Repository: numpy/numpy

Issue:
DOC: missing references when using -n in sphinx-build
Started in #13104, turned into a tracking issue here.

Turning on -n in sphinx-build results in over 1000 warnings about bad references in docs. Trying to break these down with various grep statements, it seems about 200 are from numpy.ma, about 150 from polynomial and about 150 from c:type. That is under half of the WARNINGS.

~My workflow is to cd to the `doc` directory, modify the `ALLSPHINXOPTS` in the `Makefile and add  `-n`~, My workflow is to  set an environment variable SPHINXOPTS='-n' then run
```
(cd ..; pip install .); make clean; make html 2>&1 |tee /tmp/build.txt
less /tmp/build.txt
```
and look for the most common lines. Unfortunately this takes quite a while.

Anyone who wishes to contribute can issue PRs, preferably in chunks that address one class of failure. #13104 gives an idea of the changes needed.


Discussion:
I would like to contribute to this , I am just confused about what exactly to look upon
did you try to follow the steps above? Then you should look at the lines of /tmp/build.txt that have the WARNING in them
I will like to contribute to this
Hi, I'm working on this for the warnings that are generated for functions in the polynomial submodule. This is my first time working with Sphinx, so I have a rather basic question -- which docstring should I edit? Take, for example, the following error:

`/usr/lib/python3.7/site-packages/numpy/polynomial/chebyshev.py:docstring of numpy.polynomial.chebyshev.chebdiv:29: WARNING: py:obj reference target not found: chemulx`

which is due to a typo (should be `chebmulx`). The file at `/usr/lib/python3.7/site-packages/numpy/polynomial/chebyshev.py` is read-only, so I cannot save changes. However, if I edit my local copy of the repository in `numpy/polynomial/chebyshev.py` the changes don't seem to be reflected when I re-build the docs. If you could point me on the right path I'd be really grateful, sorry for the basic question.
I'd also like to work on this issue and have the same question as mentioned by @nicholas-castro. Please kindly guide, @mattip 
You need to re-install numpy into the python that is building the documentation, so that sphinx can pick up the changes. That is why there is a `pip install .` in what I wrote above.

@parulagg27 please coordinate with @nicholas-castro so that your work does not overlap.
Note that it is sufficient to set an environment variable `SPHINXOPTS='-n'` and then generate documentation, no need to edit the `Makefile` anymore.
This is probably not fixed completely. It would be good if someone could try and paste the current status here.
Here's the current status (generated from deb79439 on 5/4/20 using @mattip's workflow from the first comment):

