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Any walk-forward framework...

Friends,

Has anyone have implemented walk forward optimization in Quantopian.

I find it difficult since the standard backtest feature is not callable during
live trading.

3 responses

Hi Yagnesh,

I've spent a fair amount of time thinking about this (see e.g. http://blog.quantopian.com/parameter-optimization/ and http://blog.quantopian.com/zipline_in_the_cloud/). While the first one discusses walk-forward optimization, it does not implement it and unfortunately it is not straight forward to do with zipline/Quantopian for the reason you mention. What you want to do is freeze the algorithm (perhaps by pickling it) at a certain point in time and then play it forward with different parameter combinations.

Having said that, we are currently exploring more clever optimization techniques with zipline (but not walk-forward yet).

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If you can frame your model in vectorized terms (for instance, in Research to begin with), it's possible to optimize your parameters over history data. Optimizing actual event-driven sub-backtests I would think would be much too slow to do in 50 seconds.

I was under the impression that the API announced on https://www.quantopian.com/posts/how-to-build-a-stat-arb-strategy-on-quantopian would allow for more extensive number crunching (e.g. churning over large baskets of stocks either in the background during the trading day or overnight). If so, would it also allow for optimization routines that take longer than 50 seconds?