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How do you combine data, tensor, and pipeline parallelism (3D parallelism) to train a 175B model?

No single parallelism dimension trains a 175B model on its own. The art is layering three of them onto the right hardware so the expensive communication stays on the fast links. Here is how to size each axis.

Updated Aug 2026 · Grounded in real Applied AI Engineer interview loops and written to a senior-engineer editorial bar.

No single parallelism dimension trains a 175B model on its own. The art is layering three of them onto the right hardware so the expensive communication stays on the fast links. Here is how to size each axis.

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