**Summary:** 792 total warnings
    * ~90 from `numpy.ma` docstrings
    * ~120 from `numpy.polynomial` docstrings

<details>
  <summary>Full log of link warnings</summary>

 - numpy/doc/sphinxext/doc/example.py:docstring of doc.example.foo:58: WARNING: py:obj reference target not found: otherfunc
 - numpy/doc/sphinxext/doc/example.py:docstring of doc.example.foo:61: WARNING: py:obj reference target not found: newfunc
 - numpy/doc/sphinxext/doc/example.py:docstring of doc.example.foo:63: WARNING: py:obj reference target not found: thirdfunc
 - numpy/doc/sphinxext/doc/example.py:docstring of doc.example.foo:63: WARNING: py:obj reference target not found: fourthfunc
 - numpy/doc/sphinxext/doc/example.py:docstring of doc.example.foo:63: WARNING: py:obj reference target not found: fifthfunc
 - numpy/doc/source/f2py/distutils.rst:29: WARNING: py:class reference target not found: Extension
 - numpy/doc/source/f2py/distutils.rst:40: WARNING: py:class reference target not found: Extension
 - numpy/doc/source/reference/arrays.classes.rst:481: WARNING: py:obj reference target not found: object_
 - numpy/doc/source/reference/arrays.classes.rst:481: WARNING: py:obj reference target not found: string_
 - numpy/doc/source/reference/arrays.classes.rst:481: WARNING: py:obj reference target not found: unicode_
 - numpy/doc/source/reference/arrays.classes.rst:487: WARNING: py:class reference target not found: string_
 - numpy/doc/source/reference/arrays.classes.rst:487: WARNING: py:class reference target not found: unicode_
 - numpy/doc/source/reference/arrays.classes.rst:487: WARNING: py:class reference target not found: unicode
 - numpy/doc/source/reference/arrays.classes.rst:515: WARNING: py:mod reference target not found: numpy.rec
 - numpy/doc/source/reference/arrays.dtypes.rst:44: WARNING: py:class reference target not found: void
 - numpy/doc/source/reference/arrays.dtypes.rst:81: WARNING: py:class reference target not found: int32
 - numpy/doc/source/reference/arrays.dtypes.rst:136: WARNING: py:class reference target not found: float_
 - numpy/doc/source/reference/arrays.dtypes.rst:147: WARNING: py:obj reference target not found: flexible
 - numpy/doc/source/reference/arrays.dtypes.rst:172: WARNING: py:class reference target not found: number
 - numpy/doc/source/reference/arrays.dtypes.rst:172: WARNING: py:class reference target not found: inexact
 - numpy/doc/source/reference/arrays.dtypes.rst:172: WARNING: py:class reference target not found: floating
 - numpy/doc/source/reference/arrays.dtypes.rst:173: WARNING: py:class reference target not found: complexfloating
 - numpy/doc/source/reference/arrays.dtypes.rst:173: WARNING: py:class reference target not found: cfloat
 - numpy/doc/source/reference/arrays.dtypes.rst:174: WARNING: py:class reference target not found: integer
 - numpy/doc/source/reference/arrays.dtypes.rst:174: WARNING: py:class reference target not found: signedinteger
 - numpy/doc/source/reference/arrays.dtypes.rst:174: WARNING: py:class reference target not found: int_
 - numpy/doc/source/reference/arrays.dtypes.rst:175: WARNING: py:class reference target not found: unsignedinteger
 - numpy/doc/source/reference/arrays.dtypes.rst:175: WARNING: py:class reference target not found: uint
 - numpy/doc/source/reference/arrays.dtypes.rst:176: WARNING: py:class reference target not found: character
 - numpy/doc/source/reference/arrays.dtypes.rst:176: WARNING: py:class reference target not found: string
 - numpy/doc/source/reference/arrays.dtypes.rst:177: WARNING: py:class reference target not found: flexible
 - numpy/doc/source/reference/arrays.dtypes.rst:177: WARNING: py:class reference target not found: void
 - numpy/doc/source/reference/arrays.dtypes.rst:186: WARNING: py:class reference target not found: int_
 - numpy/doc/source/reference/arrays.dtypes.rst:187: WARNING: py:class reference target not found: bool_
 - numpy/doc/source/reference/arrays.dtypes.rst:188: WARNING: py:class reference target not found: float_
 - numpy/doc/source/reference/arrays.dtypes.rst:189: WARNING: py:class reference target not found: cfloat
 - numpy/doc/source/reference/arrays.dtypes.rst:190: WARNING: py:class reference target not found: bytes_
