Test docs

Signed-off-by: Nghia Truong <[email protected]>

cpp/include/cudf/aggregation/host_udf.hpp

@@ -219,14 +219,7 @@ struct aggregate_result_functor;
 /**
  * @brief The interface for host-based UDF implementation for groupby aggregation context.
  *
- * An implementation of host-based UDF for groupby needs to be derived from this class.
- * In addition to implementing the virtual functions declared in the base class `host_udf_base`,
- * such derived class must also define the functions `get_empty_output` to return result when the
- * input is empty, and `operator()` to perform its groupby operations.
- *
- * During execution, the derived class can access to internal data provided by libcudf groupby
- * framework through a set of ``get*`` accessors, as well as calling other build-in groupby
- * aggregations through the `compute_aggregation` function.
+ * TODO.
  *
  * @note The derived class can only perform sort-based groupby aggregations. Hash-based groupby
  * aggregations require more complex data structure and is not yet supported.