feat(tinker): Add support for built-in loss functions and checkpoint control#523

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corbt wants to merge 7 commits intomainfrom

Commits on Jan 21, 2026

feat(tinker): add support for built-in loss functions and checkpoint control
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style: fix ruff formatting in dev/train.py
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feat: add adam_beta1, adam_beta2, adam_eps params to TinkerBackend.train()
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Add Adam optimizer params to TrainConfig TypedDict
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Commits on Jan 22, 2026

fix: handle 1D tensors in shift_tensor and NaN logprobs in Tinker API
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fix: ensure TinkerBackend uses same port for server and client
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partial changes, unclear if helpful
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