Chandan Kumar RavSinghChandan

🎙️ I explain one AI concept every day — in the simplest way possible.

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🌍 Open Source Contributions

Merged code into libraries the AI/ML world actually uses.

How It All Connects

_{Every merged PR, carried on a C₆₀ buckyball. Real geometry: 60 vertices, 90 bonds, 12 pentagons, 20 hexagons.
Spin the interactive version on my portfolio →}

175 merged pull requests across 16 libraries. Grouped by project — click any row to expand.

Library	Merged	Focus
py-pdf/pypdf `10.3k★`	76	Reader robustness, typing, spec compliance
huggingface/sentence-transformers `18.9k★`	2	Regression tests, docs
joblib/joblib `4.1k★`	3	Input validation, path handling
nltk/nltk `14.7k★`	1	Regression tests, argument validation
authlib/authlib `5.4k★`	2	OAuth correctness
fonttools/fonttools `5.3k★`	7	CFF round-trip, feaLib spec compliance
py-pdf/fpdf2 `1.5k★`	46	HTML rendering robustness
python-pillow/Pillow `13.9k★`	4	Image decoder robustness
pydantic/pydantic-extra-types `339★`	5	Validation of real-world input
neuml/txtai `13k★`	2	HTML to Markdown fidelity
kornia/kornia `11.4k★`	1	Integer-image handling in filters
tox-dev/tox `4k★`	1	Configuration correctness
lepture/mistune `3.1k★`	1	Markdown round-trip rendering
docling-project/docling-core `294★`	1	Markdown serialization correctness
mindee/doctr `6.4k★`	19	Document model robustness
adbar/trafilatura `7k★`	4	Markdown output fidelity

py-pdf/pypdf 10.3k★ — 76 merged (click to expand)

