def timetree_likelihood(self):
LH = <NUM_LIT:0><EOL>for node in self.tree.find_clades(order='<STR_LIT>'):  <EOL><INDENT>if node.up is None: <EOL><INDENT>continue<EOL><DEDENT>LH -= node.branch_length_interpolator(node.branch_length)<EOL><DEDENT>if self.aln:<EOL><INDENT>LH += self.gtr.sequence_logLH(self.tree.root.cseq, pattern_multiplicity=self.multiplicity)<EOL><DEDENT>return LH<EOL>
Return the likelihood of the data given the current branch length in the tree