 - numpy/doc/source/reference/arrays.dtypes.rst:191: WARNING: py:class reference target not found: str_
 - numpy/doc/source/reference/arrays.dtypes.rst:192: WARNING: py:class reference target not found: buffer
 - numpy/doc/source/reference/arrays.dtypes.rst:192: WARNING: py:class reference target not found: void
 - numpy/doc/source/reference/arrays.dtypes.rst:193: WARNING: py:class reference target not found: object_
 - numpy/doc/source/reference/arrays.dtypes.rst:259: WARNING: py:class reference target not found: void
 - numpy/doc/source/reference/arrays.dtypes.rst:314: WARNING: py:obj reference target not found: numpy.sctypeDict
 - numpy/doc/source/reference/arrays.dtypes.rst:404: WARNING: py:class reference target not found: string
 - numpy/doc/source/reference/arrays.dtypes.rst:404: WARNING: py:class reference target not found: unicode
 - numpy/doc/source/reference/arrays.indexing.rst:34: WARNING: py:const reference target not found: Ellipsis
 - numpy/doc/source/reference/arrays.indexing.rst:43: WARNING: py:const reference target not found: Ellipsis
 - numpy/doc/source/reference/arrays.indexing.rst:132: WARNING: py:const reference target not found: Ellipsis
 - numpy/doc/source/reference/arrays.indexing.rst:333: WARNING: py:const reference target not found: Ellipsis
 - numpy/doc/source/reference/arrays.indexing.rst:349: WARNING: py:class reference target not found: intp
 - numpy/doc/source/reference/arrays.indexing.rst:375: WARNING: py:const reference target not found: True
 - numpy/doc/source/reference/arrays.indexing.rst:383: WARNING: py:const reference target not found: True
 - numpy/doc/source/reference/arrays.indexing.rst:383: WARNING: py:const reference target not found: True
 - numpy/doc/source/reference/arrays.indexing.rst:383: WARNING: py:const reference target not found: False
 - numpy/doc/source/reference/arrays.interface.rst:64: WARNING: c:data reference target not found: Py_LONG_LONG
 - numpy/doc/source/reference/arrays.interface.rst:152: WARNING: py:const reference target not found: int
 - numpy/doc/source/reference/arrays.interface.rst:152: WARNING: py:const reference target not found: long
 - numpy/doc/source/reference/arrays.interface.rst:152: WARNING: c:type reference target not found: Py_LONG_LONG
 - numpy/doc/source/reference/arrays.interface.rst:181: WARNING: py:class reference target not found: buffer
 - numpy/doc/source/reference/arrays.interface.rst:202: WARNING: c:data reference target not found: voidptr
 - numpy/doc/source/reference/arrays.interface.rst:202: WARNING: c:type reference target not found: PyCObject
 - numpy/doc/source/reference/arrays.interface.rst:202: WARNING: py:obj reference target not found: __array_struct__
 - numpy/doc/source/reference/arrays.interface.rst:232: WARNING: py:const reference target not found: CONTIGUOUS
 - numpy/doc/source/reference/arrays.interface.rst:232: WARNING: py:const reference target not found: FORTRAN
 - numpy/doc/source/reference/arrays.interface.rst:232: WARNING: py:const reference target not found: ALIGNED
 - numpy/doc/source/reference/arrays.interface.rst:232: WARNING: py:const reference target not found: NOTSWAPPED
 - numpy/doc/source/reference/arrays.interface.rst:232: WARNING: py:const reference target not found: WRITEABLE
 - numpy/doc/source/reference/arrays.interface.rst:232: WARNING: py:const reference target not found: ARR_HAS_DESCR
 - numpy/doc/source/reference/arrays.interface.rst:243: WARNING: c:type reference target not found: PyCObject
 - numpy/doc/source/reference/arrays.interface.rst:243: WARNING: c:type reference target not found: PyCObject
 - numpy/doc/source/reference/arrays.interface.rst:243: WARNING: c:type reference target not found: PyCObject_FromVoidPtrAndDesc
 - numpy/doc/source/reference/arrays.ndarray.rst:4: WARNING: py:class reference target not found: ndarray
 - numpy/doc/source/reference/arrays.ndarray.rst:24: WARNING: py:class reference target not found: buffer
 - numpy/doc/source/reference/arrays.ndarray.rst:265: WARNING: py:obj reference target not found: __array_struct__
 - numpy/doc/source/reference/arrays.ndarray.rst:472: WARNING: py:func reference target not found: bool
 - numpy/doc/source/reference/arrays.ndarray.rst:607: WARNING: py:func reference target not found: int
