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Migrate Tunelab to Orbax PreservationPolicy for checkpoint management. #2359

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Migrate Tunelab to Orbax PreservationPolicy for checkpoint management. #2359

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12 changes: 11 additions & 1 deletion checkpoint/orbax/checkpoint/_src/checkpoint_managers/preservation_policy.py
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Original file line number Diff line number Diff line change
Expand Up @@ -157,7 +157,17 @@ def should_preserve(
) -> Sequence[bool]:
if self.interval_steps == 0:
raise ValueError("interval_steps must not be 0.")
result = [ckpt.step % self.interval_steps == 0 for ckpt in checkpoints]
result = []
previous_step = None
for i, ckpt in enumerate(checkpoints):
if i == 0:
result.append(True) # Always preserve the first checkpoint.
previous_step = ckpt.step
elif ckpt.step - previous_step >= self.interval_steps:
result.append(True)
previous_step = ckpt.step
else:
result.append(False)
_log_preservation_decision(
f"EveryNSteps (interval_steps={self.interval_steps})",
checkpoints,
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