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[mpmd] Add hashing support for PipelineSchedule #982

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[mpmd] Add hashing support for PipelineSchedule #982

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18 changes: 18 additions & 0 deletions shardy/integrations/python/jax/mpmd/pipeline.py
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Original file line number Diff line number Diff line change
Expand Up @@ -44,8 +44,11 @@
from collections.abc import Collection, Mapping, Sequence, Set
import dataclasses
import enum
import hashlib
from typing import Callable

import cloudpickle

FragmentMergeRules = Sequence['FragmentMergeRule']
FragmentScheduleRules = Sequence['FragmentScheduleRule']

Expand Down Expand Up @@ -367,6 +370,21 @@ def build_rules_from_pipeline(
return all_schedule_rules, all_merge_rules


def fingerprint_pipeline_schedule(pipeline: PipelineSchedule) -> bytes:
"""Generates a fingerprint for a PipelineSchedule."""
hasher = hashlib.sha256()

if pipeline.schedule_merge_rule_builders:
for builder in pipeline.schedule_merge_rule_builders:
serialized_callable = cloudpickle.dumps(builder)
hasher.update(serialized_callable)

# required_mpmd_options is not hashed since the entire partitioning
# environment gets hashed later on.

return hasher.digest()


def maybe_unique_transpose_count(
fragment: FragmentInfo,
) -> int | None:
Expand Down
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