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new twap (more even)

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Young
2021-07-28 03:10:32 +00:00
parent c1992b1bb1
commit ab3c4a2c05
1 changed files with 33 additions and 28 deletions
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61
qlib/contrib/strategy/rule_strategy.py
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@@ -34,11 +34,16 @@ class TWAPStrategy(BaseStrategy):
super(TWAPStrategy, self).reset(outer_trade_decision=outer_trade_decision, **kwargs)
if outer_trade_decision is not None:
self.trade_amount = {}
self.trade_amount_remain = {}
for order in outer_trade_decision.get_decision():
self.trade_amount[order.stock_id] = order.amount
self.trade_amount_remain[order.stock_id] = order.amount
def generate_trade_decision(self, execute_result=None):
# NOTE: corner cases!!!
# - If using upperbound round, please don't sell the amount which should in next step
# - the coordinate of the amount between steps is hard to be dealed between steps in the same level. It
# is easier to be dealed in upper steps
# strategy is not available. Give an empty decision
if len(self.outer_trade_decision.get_decision()) == 0:
return TradeDecisionWO(order_list=[], strategy=self)
@@ -53,16 +58,28 @@ class TWAPStrategy(BaseStrategy):
# It is not time to start trading or trading has ended.
return TradeDecisionWO(order_list=[], strategy=self)
rel_trade_step = trade_step - start_idx # trade_step relative to start_idx
rel_trade_step = trade_step - start_idx # trade_step relative to start_idx (number of steps has already passed)
# update the order amount
if execute_result is not None:
for order, _, _, _ in execute_result:
self.trade_amount[order.stock_id] -= order.deal_amount
self.trade_amount_remain[order.stock_id] -= order.deal_amount
trade_start_time, trade_end_time = self.trade_calendar.get_step_time(trade_step)
order_list = []
for order in self.outer_trade_decision.get_decision():
# the expected trade amount after current step
amount_expect = order.amount / trade_len * (rel_trade_step + 1)
# remain amount
amount_remain = self.trade_amount_remain[order.stock_id]
# the amount has already been finished now.
amount_finished = order.amount - amount_remain
# the expected amount of current step
amount_delta = amount_expect - amount_finished
# Don't peek the future information
# if not self.trade_exchange.is_stock_tradable(
# stock_id=order.stock_id, start_time=trade_start_time, end_time=trade_end_time
@@ -71,38 +88,26 @@ class TWAPStrategy(BaseStrategy):
_amount_trade_unit = self.trade_exchange.get_amount_of_trade_unit(
stock_id=order.stock_id, start_time=order.start_time, end_time=order.end_time
)
_order_amount = None
# considering trade unit
# round the amount_delta by trade_unit and clip by remain
# NOTE: this could be more than expected.
if _amount_trade_unit is None:
# divide the order into equal parts, and trade one part
_order_amount = self.trade_amount[order.stock_id] / (trade_len - rel_trade_step)
# without considering trade unit
amount_delta_target = amount_delta
else:
# divide the order into equal parts, and trade one part
# calculate the total count of trade units to trade
trade_unit_cnt = int(self.trade_amount[order.stock_id] // _amount_trade_unit)
# calculate the amount of one part, ceil the amount
# floor((trade_unit_cnt + trade_len - rel_trade_step) / (trade_len - rel_trade_step + 1)) == ceil(trade_unit_cnt / (trade_len - rel_trade_step + 1))
_order_amount = (
(trade_unit_cnt + trade_len - rel_trade_step - 1)
// (trade_len - rel_trade_step)
* _amount_trade_unit
amount_delta_target = min(
np.round(amount_delta / _amount_trade_unit) * _amount_trade_unit, amount_remain
)
if order.direction == order.SELL:
# sell all amount at last
if self.trade_amount[order.stock_id] > 1e-5 and (
_order_amount < 1e-5 or rel_trade_step == trade_len - 1
):
_order_amount = self.trade_amount[order.stock_id]
_order_amount = min(_order_amount, self.trade_amount[order.stock_id])
if _order_amount > 1e-5:
# handle last step to make sure all positions have gone
# necessity: the last step can't be rounded to the a unit (e.g. reminder < 0.5 unit)
if rel_trade_step == trade_len - 1:
amount_delta_target = amount_remain
if amount_delta_target > 1e-5:
_order = Order(
stock_id=order.stock_id,
amount=_order_amount,
amount=amount_delta_target,
start_time=trade_start_time,
end_time=trade_end_time,
direction=order.direction, # 1 for buy