fix: restore GR00T N1.5 dataloader state#1236
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Signed-off-by: root <yilongma0110@gmail.com>
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Align GR00T N1.5 checkpoint resume with the existing Qwen GR00T implementation by saving and restoring
StatefulDistributedSamplerstate.This avoids replaying previously consumed video batches and reduces the risk of HCCL timeout during resume.