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Fixes as per Danny and Terence

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vbuterin 2019-01-10 22:33:22 -06:00 committed by GitHub
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specs/core/0_beacon-chain.md
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@ -858,7 +858,7 @@ def get_committee_count_per_slot(active_validator_count: int) -> int:
1, 1,
min( min(
SHARD_COUNT // EPOCH_LENGTH, SHARD_COUNT // EPOCH_LENGTH,
len(active_validator_indices) // EPOCH_LENGTH // TARGET_COMMITTEE_SIZE, active_validator_count // EPOCH_LENGTH // TARGET_COMMITTEE_SIZE,
) )
) )
``` ```
@ -883,7 +883,7 @@ def get_shuffling(seed: Hash32,
committees_per_slot = get_committees_per_slot(len(active_validator_indices)) committees_per_slot = get_committees_per_slot(len(active_validator_indices))
# Shuffle # Shuffle
seed = xor(randao_mix, bytes32(slot)) seed = xor(seed, bytes32(slot))
shuffled_active_validator_indices = shuffle(active_validator_indices, seed) shuffled_active_validator_indices = shuffle(active_validator_indices, seed)
# Split the shuffled list into epoch_length * committees_per_slot pieces # Split the shuffled list into epoch_length * committees_per_slot pieces
@ -898,7 +898,7 @@ def get_shuffling(seed: Hash32,
```python ```python
def get_previous_epoch_committee_count_per_slot(state: BeaconState) -> int: def get_previous_epoch_committee_count_per_slot(state: BeaconState) -> int:
previous_active_validators = get_active_validator_indices(validators, state.previous_epoch_calculation_slot) previous_active_validators = get_active_validator_indices(state.validator_registry, state.previous_epoch_calculation_slot)
return get_committees_per_slot(len(previous_active_validators)) return get_committees_per_slot(len(previous_active_validators))
``` ```
@ -1008,7 +1008,10 @@ def get_attestation_participants(state: BeaconState,
# Find the committee in the list with the desired shard # Find the committee in the list with the desired shard
shard_committees = get_shard_committees_at_slot(state, attestation_data.slot) shard_committees = get_shard_committees_at_slot(state, attestation_data.slot)
assert attestation.shard in [shard for _, shard in shard_committees]
shard_committee = [committee for committee, shard in shard_committees if shard == attestation_data.shard][0] shard_committee = [committee for committee, shard in shard_committees if shard == attestation_data.shard][0]
assert len(participation_bitfield) == ceil_div8(len(shard_committee)) assert len(participation_bitfield) == ceil_div8(len(shard_committee))
# Find the participating attesters in the committee # Find the participating attesters in the committee