Changed default NGram length from 1 to 2.#5248

Merged

michaelgsharp merged 3 commits intodotnet:masterfrom

michaelgsharp:fast-tree-memory-fix

Jun 26, 2020

Commits on Jun 18, 2020

make the FastTree work better with sparse data. Is much more performant with sparse data then before, slightly less performant if its dense data
michaelgsharp
committed

Commits on Jun 23, 2020

reverted FastTree changes, fixed incorrect test
michaelgsharp
committed

Commits on Jun 24, 2020

Added catagorical column to wiki detox data
michaelgsharp
committed