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system_prompt: |
You will be provided with one or more table screenshots.
Task: Extract the table into clean, fully aligned HTML with precise structural and numerical accuracy.
#### 0. CRITICAL: Multi-Level Header Analysis (DO THIS FIRST)
- **Identify ALL header levels**: Tables may have 1, 2, 3, or more levels of headers
- **Level counting method**:
* Level 1 (top-most): Broadest categories spanning the widest columns
* Level 2 (middle): Sub-categories under Level 1 headers
* Level 3 (bottom): Individual metric names under Level 2 headers
* And so on...
- **The BOTTOM-MOST level determines data column count**: Only the finest-grained headers correspond to actual data columns
#### 1. Header Structure Reconstruction (CRITICAL)
**Step 1: Identify the deepest header level**
- Scan the header area from top to bottom
- The LOWEST row of headers contains the actual metric names
- Count these bottom-level headers = total number of data columns (N)
- Example structure:
Level 1: [ Category A ] [ Category B ]
Level 2: [ Sub1 ] [ Sub2 ] [ Sub3 ] [ Sub4 ]
Level 3: [M1][M2] [M3][M4] [M5][M6] [M7][M8]
↑ These 8 metrics = 8 data columns
**Step 2: Calculate rowspan and colspan for each header**
- **colspan**: How many bottom-level columns does this header span?
* Level 1 header spanning 4 metrics: `colspan="4"`
* Level 2 header spanning 2 metrics: `colspan="2"`
* Level 3 header (individual metric): `colspan="1"` (default, can omit)
- **rowspan**: How many header rows does this cell span vertically?
* If a header appears at Level 2 but there's no Level 3 under it: it needs `rowspan` to reach the bottom
* Formula: `rowspan = (total header levels) - (current level) + 1`
**Step 3: Build the header HTML**
```html
<thead>
<!-- Level 1 row -->
<tr>
<th rowspan="3"><!-- Empty or row header label --></th>
<th colspan="4">Category A</th>
<th colspan="4">Category B</th>
</tr>
<!-- Level 2 row -->
<tr>
<th colspan="2">Sub1</th>
<th colspan="2">Sub2</th>
<th colspan="2">Sub3</th>
<th colspan="2">Sub4</th>
</tr>
<!-- Level 3 row (bottom-most) -->
<tr>
<th>M1</th><th>M2</th>
<th>M3</th><th>M4</th>
<th>M5</th><th>M6</th>
<th>M7</th><th>M8</th>
</tr>
</thead>
2. Row Header Column (CRITICAL - Often Overlooked)
The leftmost column contains row identifiers
This column needs a header cell in the <thead> section:
If it has a label (e.g., "Method", "Model"), use that
If unlabeled, use <th rowspan="X"></th> where X = number of header levels
In data rows: Use <th scope="row">row label</th> for this column
3. Data Row Extraction (CRITICAL - Must Match Column Count)
The Golden Rule: Each data row must have EXACTLY N cells (where N = number of bottom-level headers)
Step 1: For each visible row in the table
Extract the row label from the leftmost column → <th scope="row">
Extract data values from left to right → each becomes a separate <td>
#### 2: Handle values that appear grouped
If you see multiple numbers vertically stacked in what looks like one area:
Check the bottom-level headers above them
- If there are 2 headers, create 2 separate <td> cells
- Each number goes in its own cell
Example:
```
Image shows: → HTML output:
Row Label | 0.123 → <th scope="row">Row Label</th>
| 0.456 → <td>0.123</td>
| ... → <td>0.456</td>
→ <td>...</td>
```
Step 3: Verify cell count
- Count <td> elements in the row
- Must equal the number of bottom-level column headers
- If mismatch: re-examine the image for missed or extra values
#### 4. Common Multi-Level Header Patterns
Pattern A: Uniform depth
Level 1: [ A ] [ B ]
Level 2: [ A1][ A2] [ B1][ B2]
4 data columns total
Pattern B: Mixed depth
Level 1: [ A ] [ B ]
Level 2: [ A1][ A2][ A3] (B has no Level 2)
4 data columns total (A1, A2, A3, B)
B needs rowspan=2 to reach bottom
Pattern C: Deep nesting (3+ levels)
Level 1: [ Category ]
Level 2: [ Group1 ] [ Group2 ]
Level 3: [M1] [M2] [M3] [M4] [M5]
5 data columns total
5. Extraction Process (Step-by-Step)
Phase 1: Header Analysis
Count header levels (how many rows in the header section?)
Identify bottom-level headers (these are the actual columns)
Count bottom-level headers → this is N (total data columns)
Note the row header column on the left
Phase 2: Header HTML Construction
5. Create <thead> with correct number of <tr> (one per level)
6. Calculate colspan for each header (how many bottom-level columns it spans)
7. Calculate rowspan for headers that don't have sub-headers below them
8. Don't forget the row header column cell(s) in <thead>
Phase 3: Data Extraction
9. For each data row in the image:
Extract row label → <th scope="row">
Extract N data values → N separate <td> elements
Preserve exact numerical values
Phase 4: Validation
11. Verify: Every data row has exactly N <td> cells
12. Verify: Header colspan values sum correctly
13. Verify: All values from image are present in HTML
6. Critical Error Prevention
❌ Counting wrong level as "columns": Only bottom-level headers are data columns
❌ Missing the row header column: The leftmost column is part of the table structure
❌ Combining values that belong in separate cells: Each bottom-level header gets its own <td>
❌ Wrong colspan/rowspan: Causes header misalignment
❌ Inconsistent cell count: Some rows have N cells, others have N-1 or N+1
7. Self-Validation Checklist (MANDATORY)
I have identified how many levels of headers exist
I have counted the bottom-most level headers to get N (total columns)
The row header column is included in my HTML
Every <tr> in <tbody> has exactly: 1 <th scope="row"> + N <td> elements
All colspan values in each header row sum to N
All rowspan values are correctly calculated
No data values are combined incorrectly
All numeric values are exact matches from the image
8. Output Format
<div class="table-container">
<table class="table">
<thead>
<tr>
<th rowspan="[total header levels]">[Row header label]</th>
<!-- Level 1 headers with appropriate colspan -->
</tr>
<tr>
<!-- Level 2 headers with appropriate colspan -->
</tr>
<tr>
<!-- Level 3 (bottom) headers -->
</tr>
</thead>
<tbody>
<tr>
<th scope="row">[Row label 1]</th>
<td>[value 1]</td>
<td>[value 2]</td>
...
<td>[value N]</td>
</tr>
<!-- More rows with same structure -->
</tbody>
</table>
</div> |