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Python package for sequence (e.g. trend line, sentence, image) clustering

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# TrendyPy

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TrendyPy is a small Python package for sequence clustering. It is initially developed to create time series clusters by calculating trend similarity distance with [Dynamic Time Warping](https://en.wikipedia.org/wiki/Dynamic_time_warping).

## Installation

You can install TrendyPy with pip.

```
pip install trendypy
```

TrendyPy depends on Pandas, Numpy and fastdtw and works in Python 3.7+.

## Quickstart

Trendy has scikit-learn like api to allow easy integration to existing programs. Below is a quick example to show how it clusters increasing and decreasing trends.

```python
>>> from trendypy.trendy import Trendy
>>> a = [1, 2, 3, 4, 5] # increasing trend
>>> b = [1, 2.1, 2.9, 4.4, 5.1] # increasing trend
>>> c = [6.2, 5, 4, 3, 2] # decreasing trend
>>> d = [7, 6, 5, 4, 3, 2, 1] # decreasing trend
>>> trendy = Trendy(n_clusters=2)
>>> trendy.fit([a, b, c, d])
>>> print(trendy.labels_)
[0, 0, 1, 1]
>>> trendy.predict([[0.9, 2, 3.1, 4]]) # another increasing trend
[0]

```

It can also be utilized to cluster strings by using string similarity metrics.

```python
>>> from trendypy.trendy import Trendy
>>> from trendypy.algos import levenshtein_distance
>>> company_names = [
... 	'apple inc', 
... 	'Apple Inc.', 
... 	'Microsoft Corporation', 
... 	'Microsft Corp.']
>>> trendy = Trendy(n_clusters=2, algorithm=levenshtein_distance)
>>> trendy.fit(company_names)
>>> print(trendy.labels_)
[0, 0, 1, 1]
>>> trendy.predict(['Apple'])
[0]

```

Refer to [extensive demo](https://trendypy.readthedocs.io/en/latest/source/seeinaction.html) to see it in clustering [stock trends](https://trendypy.readthedocs.io/en/latest/source/seeinaction.html#stock-data), [images](https://trendypy.readthedocs.io/en/latest/source/seeinaction.html#image-clustering) or to see how to [define your own metric](https://trendypy.readthedocs.io/en/latest/source/seeinaction.html#custom-metric) or just check [API Reference](https://trendypy.readthedocs.io/en/latest/source/api_reference.html) for details.

## Post
The idea is originated from the post [Trend Clustering](http://www.doganaskan.com/blog/posts/trendcluster.html).

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