PR	Contribution
#4271	Robustness: a page labels `/Nums` entry that is not an array made `reader.page_labels` raise `TypeError`; it now warns and falls back to the page position
#4256	Robustness: an embedded file entry that is not a dictionary made `reader.attachments` raise `TypeError`; it is now reported as malformed and skipped (`PdfReadError` in strict mode)
#4232	Robustness: a `Tc`, `Tw`, `Tz`, `TL` or `Ts` operator without an operand made layout-mode `extract_text()` raise `IndexError`; the parameter now keeps its current value
#4242	Robustness: a `BT` inside a text object made layout-mode `extract_text()` print text twice or drop it; a nested `BT` now only resets the text matrix, as in plain mode
#4233	Robustness: a `TD` operator with a name instead of a number raised `TypeError` in plain and layout mode, and one with too few operands raised `IndexError` in layout mode; the leading now only changes for a number and the text is kept
#4228	Robustness: a `Tf` operator with a missing size or no operands made layout-mode `extract_text()` raise `IndexError`; the current size and a placeholder font are kept, as in plain mode
#4214	Robustness: a non-numeric operand of `Tc`, `Tw`, `Tz`, `TL`, `Ts`, `Td` or `Tm` made layout-mode `extract_text()` raise; the parameter is now left unchanged and the text kept
#4203	Robustness: a `'` or `"` operator without a string made layout-mode `extract_text()` raise; the line move is kept and only the text skipped, matching plain mode
#4186	Robustness: a name, nested array or dictionary inside a `TJ` array crashed layout-mode `extract_text()` and printed names as text; such items are now skipped
#4175	Robustness: a non-numeric operand of `Td`, `TL`, `Tz` or `Tw` made `extract_text()` raise; it is now treated as missing and the text kept
#4174	Robustness: text with a font size of 0 made layout-mode `extract_text()` divide by a zero width; the text is now extracted
#4171	Robustness: a `Tj` operator with a number instead of a string made `extract_text()` raise `TypeError`; it is now skipped and the text around it kept
#4166	Robustness: a `TJ` operator with a number instead of an array made `extract_text()` raise `TypeError`; it is now skipped and the text around it kept
#4165	Robustness: a bare `Do` operator made `extract_text()` raise `IndexError` from inside its own warning; it is now skipped and the text around it kept
#4163	Robustness: a `/FirstChar` that is null, a name or a string crashed layout-mode `extract_text()` with `TypeError`
#4155	Bug fix (6.19.0 regression): text shown before a change of direction, such as digits beside Arabic, was dropped from `extract_text()`
#4138	Robustness: a `/Font` resource that is a number, string or array crashed `extract_text()` with `TypeError`, in plain and layout mode
#4123	Bug fix: a malformed rectangle failed with a bare `AssertionError` that vanished under `python -O`; it now raises a `ValueError` naming the values
#4098	Robustness: an outline `/A` action missing the required `/S` subtype raised `KeyError`, making the whole outline unreadable
#4119	Robustness: a `/Type0` font omitting `/DescendantFonts` raised a bare `KeyError` out of `extract_text()`
#4118	Robustness: a `/Widths` entry holding a string was passed to `int()`, raising `ValueError` during text extraction
#4102	Robustness: a `/Kids` entry that is not an array crashed `reader.page_labels`
#4099	Bug fix: `add_named_destination` wrote a hardcoded `/FitH` top of 826, pointing viewers past the top of the page
#4080	Robustness: `add_outline_item` raised `UnboundLocalError` instead of naming an unsupported `page_number` type
#4074	Bug fix: a string `rect` for `add_uri` collapsed to `0`, leaving the link with no clickable area
#4069	Robustness: `insert_blank_page` looked up the size of a page that did not exist yet on an empty writer
#4064	Robustness: a malformed `/XFA` entry raised `TypeError` or `StopIteration` out of `reader.xfa`
#4058	Robustness: a font `/Encoding` whose `/Differences` is not an array crashed text extraction
#4054	Robustness: page `/Resources` that is not a dictionary crashed `extract_text()` on the `/Font` lookup
#4048	Robustness: a `/Kids` entry that is not a dictionary crashed the page tree walk
#4046	Robustness: an `/Annots` entry that is not an array crashed anything iterating `page.annotations`
#4041	Robustness: a page box that is not an array failed with an error naming neither the box nor the problem
#4039	Robustness: a name tree node whose `/Names` or `/Kids` is not an array crashed `reader.named_destinations`
#4038	Typing: `read_object` was annotated to return an `int` or `str` it can never produce, forcing six suppressions across its callers