 - numpy/doc/source/reference/arrays.ndarray.rst:607: WARNING: py:func reference target not found: float
 - numpy/doc/source/reference/arrays.ndarray.rst:607: WARNING: py:func reference target not found: complex
 - numpy/doc/source/reference/arrays.nditer.cython.rst:4: WARNING: py:class reference target not found: nditer
 - numpy/doc/source/reference/arrays.scalars.rst:25: WARNING: py:const reference target not found: True
 - numpy/doc/source/reference/arrays.scalars.rst:25: WARNING: py:const reference target not found: True
 - numpy/doc/source/reference/arrays.scalars.rst:25: WARNING: py:const reference target not found: isinstance(val, np.flexible)
 - numpy/doc/source/reference/arrays.scalars.rst:25: WARNING: py:class reference target not found: string
 - numpy/doc/source/reference/arrays.scalars.rst:25: WARNING: py:class reference target not found: unicode
 - numpy/doc/source/reference/arrays.scalars.rst:25: WARNING: py:class reference target not found: void
 - numpy/doc/source/reference/arrays.scalars.rst:38: WARNING: py:class reference target not found: intp
 - numpy/doc/source/reference/arrays.scalars.rst:38: WARNING: py:class reference target not found: uintp
 - numpy/doc/source/reference/arrays.scalars.rst:54: WARNING: py:class reference target not found: int8
 - numpy/doc/source/reference/arrays.scalars.rst:54: WARNING: py:class reference target not found: float64
 - numpy/doc/source/reference/arrays.scalars.rst:54: WARNING: py:class reference target not found: complex128
 - numpy/doc/source/reference/arrays.scalars.rst:54: WARNING: py:class reference target not found: intp
 - numpy/doc/source/reference/arrays.scalars.rst:54: WARNING: py:class reference target not found: uintp
 - numpy/doc/source/reference/arrays.scalars.rst:72: WARNING: py:class reference target not found: int_
 - numpy/doc/source/reference/arrays.scalars.rst:72: WARNING: py:class reference target not found: IntType
 - numpy/doc/source/reference/arrays.scalars.rst:73: WARNING: py:class reference target not found: float_
 - numpy/doc/source/reference/arrays.scalars.rst:73: WARNING: py:class reference target not found: FloatType
 - numpy/doc/source/reference/arrays.scalars.rst:74: WARNING: py:class reference target not found: complex_
 - numpy/doc/source/reference/arrays.scalars.rst:74: WARNING: py:class reference target not found: ComplexType
 - numpy/doc/source/reference/arrays.scalars.rst:75: WARNING: py:class reference target not found: bytes_
 - numpy/doc/source/reference/arrays.scalars.rst:75: WARNING: py:class reference target not found: BytesType
 - numpy/doc/source/reference/arrays.scalars.rst:76: WARNING: py:class reference target not found: unicode_
 - numpy/doc/source/reference/arrays.scalars.rst:76: WARNING: py:class reference target not found: UnicodeType
 - numpy/doc/source/reference/arrays.scalars.rst:78: WARNING: py:class reference target not found: bool_
 - numpy/doc/source/reference/arrays.scalars.rst:78: WARNING: py:class reference target not found: BooleanType
 - numpy/doc/source/reference/arrays.scalars.rst:78: WARNING: py:class reference target not found: BooleanType
 - numpy/doc/source/reference/arrays.scalars.rst:86: WARNING: py:class reference target not found: bool_
 - numpy/doc/source/reference/arrays.scalars.rst:86: WARNING: py:class reference target not found: int_
 - numpy/doc/source/reference/arrays.scalars.rst:86: WARNING: py:class reference target not found: bool_
 - numpy/doc/source/reference/arrays.scalars.rst:93: WARNING: py:class reference target not found: int_
 - numpy/doc/source/reference/arrays.scalars.rst:97: WARNING: py:class reference target not found: float_
 - numpy/doc/source/reference/arrays.scalars.rst:110: WARNING: py:class reference target not found: bool_
 - numpy/doc/source/reference/arrays.scalars.rst:111: WARNING: py:class reference target not found: bool8
 - numpy/doc/source/reference/arrays.scalars.rst:117: WARNING: py:class reference target not found: byte
 - numpy/doc/source/reference/arrays.scalars.rst:118: WARNING: py:class reference target not found: short
 - numpy/doc/source/reference/arrays.scalars.rst:119: WARNING: py:class reference target not found: intc
