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Improve memory usage through support for pandas categorical types #196
Currently, we convert columns that are pandas categorical types to an object type. This is bad for memory usage.
This pull request changes removes that conversion so that the categorical dtype is preserved while running featuretools.
Test cases pass, but more integration and performance testing is needed.
@@ Coverage Diff @@ ## master #196 +/- ## ========================================== + Coverage 93.21% 93.26% +0.05% ========================================== Files 70 70 Lines 7727 7726 -1 ========================================== + Hits 7203 7206 +3 + Misses 524 520 -4