#4031	Robustness: a form field entry that is not a dictionary crashed `reader.get_fields()`
#4030	Robustness: `/XObject` resources that are not a dictionary crashed `page.images`
#4029	Robustness: an `/AcroForm` entry that is not a dictionary crashed `reader.get_fields()`
#4023	Robustness: an `/Outlines` entry that is not a dictionary crashed `reader.outline`
#4022	Robustness: a malformed `/PageLabels` entry crashed `reader.page_labels`
#4021	Robustness: a malformed `/ViewerPreferences` entry raised `AttributeError`
#4020	Robustness: a malformed `/Dests` or `/Names` entry crashed `reader.named_destinations`
#4019	Robustness: a malformed AcroForm `/Fields` entry crashed `get_fields()`
#4018	Robustness: an outline node that is not a dictionary crashed `reader.outline`
#4017	An unknown page label style was written into `/S` and then silently dropped on read
#4016	An out-of-range page surfaced as a bare `IndexError` from the kids array
#4014	The four area and clip preferences were declared with no acceptable values, so any name passed
#4013	`/PrintPageRange` holds page pairs, so an odd-length array leaves a range without its end
#4012	`/NumCopies` accepted a negative count no reader can interpret
#4011	`/PrintScaling` was declared with an empty list of acceptable values, so nothing checked it
#4010	Bug fix: the page layout warning printed a set of an empty string and every layout run together
#4009	A page box could be set to two values but not read back, since the getter needs four
#4005	Bug fix: `number2uppercase_roman_numeral(-1)` returned `CMXCIX` instead of refusing a non-positive number
#4004	Bug fix: `PageRange("::0")` was accepted and reported valid, but the range only failed once applied
#4003	Form field flags were passed as a bare `1` where the docs point at the `FfBits` enum
#4002	Bug fix: two callers passed the raw `/Font` entry to a function reading it as a dictionary - it worked only because `IndirectObject` forwards attributes
#4000	expat passes an `int` for `is_parameter_entity` while typeshed declares a `bool` - records why the annotation stays
#3997	The docs set `annotation.flags = 4` under a comment pointing readers at `AnnotationFlag`
#3996	Bug fix: a CID font's `/W` array may hold real numbers, so a width of `443.35938` landed in a `dict[str, int]`
#3995	`XmpInformation` was typed for a `ContentStream`, a sibling of the `DecodedStreamObject` the `/Metadata` stream actually is
#3991	The annotation `border` was declared an `ArrayObject` while the documented usage is a plain list
#3990	`Fit` was typed for a tuple, but the destination builder unpacks the PDF array and hands over a list
#3989	The layout-mode extractor passes a `ChainMap` into a function annotated for two lists, behind a `type: ignore`
#3988	Both name-tree walks cast to `TreeObject` on objects that are plain dictionaries at runtime
#3986	The annotation list holds `IndirectObject` references, not the `DictionaryObject` it was declared as
#3985	Returned two empty lists from a function annotated `None`, hidden behind a `type: ignore`
#3984	Bug fix: `RectangleObject` was typed for a tuple, but every caller inside pypdf passes the `ArrayObject` read from the PDF
#3983	Bug fix: iterating a PDF dictionary yields keys, so the AcroForm font walk collected nothing — form fields inheriting a document-level font came back with an empty font set
#3972	A compressed cross-reference stream is an `EncodedStreamObject`, a sibling of the `ContentStream` it was declared as
#3971	Bug fix: a stream without an explicit `/DecodeParms` handed every filter a plain `dict`, but the decoders are typed for a `DictionaryObject`
#3970	Bug fix: the object-translation table is declared `int`-to-`int`, but each entry also stores the source document under a `"PreventGC"` key — two `type: ignore` comments hid the mismatch
#3969	Release tooling: the version bump always assumed a patch release, so enhancements had to be corrected by hand — now derived from the generated changelog sections
#3960	Bug fix: `PdfWriterProtocol` declares `_reader`, but `PdfWriter` only set it in incremental mode — so a normal writer failed the protocol it is passed as
#3957	Bug fix: `pages` was annotated `list[PageObject]` but returns a lazy `_VirtualList`, so type checkers accepted `reader.pages.append(...)` — which raises at runtime
#3943	Bug fix: an explicit `/Decode` array replaced the Adobe CMYK inversion instead of composing with it, leaving extracted images colour-inverted
#3938	Bug fix: low-bit expansion never ran for unfiltered/inline images, raising `unrecognized image mode`
#3929	Bug fix: low-bit `/DeviceRGB` images decoded as RGB instead of palette — broken image extraction