 - numpy/doc/source/reference/arrays.scalars.rst:120: WARNING: py:class reference target not found: int_
 - numpy/doc/source/reference/arrays.scalars.rst:121: WARNING: py:class reference target not found: longlong
 - numpy/doc/source/reference/arrays.scalars.rst:122: WARNING: py:class reference target not found: intp
 - numpy/doc/source/reference/arrays.scalars.rst:123: WARNING: py:class reference target not found: int8
 - numpy/doc/source/reference/arrays.scalars.rst:124: WARNING: py:class reference target not found: int16
 - numpy/doc/source/reference/arrays.scalars.rst:125: WARNING: py:class reference target not found: int32
 - numpy/doc/source/reference/arrays.scalars.rst:126: WARNING: py:class reference target not found: int64
 - numpy/doc/source/reference/arrays.scalars.rst:132: WARNING: py:class reference target not found: ubyte
 - numpy/doc/source/reference/arrays.scalars.rst:133: WARNING: py:class reference target not found: ushort
 - numpy/doc/source/reference/arrays.scalars.rst:134: WARNING: py:class reference target not found: uintc
 - numpy/doc/source/reference/arrays.scalars.rst:135: WARNING: py:class reference target not found: uint
 - numpy/doc/source/reference/arrays.scalars.rst:136: WARNING: py:class reference target not found: ulonglong
 - numpy/doc/source/reference/arrays.scalars.rst:137: WARNING: py:class reference target not found: uintp
 - numpy/doc/source/reference/arrays.scalars.rst:138: WARNING: py:class reference target not found: uint8
 - numpy/doc/source/reference/arrays.scalars.rst:139: WARNING: py:class reference target not found: uint16
 - numpy/doc/source/reference/arrays.scalars.rst:140: WARNING: py:class reference target not found: uint32
 - numpy/doc/source/reference/arrays.scalars.rst:141: WARNING: py:class reference target not found: uint64
 - numpy/doc/source/reference/arrays.scalars.rst:147: WARNING: py:class reference target not found: half
 - numpy/doc/source/reference/arrays.scalars.rst:148: WARNING: py:class reference target not found: single
 - numpy/doc/source/reference/arrays.scalars.rst:149: WARNING: py:class reference target not found: double
 - numpy/doc/source/reference/arrays.scalars.rst:150: WARNING: py:class reference target not found: float_
 - numpy/doc/source/reference/arrays.scalars.rst:151: WARNING: py:class reference target not found: longfloat
 - numpy/doc/source/reference/arrays.scalars.rst:152: WARNING: py:class reference target not found: float16
 - numpy/doc/source/reference/arrays.scalars.rst:153: WARNING: py:class reference target not found: float32
 - numpy/doc/source/reference/arrays.scalars.rst:154: WARNING: py:class reference target not found: float64
 - numpy/doc/source/reference/arrays.scalars.rst:155: WARNING: py:class reference target not found: float96
 - numpy/doc/source/reference/arrays.scalars.rst:156: WARNING: py:class reference target not found: float128
 - numpy/doc/source/reference/arrays.scalars.rst:162: WARNING: py:class reference target not found: csingle
 - numpy/doc/source/reference/arrays.scalars.rst:163: WARNING: py:class reference target not found: complex_
 - numpy/doc/source/reference/arrays.scalars.rst:164: WARNING: py:class reference target not found: clongfloat
 - numpy/doc/source/reference/arrays.scalars.rst:165: WARNING: py:class reference target not found: complex64
 - numpy/doc/source/reference/arrays.scalars.rst:166: WARNING: py:class reference target not found: complex128
 - numpy/doc/source/reference/arrays.scalars.rst:167: WARNING: py:class reference target not found: complex192
 - numpy/doc/source/reference/arrays.scalars.rst:169: WARNING: py:class reference target not found: complex256
 - numpy/doc/source/reference/arrays.scalars.rst:176: WARNING: py:class reference target not found: object_
 - numpy/doc/source/reference/arrays.scalars.rst:180: WARNING: py:class reference target not found: object_
 - numpy/doc/source/reference/arrays.scalars.rst:186: WARNING: py:class reference target not found: object_
 - numpy/doc/source/reference/arrays.scalars.rst:186: WARNING: py:class reference target not found: object_
 - numpy/doc/source/reference/arrays.scalars.rst:200: WARNING: py:class reference target not found: bytes_
