DOC: Revise glossary page by bjnath · Pull Request #16996 · numpy/numpy

bjnath · 2020-08-03T17:28:31Z

Expanded and updated the Glossary page in an effort to make it more useful.

This is a starting place; I welcome the community's comments regarding clarity, choice of entries, length of definitions, technical accuracy, etc.

More clearly describe `shares_memory` as being not always *feasible* rather than *possible*

doc/source/glossary.rst

Also reworded `stride` entry for clarity, moved 'axis' entry to correct alphabetical position. Also added anchors to reference/arrays.indexing for glossary references to point to.

bjnath · 2020-08-04T16:33:54Z

Thank you, @BvB93, excellent suggestions. One goal of the rewrite was to give more visibility to the reference pages, so this is very welcome.

All suggestions incorporated as-is except for the last (#16996 (comment)) -- if the user clicks the copy link, there's only "See views."

Also clarified stride entry, fixed alphabetization of axis, and replaced two URLs with :ref: links.

BvB93 · 2020-08-04T16:52:08Z

All suggestions incorporated as-is except for the last (#16996 (comment)) -- if the user clicks the copy link, there's only "See views."

Huh, odd. Does the same issue apply to the :term:`view` references used earlier on in the document?

BvB93 · 2020-08-04T17:06:13Z

Btw, there appear to be a couple of doctest-related issues (link).
I suspect that these errors are preventing circle from rendering the updated docs.

bjnath · 2020-08-05T10:56:05Z

@BvB93

if the user clicks the copy link, there's only "See views."

Sorry, I wasn't clear. The glossary handles both copy and view in the view entry and the copy entry just says 'see view'.

As a result, there's no value in giving copy a :term: role inside the view entry, since the link points to the copy entry which just says to look at the view entry.

doc/source/glossary.rst

bjnath · 2020-08-05T12:52:33Z

We present at last https://15004-908607-gh.circle-artifacts.com/0/doc/build/html/glossary.html

doc/source/glossary.rst

WarrenWeckesser · 2020-08-05T13:12:47Z

Nice!

@WarrenWeckesser

strctured -> structured, caught by @WarrenWeckesser. Fixed missing language in `view` entry.

BvB93 · 2020-08-05T14:06:19Z

References to the old doc.glossary module will also have to be removed from certain tests (ref).

Not entirely sure though if we're allowed to straight up remove the old doc.glossary module; it is apparently part of the public API.
A second opinion would be very much appreciated here.

bjnath · 2020-08-05T14:06:31Z

@WarrenWeckesser -- Thank you!

seberg · 2020-08-05T14:20:55Z

I think we may be able to pull removal of, maybe discuss it today. But for example debian strips the whole doc module to begin with and nobody seems to have ever complained. And I guess that np.info (which can pick these up) is rarely to never used.

Also adding <BLANKLINE>s to some examples for clarity.

eric-wieser · 2020-08-05T16:27:35Z

doc/source/glossary.rst

+    array_like
+
+      Any :doc:`scalar <reference/arrays.scalars>` or
+      `sequence <https://docs.python.org/3/glossary.html#term-sequence>`_


Can be done in a follow-up, but would be nice to replace these with intersphinx links.

I wondered if there weren't a better way to handle these. I'm glad to fix it right away. What should it say?

My guess would be :term:`python:sequence` , but that's only a guess.

This is a working link, because we have an intersphinx link in conf.py:

:ref:`slice <python:glossary>`

but we want to link to the slice entry, not just the page. This gives "undefined label":

:ref:`slice <python:glossary#term-slice>`

as does this:

:ref:`slice <python:glossary:term:slice>`

When it comes to half-assed, Sphinx is without peer.

Leaving the URLs for now.

Did my approach fail?

This seems to suggest it should work: https://stackoverflow.com/q/46473481/102441

I went ahead and swapped all the explicit links using intersphinx in c24bd and 690037.

I'm against duplicating the terms from the Python glossary in NumPy's glossary, as it just leads to more clicks for the user. Nevertheless I switched them to intersphinx links in 6900372 and leave the decision whether to include them to others.

@bjnath a helpful resource for working with intersphinx is to inspect the objects.inv file, which describes the mapping from the sphinx names to URLs. It's not the most visible thing in the world, but the intersphinx docs explain how to grab objects.inv for inspection.

Did my approach fail?