huggingface/sentence-transformers 18.9k★ — 2 merged (click to expand)

PR	Contribution
#3855	Regression tests for a core utility
#3843	Documented the sparse-tensor → SciPy COO conversion

joblib/joblib 4.1k★ — 3 merged (click to expand)

PR	Contribution
#1839	Input validation: a `pre_dispatch` below one dispatched nothing and returned no results
#1812	Bug fix: accept any `os.PathLike` in `dump()`/`load()`
#1811	Docstrings for time-format helpers

nltk/nltk 14.7k★ — 1 merged (click to expand)

PR	Contribution
#3703	Regression tests for `transitive_closure` — cycles, reflexive closure, and input-mutation safety

authlib/authlib 5.4k★ — 2 merged (click to expand)

PR	Contribution
#926	Consistency: `extract_params("")` returned `None` though the function documents `[]` for an empty string, dict or list; the empty string now matches
#919	Bug fix: the OAuth1 `InsecureTransportError` carried the OAuth2 description, telling OAuth 1.0a clients "OAuth 2 MUST utilize https." — merged by the project lead

fonttools/fonttools 5.3k★ — 7 merged (click to expand)

PR	Contribution
#4269	Bug fix: a non-ASCII OS/2 `Vendor` compiled and then crashed on save with `UnicodeEncodeError`; feaLib now rejects it with the line
#4268	Bug fix: a STAT axis location with no or too many values was skipped and crashed later with `KeyError`; feaLib now rejects it with the line
#4267	Bug fix: a name string feaLib could not encode or decode (an unpaired surrogate, an emoji in Mac Roman) raised a bare `UnicodeError`; it now raises `FeatureLibError` at the string
#4266	Bug fix: a `UnicodeRange` bit outside 0-127 passed the feaLib parser and failed later with a bare `ValueError`; it now raises `FeatureLibError` with the line
#4263	Bug fix: a `BaseScriptList` without a matching `BaseTagList` crashed feaLib with `UnboundLocalError` or a bare `ValueError`; both now raise `FeatureLibError` with the line
#4259	Bug fix: feaLib wrote a short OS/2 Vendor ID padded with NUL bytes; it is now padded with spaces as the OpenType spec requires
#4253	Bug fix: a CFF font with a non-ASCII name could be saved but not read back — the Name INDEX was decoded as ASCII while the compiler writes latin-1

py-pdf/fpdf2 1.5k★ — 46 merged (click to expand)