 - numpy/doc/source/reference/arrays.scalars.rst:201: WARNING: py:class reference target not found: unicode_
 - numpy/doc/source/reference/arrays.scalars.rst:202: WARNING: py:class reference target not found: void
 - numpy/doc/source/reference/arrays.scalars.rst:221: WARNING: py:obj reference target not found: __array_priority__
 - numpy/doc/source/reference/c-api/array.rst:607: WARNING: py:obj reference target not found: __array_struct__
 - numpy/doc/source/reference/c-api/array.rst:813: WARNING: c:type reference target not found: op
 - numpy/doc/source/reference/c-api/array.rst:813: WARNING: c:type reference target not found: dtype
 - numpy/doc/source/reference/c-api/array.rst:813: WARNING: c:type reference target not found: context
 - numpy/doc/source/reference/c-api/array.rst:813: WARNING: c:type reference target not found: out
 - numpy/doc/source/reference/c-api/array.rst:818: WARNING: c:type reference target not found: op
 - numpy/doc/source/reference/c-api/array.rst:822: WARNING: c:type reference target not found: op
 - numpy/doc/source/reference/c-api/array.rst:822: WARNING: c:type reference target not found: cls
 - numpy/doc/source/reference/c-api/array.rst:821: WARNING: c:data reference target not found: Py{cls}ArrType_Type
 - numpy/doc/source/reference/c-api/array.rst:828: WARNING: c:type reference target not found: op
 - numpy/doc/source/reference/c-api/array.rst:825: WARNING: c:data reference target not found: PyGenericArr_Type
 - numpy/doc/source/reference/c-api/array.rst:833: WARNING: c:type reference target not found: op
 - numpy/doc/source/reference/c-api/array.rst:838: WARNING: c:type reference target not found: op
 - numpy/doc/source/reference/c-api/array.rst:844: WARNING: c:type reference target not found: op
 - numpy/doc/source/reference/c-api/array.rst:841: WARNING: c:data reference target not found: PyGenericArr_Type
 - numpy/doc/source/reference/c-api/array.rst:852: WARNING: c:type reference target not found: op
 - numpy/doc/source/reference/c-api/array.rst:847: WARNING: c:data reference target not found: PyGenericArr_Type
 - numpy/doc/source/reference/c-api/array.rst:988: WARNING: c:type reference target not found: m
 - numpy/doc/source/reference/c-api/array.rst:993: WARNING: c:type reference target not found: m
 - numpy/doc/source/reference/c-api/array.rst:1002: WARNING: c:type reference target not found: Bool
 - numpy/doc/source/reference/c-api/array.rst:1008: WARNING: c:type reference target not found: Bool
 - numpy/doc/source/reference/c-api/array.rst:1013: WARNING: c:type reference target not found: Bool
 - numpy/doc/source/reference/c-api/array.rst:1023: WARNING: c:type reference target not found: byteorder
 - numpy/doc/source/reference/c-api/array.rst:1023: WARNING: c:type reference target not found: byteorder
 - numpy/doc/source/reference/c-api/array.rst:1016: WARNING: c:data reference target not found: NPY_LITTLE
 - numpy/doc/source/reference/c-api/array.rst:1016: WARNING: c:data reference target not found: NPY_BIG
 - numpy/doc/source/reference/c-api/array.rst:1016: WARNING: c:data reference target not found: NPY_NATIVE
 - numpy/doc/source/reference/c-api/array.rst:1016: WARNING: c:data reference target not found: NPY_IGNORE
 - numpy/doc/source/reference/c-api/array.rst:1016: WARNING: c:data reference target not found: NPY_LITTLE
 - numpy/doc/source/reference/c-api/array.rst:1016: WARNING: c:data reference target not found: NPY_NATIVE
 - numpy/doc/source/reference/c-api/array.rst:1061: WARNING: c:type reference target not found: PyArray_VectorUnaryFunc
 - numpy/doc/source/reference/c-api/array.rst:1165: WARNING: c:type reference target not found: arrs
 - numpy/doc/source/reference/c-api/array.rst:1165: WARNING: c:type reference target not found: dtypes
 - numpy/doc/source/reference/c-api/array.rst:1279: WARNING: c:type reference target not found: PyArray_VectorUnaryFunc
 - numpy/doc/source/reference/c-api/array.rst:1325: WARNING: c:func reference target not found: PyArray_DECREF
 - numpy/doc/source/reference/c-api/array.rst:1335: WARNING: c:func reference target not found: PyArray_SetWritebackIfCopyBase`
 - numpy/doc/source/reference/c-api/array.rst:1542: WARNING: c:type reference target not found: flags
