# Russian Image-Text Retrieval Embdding with CLIP

*author: David Wang*


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## Description

This operator extracts features for image or text with [CLIP](https://arxiv.org/abs/2103.00020) which can generate embeddings for text and image by jointly training an image encoder and text encoder to maximize the cosine similarity. This is a Russian version of CLIP adopted from [ai-forever/ru-clip](https://github.com/ai-forever/ru-clip).



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## Code Example

Load an image from path './teddy.jpg' to generate an image embedding. 

Read the text 'Плюшевый мишка на скейтборде на Таймс-сквер.' to generate an text embedding. 

*Write a pipeline with explicit inputs/outputs name specifications:*

```python
import towhee

from towhee.dc2 import pipe, ops, DataCollection

img_pipe = (
    pipe.input('url')
    .map('url', 'img', ops.image_decode.cv2_rgb())
    .map('img', 'vec', ops.image_text_embedding.ru_clip(model_name='ruclip-vit-base-patch32-224', modality='image'))
    .output('img', 'vec')
)

text_pipe = (
    pipe.input('text')
    .map('text', 'vec', ops.image_text_embedding.ru_clip(model_name='ruclip-vit-base-patch32-224', modality='text'))
    .output('text', 'vec')
)

DataCollection(img_pipe('./teddy.jpg')).show()
DataCollection(text_pipe('Плюшевый мишка на скейтборде на Таймс-сквер.')).show()
```
<img src="./tabular1.png" alt="result1" style="height:60px;"/>
<img src="./tabular2.png" alt="result2" style="height:60px;"/>


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## Factory Constructor

Create the operator via the following factory method

***ru_clip(model_name, modality)***

**Parameters:**

​   ***model_name:*** *str*

​   The model name of CLIP. Supported model names: 
- ruclip-vit-base-patch32-224      
- ruclip-vit-base-patch16-224
- ruclip-vit-large-patch14-224 
- ruclip-vit-large-patch14-336
- ruclip-vit-base-patch32-384
- ruclip-vit-base-patch16-384


​   ***modality:*** *str*

​   Which modality(*image* or *text*) is used to generate the embedding. 

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## Interface

An image-text embedding operator takes a [towhee image](link/to/towhee/image/api/doc) or string as input and generate an embedding in ndarray.


**Parameters:**

​	***data:*** *towhee.types.Image (a sub-class of numpy.ndarray)*  or *str*

​  The data (image or text based on specified modality) to generate embedding.	



**Returns:** *numpy.ndarray*

​   The data embedding extracted by model.