# Audio Embedding with CLMR

*Author: [Jael Gu](https://github.com/jaelgu)*

<br />

## Description

The audio embedding operator converts an input audio into a dense vector which can be used to represent the audio clip's semantics.
Each vector represents for an audio clip with a fixed length of around 2s.
This operator is built on top of the original implementation of [CLMR](https://github.com/Spijkervet/CLMR).
The [default model weight](clmr_checkpoint_10000.pt) provided is pretrained on [Magnatagatune Dataset](https://paperswithcode.com/dataset/magnatagatune) with [SampleCNN](sample_cnn.py).

<br />

## Code Example

Generate embeddings for the audio "test.wav".

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

```python
from towhee import pipe, ops, DataCollection

p = (
    pipe.input('path')
        .map('path', 'frame', ops.audio_decode.ffmpeg())
        .map('frame', 'vecs', ops.audio_embedding.clmr())
        .output('path', 'vecs')
)

DataCollection(p('./test.wav')).show()
```

<img src="./result.png" width="800px"/>

<br />

## Factory Constructor

Create the operator via the following factory method

***audio_embedding.clmr(framework="pytorch")***

**Parameters:**

*framework: str*

The framework of model implementation.
Default value is "pytorch" since the model is implemented in Pytorch.

<br />

## Interface

An audio embedding operator generates vectors in numpy.ndarray given towhee audio frames.

**Parameters:**

*data: List[towhee.types.audio_frame.AudioFrame]*

Input audio data is a list of towhee audio frames.
The input data should represent for an audio longer than 3s.

**Returns**:

*numpy.ndarray*

Audio embeddings in shape (num_clips, 512).
Each embedding stands for features of an audio clip with length of 2.7s.