The project provides tools for training and applying Deep Learning models of U-Net like architecture for semantic segmentation of microscopy images of ablation marks after MALDI imaging mass spectrometry. The models are based on TernausNet and segmentation_models.pytorch.
Segmentation results:
pip install -r requirements.txt
Create a config file and input your AWS IAM user credentials and your name. Your AWS IAM user should be in the am-segm-users group.
copy config/config.yml.template config/config.yml
Download and unpack the sample dataset
mkdir -p data/getting-started
cd data/getting-started
wget https://am-segm.s3-eu-west-1.amazonaws.com/getting-started/training-data.zip
unzip training-data.zip
https://am-segm.s3-eu-west-1.amazonaws.com/getting-started/dataset.zip
unzip dataset.zip
Train a model, specify the matrix used during MALDI acquisition. The model will be stored at your personal path in the project bucket, s3://am-segm/<user>. Model training information will be downloaded to the ./model directory.
python scripts/train.py data/getting-started/training-data --matrix DHB
Use the trained model to segment the whole dataset, --no-register is used to skip the last ablation marks registration step
python scripts/inference.py data/getting-started/dataset/Luca_Well4_UL --no-register
Run ablation marks registration script. Based on the ablation marks segmentation mask, the script will assign ids in row-wise manner to all ablation marks, starting with 1 at the top left corner. The acquisition grid size (rows x cols) needs to be provided
python scripts/register_ams.py data/getting-started/dataset/Luca_Well4_UL --rows 60 --cols 60
The model training is done on a wide range of different images obtained from microscopy of samples after acquisition with MALDI imaging mass spectrometry.
Sample data can be downloaded from AWS S3 using
wget https://am-segm.s3-eu-west-1.amazonaws.com/post-MALDI-IMS-microscopy.tar.gz
It is important to notice that usually these microscopy images are quite large, e.g. 5000x5000 pixels. As most of the segmentation networks are not designed for images of such resolution, additional steps for image slicing and stitching have to be added to the pipeline.
source- dataset input imagesWell4_UL- dataset group, dataset has >=1 groups with one image per group
source_norm- intensity normalized imagestiles- input images split into tiles for parallel segmentationWell4_UL/source- input tilesWell4_UL/mask- predicted masks
tiles_stitched- stitched images, masks and their overlaysam_coords- final output, label encoded segmentation mask, each ablation mark has its own id
$ tree -d data/getting-started/dataset
data/getting-started/dataset
└── Luca_Well4_UL
├── am_coords
│ └── Well4_UL
├── source
│ └── Well4_UL
├── source_norm
│ └── Well4_UL
├── tiles
│ └── Well4_UL
│ ├── mask
│ └── source
└── tiles_stitched
└── Well4_UL
The top level directory has subdirectories with training and validation data accordingly
train,valid- data typeLuca_Well4_UL- dataset nameWell4_UL- dataset group name
$ tree -d data/getting-started/training-data
data/getting-started/training-data
├── train
│ └── Luca_Well4_UL
│ └── Well4_UL
│ ├── mask
│ └── source
└── valid
└── Luca_Well4_UL
└── Well4_UL
├── mask
└── source
The best performing model turned to be U-net with ResNeXt-50 (32x4d) as encoder from segmentation_models.pytorch by Pavel Yakubovskiy
Add AWS IAM user credentials into the boto3 config
# ~/.aws/credentials
[am-segm]
aws_access_key_id = <user-key-id>
aws_secret_access_key = <user-secret-key>
Build a Docker image for training with AWS SageMaker
./build-and-push.sh train
The script for training a dataset optimized model
$ python scripts/train.py -h
usage: train.py [-h] --matrix MATRIX [--local] fine_tuning_path
Train AM segmentation model with SageMaker
positional arguments:
fine_tuning_path Path to fine tuning data
optional arguments:
-h, --help show this help message and exit
--matrix MATRIX 'DHB' or 'DAN'
--local Run training locally
As original data usually does not come with masks, a semi-supervised approach for getting image masks is used.
- Fist a few small areas of the input image are selected and manually segmented
- Simple and fast model with lots of regularisation to prevent overfitting is trained
- The trained model is used to predict full mask for the image
- The full mask for multiple images already can be used for more intensive training of a bigger model
To explore the model training Jupyter notebook:
- Spin up Jupyter server and open
pytorch-unet.ipynbnotebook
Add AWS IAM user credentials into the boto3 config
# ~/.aws/credentials
[am-segm]
aws_access_key_id = <user-key-id>
aws_secret_access_key = <user-secret-key>
Build a Docker image for inference (prediction) with AWS ECS
./build-and-push.sh predict
The script for dataset segmentation
$ python scripts/inference.py -h
usage: inference.py [-h] [--tile-size TILE_SIZE] [--rows ROWS] [--cols COLS] [--debug] [--no-register] ds_path [groups [groups ...]]
Run AM segmentation pipeline
positional arguments:
ds_path Dataset directory path
groups
optional arguments:
-h, --help show this help message and exit
--tile-size TILE_SIZE
--rows ROWS
--cols COLS
--debug
--no-register
- Build image and start container
docker build -t am-segm/ecs-pytorch-predict -f ecs/Dockerfile .
docker run -p 8000:8000 --name am-segm --rm am-segm
- Submit a segmentation task
http POST localhost:8000/tasks Content-Type:image/png < api-use/source_small.png
HTTP/1.0 201 Created
Date: Mon, 07 Jan 2019 22:48:58 GMT
Server: WSGIServer/0.2 CPython/3.7.2
content-length: 0
content-type: application/json; charset=UTF-8
location: /tasks/c0bfec01-a8a4-431b-8d3d-56e43708c877
- Check task status
http localhost:8000/tasks/c0bfec01-a8a4-431b-8d3d-56e43708c877
HTTP/1.0 200 OK
Date: Mon, 07 Jan 2019 22:49:51 GMT
Server: WSGIServer/0.2 CPython/3.7.2
content-length: 20
content-type: application/json; charset=UTF-8
{
"status": "QUEUED"
}
- Once status is "FINISHED", get predicted mask
http localhost:8000/masks/c0bfec01-a8a4-431b-8d3d-56e43708c877
HTTP/1.0 200 OK
Date: Mon, 07 Jan 2019 22:52:30 GMT
Server: WSGIServer/0.2 CPython/3.7.2
content-length: 171167
content-type: image/png
+-----------------------------------------+
| NOTE: binary data not shown in terminal |
+-----------------------------------------+
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