PR	Contribution
#2089	Robustness: `table()` with a negative `gutter_height` or `gutter_width` drew rows or columns on top of each other; it now raises a clear `ValueError`
#2088	Robustness: `text_columns()` with a negative `gutter` laid out overlapping columns printed on top of each other; it now raises a clear `ValueError`
#2083	Robustness: `set_font()` and `set_font_size()` accepted a negative size, mirroring the text and moving `multi_cell()` lines above the top margin; they now raise a clear `ValueError`
#2084	Robustness: `set_auto_page_break()` with a negative margin put the page break below the page, so the last lines before each break were lost off the page; it now raises a clear `ValueError`
#2082	Robustness: `set_stretching()` with zero or a negative value gave text no width, so justified text collapsed onto one line; it now raises a clear `ValueError`
#2079	Robustness: `set_display_mode()` wrote a negative zoom into the PDF and failed late on a non-numeric one; both now raise a clear `FPDFException`
#2078	Robustness: `table(borders_layout=...)` with an unknown value crashed with a bare `AttributeError`; it now raises its intended `ValueError`, like `cell_fill_mode` and `v_align`
#2075	Correctness: an invalid CSS color on a heading (`<h1 style="color: nope">`) crashed `write_html()`; it is now ignored with a warning, like browsers do
#2077	Robustness: a custom page format with a width or height of zero or below wrote an invalid `/MediaBox`; it now raises a clear `FPDFPageFormatException`
#2076	Robustness: `set_line_width()` accepted a negative width and wrote it into the PDF; it now raises a clear `ValueError`
#2069	Robustness: `regular_polygon()` with `numSides` below 1 silently wrote a path with no points; it now raises a clear `ValueError`
#2068	Correctness: `ink_annotation()` built the rectangle's x from the y coordinates, so `/Rect` did not enclose the drawn path and could lie outside the page; it now uses the x coordinates
#2067	Robustness: `add_page()`/`set_page_label()` with `label_start` below 1 wrote an invalid `/St` value; they now raise a clear `ValueError`
#2066	Robustness: `star()` with `corners` below 1 crashed with a `ZeroDivisionError` or silently drew nothing; it now raises a clear `ValueError`
#2063	Robustness: `text_columns()` with `ncols` below 1 crashed with a `ZeroDivisionError` or an unrelated "Not enough horizontal space" error; it now raises a clear `ValueError`
#2062	Correctness: a repeated style letter such as `style="BB"` was not recognised as bold in `set_font()`/`add_font()`; a repeated letter now means the same style
#2061	Usability: an out-of-range color component was reported as its scaled value (`1.17... not in range [0.0, 1.0]`); it is now reported as given (`300 not in range [0, 255]`)
#2060	Correctness: a hex color with non-hexadecimal characters, such as `"#GG0000"`, was silently turned into a wrong color; it now raises a clear `ValueError`
#2059	Robustness: an internal link number that `add_link()` did not return raised a bare `AssertionError`; it now raises a clear `ValueError`
#2058	Robustness: a table `colspan` below 1 crashed or broke the layout; it now spans one column, like `rowspan`
#2056	Robustness: a `table()` `text_align` tuple shorter than the columns crashed with a bare `IndexError`; it now raises a clear `ValueError` like `col_widths`
#2055	Correctness: an empty or unknown `<ul type>` raised `NotImplementedError`; it now keeps the default bullet, like browsers and like `<ol>`
#2053	Correctness: `<meta>`, `<link>`, `<col>`, `<wbr>` and the other HTML void elements produced bogus "missing end tag" warnings; they are now handled like `<br>`
#2052	Robustness: a `<table>` nested in a table cell crashed with a bare `AssertionError`; it now raises a clear `NotImplementedError` like other unsupported nested tags
#2035	Correctness: a first row giving a `width` to only some cells raised `ValueError`; the cells without one now share the rest of the table width, as browsers do (colspan and cellspacing included after review)
#2044	Correctness: the content of `<style>` and `<script>` was written into the PDF as visible text; it is now skipped, as browsers do
#2034	Browser parity: a CSS `font-size` on `<font>` with a unit (`14pt`, `12px`) was silently ignored; the unit is now read, and a bare number is still in points
#2032	Browser parity: `<li value="N">` was ignored; the item is now numbered N and the next ones continue from it, in every list type
#2031	Browser parity: `<td rowspan="99">` near the end of a table raised `Rowspan extends beyond end of table`; the rowspan now stops at the last row, as in browsers
#2009	Browser parity: `<font face="Arial, Helvetica, sans-serif">` raised `Undefined font`; the first available font is now used, keeping the PDF/A check and bold/italic
#2017	Robustness: `<table width="150%">` raised `ValueError`; the table is now fitted to the page width with a warning, and a negative width is ignored
#2013	Browser parity: `<ul type="none">` raised `NotImplementedError`; it now renders as a plain indented list with no marker
#2010	Robustness: `bgcolor="transparent"` raised `ValueError`; like browsers it is now ignored and the inherited text or row background color is kept
#2011	Robustness: `<ol type="disc">` (an unknown list type) raised `NotImplementedError`; like browsers, the list is now numbered 1, 2, 3
#2003	Robustness: `bgcolor="eeeeee"` (six hex digits without `#`, common in email HTML) raised `ValueError`; it is now read like browsers do
#2002	Robustness: `<ul type="CIRCLE">` raised `NotImplementedError`; list type keywords are now case-insensitive like in browsers
#2001	Feature gap: css `rgb(100%, 0%, 50%)` raised `ValueError` in SVG import and `write_html()`; percentages are now read and clamped to 0-100%
#2000	SVG import: a `<polygon>` / `<polyline>` with an odd number of coordinates or empty `points` raised `IndexError`; it now draws up to the first error, as the spec says
#1998	SVG import: opacity percentages (`50%`) and an out-of-range `opacity` raised `ValueError`; percentages are read and opacity is clamped to 0-1
#1997	SVG import: `fill="transparent"` and upper-case color keywords raised `ValueError`; transparent now paints nothing and keywords are case-insensitive
#1992	Robustness: an unsupported `align` on table cells (e.g. `middle`) raised `ValueError`; it is now ignored, keeping `<th>` centered
#1991	Robustness: css `rgb(...)` colors in `color` / `bgcolor` raised `ValueError`; they now reuse the existing rgb() parser
#1990	Bug fix: invalid table `colspan` / `rowspan` raised `ValueError` or `ZeroDivisionError`; spans are now read like browsers do
#1989	Feature gap: `<ul type="square">`, a standard HTML bullet type, raised `NotImplementedError`; it now renders ▪ (or the closest core-font bullet)
#1987	Bug fix: an `<ol type="a">` list with more than 26 items crashed `write_html()` with `IndexError`; markers now continue like browsers (aa, ab, ...)
#1984	Bug fix: `write_html()` raised `KeyError: 'href'` on a named anchor (`<a name="intro">`); its text is now rendered as plain text

python-pillow/Pillow 13.9k★ — 4 merged (click to expand)

PR	Contribution
#10174	Feature gap: `ImageOps.invert()`, `posterize()` and `solarize()` raised `NotImplementedError` for P images; the table is now applied to the palette, matching the RGB result
#10177	Robustness: `Exif.get_ifd()` raised `KeyError` for a missing Interop or MakerNote IFD (most images); it now returns `{}` like the other IFDs
#10173	Validation: `ImageOps.posterize()` bits outside the documented 1-8 crashed or silently returned black; it now raises `ValueError`
#10146	Robustness: a truncated or corrupt gzip FITS image raised a raw `zlib.error` or `EOFError`; both are now raised as `OSError`, which callers catch for broken images

pydantic/pydantic-extra-types 339★ — 5 merged (click to expand)