The approach works as expected! I went ahead and applied it throughout.

Think I stole the half-assed prize. Sorry @eric-wieser, had the answer right in front of me. Thanks @rossbar for the fixes.

Also @rossbar thanks for the objects.inv tip.

I'll write a guide to linking for NumPy docs writers, including stuff like neps and of course this one.

bjnath · 2020-08-05T21:36:40Z

@rossbar:

I'm against duplicating the terms from the Python glossary in NumPy's glossary, as it just leads to more clicks for the user

Linking to the Python glossary alerts you that the unfamiliar term isn't NumPy, it's Python, and it takes you directly to the definition.

It's easy to imagine technical users who are new to both Python and NumPy. It's a good deed and good documentation to help them sort it out. We can do it adequately with a small number of links.

Neither of these sounds better:

Copy the Python terms into our glossary
Leave the terms out and provide no clue where to look

Also, could you help me understand this change?

DOC: rm tuple from glossary

I kept many of the Python terms from the original glossary and perhaps we don't need them all, though it's not clear what harm they do.

Why the beef with tuple? It's pervasive in NumPy and seems worth setting straight for anyone who thinks they know what it is but isn't sure.

rossbar · 2020-08-05T21:47:17Z

Neither of these sounds better:

Agreed - I would prefer that we use intersphinx for the terms where they appear. In other words, if in the documentation it says e.g. ndarray has the attribute shape, instead of linking to our glossary via ndarray has the :term:`attribute` shape, we do ndarray has the :term:`python:attribute` shape. The reason being that the former takes you to a link in the numpy glossary, which is itself a link to the Python glossary, requiring multiple clicks to get to the definition. I think it would be better if it were a single click. This should be an easy find/replace for the duplicate terms.

Also, could you help me understand this change?

It turns out there is no glossary entry for "tuple" in the Python glossary!

bjnath · 2020-08-05T22:08:02Z

Agreed - I would prefer that we use intersphinx for the terms where they appear. In other words, if in the documentation it says e.g. ndarray has the attribute shape, instead of linking to our glossary via ndarray has the :term:attribute shape, we do ndarray has the :term:python:attribute shape

Thanks for explaining this. I'd intended for them to work this way. I will fix it. But we can still keep the Python links to help people who encounter those terms in other NumPy docs.

no glossary entry for "tuple"

Two "d'ohs" in a single PR! Thanks for catching this. I did try to check the links but need to do it more effectively.

bjnath · 2020-08-05T23:38:46Z

@rossbar -- So to be clear, your wish is that when a non-glossary file has a Python :term:, it should link directly to the Python glossary rather than to ours? That would be my preference too.

A quick grep for :term: doesn't seem to turn up many, or possibly any.

Actually most of the :term: links seem silly; they're from files that themselves define the terms; visiting the glossary won't turn up anything that hasn't already been explained in the file. I'd like to fix these, but in another PR.

Since there don't seem to be many long-way-around Python links, and the existing Python links might serve a useful purpose, are you OK on leaving the Python links in the glossary?

rossbar · 2020-08-06T00:12:03Z

So to be clear, your wish is that when a non-glossary file has a Python :term:, it should link directly to the Python glossary rather than to ours?

Yes, linking directly to the relevant glossary would be preferable.

Since there don't seem to be many long-way-around Python links, and the existing Python links might serve a useful purpose, are you OK on leaving the Python links in the glossary?

I don't feel strongly about it - my main concern was with the multiple-redirection problem. If we feel it provides useful context to have stubs in the NumPy glossary to point to the Python glossary then that's fine by me!

mattip · 2020-08-12T21:06:20Z

I think we are ok with this change which will clear the test failures

--- a/numpy/tests/test_public_api.py
+++ b/numpy/tests/test_public_api.py
@@ -151,7 +151,6 @@ PUBLIC_MODULES = ['numpy.' + s for s in [
     "doc.constants",
     "doc.creation",
     "doc.dispatch",
-    "doc.glossary",
     "doc.indexing",
     "doc.internals",
     "doc.misc",

mattip · 2020-08-19T06:41:45Z

CI is passing. I think this is ready to merge.

mattip · 2020-09-16T08:56:51Z

doc/source/glossary.rst

-   type
-       In NumPy, a synonym for :term:`dtype`. For the more general Python
-       meaning, :term:`see here. <python:type>`
-


This entry has dissapeared on master, so I removed it from the PR as well. OK?

