---
tags:
- spacy
- token-classification
language:
- he
model-index:
- name: he_ref_ner
  results:
  - task:
      name: NER
      type: token-classification
    metrics:
    - name: NER Precision
      type: precision
      value: 0.8642149929
    - name: NER Recall
      type: recall
      value: 0.7976501305
    - name: NER F Score
      type: f_score
      value: 0.8295994569
---

See below for technical details about the model.

# Description

This model is a named entity recognition model that was trained to run on text that discusses Torah topics (e.g. dvar torahs, Torah blogs, translations of classic Torah texts etc.).

It detects the following types of entities:

| Label | Description
|---|---|
| Citation | Citations to Torah texts. See notes below. |

## Notes on citation matches

- Final parentheses is not included in the match. E.g. if the citation is `בראשית (א:א)` then the final parentheses will not be included. We found that the model would get confused if the final parentheses was part of the entity. It is fairly simple to add it back in via a deterministic check.
- Only the first word of a dibur hamatchil is included in the match. E.g. `תוספות ד״ה אמר רבי עקיבא` only until the word `אמר` will be tagged. We found the model had trouble determining the end of the dibur hamatchil.
- See Ref part model for a model that can break down citations into chunks so it is simpler to parse them.

## Using with Sefaria-Project

The [Sefaria-Project](https://github.com/Sefaria/Sefaria-Project) repo can use this model to return objects linked to objects in the Sefaria database. Non-citation entities are linked to `Topic` objects and citation entities are linked to `Ref` objects.

### Configuring Sefaria-Project to use this model

The assumption is that Sefaria-Project is set up on your environment following the instructions in our [README](https://github.com/Sefaria/Sefaria-Project/blob/master/README.mkd).

In `local_settings.py`, modify the following lines:

```python
RAW_REF_MODEL_BY_LANG_FILEPATH = {
   "he": "/path/to/he-ref-ner model"
}
```

### Running the model with Sefaria-Project

The following code shows an example of instantiating the `Linker` object which uses the ML models and running the `Linker` with input.

```python
import django
django.setup()
from sefaria.model.text import library

text = "משה קבל תורה מסיני (אבות פרק א משנה א)"
linker = library.get_linker("he")
doc = linker.link(text)

print("Named entities")
for resolved_named_entity in doc.resolved_named_entities:
    print("---")
    print("Text:", resolved_named_entity.raw_entity.text)
    print("Topic Slug:", resolved_named_entity.topic.slug)

print("Citations")
for resolved_ref in doc.resolved_refs:
    print("---")
    print("Text:", resolved_ref.raw_entity.text)
    print("Ref:", resolved_ref.ref.normal())
```

# Technical Details

| Feature | Description |
| --- | --- |
| **Name** | `he_ref_ner` |
| **Version** | `1.0.0` |
| **spaCy** | `>=3.4.1,<3.5.0` |
| **Default Pipeline** | `tok2vec`, `ner` |
| **Components** | `tok2vec`, `ner` |
| **Vectors** | 391957 keys, 391957 unique vectors (50 dimensions) |
| **Sources** | n/a |
| **License** | n/a |
| **Author** | [n/a]() |

### Label Scheme

<details>

<summary>View label scheme (1 labels for 1 components)</summary>

| Component | Labels |
| --- | --- |
| **`ner`** | `מקור` |

</details>

### Accuracy

| Type | Score |
| --- | --- |
| `ENTS_F` | 82.96 |
| `ENTS_P` | 86.42 |
| `ENTS_R` | 79.77 |
| `TOK2VEC_LOSS` | 44775.36 |
| `NER_LOSS` | 4561.19 |