NVIDIA GTC SV 2019 に参加しました Report from NVIDIA GTC SV 2019

Last week I attended NVIDIA GPU Technology Conference (GTC) held at San Jose, CA on 17-21 March, 2019. This is a short report mainly focused on AI and HPC part of the conference, while the other parts are graphics and robotics (in line with Jensen Huang’s keynote).

I have attended GTC in Japan before. GTC in San Jose, called GTC SV (meaning Silicon Valley) for short, does have more sessions and more participants (reportedly 9000) than GTC in Japan. With so many sessions, many of which are conducted in parallel, it is hard to build up a personal schedule. If you look at the schedule of all the sessions of GTC SV attached below, you can see that up to almost 28 sessions, that include talks, instructor-led trainings and tutorials, were held on the same time.

There were not so many new hardware announcements. Worth mentioning is a new Jetson NANO, probably the cheapest computer with a GPU you can get: it only costs $99 in the US.

In contrast to the hardware, there were quite a lot of announcements of the software.
Data Science was one of the main keywords throughout the conference. With the purpose of taking all data science workflow (or “pipeline”) to GPU, NVIDIA is developing a suite of software libraries called RAPIDS. It also includes some of the software developed before, such as pydf.

NVIDIA CEO Jensen Huang’s keynote speech. Chapter 2. AI and HPC.

End-to-end GPU data science pipeline also incorporates libraries being developed by other companies, such as CuPy and Numba.
The main idea of this pipeline is to do all data processing on GPUs without moving data between the host and GPU memory. For datacenters this GPU pipeline will also require networking hardware with support for RDMA, RoCE and GPUdirect, which provide data transfer among GPU memory of multiple GPUs on multiple nodes without using CPUs.
The pipeline is meant to be easy to use for those familiar with existing data science tools such as pandas and scikit-learn. For handling data in dataframes RAPIDS includes cuDF, which mimics pandas. For machine learning algorithms library RAPIDS has cuML which is used in place of scikit-learn.

RAPIDS will also have visualization part in the future.
RAPIDS can work together with existing NN frameworks on top of cuDNN such as TensorFlow.

cuDF can seamlessly scale-up to multiple GPUs and scale-out to multiple nodes.
RAPIDS libraries are easy to install (I used a docker image, but there are other options too) and provide a multifold speedup compared to CPU libraries for large amounts of data. However, if you decide to use RAPIDS, please keep in mind that RAPIDS is still in beta and being actively developed.

Another piece of software that nicely fits into NVIDIA’s concept of end-to-end GPU data science pipeline is HOROVOD. It is a software framework for distributed training using TensorFlow, Keras, PyTorch or MXNet. It has been developed for a couple of years by now in Uber. It was not announced at GTC SV, but there were a few HOROVOD sessions. HOROVOD is doing multi-GPU multi-node training on top of MPI and NCCL 2 with support of RoCE and GPUDirect. It seems to be easy to integrate into existing Python code and is reportedly faster than native distributed training solutions in TensorFlow.

At GTC I was presenting our poster: “Towards Estimating DNN Training Time and Cloud Cost”. We are conducting this research with the goal to be able to predict for arbitrary CNN application its training time on unseen GPU types within a wide range of mini-batch sizes.
This research, though still in early stage, drew much attention. One of the largest companies in deep learning field is conducting similar research according to one of this company employees.

There were many other interesting posters presented at GTC SV. NVIDIA has kindly made them accessible online.

Next GTC in San Jose will be held on March 22 – 26, 2020