It's important that we keep the factor files consistent with respect to
the date that they were generated. This enables us to run the regression
algorithms in the cloud and get the same results by using the factor files
from the correct date.
A mechanical refactoring was performed to make algorithms currently used in
regression algorithms to implement IRegressionAlgorithmDefinition, which allows
algorithms to define their own expected statistics and what languages should be
run as part of regression. The type name of the C# type is used to determine the
file/model name for python. This was for simplicity, but if needed, could later be
refactored to expose more information, but for now the convention of keeping names
the same makes sense and just works easily.
This change adds OnData(Delisting data) event handler to the algorithm and is fired when a security gets delisted.
Likewise, when a security is delisted, data will stop being sent into the algorithm and if the algorithm has any
holdings then a MarketOnClose order is submitted at midnight on the last day of trading. If you require that the
algorithm does not sell its shares, then you must cancel the MarketOnClose order before close of trading.
Michael Handschuh