Social_Media_with_followers::default_media_user Struct Reference

Implements the virtual functions in Social_Media_with_followers::media_user. More...

Inheritance diagram for Social_Media_with_followers::default_media_user:

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Public Member Functions
	default_media_user (Social_Media_no_followers *media, const Node &node)
	Constructor that takes the media pointer this user is apart of and the iterator containing all the required node attributes. More...
Social_Media_with_followers &	media ()
void	enrich_event (media_event *_event) override
	Uses default_media_user::add_mentions to add mentions to all non-reposts and calls the base function. More...
virtual void	add_mentions (media_event *post)
	Mentions are added to the event by randomly selecting a followee. More...
bool	follow_user (unsigned int alter_agent_index) override
	Returns true if this user decides to follow an agent when called. More...
bool	unfollow_user (unsigned int alter_agent_index) override
	Returns true if this user decides to unfollow an agent when called. More...
bool	respond_to_follow (unsigned int alter_agent_index) override
	Returns the value of default_media_user::auto_follow. More...
unsigned int	consider_recommendations (void) override
	Draws a poisson number with mean value of default_media_user::pdaf. More...
float	get_charisma () override
	Returns default_media_user::charisma. More...
Public Member Functions inherited from Social_Media_no_followers::default_media_user
	default_media_user (Social_Media_no_followers *reddit, const Node &node)
	Constructor that takes the media pointer this user is apart of and the iterator containing all the required node attributes. More...
Social_Media_no_followers &	media ()
void	parse (media_event *_event)
	The parsed event is checked to ensure it contains knowledge More...
void	reply (media_event *_event)
	With proabability default_media_user::pr creates a reply to the event. More...
void	quote (media_event *_event)
	With proabability default_media_user::pqu creates a quote to the event. More...
void	repost (media_event *_event)
	With proabability default_media_user::prp creates a quote to the event. More...
void	generate_post_events (void)
	The user adds a number of post events based on default_media_user::pdp. More...
unsigned int	get_read_count (void)
	The user reads a number of events based on default_media_user::pdread. More...
virtual void	enrich_event (media_event *_event)
	Enirches the event with information. More...
virtual unsigned int	get_knowledge_selection (void)
	Called during media_user::generate_post_events to choose which piece of knowledge to add to a media_event. More...
std::set< media_event * >	read (media_event *read_event)
	Collects all events an agent will parse when reading an event. More...
Public Member Functions inherited from Social_Media_no_followers::media_user
Random &	random ()
	media_user (Social_Media_no_followers *media)
virtual	~media_user ()
virtual void	parse (media_event *read_event)=0
	Called during Social_Media_no_followers::communicate when an agent parses an event. This function is called once for every message. More...
virtual void	reply (media_event *read_event)=0
	Called after media_user::parse only if this agent posseses the knowledge in the read event. This function should create a reply based on the implementation's conditions. More...
virtual void	quote (media_event *read_event)=0
	Called after media_user::parse only if this agent posseses the knowledge in the read event. This function should create a quote based on the implementation's conditions. More...
virtual void	repost (media_event *read_event)=0
	Called after media_user::parse only if this agent posseses the knowledge in the read event and read_event::type equals media_event::event_types::post. This function should create a repost based on the implementation's conditions. More...
virtual void	generate_post_events (void)=0
	Called during Social_Media_no_followers::think. Function should generate post events using Social_Media_no_followers::create_post. More...
virtual unsigned int	get_read_count (void)=0
	Called during Social_Media_no_followers::think to determine how many events to read in a user's feed. More...
virtual std::set< media_event * >	read (media_event *read_event)=0
	Called during Social_Media_no_followers::think to determine which other events should be added to an InteractionMessage in addition to the read event. More...
virtual bool	follow_user (unsigned int alter_agent_index)=0
	Returns true if this user decides to follow an agent More...
virtual bool	unfollow_user (unsigned int alter_agent_index)=0
	Returns true if this user decides to unfollow an agent More...
virtual bool	respond_to_follow (unsigned int alter_agent_index)=0
	An alter has decided to follow this user and can decide to reciprocate that following. More...
virtual unsigned int	consider_recommendations (void)=0
	Returns how many agents should be considered to be followed in Social_Media_with_followers::add_followees More...
virtual float	get_charisma ()=0
	Returns the user's charisma or how likable the user is independent of other user attributes. More...

