July 11, 2020
- We reimplemented assemble-resnet with tensorflow 2.1. If you want to see the code with better readability, refer to this branch.
Official Tensorflow implementation
Jungkyu Lee, Taeryun Won, Tae Kwan Lee, Hyemin Lee, Geonmo Gu, Kiho Hong
@NAVER/LINE Vision
Abstract
Recent studies in image classification have demonstrated a variety of techniques for improving the performance of Convolutional Neural Networks (CNNs). However, attempts to combine existing techniques to create a practical model are still uncommon. In this study, we carry out extensive experiments to validate that carefully assembling these techniques and applying them to basic CNN models (e.g., ResNet and MobileNet) can improve the accuracy and robustness of the models while minimizing the loss of throughput. Our proposed assembled ResNet-50 shows improvements in top-1 accuracy from 76.3% to 82.78%, mCE from 76.0% to 48.9% and mFR from 57.7% to 32.3% on ILSVRC2012 validation set. With these improvements, inference throughput only decreases from 536 to 312. To verify the performance improvement in transfer learning, fine grained classification and image retrieval tasks were tested on several public datasets and showed that the improvement to backbone network performance boosted transfer learning performance significantly. Our approach achieved 1st place in the iFood Competition Fine-Grained Visual Recognition at CVPR 2019
- Based on our repository, we achieved 1st place in iFood Competition Fine-Grained Visual Recognition at CVPR 2019.
Thankfully some people have written testimonial and posts related to our paper.
- Jeremy Howard's testimonial tweet
- Stan Kriventsov's summary post
- akira's summary post
- norman3(one of authurs)'s korean version paper
As first try, you can fine-tune your flower classifier in colab.
- This work was tested with Tensorflow 1.14.0, CUDA 10.0, python 3.6.
pip install Pillow sklearn requests Wand tqdmWe assume you already have the following data:
- ImageNet2012 raw images and tfrecord. For this data, please refer to here
- For knowledge distillation, you need to add the teacher's logits to the TFRecord according to here
- For transfer learing datasets, refer to scripts in here
- To download pretrained model, visit here
- To make mCE evaluation dataset. refer to here
First, download pretrained models from here.
For Assemble-ResNet50,
DATA_DIR=/path/to/imagenet2012/tfrecord
MODEL_DIR=/path/Assemble-ResNet50/checkpoint
CUDA_VISIBLE_DEVICES=1 python main_classification.py \
--eval_only=True \
--dataset_name=imagenet \
--data_dir=${DATA_DIR} \
--model_dir=${MODEL_DIR} \
--preprocessing_type=imagenet_224_256 \
--resnet_version=2 \
--resnet_size=50 \
--use_sk_block=True \
--use_resnet_d==False \
--anti_alias_type=sconv \
--anti_alias_filter_size=3 Note that use_resnet_d==False.
We have implemented BigLittleNet with reference to the official implementation of BigLittleNet
We found that BigLittleNet's official implementation already includes the concept of resnet-d.
that is, in both resnet_d_projection_shortcut and bl_projection_shortcut, a average
pooling layer has been added with a stride of 2 before the convolution(except pooling size is different).
So we described it in the paper as D + BL.
However, when using BL, we did not use tweak that replaces 7x7 convolution with three 3x3 conv(so it become use_resnet_d=False) because it made training unstable.
I thought it was a little tricky. We will further explain it in the v2 version of our paper.
For Assemble-ResNet152,
DATA_DIR=/path/to/imagenet2012/tfrecord
MODEL_DIR=/path/Assemble-ResNet152/checkpoint
CUDA_VISIBLE_DEVICES=1 python main_classification.py \
--eval_only=True \
--dataset_name=imagenet \
--data_dir=${DATA_DIR} \
--model_dir=${MODEL_DIR} \
--preprocessing_type=imagenet_224_256a \
--resnet_version=2 \
--resnet_size=152 \
--bl_alpha=1 \
--bl_beta=2 \
--use_sk_block=True \
--anti_alias_type=sconv \
--anti_alias_filter_size=3 For Assemble-ResNet 152, preprocessing_type=imagenet_224_256a(resize the shorter size of each image to 257 pixels while
the aspect ratio is maintained. Next, we center crop the image to the 256x256 size) performed better.
The expected final output is`
...
| accuracy: 0.841860 |
...
For training parameter information, refer to here
Train vanila ResNet50 on ImageNet from scratch.
$ ./scripts/train_vanila_from_scratch.shTrain all-assemble ResNet50 on ImageNet from scratch.
$ ./scripts/train_assemble_from_scratch.shIn the previous section, you train the pretrained model from scratch. You can also download pretrained model to finetune from here.
Fine-tune vanila ResNet50 on Food101.
$ ./scripts/finetuning_vanila_on_food101.shTrain all-assemble ResNet50 on Food101.
$ ./scripts/finetuning_assemble_on_food101.shYou can calculate mCE on the trained model as follows:
$ ./eval_assemble_mCE_on_imagenet.shThis implementation is based on these repository:
- resnet official: https://github.com/tensorflow/models/tree/master/official/r1/resnet
- mce: https://github.com/hendrycks/robustness
- autoaugment: https://github.com/tensorflow/tpu/blob/master/models/official/efficientnet/autoaugment.py
Feel free to create a issue or contact me if there is any question (Jungkyu Lee jungkyu.lee@navercorp.com).
@misc{lee2020compounding,
title={Compounding the Performance Improvements of Assembled Techniques in a Convolutional Neural Network},
author={Jungkyu Lee, Taeryun Won, Tae Kwan Lee, Hyemin Lee, Geonmo Gu, Kiho Hong},
year={2020},
eprint={2001.06268v2},
archivePrefix={arXiv},
primaryClass={cs.CV}
}
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