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PyTorch

PyTorch introduces torchcomms, an experimental communication API designed for distributed training at massive scale (100K+ GPUs). The release includes NCCLX, a new backend used in production for Meta's LLMs like Llama. Torchcomms aims to enable faster prototyping of communication primitives, heterogeneous hardware support, fault tolerance, one-sided communication, and device-centric collectives. The API is object-oriented with eager initialization, supports DeviceMesh integration for compatibility with FSDP2, and includes backends for NCCL, RCCL, and Gloo. While experimental and subject to breaking changes, it's designed to eventually replace PyTorch's c10d interface. The project is fully open-source with extensibility for custom backends and collectives.

torchcomms: a modern PyTorch communications API – PyTorch