RAPIDS

Overview

RAPIDS is a suite of open source software libraries from NVIDIA mainly for executing data science and analytics pipelines in Python on GPUs. It relies on NVIDIA CUDA primitives for low-level compute optimization and provides friendly Python APIs, similar to those in Pandas, Scikit-learn, etc.

The main components are:

• cuDF, a Python GPU DataFrame library (built on the Apache Arrow columnar memory format) for loading, joining, aggregating, filtering, and otherwise manipulating data.

• cuML, a suite of libraries that implement machine learning algorithms and mathematical primitive functions that share compatible APIs with other RAPIDS projects.

• cuGraph, a GPU accelerated graph analytics library, with functionality like NetworkX, which is seamlessly integrated into the RAPIDS data science platform.

• Cyber Log Accelerators (CLX or clicks), a collection of RAPIDS examples for security analysts, data scientists, and engineers to quickly get started applying RAPIDS and GPU acceleration to real-world cybersecurity use cases.

• cuxFilter, a connector library, which provides the connections between different visualization libraries and a GPU dataframe without much hassle. This also allows you to use charts from different libraries in a single dashboard, while also providing the interaction.

• cuSpatial, a GPU accelerated C++/Python library for accelerating GIS workflows including point-in-polygon, spatial join, coordinate systems, shape primitives, distances, and trajectory analysis.

• cuSignal, which leverages CuPy, Numba, and the RAPIDS ecosystem for GPU accelerated signal processing. In some cases, cuSignal is a direct port of Scipy Signal to leverage GPU compute resources via CuPy but also contains Numba CUDA kernels for additional speedups for selected functions.

• cuCIM, an extensible toolkit designed to provide GPU accelerated I/O, computer vision & image processing primitives for N-Dimensional images with a focus on biomedical imaging.

• RAPIDS Memory Manager (RMM), a central place for all device memory allocations in cuDF (C++ and Python) and other RAPIDS libraries. In addition, it is a replacement allocator for CUDA Device Memory (and CUDA Managed Memory) and a pool allocator to make CUDA device memory allocation / deallocation faster and asynchronous.

Singularity images

To build a Singularity image for RAPIDS, the first thing to do is to find and select a Docker image provided by NVIDIA.

Finding a Docker image

There are three types of RAPIDS Docker images: base, runtime, and devel. For each type, multiple images are provided for different combinations of RAPIDS and CUDA versions, either on Ubuntu or on CentOS. You can find the Docker pull command for a selected image under the Tags tab on each site.

• NVIDIA GPU Cloud (NGC)
  • base images contain a RAPIDS environment ready for use. Use this type of image if you want to submit a job to the Slurm scheduler.
  • runtime images extend the base image by adding a Jupyter notebook server and example notebooks. Use this type of image if you want to interactively work with RAPIDS through notebooks and examples.
• Docker Hub
  • devel images contain the full RAPIDS source tree, the compiler toolchain, the debugging tools, the headers and the static libraries for RAPIDS development. Use this type of image if you want to implement customized operations with low-level access to cuda-based processes.

Building a Singularity image

For example, if a Docker pull command for a selected image is given as

docker pull nvcr.io/nvidia/rapidsai/rapidsai:cuda11.0-runtime-centos7

on a computer that supports Singularity, you can build a Singularity image (here rapids.sif) with the following command based on the pull tag:

[name@server ~]$ singularity build rapids.sif docker://nvcr.io/nvidia/rapidsai/rapidsai:cuda11.0-runtime-centos7

It usually takes from thirty to sixty minutes to complete the image-building process. Since the image size is relatively large, you need to have enough memory and disk space on the server to build such an image.

Working on clusters with a Singularity image

Once you have a Singularity image for RAPIDS ready in your account, you can request an interactive session on a GPU node or submit a batch job to Slurm if you have your RAPIDS code ready.

Working interactively on a GPU node

If a Singularity image was built based on a runtime or a devel type of Docker image, it includes a Jupyter Notebook server and can be used to explore RAPIDS interactively on a compute node with a GPU.
To request an interactive session on a compute node with a single GPU, e.g. a T4 type of GPU on Graham, run

[name@gra-login ~]$ salloc --ntasks=1 --cpus-per-task=2 --mem=10G --gres=gpu:t4:1 --time=1:0:0 --account=def-someuser

Once the requested resource is granted, start the RAPIDS shell on the GPU node with

[name@gra#### ~]$ module load singularity
[name@gra#### ~]$ singularity shell --nv -B /home -B /project -B /scratch  rapids.sif

• the --nv option binds the GPU driver on the host to the container, so the GPU device can be accessed from inside the Singularity container;
• the -B option binds any filesystem that you would like to access from inside the container.

After the shell prompt changes to Singularity>, you can check the GPU stats in the container to make sure the GPU device is accessible with

Singularity> nvidia-smi

Then to initiate Conda and activate the RAPIDS environment, run

Singularity> source /opt/conda/etc/profile.d/conda.sh
Singularity> conda activate rapids

After the shell prompt changes to (rapids) Singularity>, you can launch the Jupyter Notebook server in the RAPIDS environment with the following command, and the URL of the Notebook server will be displayed after it starts successfully.

(rapids) Singularity> jupyter-lab --ip $(hostname -f) --no-browser

As there is no direct Internet connection on a compute node on Graham, you would need to set up an SSH tunnel with port forwarding between your local computer and the GPU node. See detailed instructions for connecting to Jupyter Notebook.

Submitting a RAPIDS job to the Slurm scheduler

Once you have your RAPIDS code ready and want to submit a job execution request to the Slurm scheduler, you need to prepare two script files, i.e. a job submission script and a job execution script.

Submission script

File : submit.sh

#!/bin/bash
#SBATCH --gres=gpu:t4:1
#SBATCH --cpus-per-task=2
#SBATCH --mem=10G
#SBATCH --time=dd:hh:mm
#SBATCH --account=def-someuser
module load singularity
singularity run --nv -B /home -B /scratch rapids.sif /path/to/run_script.sh

Execution script

File : run_script.sh

#!/bin/bash
source /opt/conda/etc/profile.d/conda.sh
conda activate rapids
nvidia-smi 
python /path/to/my_rapids_code.py

Helpful links

• RAPIDS Docs: a collection of all the documentation for RAPIDS, how to stay connected and report issues;
• RAPIDS Notebooks: a collection of example notebooks on GitHub for getting started quickly;
• RAPIDS on Medium: a collection of use cases and blogs for RAPIDS applications.