The most powerful supercomputer in the world has used just over 8% of the GPUs it's fitted with to train a large language model (LLM) containing one trillion parameters – comparable to OpenAI's GPT-4.
Frontier, based in the Oak Ridge National Laboratory, used 3,072 of its AMD Radeon Instinct GPUs to train an AI system at the trillion-parameter scale, and it used 1,024 of these GPUs (roughly 2.5%) to train a 175-billion parameter model, essentially the same size as ChatGPT.
The researchers needed 14TB RAM minimum to achieve these results, according to their paper, but each MI250X GPU only had 64GB VRAM, meaning the researchers had to group up several GPUs together. This introduced another challenge in the form of parallelism, however, meaning the components had to communicate much better and more effectively as the overall size of the resources used to train the LLM increased.
Putting the world's most powerful supercomputer to work
LLMs aren't typically trained on supercomputers, rather they're trained in specialized servers and require many more GPUs. ChatGPT, for example, was trained on more than 20,000 GPUs, according to TrendForce. But the researchers wanted to show whether they could train a supercomputer much quicker and more effectively way by harnessing various techniques made possible by the supercomputer architecture.
The scientists used a combination of tensor parallelism – groups of GPUs sharing the parts of the same tensor – as well as pipeline parallelism – groups of GPUs hosting neighboring components. They also employed data parallelism to consume a large number of tokens simultaneously and a larger amount of computing resources. The overall effect was to achieve a much faster time.
For the 22-billion parameter model, they achieved peak throughput of 38.38% (73.5 TFLOPS), 36.14% (69.2 TFLOPS) for the 175-billion parameter model, and 31.96% peak throughput (61.2 TFLOPS) for the 1-trillion parameter model.
They also achieved 100% weak scaling efficiency%, as well as an 89.93% strong scaling performance for the 175-billion model, and an 87.05% strong scaling performance for the 1-trillion parameter model.
Although the researchers were open about the computing resources used, and the techniques involved, they neglected to mention the timescales involved in training an LLM in this way.
TechRadar Pro asked the researchers for timings, but they have not responded at the time of writing.
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