Public Attributes
float	pdaf
	The probability density for how many agents will be recommended to an agent to follow each time step. More...
float	rf
	The scale factor to determine number of removed followees.
float	charisma
	This determines how likable someone's event is going to be.
bool	auto_follow
	If true, this user, when added as a followee by another user, will automatically reciprocate followings
Public Attributes inherited from Social_Media_no_followers::default_media_user
unsigned int	id
	This user's agent index.
float	pdp
	The probability density to post pdtw * dt = average number of events in a time period.
float	pr
	The probability to reply when an event is read.
float	prp
	The probability to repost when a post is read.
float	pqu
	The probability to quote when an event is read.
float	pdread
	The probability density to read events (time in hours) pdread * dt = average number of read messages in a time period.
Public Attributes inherited from Social_Media_no_followers::media_user
Social_Media_no_followers *	media_ptr

Detailed Description

Implements the virtual functions in Social_Media_with_followers::media_user.

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Constructor & Destructor Documentation

default_media_user()

Social_Media_with_followers::default_media_user::default_media_user	(	Social_Media_no_followers *	media,
		const Node &	node
	)

Constructor that takes the media pointer this user is apart of and the iterator containing all the required node attributes.

Some required node attribute names depend on Social_Media_with_followers::media_name. Thus the following attributes are required in addition to the attributes required by Social_Media_no_followers::default_media_user:

• media_name + " add follower density"
• media_name + " remove follower scale factor"
• media_name + " auto follow"
• media_name + " charisma"

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Member Function Documentation

add_mentions()

void Social_Media_with_followers::default_media_user::add_mentions ( media_event *  post )

virtual

Mentions are added to the event by randomly selecting a followee.

This function is called during default_media_user::enrich_event.

Reimplemented in SM_wf_emotions::default_media_user.

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consider_recommendations()

unsigned int Social_Media_with_followers::default_media_user::consider_recommendations ( void  )

overridevirtual

Draws a poisson number with mean value of default_media_user::pdaf.

Implements Social_Media_with_followers::media_user.

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enrich_event()

void Social_Media_with_followers::default_media_user::enrich_event ( media_event *  _event )

overridevirtual

Uses default_media_user::add_mentions to add mentions to all non-reposts and calls the base function.

Reimplemented from Social_Media_no_followers::default_media_user.

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follow_user()

bool Social_Media_with_followers::default_media_user::follow_user ( unsigned int  alter_agent_index )

overridevirtual

Returns true if this user decides to follow an agent when called.

Uses a Euclidian distance between the ego agent's knowledge trust and the ego agent's transactive memory for the alter agent. The greater the distance the less likely the ego agent is to follow the alter agent. Finally the probability is multiplied by the alter agent's charisma.

Implements Social_Media_with_followers::media_user.

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get_charisma()

float Social_Media_with_followers::default_media_user::get_charisma ( )

overridevirtual

Returns default_media_user::charisma.

Implements Social_Media_with_followers::media_user.

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respond_to_follow()

bool Social_Media_with_followers::default_media_user::respond_to_follow ( unsigned int  alter_agent_index )

overridevirtual

Returns the value of default_media_user::auto_follow.

Implements Social_Media_with_followers::media_user.

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unfollow_user()

bool Social_Media_with_followers::default_media_user::unfollow_user ( unsigned int  alter_agent_index )

overridevirtual

Returns true if this user decides to unfollow an agent when called.

Three factors currently contribute to unfollowing an agent, whether a following relationship is bidirectional or unidirectional, receiving responses to your events, and the jacard similarity of the alter agent's followers and the ego agent's followers. More information on the impact of these factors can be seen in Kwak et al. More of a Receiver Than a Giver: Why Do People Unfollow in Social_Media_with_followers? AAAI (2012). The resulting probability is multiplied by Social_Media_with_followers::dt to ensure a similar number of agents are unfollowed regardless of the time between time periods. The probability is also divided by media_user::rf to allow for tuning of the removing of followers.

Implements Social_Media_with_followers::media_user.

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Member Data Documentation

pdaf

float Social_Media_with_followers::default_media_user::pdaf

The probability density for how many agents will be recommended to an agent to follow each time step.

The average number of agents recommended in a time period is pdaf * dt and is sampled from a poisson distribution. Each agent this is recommended a follower is asked via media_user::follow_user and is only added as a follower if the function returns true.