This was new content, not meant to be removed. I see I'm author again, so will fix.

mattip · 2020-09-16T09:30:08Z

Merged the master HEAD into this branch and resolved the differences.

eric-wieser · 2020-09-16T09:36:01Z

doc/source/glossary.rst

+       The result of an operation along an :term:`axis` X is an array in which X
+       disappears. This can surprise new users expecting the opposite.


This description is inaccurate:

>>> x = np.arange(12).reshape(3, 4) >>> x.shape (3, 4) >>> np.sort(x, axis=0).shape # sort along axis 0 (3, 4) # axis didn't disappear!

It would be accurate as

Suggested change

The result of an operation along an :term:`axis` X is an array in which X

disappears. This can surprise new users expecting the opposite.

The result of an reduction along an :term:`axis` X is an array in which X

disappears. This can surprise new users expecting the opposite.

but I suspect you want this glossary entry to describe the more general case.

Thanks for pointing this out. Alternative in 511d769 .

eric-wieser

Seems like the merge didn't go cleanly in a few places.

eric-wieser · 2020-09-16T09:37:09Z

doc/source/glossary.rst

+       :doc:`numpy.array <reference/generated/numpy.array>`
+       is array_like. ::
+
+           >>> a = np.array([[1, 2.0],[0, 0],(1+1j, 3.)])


PEP8

Suggested change

>>> a = np.array([[1, 2.0],[0, 0],(1+1j, 3.)])

>>> a = np.array([[1, 2.0], [0, 0], (1+1j, 3.)])

eric-wieser · 2020-09-16T09:38:07Z

doc/source/glossary.rst

-         >>> x + y
-         array([[4, 5],
-                [5, 6]])
+       Ordinarily this means the shapes of a and b must be identical. But in


Suggested change

Ordinarily this means the shapes of a and b must be identical. But in

Ordinarily, this means the shapes of a and b must be identical. But in

Sentence adverbs usually need the comma:

Frankly, that's impossible.

but in this case it's stylistic:

Ordinarily X is rational; on weekends it's irrational.
Ordinarily, X is rational; on weekends, it's irrational.

and we can imagine a single text having both:

We show that usually X is rational but on weekends it's irrational.
Usually, X is rational, but, on weekends, it is irrational. QED.

Thanks for giving me the name of this construction.

Both https://www.grammarly.com/blog/commas-after-introductory-words/ and https://theeditorsblog.net/2016/02/21/a-tale-of-adverbs-and-the-comma/ suggest that the comma should be present, so I'd err towards matching the norm rather than flouting stylistic freedom.

I wouldn't define "norms" based on what's on the internet.

The guidance given by the Grammarly program (pg88) appears to be:

Introductory clauses and long phrases must always be followed by a comma, while single words and short phrases may or may not.

The second reference doesn't seem to say anything about this case.

Neither one seems to be supporting the comma campaign.

doc/source/glossary.rst

Also added "contiguous," which is referenced in docs but hadn't been defined.

bjnath · 2020-09-17T19:57:41Z

Pushed update to address reviewer comments above. Also adds "contiguous," which had not been in the glossary but had a reference in the docs.

https://15810-908607-gh.circle-artifacts.com/0/doc/build/html/glossary.html

eric-wieser

Conflicts look resolved now, thanks.

eric-wieser · 2020-09-17T20:50:49Z

doc/source/glossary.rst

@@ -37,8 +41,8 @@ Glossary

       It can be used at most once; ``a[...,0,...]`` raises an :exc:`IndexError`.


This line needs indenting to fall inside the lost item

Thanks -- fixed in 90111e2 .

eric-wieser · 2020-09-17T20:52:02Z

doc/source/glossary.rst

+                  [ 7,  6,  5,  4],
+                  [11, 10,  9,  8]])

+       An operation "along axis 0" behaves as if the argument were an array of


This is a nice description. I think you should start with this instead of the reversing example

Good suggestion; rewritten in 90111e2 .

eric-wieser · 2020-09-17T20:53:38Z

doc/source/glossary.rst


-           [1, 4, 2, 5, 3, 6]
+   contiguous
+       An array is contiguous if it occupies a single unbroken block of memory.


Typically the requirement is stronger than this - strides must also be non-negative, with later elements appearing after earlier ones.