PR	Contribution
#454	Real-world input: ISO 15924 script codes rejected `latn`, `LATN` and `" Latn "`; any case and surrounding whitespace are now accepted and normalised to `Latn`
#451	Real-world input: currency, country and language codes with surrounding whitespace such as `" USD "` were rejected; ten types now strip it
#447	CSS parity: `Color("rebeccapurple")` (CSS Color Level 4) was rejected; it now parses and `as_named()` returns it
#442	Consistency: a color name with surrounding whitespace (`"red "`) was rejected while hex and `rgba()` allowed it; names now accept it too
#440	Real-world input: ISBNs written with hyphens or spaces (`978-3-16-148410-0`, as printed on books) were rejected; they are now validated like the plain digits

neuml/txtai 13k★ — 2 merged (click to expand)

PR	Contribution
#1422	Fidelity: a list inside a blockquote became `> FirstSecond` with compact HTML; it now keeps its `-` / `1.` markers, one item per line
#1408	Fidelity: paragraphs inside a blockquote were joined with no separator (`> FirstSecond`); each now starts on its own line

kornia/kornia 11.4k★ — 1 merged (click to expand)

PR	Contribution
#5946	Robustness: `unsharp_mask` raised `RuntimeError` for a uint8 image; integer images are now promoted to float32 first, like `guided_blur`

tox-dev/tox 4k★ — 1 merged (click to expand)

PR	Contribution
#4161	Correctness: `export KEY=value` in a `set_env` env file set a variable named `export KEY`; the leading `export` is now dropped, as dotenv and Docker Compose do

lepture/mistune 3.1k★ — 1 merged (click to expand)

PR	Contribution
#501	Round trip: `MarkdownRenderer` raised for the strikethrough, mark and insert plugins; it now writes them back as `~~`, `==` and `^^`, nested formatting included

docling-project/docling-core 294★ — 1 merged (click to expand)

PR	Contribution
#872	Correctness: a section header at level 6 or deeper was serialized with seven or more `#` and rendered as plain text; the Markdown serializer now caps it at six, like the HTML one caps at `<h6>`

mindee/doctr 6.4k★ — 19 merged (click to expand)

PR	Contribution
#2205	Correctness: `encode_crop` wrote a float crop with values in `[0, 1]` as an almost black image; it is now scaled to `uint8` first and gives the same bytes as the `uint8` crop
#2201	Robustness: `tensor_from_numpy` crashed on an `(H, W)` grayscale image with `uint8` or `float16`; it now gets a channel axis with every dtype, like with `float32`
#2206	Correctness: `estimate_orientation` gave a wrong angle for a float image with values in `[0, 1]`; it is now scaled to `uint8` first and gets the same angle as the `uint8` image
#2203	Robustness: `WordGenerator` accepted `min_chars > max_chars` or `min_chars < 1` and only failed while sampling; it now raises a clear `ValueError` when created
#2193	Correctness: `rotate_abs_points` and `rotate_boxes` truncated the rotation matrix to integers for integer coordinates, collapsing them; it is now built in floating point
#2191	Robustness: `crop_detection` raised `ValueError` on an image without any box; empty box arrays are now returned as is and the image is still cropped
#2202	Robustness: `Block()` and `Line([])` crashed with a bare `IndexError`; they now raise a `ValueError` saying the geometry has to be passed
#2200	Correctness: `extract_crops` gave an empty or wrong crop for a box going past the image edge; coordinates are now clamped to the image
#2199	Correctness: `remap_boxes` truncated integer boxes to zero; they are now remapped in floating point
#2198	Correctness: `polygon_patch` scaled the geometry passed to it in place, overwriting a word's relative coordinates; the patch is now built from a scaled copy
#2197	Robustness: `straighten_page` crashed on grayscale pages; `(H, W)` and `(H, W, 1)` pages are now straightened like each channel of a color page
#2195	Robustness: `rotate_image` crashed on grayscale images with `expand=True` and dropped the axis of `(H, W, 1)` images; both now rotate like each channel of a color image
#2196	Robustness: a `Block` with only artefacts got an objectness score of `NaN`, making the JSON export invalid; it now takes the confidence of its artefacts
#2194	Correctness: `nms` divided 0 by 0 for boxes without any area and suppressed them even when far apart; their overlap is now 0, like `box_iou`
#2189	Correctness: `decode_sequence` read a negative index from the end of the vocab, so the default EOS (`-1`) came back as the last character; it now raises a clear `AssertionError`
#2192	Correctness: `TableCellMetric` gave an F1 of `None` when no cell matched although recall and precision were 0, so training logged an empty dataset; the F1 is now 0
#2190	Correctness: `get_colors(161)` returned 162 colors because of a float hue step and `get_colors(0)` crashed, breaking KIE page rendering; it now returns exactly `n` colors
#2188	Correctness: `bbox_to_polygon` returned the corners crossed, giving a zero-area bow-tie polygon; they now go around the box in order
#2187	Robustness: a `Block` with artefacts but no text lines raised `IndexError` while resolving its geometry; it now uses the first artefact, which the exporters already handle

