Add singularity README.md.

singularity/README.md

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+# Build Singularity Container
+
+This is the procedure we used to build singularity containers. The singularity recipes were generated
+with [neurodocker](https://github.com/ReproNim/neurodocker).
+
+Build Python package:
+`python setup.py bdist_wheel`
+
+Build singularity recipe:
+`neurodocker generate singularity -b nvidia/cuda:10.2-cudnn7-devel-ubuntu18.04 -p apt --copy ./dist/fourier_image_transformers-0.2.0-py3-none-any.whl /fourier_image_transformers-0.2.0-py3-none-any.whl --miniconda create_env=fit conda_install='python=3.7 astra-toolbox pytorch torchvision torchaudio cudatoolkit=10.2 -c pytorch -c astra-toolbox/label/dev' pip_install='/fourier_image_transformers-0.2.0_zero-py3-none-any.whl' activate=true --entrypoint "/neurodocker/startup.sh python" > v0.2.0.Singularity`
+
+Build singularity container:
+`sudo singularity build fit_v0.2.0.simg v0.2.0.Singularity`