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In the Quantopian Open, leverage is constrained to 3x for eligible entries. You can track and control your algorithm leverage using the context.account.leverage variable.
But quantconnect how to do it ?
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Derek Tishler
On the quantopian transfer post, Alexandre Catarino shared a way:
account_leverage = self.Portfolio.TotalAbsoluteHoldingsCost / self.Portfolio.TotalPortfolioValueI chart it it once a day with my minute algos(you don't want to spam the charts they have limits, see docs):
# in Initialize self.splotName = 'Strategy Info' sPlot = Chart(self.splotName) sPlot.AddSeries(Series('RAM', Â SeriesType.Line, 0)) self.AddChart(sPlot) # periodicaly in algo self.Plot(self.splotName,'RAM', OS.ApplicationMemoryUsed/1024.)Settiing leverage depends, you may want to review the docs on a couple topics there. You can set leverage for self.UniverseSettings.Leverage if using AddUniverse, and or set the pattern day trade model for 2 overnight 4 iintrday using security.MarginModel = PatternDayTradingMarginModel(), or manually set each asset;s leverage when using AddEquity.
Cash and Broker Models
AddEquity and use of manual leverage setting
Derek Tishler
I noticed in my charts that the above leverage calc will not account for current value of positions, but rather just their average cost as the names suggest. Meaning that your unrealized profits will be left out of your leverage calc, which may not be desired.
self.account_leverage = self.Portfolio.TotalHoldingsValue / self.Portfolio.TotalPortfolioValueLuca Herrtti
Hey,
To try to avoid losing everything when I exceed memory I wrote the following lines to liquidate everything
if OS.ApplicationMemoryUsed > 2000: self.Log("------------------ RAM went up to {}Mb: Liquidation! ------------------".format(OS.ApplicationMemoryUsed)) for security in self.ActiveSecurities.Values: self.Liquidate(security.Symbol) orders = self.Transactions.GetOrders(None) for order in orders: if self.Portfolio[order.Symbol].Invested: self.Liquidate(order.Symbol)But it's problematic because I don't understand what are the units of that OS.ApplicationMemoryUsed, I have a memory of 2048Mb, but that self.Log line is saying 'RAM went up to 12706Mb: Liquidation!' and I can't make sense of it.
Anybody has an interesting insight on it?
Thanks!
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Alexandre Catarino
Hi Luca Herrtti ,
OS.ApplicationMemoryUsed is the amount of private memory allocated for the current process (includes both managed and unmanaged memory) in Mb.
I think you should look for OS.TotalPhysicalMemoryUsed instead, since Lean tracks a moving average that variable to safely quit the algorithm. But, when the algorithm exists nicely, the algorithm is able to call OnEndOfAlgorithm and we can use it to liquidate the positions.
DEVON
The material on this website is provided for informational purposes only and does not constitute an offer to sell, a solicitation to buy, or a recommendation or endorsement for any security or strategy, nor does it constitute an offer to provide investment advisory services by QuantConnect. In addition, the material offers no opinion with respect to the suitability of any security or specific investment. QuantConnect makes no guarantees as to the accuracy or completeness of the views expressed in the website. The views are subject to change, and may have become unreliable for various reasons, including changes in market conditions or economic circumstances. All investments involve risk, including loss of principal. You should consult with an investment professional before making any investment decisions.
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