Add versioned trainer graphs and logical-rank APIs - #925
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Adds logical DP and rank-zero training APIs, versioned backward graphs, and checkpoint-owned live parameters/modules. The planner can retain, offload or replay state; backward validates and commits gradients transactionally. Default gradient staleness is two updates (
0is strict), with eligible importance correction when current probabilities are available. Native retained backward supports BF16 and rejects unsupported quantized Transformer Engine state.Paired with Caladan #459. Root and fresh Astra/Fable reviews approve the grouped changes. Required CPU and two-H200 GPU CI pass on
de6a8d952; CPU coverage includes 851 Megatron and 2,269 root unit passes. The workflow-owned GPU cluster has an original successful termination acknowledgment. The paired Caladan PR remains blocked on a PostgreSQL readiness timeout.Earlier revisions passed eight-GPU derivative/memory canaries, matched-schedule learning comparisons and a configured protocol-8 factory smoke; those results retain their original source scope. Qwen3-8B benchmarks measured 12.1% lower throughput at four 1K inputs (ABBA) and 4.5% lower at four 4K inputs (one pair). This cleanup makes no new throughput claim.