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Integrate get_inactivity_penalty_deltas into reward computation for better readability

This commit is contained in:
Dankrad Feist 2021-05-06 13:03:26 +01:00
parent cf724daa7a
commit 81a8c2748f
1 changed files with 8 additions and 26 deletions
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34
specs/altair/beacon-chain.md
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@ -350,7 +350,8 @@ def get_flag_index_deltas(state: BeaconState, flag_index: int) -> Tuple[Sequence
"""
rewards = [Gwei(0)] * len(state.validators)
penalties = [Gwei(0)] * len(state.validators)
unslashed_participating_indices = get_unslashed_participating_indices(state, flag_index, get_previous_epoch(state))
previous_epoch = get_previous_epoch(state)
unslashed_participating_indices = get_unslashed_participating_indices(state, flag_index, previous_epoch)
weight = PARTICIPATION_FLAG_WEIGHTS[flag_index]
unslashed_participating_increments = get_total_balance(state, unslashed_participating_indices) // EFFECTIVE_BALANCE_INCREMENT
active_increments = get_total_active_balance(state) // EFFECTIVE_BALANCE_INCREMENT
@ -363,29 +364,11 @@ def get_flag_index_deltas(state: BeaconState, flag_index: int) -> Tuple[Sequence
rewards[index] += Gwei(reward_numerator // (active_increments * WEIGHT_DENOMINATOR))
elif not (in_inactivity_leak and flag_index == TIMELY_HEAD_FLAG_INDEX):
penalties[index] += Gwei(base_reward * weight // WEIGHT_DENOMINATOR)
return rewards, penalties
```
#### Modified `get_inactivity_penalty_deltas`
*Note*: The function `get_inactivity_penalty_deltas` is modified in the selection of matching target indices
and the removal of `BASE_REWARDS_PER_EPOCH`.
```python
def get_inactivity_penalty_deltas(state: BeaconState) -> Tuple[Sequence[Gwei], Sequence[Gwei]]:
"""
Return the inactivity penalty deltas by considering timely target participation flags and inactivity scores.
"""
rewards = [Gwei(0) for _ in range(len(state.validators))]
penalties = [Gwei(0) for _ in range(len(state.validators))]
if is_in_inactivity_leak(state):
previous_epoch = get_previous_epoch(state)
matching_target_indices = get_unslashed_participating_indices(state, TIMELY_TARGET_FLAG_INDEX, previous_epoch)
for index in get_eligible_validator_indices(state):
if index not in matching_target_indices:
penalty_numerator = state.validators[index].effective_balance * state.inactivity_scores[index]
penalty_denominator = INACTIVITY_SCORE_BIAS * INACTIVITY_PENALTY_QUOTIENT_ALTAIR
penalties[index] += Gwei(penalty_numerator // penalty_denominator)
# Quadratic inactivity leak
if flag_index == TIMELY_TARGET_FLAG_INDEX and in_inactivity_leak and index not in unslashed_participating_indices:
penalty_numerator = state.validators[index].effective_balance * state.inactivity_scores[index]
penalty_denominator = INACTIVITY_SCORE_BIAS * INACTIVITY_PENALTY_QUOTIENT_ALTAIR
penalties[index] += Gwei(penalty_numerator // penalty_denominator)
return rewards, penalties
```
@ -617,8 +600,7 @@ def process_rewards_and_penalties(state: BeaconState) -> None:
return
flag_deltas = [get_flag_index_deltas(state, flag_index) for flag_index in range(PARTICIPATION_FLAGS)]
deltas = flag_deltas + [get_inactivity_penalty_deltas(state)]
for (rewards, penalties) in deltas:
for (rewards, penalties) in flag_deltas:
for index in range(len(state.validators)):
increase_balance(state, ValidatorIndex(index), rewards[index])
decrease_balance(state, ValidatorIndex(index), penalties[index])