Thanks -- modified in 90111e2

eric-wieser · 2020-09-17T20:54:57Z

doc/source/glossary.rst

-       A :term:`structured data type` may contain a :term:`ndarray` with its
-       own dtype and shape:
+   subarray
+      An array nested in a :term:`structured data type`: ::


Suggested change

An array nested in a :term:`structured data type`: ::

An array nested in a :term:`structured data type`, as `b` is here::

The colon is added automatically by ::, no need to repeat jt

Change made in 90111e2 .

eric-wieser · 2020-09-17T20:55:55Z

doc/source/glossary.rst

+       any number of other arrays with different types, shapes, and even
+       content. This is much faster than creating those arrays.
+
+       An array created this way is a `view`, and the performance gain often


I think this will link to ndarray.view, which isn't really the right meaning.

It just shows as italic.

eric-wieser · 2020-09-17T20:57:32Z

doc/source/glossary.rst

-       every second element of another array::
+       Without changing underlying data, NumPy can make one array masquerade as
+       any number of other arrays with different types, shapes, and even
+       content. This is much faster than creating those arrays.


"content" (at least, in terms of bitpattern) is the the one thing that cant change.

I'm not sure what I was trying to convey. You're right. Changed in 90111e2 .

eric-wieser · 2020-09-17T20:59:20Z

doc/source/glossary.rst

       Used as a dimension entry, ``-1`` instructs NumPy to choose the length
       that will keep the total number of elements the same.

+           >>> np.arange(12).reshape(4,-1).shape


Suggested change

>>> np.arange(12).reshape(4,-1).shape

>>> np.arange(12).reshape(4, -1).shape

Perhaps also worth linking to the python behavior where a[-1] = a[len(a)-1], and mentioning that applies to axes not just data.

Added in 90111e2 .

I had great fun trying to get intersphinx to work on the python link. conf.py says

intersphinx_mapping = { 'python': ('https://docs.python.org/dev', None),

and calling

python -m sphinx.ext.intersphinx https://docs.python.org/dev/objects.inv

shows

std:doc faq/programming Programming FAQ : faq/programming.html

so you'd think

doc:`python:Programming FAQ`

would work. It didn't. Even if it did, it wouldn't link to the relevant entry.

Maybe I missed something. Happy to replace the URL with something Sphinx that works.

doc:`python:faq/programming` ?

Of course. It doesn't seem to work with the anchor, though, so we're torn between a politically correct link that leaves you at the top of the page or a politically incorrect link that takes you to what we want you to see.

I'm not seeing the Sphinx link you're referring to in this diff context.

Because I chose to keep the link that went directly to the entry, even though it was a URL.

Using the url looks like the right choice here, unless Sphinx has some hybrid "append this path to the base url of this intersphinx target". Avoiding urls is most important for internal links. For external ones like these, the only danger is linking to an outdated python doc version.

eric-wieser · 2020-09-17T21:00:05Z

doc/source/glossary.rst

+           array([[ 0,  1,  2,  3],
+                  [ 4,  5,  6,  7],
+                  [ 8,  9, 10, 11]])
+           <BLANKLINE>


This looks like a misuse of blankline - numpy does not emit a blank line here.

It might be misleading if the text were part of a docstring, but here it's used for formatting the documentation and is invisible to the reader.

Sorry, missed your point initially. Agreed, will change.

Removed in 90111e2 .

doc/source/glossary.rst

bjnath · 2020-09-18T15:17:44Z

Latest: https://15820-908607-gh.circle-artifacts.com/0/doc/build/html/glossary.html

bjnath · 2020-09-26T12:11:38Z

Are we ready to take the final step and merge this?

eric-wieser · 2020-09-26T12:18:18Z

doc/source/glossary.rst

         large arrays. To see the entire array, use `numpy.printoptions`


-   ``:``


Any reason for dropping the code formatting?

doc/source/glossary.rst

bjnath · 2020-09-26T12:46:07Z

@eric-wieser

Any reason for dropping the code formatting?

I'd added the styling for visibility, since the punctuation headings are hard to see. I dropped it since the new theme shrinks the code font, making the headings even harder to see.

eric-wieser · 2020-09-26T13:35:13Z

I'd added the styling for visibility, since the punctuation headings are hard to see.

