dendropy.model.reconcile
: TreeFitting (Gene/Species, Parasite/Host, etc.)¶
Classes and Methods for working with tree reconciliation, fitting, embedding, contained/containing etc.

class
dendropy.model.reconcile.
ContainingTree
(containing_tree, contained_taxon_namespace, contained_to_containing_taxon_map, contained_trees=None, fit_containing_edge_lengths=True, collapse_empty_edges=True, ultrametricity_precision=False, ignore_root_deep_coalescences=True, **kwargs)[source]¶ A “containing tree” is a (usually rooted) tree data structure within which other trees are “contained”. For example, species trees and their contained gene trees; host trees and their contained parasite trees; biogeographical “area” trees and their contained species or taxon trees.
__init__ converts
self
to ContainingTree class, embedding the trees given in the list,contained_trees.
Mandatory Arguments:
containing_tree
 A
Tree
orTree
like object that describes the topological constraints or conditions of the containing tree (e.g., species, host, or biogeographical area trees). contained_taxon_namespace
 A
TaxonNamespace
object that will be used to manage the taxa of the contained trees. contained_to_containing_taxon_map
 A
TaxonNamespaceMapping
object mappingTaxon
objects in the containedTaxonNamespace
to correspondingTaxon
objects in the containing tree.
Optional Arguments:
contained_trees
 An iterable container of
Tree
orTree
like objects that will be contained intocontaining_tree
; e.g. gene or parasite trees. fit_containing_edge_lengths
 If
True
[default], then the branch lengths ofcontaining_tree
will be adjusted to fit the contained tree as they are added. Otherwise, the containing tree edge lengths will not be changed. collapse_empty_edges
 If
True
[default], after edge lengths are adjusted, zerolength branches will be collapsed. ultrametricity_precision
 If
False
[default], then trees will not be checked for ultrametricity. Otherwise this is the threshold within which all node to tip distances for sister nodes must be equal. ignore_root_deep_coalescences
 If
True
[default], then deep coalescences in the root will not be counted.
Other Keyword Arguments: Will be passed to Tree().

build_edge_taxa_sets
()[source]¶ Rebuilds sets of containing and corresponding contained taxa at each edge.

deep_coalescences
()[source]¶ Returns dictionary where the contained trees are keys, and the number of deep coalescences corresponding to the tree are values.

embed_contained_kingman
(edge_pop_size_attr='pop_size', default_pop_size=1, label=None, rng=None, use_expected_tmrca=False)[source]¶ Simulates, embeds, and returns a “censored” (Kingman) neutral coalescence tree conditional on self.
rng
 Random number generator to use. If
None
, the default will be used. edge_pop_size_attr
 Name of attribute of self’s edges that specify the population size. If this attribute does not exist, then the population size is taken to be 1.
Note that all edgeassociated taxon sets must be uptodate (otherwise,
build_edge_taxa_sets()
should be called).

fit_edge_lengths
(contained_trees)[source]¶ Recalculate node ages / edge lengths of containing tree to accomodate contained trees.

rebuild
(rebuild_taxa=True)[source]¶ Recalculate edge taxa sets, node ages / edge lengths of containing tree, and embed edges of contained trees.

simulate_contained_kingman
(edge_pop_size_attr='pop_size', default_pop_size=1, label=None, rng=None, use_expected_tmrca=False)[source]¶ Simulates and returns a “censored” (Kingman) neutral coalescence tree conditional on self.
rng
 Random number generator to use. If
None
, the default will be used. edge_pop_size_attr
 Name of attribute of self’s edges that specify the population size. If this attribute does not exist, then the population size is taken to be 1.
Note that all edgeassociated taxon sets must be uptodate (otherwise,
build_edge_taxa_sets()
should be called), and that the tree is not added to the set of contained trees. For the latter, callembed_contained_kingman
.

dendropy.model.reconcile.
monophyletic_partition_discordance
(tree, taxon_namespace_partition)[source]¶ Returns the number of deep coalescences on tree
tree
that would result if the taxa intax_sets
formed K mutuallyexclusive monophyletic groups, where K = len(tax_sets)taxon_namespace_partition
== TaxonNamespacePartition

dendropy.model.reconcile.
reconciliation_discordance
(gene_tree, species_tree)[source]¶ Given two trees (with splits encoded), this returns the number of gene duplications implied by the gene tree reconciled on the species tree, based on the algorithm described here:
Goodman, M. J. Czelnusiniak, G. W. Moore, A. E. RomeroHerrera, and G. Matsuda. 1979. Fitting the gene lineage into its species lineage, a parsimony strategy illustrated by cladograms constructed from globin sequences. Syst. Zool. 19: 99113.
Maddison, W. P. 1997. Gene trees in species trees. Syst. Biol. 46: 523536.
This function requires that the gene tree and species tree have the same leaf set. Note that for correct results,
 trees must be rooted (i.e., is_rooted = True)
 split masks must have been added as rooted (i.e., when encode_splits was called, is_rooted must have been set to True)