Document numpy traversals #1952

benjeffery · 2021-11-26T12:43:46Z

Added for follow up work tskit-dev/tutorials#150

codecov · 2021-11-26T13:02:48Z

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hyanwong · 2021-11-26T14:01:19Z

Yay, I was just about to do this @benjeffery but you beat me to it!

A couple of things:

you might be able to save some repetition by nuking some of the text in the descriptions of orders in the Tree.nodes() docketing, and simply pointing to these new methods, e.g.

... The available orders are:

        - 'preorder': Standard preorder traversal, see :meth:`Tree.preorder`.
        - ...

The docs don't say what we do if there are multiple roots in a tree. I think we do everything from one root, then everything from the next root, etc, but don't guarantee the order in which we iterate over the roots, right? This could also do with clarifying for e.g. inorder and levelorder in the Tree.nodes() docketing, but that's a different issue I guess.

python/tskit/trees.py

jeromekelleher

Looks good, needs some tweaks as the semantics aren't quite right.

jeromekelleher · 2021-11-26T15:10:17Z

python/tskit/trees.py

+ Also see :ref:`tutorials:sec_analysing_trees_traversals` for examples of how
+ to use traversals.
+
+ :param int u: The node to start from, defaults to the virtual root.


This isn't quite right. If we start from the virtual root we return the virtual root in the arrays, but this isn't what we usually want. It's more like "if specified, return all nodes in the subtree rooted at u (including u) in traversal order".

jeromekelleher · 2021-11-26T15:14:34Z

python/tskit/trees.py

 def preorder(self, u=NULL):
+ """
+ Returns a numpy array of node ids. Starting at `u`, yield the current node,


This isn't quite right I think. How about

Returns a number array of node ids in preorder <https://en.wikipedia.org/wiki/Tree_traversal#Pre-order_(NLR)>. If the node u the traversal is rooted at this node (and it will be the first element in the returned array). Otherwise, all nodes reachable from the tree roots will be returned. See :ref:tutorials:sec_analysing_trees_traversals for examples.

I don't think need to describe what "preorder" is, the wikipedia link is fine. I think talking about "yielding" here is more confusing, since this isn't a generator.

benjeffery · 2021-12-01T12:20:53Z

Should be good to go now

hyanwong · 2021-12-01T12:44:00Z

python/tskit/trees.py

+ <https://en.wikipedia.org/wiki/Tree_traversal##Post-order_(LRN)>. If the node u
+ is specified the traversal is rooted at this node (and it will be the first
+ element in the returned array). Otherwise, all nodes reachable from the tree
+ roots will be returned. See :ref:tutorials:sec_analysing_trees_traversals for


Does this need backticks:

:ref:`tutorials:sec_analysing_trees_traversals`

hyanwong · 2021-12-01T12:44:40Z

python/tskit/trees.py

+ <https://en.wikipedia.org/wiki/Tree_traversal#Pre-order_(NLR)>. If the node u
+ is specified the traversal is rooted at this node (and it will be the first
+ element in the returned array). Otherwise, all nodes reachable from the tree
+ roots will be returned. See :ref:tutorials:sec_analysing_trees_traversals for


Does this need backticks:

:ref:`tutorials:sec_analysing_trees_traversals`

Yes it does

hyanwong

Trivial nitpicks

hyanwong · 2021-12-01T12:51:02Z

python/tskit/trees.py

+ """
+ Returns a number array of node ids in postorder
+ <https://en.wikipedia.org/wiki/Tree_traversal##Post-order_(LRN)>. If the node u
+ is specified the traversal is rooted at this node (and it will be the first


"last element"?

hyanwong · 2021-12-01T12:56:28Z

Should be good to go now

Great. It might be good to add something about the order of traversal if there are multiple roots. Something like:

Returns a 1D numpy array of node ids in preorder
<https://en.wikipedia.org/wiki/Tree_traversal#Pre-order_(NLR)>. If the node u
is specified the traversal is rooted at this node (and it will be the first
element in the returned array). Otherwise, return an array in which the node
in preorder reachable from each tree root have been concatenated together.

but I can add that as a further PR if you like. It would be good to merge this, then I can push my doc PR properly.

python/tskit/trees.py

hyanwong

More nitpicks, sorry!

benjeffery · 2021-12-01T14:47:26Z

Thanks @hyanwong should be good now

python/tskit/trees.py

jeromekelleher · 2021-12-01T14:52:43Z

Needs another pass @benjeffery

jeromekelleher · 2021-12-01T14:54:18Z

We should discuss the semantics of the virtual root too - but, possibly simpler to merge this once the cross references have been fixed so that @hyanwong can merge in his version?

benjeffery · 2021-12-01T15:30:36Z

Fixed

benjeffery · 2021-12-01T16:33:24Z

@Mergifyio rebase

mergify · 2021-12-01T16:35:42Z

rebase

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benjeffery · 2021-12-01T16:44:16Z

Ok, hopefully that does it. FML.

hyanwong · 2021-12-01T17:44:10Z

Do you want me to merge stuff into this before it's merged into main, or simply make a follow-up PR? I've never done the former, but happy to try.

jeromekelleher · 2021-12-01T19:05:58Z

Let's do a follow-up @hyanwong

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Document numpy traversals

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Document numpy traversals #1952

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Document numpy traversals #1952

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