 - numpy/doc/source/reference/c-api/array.rst:1660: WARNING: c:type reference target not found: Bool
 - numpy/doc/source/reference/c-api/array.rst:1941: WARNING: c:type reference target not found: NPY_SEARCHSIDE
 - numpy/doc/source/reference/c-api/array.rst:1933: WARNING: c:data reference target not found: NPY_SEARCHLEFT
 - numpy/doc/source/reference/c-api/array.rst:1933: WARNING: c:data reference target not found: NPY_SEARCHRIGHT
 - numpy/doc/source/reference/c-api/array.rst:1958: WARNING: c:type reference target not found: NPY_SELECTKIND
 - numpy/doc/source/reference/c-api/array.rst:1966: WARNING: c:type reference target not found: NPY_SELECTKIND
 - numpy/doc/source/reference/c-api/array.rst:2326: WARNING: c:type reference target not found: Bool
 - numpy/doc/source/reference/c-api/array.rst:2424: WARNING: c:type reference target not found: auxdata
 - numpy/doc/source/reference/c-api/array.rst:2429: WARNING: c:type reference target not found: auxdata
 - numpy/doc/source/reference/c-api/array.rst:2810: WARNING: c:data reference target not found: NPY_IGNORE
 - numpy/doc/source/reference/c-api/array.rst:2810: WARNING: c:data reference target not found: NPY_SWAP
 - numpy/doc/source/reference/c-api/array.rst:2810: WARNING: c:data reference target not found: NPY_NATIVE
 - numpy/doc/source/reference/c-api/array.rst:2810: WARNING: c:data reference target not found: NPY_LITTLE
 - numpy/doc/source/reference/c-api/array.rst:2810: WARNING: c:data reference target not found: NPY_BIG
 - numpy/doc/source/reference/c-api/array.rst:2940: WARNING: c:data reference target not found: NPY_BEHAVED_RO
 - numpy/doc/source/reference/c-api/array.rst:2967: WARNING: c:type reference target not found: Bool
 - numpy/doc/source/reference/c-api/array.rst:2988: WARNING: c:type reference target not found: NPY_SEARCHSIDE
 - numpy/doc/source/reference/c-api/array.rst:2986: WARNING: c:data reference target not found: NPY_SEARCHLEFT
 - numpy/doc/source/reference/c-api/array.rst:2986: WARNING: c:data reference target not found: NPY_SEARCHRIGHT
 - numpy/doc/source/reference/c-api/array.rst:3114: WARNING: c:type reference target not found: static void**
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 - numpy/numpy/doc/structured_arrays.py:docstring of numpy.doc.structured_arrays:601: WARNING: py:mod reference target not found: numpy.rec
 - numpy/numpy/doc/structured_arrays.py:docstring of numpy.doc.structured_arrays:613: WARNING: py:class reference target not found: np.recarray
 - numpy/numpy/doc/structured_arrays.py:docstring of numpy.doc.structured_arrays:613: WARNING: py:class reference target not found: np.record
 - numpy/numpy/lib/recfunctions.py:docstring of numpy.lib.recfunctions.repack_fields:8: WARNING: py:obj reference target not found: np.dtype
 - numpy/numpy/lib/recfunctions.py:docstring of numpy.lib.recfunctions.structured_to_unstructured:21: WARNING: py:obj reference target not found: ndarray.astype
 - numpy/numpy/lib/recfunctions.py:docstring of numpy.lib.recfunctions.structured_to_unstructured:25: WARNING: py:obj reference target not found: ndarray.astype
 - numpy/numpy/lib/recfunctions.py:docstring of numpy.lib.recfunctions.unstructured_to_structured:29: WARNING: py:obj reference target not found: ndarray.astype
 - numpy/numpy/lib/recfunctions.py:docstring of numpy.lib.recfunctions.unstructured_to_structured:33: WARNING: py:obj reference target not found: ndarray.astype
 - numpy/doc/source/user/c-info.beyond-basics.rst:115: WARNING: c:func reference target not found: PyArray_Iter_GOTO1D
 - numpy/doc/source/user/c-info.beyond-basics.rst:162: WARNING: c:type reference target not found: PyArrayMultiObject *
 - numpy/doc/source/user/c-info.beyond-basics.rst:162: WARNING: c:func reference target not found: PyArray_MultiIter_SIZE
 - numpy/doc/source/user/c-info.beyond-basics.rst:264: WARNING: c:func reference target not found: PyArray_TypeNumFromName
 - numpy/doc/source/user/c-info.beyond-basics.rst:466: WARNING: c:func reference target not found: PyArray_FinalizeFunc
 - numpy/doc/source/user/quickstart.rst:773: WARNING: py:obj reference target not found: row_stack
 - numpy/doc/source/user/quickstart.rst:773: WARNING: py:obj reference target not found: row_stack

