def subtree_proposal(self):
"""
Proposes a new state based on current state using subtree move
Uses base class PCFGTree's subtree_proposal_propose_tree to generate
new tree, then samples positions for new added parts
"""
pcfg_proposal = PCFGTree.subtree_proposal_propose_tree(self)
# get a new spatial model based on proposed tree
proposed_spatial_model = self.spatial_model.propose(pcfg_proposal, self.grammar)
proposal = self.__class__(forward_model=self.forward_model, data=self.data, ll_params=self.ll_params,
spatial_model=proposed_spatial_model, initial_tree=pcfg_proposal)
acc_prob = self._subtree_acceptance_probability(proposal)
return proposal, acc_prob
def subtree_proposal(self):
"""
Proposes a new state based on current state using subtree move
Uses base class PCFGTree's subtree_proposal_propose_tree to generate
new tree, then samples positions for new added parts
"""
pcfg_proposal = PCFGTree.subtree_proposal_propose_tree(self)
# get a new spatial model based on proposed tree
proposed_spatial_model = self.spatial_model.propose(
pcfg_proposal, self.grammar)
proposal = self.__class__(forward_model=self.forward_model,
data=self.data,
ll_params=self.ll_params,
spatial_model=proposed_spatial_model,
initial_tree=pcfg_proposal)
acc_prob = self._subtree_acceptance_probability(proposal)
return proposal, acc_prob
