[vla, scripts] feat: add FastWAM ZeRO-1 SFT example - #138
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Adds
examples/embodied/fastwam/run_fastwam_sft_zero1.sh, a FastWAM SFT launch script using DDP + ZeRO Stage-1, alongside the existing plain-DDP example.The plain-DDP script (
run_fastwam_sft_ddp.sh) replicates optimizer state on every rank, which caps--per-device-batch-sizeat 1. Sharding optimizer state withZeroRedundancyOptimizerfrees enough memory to run at--per-device-batch-size 16on the same 8-GPU node, so this gives users a ready-made higher-throughput starting point without hand-tuning the DDP flags.