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Code for 1st place solution in Kaggle RSNA Pneumonia Detection Challenge.
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README.md

Installation

All requirements should be detailed in requirements.txt. We strongly recommend using Anaconda (Python 2.7). For example:

conda create -n kaggle-rsna18 python=2.7 pip
pip install -r requirements.txt

We used CUDA 8.0/cuDNN v6.0. You may need to change the TensorFlow version for different versions of CUDA/cuDNN. Please use Keras 2.2.0.

We will refer to the top-level directory as $TOP.

Keras

We encountered the following error using Keras 2.2.0. TypeError: softmax() got an unexpected keyword argument 'axis'

This can be fixed by editing keras/backend/tensorflow_backend.py in your Python packages. Look for tf.nn.softmax(x, axis=axis) and remove the axis argument.

MXNet

Deformable R-FCN/relation networks run with the MXNet backend. Please install the version corresponding to your CUDA version. We used pip install mxnet-cu80==1.3.0.

Keras-RetinaNet

To install keras-retinanet: cd $TOP/models/RetinaNet/ ; pip install .

If you are still having issues importing from keras-retinanet, try export PYTHONPATH="${PYTHONPATH}:$TOP/models/RetinaNet/" with the absolute file path.

Data

We strongly recommend sticking with the directories specified in SETTINGS.json. There is no guarantee that the code will work as intended if changes are made. We will provide instructions for training and testing on the challenge data.

In $TOP, run the following commands:

mkdir data ; cd data 
# Download the challenge data here 
kaggle competitions download -c rsna-pneumonia-detection-challenge
unzip stage_2_detailed_class_info.csv.zip 
unzip stage_2_train_labels.csv.zip 
mv stage_2_detailed_class_info.csv detailed_class_info.csv 
mv stage_2_train_labels.csv train_labels.csv 
mkdir train_dicoms test_dicoms 
cd train_dicoms ; unzip ../stage_2_train_images.zip 
cd ../test_dicoms ; unzip ../stage_2_test_images.zip 

Go back to $TOP. We trained our models on the stage 1 training data and did NOT retrain on stage 2 training data. Thus to reproduce our methodology we recommend running:

python src/etl/0_Stage1Filter.py

This will filter out the stage 1 training data. Then, run the following script to get all the data into the necessary formats.

sh prepare_data.sh

Training

In $TOP/.keras/keras.json you will find the Keras configuration we used to train some of our models. We adapted the Keras code for existing model architectures to accept grayscale (1-channel) input. You can find this code in src/grayscale-models/.

To train all models in the ensemble:

sh train.sh

Comment out lines if you only wish to train specific models.

Trained Models

To download the trained models we used for the challenge, use:

wget --no-check-certificate \
                         -r \
'https://docs.google.com/uc?export=download&id=12abFXy7-FOwoKxFSJ__IbOGm9oQDU7CQ' \
-O models.tar.gz

You can delete the existing models/ directory and replace it with this one. It contains all of the code in addition to the model weights and pretrained models (see below). The file is 22 GB so the download may take a while.

Pretrained Models

We pretrained InceptionResNetV2, Xception, and DenseNet169 on the NIH ChestXray14 dataset. The training code for the classification ensemble depends on the existence of the pretrained models. You can download them via the following command:

wget --no-check-certificate \
                         -r \
'https://docs.google.com/uc?export=download&id=1rI_WSlot6ZNa_ERdLSCsGquUXEK_ikYb' \
-O pretrained.zip

Unzip them into models/pretrained.

Multiple GPUs

Please see the training scripts and modify CUDA_VISIBLE_DEVICES.

For deformable R-FCN/relation networks, you will need to edit the gpus option of the YAML config files located in:

$TOP/models/<DeformableConvNets|RelationNetworks>/skpeep/<unfreeze|default>/cfgs

Note that there is a separate YAML config file for each training fold, and the gpus option must be changed in each one. For training on multiple GPUs, follow this format: gpus: '0,1,2'.

Model Checkpoints

After training the classifier ensemble, you will have to move 1 model checkpoint per fold into a new folder, depending on which checkpoint you have selected (we used highest AUC+F1).

Model checkpoints will be saved in $TOP/models/classifiers/snapshots/<binary|multiclass>. Create the following directories:

mkdir $TOP/models/classifiers/binary $TOP/models/classifiers/multiclass/

For each fold, you will need to select a model checkpoint and move it to $TOP/models/classifiers/<binary|multiclass>.

For example:

mv $TOP/models/classifiers/snapshots/binary/InceptionResNetV2/fold0/weights/weights_subepoch_005.h5 $TOP/models/classifiers/binary/InceptionResNetV2_Fold0Px256_e005.h5

Please follow this file name format because the inference code depends on it. Make sure you include the exact model architecture name, fold, image resolution, and a suffix for the epoch you used. Note that model checkpoints are saved within classifiers/snapshots but final checkpoints should be stored in classifiers. There are also separate folders for binary versus multiclass and it's important to retain this distinction.

For RetinaNet models, model checkpoints will be stored within $TOP/models/RetinaNet/output/<cloud|skippy>/fold[0-9]_384/. Once you have selected your preferred checkpoint, please store it in $TOP/models/RetinaNet/output/<cloud|skippy>/fold[0-9]_384_<resnet101|resnet152>_csv_<epochNum>.h5, which is one directory above where checkpoints were originally saved.

For deformable R-FCN/relation networks, you do not need to do anything to the model checkpoints. We just used the final checkpoint. The inference code depends on the checkpoint being saved in its original location.

Inference

sh predict.sh

This should produce predictions for the test data in $TOP/FinalSubmission.csv.

Simple Model

This code will train 1 InceptionResNetV2 classifier at 256x256px and 5 deformable relation networks. This model achieved 0.253 on stage 2 private LB.

sh train_simple.sh

In this case, the model checkpoints will be saved in $TOP/models/one_classifier/snapshots/binary/InceptionResNetV2/fold0/weights/. You will need to move your selected checkpoint to $TOP/models/one_classifier/binary/.

sh predict_simple.sh

Acknowledgements

We used code from the following repositories:

https://github.com/msracver/Deformable-ConvNets

https://github.com/msracver/Relation-Networks-for-Object-Detection

https://github.com/fizyr/keras-retinanet

https://github.com/ahrnbom/ensemble-objdet

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