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Return non-duplicated sync committee subnets

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terence tsao 2021-05-13 16:22:28 -07:00 committed by GitHub
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specs/altair/validator.md
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@ -292,7 +292,7 @@ The validator broadcasts the assembled signature to the assigned subnet, the `sy
The `subnet_id` is derived from the position in the sync committee such that the sync committee is divided into "subcommittees". The `subnet_id` is derived from the position in the sync committee such that the sync committee is divided into "subcommittees".
`subnet_id` can be computed via `compute_subnets_for_sync_committee(state, validator_index)` where `state` is a `BeaconState` during the matching sync committee period. `subnet_id` can be computed via `compute_subnets_for_sync_committee(state, validator_index)` where `state` is a `BeaconState` during the matching sync committee period.
*Note*: This function returns multiple subnets if a given validator index is included multiple times in a given sync committee across multiple subcommittees. *Note*: This function returns multiple non-duplicated subnets if a given validator index is included multiple times in a given sync committee across multiple subcommittees.
```python ```python
def compute_subnets_for_sync_committee(state: BeaconState, validator_index: ValidatorIndex) -> Sequence[uint64]: def compute_subnets_for_sync_committee(state: BeaconState, validator_index: ValidatorIndex) -> Sequence[uint64]:
@ -304,10 +304,10 @@ def compute_subnets_for_sync_committee(state: BeaconState, validator_index: Vali
target_pubkey = state.validators[validator_index].pubkey target_pubkey = state.validators[validator_index].pubkey
sync_committee_indices = [index for index, pubkey in enumerate(sync_committee.pubkeys) if pubkey == target_pubkey] sync_committee_indices = [index for index, pubkey in enumerate(sync_committee.pubkeys) if pubkey == target_pubkey]
return [ return set([
uint64(index // (SYNC_COMMITTEE_SIZE // SYNC_COMMITTEE_SUBNET_COUNT)) uint64(index // (SYNC_COMMITTEE_SIZE // SYNC_COMMITTEE_SUBNET_COUNT))
for index in sync_committee_indices for index in sync_committee_indices
] ])
``` ```
*Note*: Subnet assignment does not change during the duration of a validator's assignment to a given sync committee. *Note*: Subnet assignment does not change during the duration of a validator's assignment to a given sync committee.