JonesLin/next-jev-stage2-last-loop

next JEV stage 2, last-loop supervision (mid-training checkpoint)

Stage 2 (3-way NLI classification + CoT) where only the last reasoning loop gets the classification CE and the CoT loss (classification_loss_scope: last_loop, aux_memory_mode: last_loop). Training is still running; this is step 1900 of 5921 (not a final model, not validated).

• Checkpoint: checkpoint-00001900/ (checkpoint.pt = FP32 weights + Adam state + training state; load with next_jev.train.load_checkpoint)
• Init: stage 1 JonesLin/next-jev-stage1-cot (step 6347)
• Code: github.com/JonnesLin/next_jev, config configs/stage2_last_loop.json (commit 26e18d9)
• Data: JonesLin/next-jev-stage2-nextjev, 378,903 train rows
• Workspace: 128 tokens, 3 loops, middle_workspace blocks 1-24
• Training: global batch 64 on 2x H100 NVL, lr 8e-06 (classifier 8e-05), cosine to 10%, BF16 autocast with FP32 master weights
• metrics.jsonl: per-step training metrics up to step 1900. W&B: https://wandb.ai/fast-ssl/next-jev/runs/f4acad907e444bf79d25f05e1d61aab2