Duplicate from mikex86/stackoverflow-posts

Co-authored-by: Mike <mikex86@users.noreply.huggingface.co>

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README.md

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+---
+license: other
+language:
+- code
+- en
+task_categories:
+- question-answering
+- text-generation
+- text2text-generation
+tags:
+- code
+viewer: true
+pretty_name: StackOverflow Posts Markdown
+size_categories:
+- 10M<n<100M
+---
+
+# StackOverflow Posts Markdown
+
+![StackOverflow Logo](https://stackoverflow.design/assets/img/logos/so/logo-stackoverflow.png)
+
+
+## Dataset Summary
+
+This dataset contains all posts submitted to StackOverflow before the 14th of June 2023 formatted as **Markdown text**.<br>
+The dataset contains ~60 Million posts, totaling ~35GB in size and ~65 billion characters of text.<br>
+The data is sourced from [Internet Archive StackExchange Data Dump](https://archive.org/download/stackexchange).
+
+## Dataset Structure
+
+Each record corresponds to one post of a particular type.
+Original ordering from the data dump is not exactly preserved due to parallelism in the script used to process the data dump.
+The markdown content of each post is contained in the `Body` field. The license for a particular post is contained in the `ContentLicense` field.
+
+
+### Data Fields
+```typescript
+{
+  Id: long,
+  PostTypeId: long, // 1=Question, 2=Answer, 3=Orphaned tag wiki, 4=Tag wiki excerpt, 5=Tag wiki, 6=Moderator nomination, 7=Wiki Placeholder, 8=Privilige Wiki
+  AcceptedAnswerId: long | null, // only present if PostTypeId=1
+  ParentId: long | null, // only present if PostTypeId=2
+  Score: long,
+  ViewCount: long | null,
+  Body: string | null,
+  Title: string | null,
+  ContentLicense: string | null,
+  FavoriteCount: long | null,
+  CreationDate: string | null,
+  LastActivityDate: string | null,
+  LastEditDate: string | null,
+  LastEditorUserId: long | null,
+  OwnerUserId: long | null,
+  Tags: array<string> | null
+}
+```
+Also consider the [StackExchange Datadump Schema Documentation](https://meta.stackexchange.com/questions/2677/database-schema-documentation-for-the-public-data-dump-and-sede), as all fields
+have analogs in the original dump format.
+
+## How to use?
+
+```python
+from datasets import load_dataset
+
+# predownload full dataset
+ds = load_dataset('mikex86/stackoverflow-posts', split='train')
+
+# dataset streaming (will only download the data as needed)
+ds = load_dataset('mikex86/stackoverflow-posts', split='train', streaming=True)
+
+for sample in iter(ds): print(sample["Body"])
+```
+
+## How is the text stored?
+
+The original Data Dump formats the "Body" field as HTML, using tags such as `<code>`, `<h1>`, `<ul>`, etc.
+This HTML format has been converted to Markdown.
+
+### Markdown format
+
+For reference, [this post on StackOverflow](https://stackoverflow.com/questions/53253940/make-react-useeffect-hook-not-run-on-initial-render) is formatted as follows:
+
+#### Title: Make React useEffect hook not run on initial render
+
+```markdown
+According to the docs:
+
+​> `componentDidUpdate()` is invoked immediately after updating occurs. This method is not called for the initial render.
+
+We can use the new `useEffect()` hook to simulate `componentDidUpdate()`, but it seems like `useEffect()` is being ran after every render, even the first time. How do I get it to not run on initial render?
+
+As you can see in the example below, `componentDidUpdateFunction` is printed during the initial render but `componentDidUpdateClass` was not printed during the initial render.
+
+​`​`​`
+function ComponentDidUpdateFunction() {
+  const [count, setCount] = React.useState(0);
+  React.useEffect(() => {
+    console.log(""componentDidUpdateFunction"");
+  });
+
+  return (
+    <div>
+      <p>componentDidUpdateFunction: {count} times</p>
+      <button
+        onClick={() => {
+          setCount(count + 1);
+        }}
+      >
+        Click Me
+      </button>
+    </div>
+  );
+}
+​`​`​`
+
+rest of the post omitted for brevity
+
+```
+
+
+## Details on the HTML to Markdown conversion
+
+Using Jsoup, the original Body field was converted into a Jsoup Document. The child **nodes** (has special meaning in context of Jsoup) of this document were recursively traversed in a depth-first order.
+
+Jsoup defines `.text()` as follows:
+> ... the normalized, combined text of this element and all its children. Whitespace is normalized and trimmed. For example, given HTML <code>&lt;p&gt;Hello &lt;b&gt;there&lt;/b&gt; now! &lt;/p&gt;<code>, p.text() returns "Hello there now!"
+
+Jsoup defines a `Node` as follows:
+> The base, abstract Node model. Elements, Documents, Comments etc are all Node instances.
+
+Additionally the existence of the `TextNode` should be noted, which represents floating text inside an HTML document that is not itself an HTML element.
+Thus this text tag `<p>Hello<code>World</code></p>` would have two Jsoup child nodes `TextNode(value="Hello")` and `Element(tag="code", value="World")`.
+The value `field` of a `TextNode` contains the free standing text without any further treatment (no whitespace stripping, etc.)
+
+### Traversing Rules
+
+- When ecountering a html tag for which a rule exists, children are not further traversed, **unless explicitly stated otherwise**.
+- When encountering an `<a>` tag, `[${element.text()}](${element.attr("href")})` is emitted.
+
+- When encountering an `<h1>` tag, `\n# ${element.text()}\n\n` is emitted.
+- When encountering an `<h2>` tag, `\n## ${element.text()}\n\n` is emitted.
+- When encountering an `<h3>` tag, `\n### ${element.text()}\n\n` is emitted.
+- When encountering an `<h4>` tag, `\n#### ${element.text()}\n\n` is emitted.
+- When encountering an `<h5>` tag, `\n##### ${element.text()}\n\n` is emitted.
+- When encountering an `<h6>` tag, `\n###### ${element.text()}\n\n` is emitted.
+
+- When encountering a `<code>` tag, `` `${element.text()}` ``is emitted
+- When encountering a `<pre>` tag and said element **has** a `<code>` child tag, `` ​`​`​`\n${element.text()}`\n​`​`​`\n`` is emitted.
+- When encountering a `<pre>` tag and said element **does not** have a `<code>` child tag, **children are traversed further**.
+- When encountering an `<li>` tag, `- ` is emitted and **children are traversed further**.
+- When encountering a `<blockquote>` tag, `> ` is emitted and **children are traversed further**.
+- When encountering an `<hr>` tag, `\n---\n\n` is emitted
+- When encountering an `<img>` tag, `![${element.attr("alt")}](${element.attr("src")})` is emitted.
+- When encountering a `<table>` tag
+  - `\n| ` is emitted
+  - For each element of `element.select("th")`
+    - `${element.text()} | ` is emitted
+  - After the loop `\n| ` is emitted
+  - For each element of `element.select("th")`
+    - For each character of the `th.text()`
+      - `-` is emitted
+    - After the loop over each character of th ` | ` is emitted
+  - `\n` is emitted
+  - For each element of `element.select("tr")` with more than one children of tag type `td`
+    - `| ` is emitted
+    - For each element of `element.select("td")`
+      - `${td.text()} | ` is emitted
+    - After the loop over `<td>` elements, `\n` is emitted
+  - After the loop over `<tr>` elements, `\n` is emitted
+- When encountering a jsoup `TextNode`, `${node.attr(node.nodeName())}` (which is equivalent to accessing the private field `node.value`) is emitted.

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