Perhaps ": (symbol)"?

doc/source/glossary.rst

bjnath · 2020-09-26T15:39:20Z

I'd added the styling for visibility, since the punctuation headings are hard to see.

Perhaps ": (symbol)"?

Why not, gave it a shot.

"(symbol)" overachieves the goal of catching the eye and swallows the symbol. There's no patching up the fact that the monospaced font is too small.

I can't think of a compelling rationale for using one format or the other, so I'd like the freedom to pick whatever's easiest to see.

eric-wieser · 2020-09-26T16:00:02Z

Thanks for trying that out, I agree it looks better as is.

eric-wieser · 2020-09-26T16:01:32Z

doc/source/glossary.rst


-       **When indexing an array**, shorthand that the missing axes, if they
-       exist, are full slices.
+   . . .


Any reason for the spaces here? That's likely to frustrate users searching for ... on this page.

Suggested change

. . .

...

Legibility, of course. I thought it more likely that someone would eyeball the glossary for the ellipsis, especially since it's on top of the page, than make the effort of searching with the browser.

Sphinx search doesn't find either version.

Here's how it looks without spaces:

I think the spaces help more users than they hurt.

bjnath · 2020-09-27T17:35:26Z

Do any issues remain, or can this be merged?

mattip · 2020-09-28T20:14:56Z

Let's merge this as-is, and tweak it in subsequent PRs

mattip · 2020-09-28T20:15:14Z

Thanks @bjnath

bjnath · 2020-09-28T21:42:52Z

And thank you, @mattip, for untangling and re-threading what turned out to be a much more complicated PR than I thought. If you hadn't stepped in I'd still be looking at the pieces like a dazed Ikea purchaser. I appreciate your putting thought and effort into making this merge possible.

bjnath · 2020-09-29T10:46:39Z

And thanks also to reviewers @BvB93 , @WarrenWeckesser, @rossbar, and @eric-wieser!

bjnath added a commit to bjnath/numpy-1 that referenced this pull request Aug 3, 2020

DOC: Wording improvement in numpy#16996

8277fd1

More clearly describe `shares_memory` as being not always *feasible* rather than *possible*

bjnath added 04 - Documentation 01 - Enhancement labels Aug 3, 2020

felixdivo mentioned this pull request Aug 4, 2020

DOC: clip() allows arguments. #17002

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DOC: 6th try: Fix doctest on PR numpy#16996

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DOC: Fix typos in numpy#16996

d3e5d37

strctured -> structured, caught by @WarrenWeckesser. Fixed missing language in `view` entry.

bjnath added a commit to bjnath/numpy-1 that referenced this pull request Aug 5, 2020

DOC: Fix repeated word in PR numpy#16996

3c210b7

Also adding <BLANKLINE>s to some examples for clarity.

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DOC: Fix example formatting in PR numpy#16996

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bjnath mentioned this pull request Aug 18, 2020

DOC,MAINT: Remove numpy.doc namespace and salvage usable documentation #17095

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Merge branch 'master' into revised-glossary

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DOC: Updated for reviewer comments

511d769

Also added "contiguous," which is referenced in docs but hadn't been defined.

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bjnath added 2 commits September 18, 2020 10:02

DOC: 'Along an axis' rewrite and other reviewer changes

90111e2

DOC: Replace linked headings with explicit 'See'

563f5c2

DOC: Fix minor typos

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DOC: Italics sted monospace in PR numpy#16996

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mattip merged commit 6525ed5 into numpy:master Sep 28, 2020

		The result of an operation along an :term:`axis` X is an array in which X
		disappears. This can surprise new users expecting the opposite.

	>>> a = np.array([[1, 2.0],[0, 0],(1+1j, 3.)])
	>>> a = np.array([[1, 2.0], [0, 0], (1+1j, 3.)])

	Ordinarily this means the shapes of a and b must be identical. But in
	Ordinarily, this means the shapes of a and b must be identical. But in

		@@ -37,8 +41,8 @@ Glossary

		It can be used at most once; ``a[...,0,...]`` raises an :exc:`IndexError`.

	An array nested in a :term:`structured data type`: ::
	An array nested in a :term:`structured data type`, as `b` is here::

	>>> np.arange(12).reshape(4,-1).shape
	>>> np.arange(12).reshape(4, -1).shape

		large arrays. To see the entire array, use `numpy.printoptions`


		``:``

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