Semantic Belief Tracking¶
-
class
semanticbelieftracking.SemanticBeliefTrackingManager.
SemanticBeliefTracker
(dstring)¶ The class specifying the interface for all per domain semantic belief trackers.
-
bootup
(previousDomain)¶ To boot up the semi tracker for the given domain taking into account constraints of previousDomain, this method is called to handle effects internally, e.g., transferring information from one domain to the other.
Should be implemented in a sub-class.
Parameters: previousDomain (str) – the domain identifier string of the previous domain in case there was a domain switch Returns: a list of constraints
-
hand_control
(previousDomain)¶ To hand over control from domainString to previousDomainString, this method is called to handle effects internally, e.g., transferring information from one domain to the other.
Should be implemented in a sub-class.
Parameters: previousDomain (str) – the domain identifier string of the previous domain in case there was a domain switch Returns: a list of constraints
-
restart
(previousDomainString=None)¶ Restarts the semantic belief tracker and resets internal variables. If special handling is required if a domain switch has occurred, this method should be overridden in a sub-class.
Parameters: previousDomainString (str) – the domain identifier string of the previous domain, obtional, default None Returns: None
-
update_belief_state
(ASR_obs, sys_act, constraints, turn=None, hub_id=None)¶ Updates the belief state based on the given input.
Should be implemented in a sub-class.
Parameters: - ASR_obs (list) – the list of ASR hypotheses
- sys_act (str ?) – the last system act (necessary for deriving context information)
- constraints (list) – internal constraints derived from previous domain in case of domain switch
- turn (int) – the current turn number
- hub_id (string) – the hub id (identifying texthub vs. simulate vs. dialogue server)
Returns: the updated belief state and the last semantic hypotheses if present, otherwise empty list
-
-
class
semanticbelieftracking.SemanticBeliefTrackingManager.
SemanticBeliefTrackingManager
¶ The semantic belief tracking manager manages the semantic belief trackers for all domains. A semantic belief tracker is a mapping from words/ASR input to belief state.
Its main interface method is
update_belief_state()
which updates and returns the internal belief state on given input.Internally, a dictionary is maintained which maps each domain to a
SemanticBeliefTracker
object which handles the actual belief tracking.-
_load_domains_semantic_belief_tracker
(domainString)¶
-
bootup
(domainString, previousDomainString=None)¶ Loads a semi belief tracker for a given domain.
Parameters: - domainString (str) – the domain identifier string
- previousDomainString (str) – the domain identifier string of the previous domain in case there was a domain switch, optional
Returns: None
-
getDomainBelief
(operatingDomain)¶ Returns the belief state of the specified domain.
Parameters: operatingDomain (str) – the domain identifier string Returns: the belief state of the specified domain
-
hand_control
(domainString, previousDomainString=None)¶ To hand over control from domainString to previousDomainString, this method is called to handle effects internally, e.g., transferring information from one domain to the other.
Calls
SemanticBeliefTracker.hand_control()
of the domain domainString and sets the internal constraints accordingly.Parameters: - domainString (str) – the domain identifier string
- previousDomainString (str) – the domain identifier string of the previous domain in case there was a domain switch, optional
-
restart
()¶ Restarts all semantic belief trackers of all domains and resets internal variables.
-
update_belief_state
(dstring, ASR_obs, sys_act, turn=None, hub_id=None, sim_lvl='dial_act')¶ Updates the belief state of the specified domain based on the given input.
Parameters: - dstring (str) – the domain identifier string
- ASR_obs (list) – the list of ASR hypotheses
- sys_act (str ?) – the last system act (necessary for deriving context information)
- turn (int) – the current turn number
- hub_id (string) – the hub id (identifying texthub vs. simulate vs. dialogue server)
Returns: the updated belief state
-
ModularSemanticBeliefTraker.py - separate modelling of semantic decoding and belief tracking¶
Copyright CUED Dialogue Systems Group 2015 - 2017
See also
CUED Imports/Dependencies:
import utils.ContextLogger
import belieftracking.BeliefTrackingManager
import semi.SemI
import semanticbelieftracking.SemanticBeliefTrackingManager.SemanticBeliefTracker
-
class
semanticbelieftracking.ModularSemanticBeliefTracker.
ModularSemanticBeliefTracker
(domainString)¶ This class implements the functionality of the original spoken dialogue systems pipeline where semantic decoding and belief tracking are looked at as two separate problems. Refers all requests to
semi.SemI.SemIManager
andbelieftracking.BeliefTrackingManager.BeliefTrackingManager
.