turi::groupby_operators::variance Class Reference

#include <core/storage/sframe_data/groupby_aggregate_operators.hpp>

Public Member Functions
virtual group_aggregate_value *	new_instance () const
	Returns a new empty instance of count.
void	add_element_simple (const flexible_type &flex)
	Adds a new element to be counted.
void	combine (const group_aggregate_value &other)
	combines two partial counts
virtual flexible_type	emit () const
	Emits the count result.
bool	support_type (flex_type_enum type) const
	The types supported by the count.
flex_type_enum	set_input_type (flex_type_enum type)
	The input type.
virtual std::string	name () const
	Name of the class.
void	save (oarchive &oarc) const
	Serializer.
void	load (iarchive &iarc)
	Deserializer.
virtual void	print (std::ostream &os) const
virtual void	add_element (const std::vector< flexible_type > &values)
virtual void	partial_finalize ()
virtual flex_type_enum	set_input_types (const std::vector< flex_type_enum > &types)

Detailed Description

Impelments the variance operator. Algorithm adapted from http://en.wikipedia.org/wiki/Algorithms_for_calculating_variance#Parallel_algorithm

Definition at line 807 of file groupby_aggregate_operators.hpp.

Member Function Documentation

add_element()

virtual void turi::group_aggregate_value::add_element ( const std::vector< flexible_type > &  values )

inlinevirtualinherited

Adds an element to the aggregate. Elements to be added will be either the input_type (as set by set_input_type()) or UNDEFINED.

Operator that expects more than one input values need to overwrite this function

Reimplemented in turi::groupby_operators::zip_dict, turi::groupby_operators::argmax, and turi::groupby_operators::argmin.

Definition at line 60 of file group_aggregate_value.hpp.

partial_finalize()

virtual void turi::group_aggregate_value::partial_finalize ( )

inlinevirtualinherited

No more elements will be added to this value. However, this value may still be combined with other values.

Reimplemented in turi::groupby_operators::quantile.

Definition at line 75 of file group_aggregate_value.hpp.

print()

virtual void turi::groupby_operators::variance::print ( std::ostream &  os ) const

inlinevirtual

Override this function for allowing the operator to be easily printed.

std::cout << aggregator <<s std::endl;

Reimplemented from turi::group_aggregate_value.

Definition at line 873 of file groupby_aggregate_operators.hpp.

set_input_types()

virtual flex_type_enum turi::group_aggregate_value::set_input_types ( const std::vector< flex_type_enum > &  types )

inlinevirtualinherited

Sets the input types and returns the output type. For instance, a sum aggregator when summing integers will return an integer, and when summing doubles will return doubles.

Default implementation assumes there is ony one input, and output type is the same as input type.

Reimplemented in turi::groupby_operators::zip_list, turi::groupby_operators::zip_dict, turi::groupby_operators::non_null_count, turi::groupby_operators::count, turi::groupby_operators::argmax, and turi::groupby_operators::argmin.

Definition at line 102 of file group_aggregate_value.hpp.

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The documentation for this class was generated from the following file:

• core/storage/sframe_data/groupby_aggregate_operators.hpp