README.md

---
title: relation_extraction
datasets:
- none
tags:
- evaluate
- metric
description: >-
  This metric is used for evaluating the F1 accuracy of input references and
  predictions.
sdk: gradio
sdk_version: 3.19.1
app_file: app.py
pinned: false
license: apache-2.0
---

# Metric Card for relation_extraction evalutation
This metric is used for evaluating the quality of relation extraction output. By calculating the Micro and Macro F1 score of every relation extraction outputs to ensure the quality.


## Metric Description
This metric can be used in relation extraction evaluation. 

## How to Use
This metric takes 2 inputs, prediction and references(ground truth). Both of them are a list of list of dictionary of entity's name and entity's type:
```python
>>> import evaluate
>>> metric_path = "Ikala-allen/relation_extraction"
>>> module = evaluate.load(metric_path)
>>> references = [
...    [
...       {"head": "phip igments", "head_type": "brand", "type": "sell", "tail": "國際認證之色乳", "tail_type": "product"},
...        {"head": "tinadaviespigments", "head_type": "brand", "type": "sell", "tail": "國際認證之色乳", "tail_type": "product"},
...    ]
... ]
>>> predictions = [
...    [
...        {"head": "phipigments", "head_type": "product", "type": "sell", "tail": "國際認證之色乳", "tail_type": "product"},
...        {"head": "tinadaviespigments", "head_type": "brand", "type": "sell", "tail": "國際認證之色乳", "tail_type": "product"},
...    ]
... ]
>>> evaluation_scores = module.compute(predictions=predictions, references=references)
>>> print(evaluation_scores)
{'sell': {'tp': 1, 'fp': 1, 'fn': 1, 'p': 50.0, 'r': 50.0, 'f1': 50.0}, 'ALL': {'tp': 1, 'fp': 1, 'fn': 1, 'p': 50.0, 'r': 50.0, 'f1': 50.0, 'Macro_f1': 50.0, 'Macro_p': 50.0, 'Macro_r': 50.0}}
```


### Inputs
- **predictions** (`list` of `list`s of `dictionary`s): relation and its type of prediction
- **references** (`list` of `list`s of `dictionary`s): references for each relation and its type.
- 
### Output Values

**output** (`dictionary` of `dictionary`s) with multiple key-value pairs
- **sell** (`dictionary`): score of type sell
  - **tp** : true positive count
  - **fp** : false positive count
  - **fn** : false negative count
  - **p** : precision
  - **r** : recall
  - **f1** : micro f1 score
- **ALL** (`dictionary`): score of all of the type (sell and belongs to)
  - **tp** : true positive count
  - **fp** : false positive count
  - **fn** : false negative count
  - **p** : precision
  - **r** : recall
  - **f1** : micro f1 score
  - **Macro_f1** : macro f1 score
  - **Macro_p** : macro precision
  - **Macro_r** : macro recall
- 
Output Example:
```python
{'sell': {'tp': 1, 'fp': 1, 'fn': 1, 'p': 50.0, 'r': 50.0, 'f1': 50.0}, 'ALL': {'tp': 1, 'fp': 1, 'fn': 1, 'p': 50.0, 'r': 50.0, 'f1': 50.0, 'Macro_f1': 50.0, 'Macro_p': 50.0, 'Macro_r': 50.0}}
```

Remind : Macro_f1、Macro_p、Macro_r、p、r、f1 are always a number between 0 and 1. And tp、fp、fn depend on how many data inputs.

### Examples
Example of only one prediction and reference:
```python
>>> metric_path = "Ikala-allen/relation_extraction"
>>> module = evaluate.load(metric_path)
>>> references = [
...    [
...       {"head": "phip igments", "head_type": "brand", "type": "sell", "tail": "國際認證之色乳", "tail_type": "product"},
...        {"head": "tinadaviespigments", "head_type": "brand", "type": "sell", "tail": "國際認證之色乳", "tail_type": "product"},
...    ]
... ]
>>> predictions = [
...    [
...        {"head": "phipigments", "head_type": "product", "type": "sell", "tail": "國際認證之色乳", "tail_type": "product"},
...        {"head": "tinadaviespigments", "head_type": "brand", "type": "sell", "tail": "國際認證之色乳", "tail_type": "product"},
...    ]
... ]
>>> evaluation_scores = module.compute(predictions=predictions, references=references)
>>> print(evaluation_scores)
{'sell': {'tp': 1, 'fp': 1, 'fn': 1, 'p': 50.0, 'r': 50.0, 'f1': 50.0}, 'ALL': {'tp': 1, 'fp': 1, 'fn': 1, 'p': 50.0, 'r': 50.0, 'f1': 50.0, 'Macro_f1': 50.0, 'Macro_p': 50.0, 'Macro_r': 50.0}}
```

Example with two or more prediction and reference:
```python
>>> metric_path = "Ikala-allen/relation_extraction"
>>> module = evaluate.load(metric_path)
>>> references = [
...     [
...         {"head": "phip igments", "head_type": "brand", "type": "sell", "tail": "國際認證之色乳", "tail_type": "product"},
...         {"head": "tinadaviespigments", "head_type": "brand", "type": "sell", "tail": "國際認證之色乳", "tail_type": "product"},
...     ],[
...           {'head': 'SABONTAIWAN', 'tail': '大馬士革玫瑰有機光燦系列', 'head_type': 'brand', 'tail_type': 'product', 'type': 'sell'}
...     ]
...   ]
>>> predictions = [
...    [
...        {"head": "phipigments", "head_type": "product", "type": "sell", "tail": "國際認證之色乳", "tail_type": "product"},
...        {"head": "tinadaviespigments", "head_type": "brand", "type": "sell", "tail": "國際認證之色乳", "tail_type": "product"},
...    ],[
...          {'head': 'SABONTAIWAN', 'tail': '大馬士革玫瑰有機光燦系列', 'head_type': 'brand', 'tail_type': 'product', 'type': 'sell'},
...          {'head': 'SNTAIWAN', 'tail': '大馬士革玫瑰有機光燦系列', 'head_type': 'brand', 'tail_type': 'product', 'type': 'sell'}  
...    ]
...  ]
>>> evaluation_scores = module.compute(predictions=predictions, references=references)  
>>> print(evaluation_scores)  
{'sell': {'tp': 2, 'fp': 2, 'fn': 1, 'p': 50.0, 'r': 66.66666666666667, 'f1': 57.142857142857146}, 'ALL': {'tp': 2, 'fp': 2, 'fn': 1, 'p': 50.0, 'r': 66.66666666666667, 'f1': 57.142857142857146, 'Macro_f1': 57.142857142857146, 'Macro_p': 50.0, 'Macro_r': 66.66666666666667}}
```

## Limitations and Bias
This metric has strict filter mechanism, if any of the prediction's entity names, such as head, head_type, type, tail, or tail_type, is not exactly the same as the reference one. It will count as fp or fn. 

## Citation
```bibtex
@Paper{
    author = {Bruno Taillé, Vincent Guigue, Geoffrey Scoutheeten, Patrick Gallinari},
    title = {Let's Stop Incorrect Comparisons in End-to-end Relation Extraction!},
    year = {2020},
}
*https://arxiv.org/abs/2009.10684*
```
## Further References
This evaluation metric implementation uses 
*https://github.com/btaille/sincere/blob/master/code/utils/evaluation.py*