Pass parameters to aggregation primitives in featuretools

Question

I'm using featuretools dfs function to generate my feature_matrix using time-related aggregation primitives such as TimeSince (https://docs.featuretools.com/api_reference.html#deep-feature-synthesis)

feature_matrix, feature_defs = ft.dfs(entityset=es,
                                     target_entity="users",
                                     max_depth=2,
                                     agg_primitives=["sum", "max", "min", 
                                                     "mean", "median", "count", 
                                                     "avg_time_between"],
                                     trans_primitives=["day", "year", "month", "weekday", 
                                                       "time_since_previous", "time_since",
                                                      ],
                                     cutoff_time=cutoff_times,
                                     cutoff_time_in_index=True)

How do I pass the [unit] params to the trans_primitives argument to change the time unit to minutes, hours, etc.?

Answer 1

To pass parameters to an aggregation or transform primitive, you can create an instance of the primitive with the parameters. This is how to pass the unit parameter to the TimeSince primitive.

from featuretools.primitives import TimeSince

ft.dfs(
    ...
    trans_primitives=[TimeSince(unit='hours')]
)