copying static files... ... done
copying extra files... done
dumping search index in English (code: en)... done
dumping object inventory... done
build finished with problems, 792 warnings.
make: *** [Makefile:179: html-build] Error 1

</details>

Thanks @rossbar. Okay, there's still some low-hanging fruit here. Let's leave it as a "good first issue". 

For clarity: the issue is that there are references (things with single backticks around them, i.e. ``` `somename` ```) that do not reference another function or object that can be found.

There's a couple of types of solutions:
- In some cases the intent was to _typeset as code_ rather than a reference. This is done by adding double backticks. Example; ``` `True` ``` should be ``` ``True`` ``` (or simply without backticks).
- In other cases, a reference is meant but it cannot be found. Example: the `numpy.ma.argsort` has a reference to `lexsort` in its `See Also`; there's no `numpy.ma.lexsort` so this means `numpy.lexsort`. On reflection, that link should be valid (as are many others), there may be something wrong with the lookup mechanism. IIRC the rules are that first the current scope is checked for a matching name, and then the next scope up. In SciPy this works correctly, in NumPy it does seem to - some `.. currentmodule::`'s set incorrectly perhaps?

tl;dr the "this is not a reference" is easy to fix, the other part requires knowledge of Sphinx and Numpydoc.
I would like to contribute to this issue. Is someone working on this now?
@takanori-pskq I don't think so. Please dive in, help is very welcome!
Is this issue still open ?. I want to contribute to it
@akshay-gupta123 Yes. Many broken references still remain.

Resolving patch:
diff --git a/numpy/ma/core.py b/numpy/ma/core.py
--- a/numpy/ma/core.py
+++ b/numpy/ma/core.py
@@ -5389,7 +5389,7 @@ def round(self, decimals=0, out=None):
 
         See Also
         --------
-        numpy.ndarray.around : corresponding function for ndarrays
+        numpy.ndarray.round : corresponding function for ndarrays
         numpy.around : equivalent function
         """
         result = self._data.round(decimals=decimals, out=out).view(type(self))
diff --git a/numpy/ma/extras.py b/numpy/ma/extras.py
--- a/numpy/ma/extras.py
+++ b/numpy/ma/extras.py
@@ -901,11 +901,11 @@ def compress_rows(a):
     Suppress whole rows of a 2-D array that contain masked values.
 
     This is equivalent to ``np.ma.compress_rowcols(a, 0)``, see
-    `extras.compress_rowcols` for details.
+    `compress_rowcols` for details.
 
     See Also
     --------
-    extras.compress_rowcols
+    compress_rowcols
 
     """
     a = asarray(a)
@@ -918,11 +918,11 @@ def compress_cols(a):
     Suppress whole columns of a 2-D array that contain masked values.
 
     This is equivalent to ``np.ma.compress_rowcols(a, 1)``, see
-    `extras.compress_rowcols` for details.
+    `compress_rowcols` for details.
 
     See Also
     --------
-    extras.compress_rowcols
+    compress_rowcols
 
     """
     a = asarray(a)


Test patch: