Engineering / advanced
Recover training state faithfully
Specify which state a checkpoint represents, make distributed writes recoverable, and verify resumed training under changed topology and partial failure.
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Inside this module
Module 01 advanced
Recover training state faithfully
Specify which state a checkpoint represents, make distributed writes recoverable, and verify resumed training under changed topology and partial failure.
- 01
Complete training-state inventory
Define the state needed to reproduce the next training transition, rather than equating model weights with a resumable experiment.
25 min - 02
Consistent checkpoint-cut selection
Choose a logical update boundary and preserve its causal dependencies before asynchronous serialization begins.
25 min - 03
Distributed checkpoint manifests
Use metadata to prove logical coverage, bind shard identities, and reject incomplete generations before restoration.
25 min - 04
Asynchronous checkpoint staging
Separate immutable capture from background persistence, and bound source lifetimes, staging memory, and outstanding work.
25 min - 05
Sharded checkpoint resharding
Reconstruct destination tensor regions from logical identities and source intersections rather than reassigning rank filenames.
25 min - 06
Incremental checkpoints and deduplication
Reduce repeated storage only while preserving exact reconstruction, live dependency closure, and safe garbage collection.
25 min - 07
Checkpoint commit and atomic promotion
Turn completed immutable payloads into an unambiguous recovery generation with crash-safe publication and retry semantics.
25 min - 08
Optimizer, RNG, and data-cursor recovery
Restore the hidden histories that determine the next update and distinguish a saved generator state from a repeated initial seed.
25 min - 09
Topology-changing training resume
Separate supported state redistribution from preserving effective batch semantics, numerical behavior, and data ownership after scaling.
25 min - 10
Checkpoint corruption and restore drills
Detect broken payloads, validate trusted provenance, and prove recovery with staged structural and next-update oracles.
25 min