Kaggle Humpback Whale Identification Challenge 2019 2nd place code

Kaggle_Whale2019_2nd_palce_solution

Kaggle Humpback Whale Identification Challenge 2019 2nd place code

This is the source code for my part of the 2nd place solution to the Humpback Whale Identification Challenge hosted by Kaggle.com.

Dependencies

• imgaug == 0.2.8
• opencv-python==3.4.2
• scikit-image==0.14.0
• scikit-learn==0.19.1
• scipy==1.1.0
• torch==1.0.1.
• torchvision==0.2.2

Solution Development

single model design

• Input: 256x512 or 512*512 cropped images;
• Backbone: resnet101, seresnet101, seresnext101;
• Loss function: arcface loss + triplet loss + focal loss;
• optimizer: adam with warm up lr strategy；
• Augmentation: blur,grayscale,noise,shear,rotate,perspective transform；
• Horizontal flip to create more ids -> 5004*2
• Pseudo Labeling

Single model performace

Single model performace with pseudo labeling

I generate a pseudo label list containing 1.5k samples when I reached 0.940 in public LB, and I kept using this list till the competition ended. I used the bottleneck feature of the arcface model (my baseline model) to calculate cosine distance of train test images. For those few shot classes (less than 2 samples), I choose 0.65 as the threshold to filter high confidence samples. I think it will be better result using 0.970 LB model to find pseudo label.

Model ensemble performace

Path Setup

Set the following path to your own in ./process/data_helper.py

PJ_DIR = r'/Kaggle_Whale2019_2nd_place_solution'#project path
train_df = pd.read_csv('train.csv') #train.csv path
TRN_IMGS_DIR = '/train/'#train data path
TST_IMGS_DIR = '/test/' #test data path

Single Model Training

train resnet101 256x512 fold 0：

CUDA_VISIBLE_DEVICES=0,1,2,3 python main.py --mode=train --model=resnet101 --image_h=256 --image_w=512 --fold_index=0 --batch_size=128

train resnet101 512x512 fold 0：

CUDA_VISIBLE_DEVICES=0,1,2,3 python main.py --mode=train --model=resnet101 --image_h=512 --image_w=512 --fold_index=0 --batch_size=128

predict resnet101 256x512 fold 0 model：

CUDA_VISIBLE_DEVICES=0,1,2,3 python main.py --mode=test --model=resnet101 --image_h=256 --image_w=512 --fold_index=0 --batch_size=128 --pretrained_mode=max_valid_model.pth

train resnet101 256x512 fold 0 with pseudo labeling：

CUDA_VISIBLE_DEVICES=0,1,2,3 python main.py --mode=train --model=resnet101 --image_h=256 --image_w=512 --fold_index=0 --batch_size=128 --is_pseudo=True

predict resnet101 256x512 fold 0 model with pseudo labeling：

CUDA_VISIBLE_DEVICES=0,1,2,3 python main.py --mode=test --model=resnet101 --image_h=256 --image_w=512 --fold_index=0 --batch_size=128 --is_pseudo=True --pretrained_mode=max_valid_model.pth

Final Ensemble

the final submission is the weight average result of 10 ckpts

python ensemble.py

GitHub