)
The update is for ease of use and deployment.
* [Example: Export to ONNX](#example-export-to-onnx)
* [Example: Extract features](#example-feature-extraction)
* [Example: Visual](#example-visual)
It is also now incredibly simple to load a pretrained model with a new number of classes for transfer learning:
```python
from densenet_pytorch import DenseNet
model = DenseNet.from_pretrained('densenet121', num_classes=10)
```
### Update (January 15, 2020)
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.
### Update (January 6, 2020)
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.
### Overview
This repository contains an op-for-op PyTorch reimplementation of [Densely Connected Convolutional Networks](https://arxiv.org/pdf/1608.06993.pdf).
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 DenseNet models
* Use DenseNet models for classification or feature extraction
_Upcoming features_: In the next few days, you will be able to:
* Quickly finetune an DenseNet on your own dataset
* Export DenseNet models for production
### Table of contents
1. [About DenseNet](#about-densenet)
2. [Installation](#installation)
3. [Usage](#usage)
* [Load pretrained models](#loading-pretrained-models)
* [Example: Classify](#example-classification)
* [Example: Extract features](#example-feature-extraction)
* [Example: Export to ONNX](#example-export-to-onnx)
* [Example: Visual](#example-visual)
4. [Contributing](#contributing)
### About DenseNet
If you're new to DenseNets, here is an explanation straight from the official PyTorch implementation:
Dense Convolutional Network (DenseNet), connects each layer to every other layer in a feed-forward fashion. Whereas traditional convolutional networks with L layers have L connections - one between each layer and its subsequent layer - our network has L(L+1)/2 direct connections. For each layer, the feature-maps of all preceding layers are used as inputs, and its own feature-maps are used as inputs into all subsequent layers. DenseNets have several compelling advantages: they alleviate the vanishing-gradient problem, strengthen feature propagation, encourage feature reuse, and substantially reduce the number of parameters.
### Installation
Install from pypi:
```bash
pip install densenet_pytorch
```
Install from source:
```bash
git clone https://github.com/Lornatang/DenseNet-PyTorch
cd DenseNet-PyTorch
pip install -e .
```
### Usage
#### Loading pretrained models
Load an densenet121 network:
```python
from densenet_pytorch import DenseNet
model = DenseNet.from_name("densenet121")
```
Load a pretrained densenet11:
```python
from densenet_pytorch import DenseNet
model = DenseNet.from_pretrained("densenet121")
```
Their 1-crop error rates on imagenet dataset with pretrained models are listed below.
| Model structure | Top-1 error | Top-5 error |
| --------------- | ----------- | ----------- |
| densenet121 | 25.35 | 7.83 |
| densenet169 | 24.00 | 7.00 |
| densenet201 | 22.80 | 6.43 |
| densenet161 | 22.35 | 6.20 |
#### Example: Classification
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.
```python
import json
import torch
import torchvision.transforms as transforms
from PIL import Image
from densenet_pytorch import DenseNet
# 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 DenseNet121
model = DenseNet.from_pretrained("densenet121")
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}%)")
```
#### Example: Feature Extraction
You can easily extract features with `model.extract_features`:
```python
import torch
from densenet_pytorch import DenseNet
model = DenseNet.from_pretrained('densenet121')
# ... 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, 1024, 7, 7])
```
#### Example: Export to ONNX
Exporting to ONNX for deploying to production is now simple:
```python
import torch
from densenet_pytorch import DenseNet
model = DenseNet.from_pretrained('densenet121')
dummy_input = torch.randn(16, 3, 224, 224)
torch.onnx.export(model, dummy_input, "demo.onnx", verbose=True)
```
#### Example: Visual
```text
cd $REPO$/framework
sh start.sh
```
Then open the browser and type in the browser address [http://127.0.0.1:10003/](http://127.0.0.1:10003/).
Enjoy it.
#### ImageNet
See `examples/imagenet` for details about evaluating on ImageNet.
For more datasets result. Please see `research/README.md`.
### Contributing
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!
### Credit
#### Densely Connected Convolutional Networks
*Gao Huang, Zhuang Liu, Laurens van der Maaten, Kilian Q. Weinberger*
##### Abstract
Recent work has shown that convolutional networks can be substantially deeper, more accurate,
and efficient to train if they contain shorter connections between layers close to the input
and those close to the output. In this paper, we embrace this observation and introduce the
Dense Convolutional Network (DenseNet), which connects each layer to every other layer in a
feed-forward fashion. Whereas traditional convolutional networks with L layers have L connections
- one between each layer and its subsequent layer - our network has L(L+1)/2 direct connections.
For each layer, the feature-maps of all preceding layers are used as inputs, and its own feature-maps
are used as inputs into all subsequent layers. DenseNets have several compelling advantages: they
alleviate the vanishing-gradient problem, strengthen feature propagation, encourage feature reuse,
and substantially reduce the number of parameters. We evaluate our proposed architecture on four
highly competitive object recognition benchmark tasks (CIFAR-10, CIFAR-100, SVHN, and ImageNet).
DenseNets obtain significant improvements over the state-of-the-art on most of them, whilst requiring
less computation to achieve high performance. Code and pre-trained models are available at this [https URL](https://github.com/liuzhuang13/DenseNet) .
[paper](http://arxiv.org/pdf/1608.06993v5) [code](https://github.com/liuzhuang13/DenseNet)
```text
@article{DenseNet,
title:{Densely Connected Convolutional Networks},
author:{Gao Huang, Zhuang Liu, Laurens van der Maaten, Kilian Q. Weinberger},
journal={cvpr},
year={2016}
}
```
نیازمندی
| مقدار | نام |
|---|---|
| - | torch |
زبان مورد نیاز
| مقدار | نام |
|---|---|
| >=3.6.0 | Python |
نحوه نصب
نصب پکیج whl densenet-pytorch-0.2.0:
pip install densenet-pytorch-0.2.0.whl
نصب پکیج tar.gz densenet-pytorch-0.2.0:
pip install densenet-pytorch-0.2.0.tar.gz