adbar/trafilatura 7k★ — 4 merged (click to expand)

PR	Contribution
#1013	Correctness: feed discovery matched `rel="alternate"` exactly, so feeds declared as `rel="Alternate"` or `rel="alternate feed"` were not found; `rel` is now read as case-insensitive keywords
#1002	Correctness: an RSS feed whose item HTML contained a `<link>` tag was read as Atom and lost all its item links; RSS-rooted feeds are now read as RSS first (linear-time root check)
#997	Correctness: an inline `<q>` was converted like a block quote and split its paragraph; it is now unwrapped, so the sentence stays in one piece
#984	Correctness: a list nested in a numbered item was indented 2 spaces, so Markdown renderers showed it as sibling items; it is now indented to the parent item's text, as CommonMark requires

> 🔄 **In review — 35 open PRs:** fpdf2 6 · typeguard 5 · doctr 3 · fonttools 3 · pikepdf 3 · evaluate 2 · joblib 2 · pypdf 2 · camelot · kokoro-onnx · mistune · narwhals · python-email-validator · python-jose · ragas · smolagents · urllib3 — [see them all](https://github.com/pulls?q=is%3Apr%20is%3Aopen%20archived%3Afalse%20author%3ARavSinghChandan%20-user%3ARavSinghChandan)

175 merged across 16 libraries the AI/ML and Python world runs on — more PRs landing over time.

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AstroIntel 360° — AI Spiritual Intelligence Platform

18+ AI agents coordinate dynamically to generate personalised structured intelligence reports across Vedic Astrology, Numerology, Palmistry, Tarot, and Vastu Shastra — in 23 Indian languages.

Bench Resource Optimizer — Enterprise AI HR Platform

Enterprise-grade AI system that maps bench employees to open roles using 5-layer Hybrid RAG — with L1+L2 semantic cache, SSE streaming, circuit breaker, and LLM-as-judge guardrails. SonarQube Quality Gate PASSED.

RunbookAI — Enterprise IT Incident Response (RAGless)

Enterprise IT incident response engine — zero vectors, zero embeddings, zero hallucinated commands. Every kubectl command is pulled verbatim from the database. Three completely separate knowledge panels ranked by priority for every incident.

Agentic Growth OS — AI Marketing Intelligence

A LangGraph pipeline where 5 specialist agents collaborate to generate and optimise marketing campaigns — with a learning engine that uses past performance data to improve the next run automatically. ROI improves run over run.

Universal Agent — Plug-and-Play AI Platform

An agent platform where any application can plug in an AI agent with just a YAML file — persona, tools, behaviour, all configured at runtime. Per-agent lock/unlock for token protection. Works with any model.

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Chandan Kumar RavSinghChandan

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🎙️ I explain one AI concept every day — in the simplest way possible.

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⚙️ Stack

🚀 Production Projects

AstroIntel 360° — AI Spiritual Intelligence Platform

Bench Resource Optimizer — Enterprise AI HR Platform

RunbookAI — Enterprise IT Incident Response (RAGless)

Agentic Growth OS — AI Marketing Intelligence

Universal Agent — Plug-and-Play AI Platform

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