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A fast, scalable and light-weight C++ Fréchet and DTW distance library, exposed to python and focused on clustering of polygonal curves.

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# Fred ![alt text](https://raw.githubusercontent.com/derohde/Fred/master/logo/logo.png "Fred logo")
A fast, scalable and light-weight C++ Fréchet and DTW distance library, exposed to python and focused on clustering of polygonal curves.

### DISTANCE FUNCTION FOR CLUSTERING CAN BE CHOSEN (heuristic in case of DTW)
### CURVE AND CURVES CAN NOW BE PICKLED

## Ingredients
`import Fred as fred`

- for verbosity, set `fred.config.verbosity`, default is `0`, possible values `0,1,2,3`

### Number of Threads

By default, Fred will automatically determine the number of threads to use. If you want to set an upper limit, set `fred.config.number_threads`. Set to `-1` to enable dynamic mode again.

### Curve
- signature: `fred.Curve(np.ndarray)`, `fred.Curve(np.ndarray, str name)`
- properties: `fred.Curve.values`: curves as `np.ndarray`, `fred.Curve.name`: get name of curve, `fred.Curve.dimensions`: dimension of curve, `fred.Curve.complexity`: number of points of curve

### Curves
- signature: `fred.Curves()`
- methods: `fred.Curves.add(curve)`: add curve, `fred.Curves[i]`: get ith curve, `len(fred.Curves)`: number curves, `fred.Curves + fred.Curves`: add two sets of curves,  `fred.Curves.simplify(l)`: return set of simplified curves
- properties:  `fred.Curves.m`: maximum complexity of the contained curves, `fred.Curves.values`: curves as `np.ndarray`

#### continous Fréchet distance
- signature: `fred.continuous_frechet(curve1, curve2)`
- returns: `fred.Continuous_Frechet_Result` with members `value`, `time_bounds`: running-time for upper and lower bound, `number_searches`: number of free space diagrams built, `time_searches`: running-time for free spaces

###### continuous Fréchet distance config
- approximation error in percent of distance: `fred.config.continuous_frechet_error`, which defaults to 1

#### discrete Fréchet distance
- signature: `fred.discrete_frechet(curve1, curve2)`
- returns: `fred.Discrete_Frechet_Result` with members `value` and `time`

#### discrete dynamic time warping distance
- signature: `fred.discrete_dynamic_time_warping(curve1, curve2)`
- returns: `fred.Discrete_Dynamic_Time_Warping_Distance` with members `value` and `time`

### Curve Simplification

All simplifications are vertex-restricted!

#### Frechet distance

##### minimum error simplification
- graph approach from [**Polygonal Approximations of a Curve — Formulations and Algorithms**](https://www.sciencedirect.com/science/article/pii/B9780444704672500114)
- signature: `fred.frechet_minimum_error_simplification(fred.Curve, int complexity)`
- returns: `fred.Curve`that uses input curves vertices, with `complexity` number of vertices and that has minimum distance to input curve

##### approximate minimum link simplification
- algorithm "FS" from [**Near-Linear Time Approximation Algorithms for Curve Simplification**](https://link.springer.com/article/10.1007/s00453-005-1165-y)
- signature: `fred.frechet_approximate_minimum_link_simplification(fred.Curve, double error)`
- returns: `fred.Curve` that uses input curves vertices, is of small complexity and with distance to input curve at most `error`

##### approximate minimum error simplification
- binary search on `fred.frechet_approximate_minimum_link_simplification`
- signature: `fred.frechet_approximate_minimum_error_simplification(fred.Curve, int complexity)`
- returns: `fred.Curve`that uses input curves vertices, with `complexity` number of vertices and that has small distance to input curve

#### Dynamic Time Warping

##### approximate minimum error simplification
- approach from [**Approximating Length-Restricted Means Under Dynamic Time Warping**](https://link.springer.com/chapter/10.1007/978-3-031-18367-6_12)
- signature: `fred.dtw_approximate_minimum_error_simplification(fred.Curve, int complexity)`
- returns: `fred.Curve`that uses input curves vertices, with `complexity` number of vertices and that has small distance to input curve

### Clustering

#### Distance storing

- Set `fred.config.use_distance_matrix` to `False` if already computed distances should not be stored. This makes sense for massive data sets, especially when so much memory is consumed that the OS kills the process.

#### Underlying distance function

The parameter `distance_func` controls which distance function to use. Possible values:
- `0`: continuous Fréchet distance
- `1`: discrete Fréchet distance
- `2`: discrete dynamic time warping distance (algorithms are then of heuristic nature)

#### Consecutive call option

The parameter `consecutive_call` controls whether distances and simplifications already computed in a previous clustering call are resused (set to `true` then); defaults to `false`.
Has no effect when `fred.config.use_distance_matrix == False`.

#### discrete (k,l)-center clustering (continuous Fréchet)
- from [**Approximating (k,l)-center clustering for curves**](https://dl.acm.org/doi/10.5555/3310435.3310616)
- signature: `fred.discrete_klcenter(int k, int l, fred.Curves, bool local_search, bool consecutive_call, bool random_first_center, bool fast_simplification, int distance_func)` with parameters 
    - `k`: number of centers
    - `l`: maximum complexity of the centers
    - `local_search`: number of iterations of local search to improve solution, defaults to `0`
    - `random_first_center`: determines if first center is chosen uniformly at random or first curve is used as first center, optional, defaults to true
    - `fast_simplification`: determines whether to use the minimum error simplification or the faster approximate minimum error simplification, defaults to `false`
- returns: `fred.Clustering_Result` with mebers 
    - `value`: objective value 
    - `time`: running-time 
    - `assignment`: empty if compute_assignment has not been called

#### discrete (k,l)-median clustering (continuous Fréchet)
- Algorithm from section 4.3 in [**Geometric Approximation Algorithms**](http://www.ams.org/books/surv/173/) + simplification
- signature: `fred.discrete_klmedian(int k, int l, fred.Curves, bool consecutive_call, bool fast_simplification, int distance_func)` with parameters 
    - `k`: number of centers
    - `l`: maximum complexity of the centers
    - `fast_simplification`: determines whether to use the minimum error simplification or the faster approximate minimum error simplification, defaults to `false`
- returns: `fred.Clustering_Result` with mebers 
    - `value`: objective value 
    - `time`: running-time 
    - `assignment`: empty if compute_assignment has not been called

#### Clustering Result
- signature: `fred.Clustering_Result`
- methods: 
    - `len(fred.Clustering_Result)`: number of centers
    - `fred.Clustering_Result[i]`: get ith center
    - `fred.Clustering_Result.compute_assignment(fred.Curves, bool consecutive_call)`: assigns every curve to its nearest center with parameter `consecutive_call`, which defaults to `false`; set to true, if you want to assign the curves used for clustering
    - `fred.Clustering_Result.optimize(fred.Curves, bool consecutive_call)`: (heuristically) optimizes cluster centers using a [stabbing algorithm](https://arxiv.org/abs/2212.01458)
- members: 
    - `value`: objective value
    - `time`: running-time
    - `assignment`: empty if compute_assignment was not called

#### Cluster Assignment
- signature: `fred.Cluster_Assignment`
- methods: 
    - `len(fred.Cluster_Assignment)`: number of centers
    - `fred.Cluster_Assignment.count(i)`: number of curves assigned to center `i`
    - `fred.Cluster_Assignment.get(i,j)`: get index of `j`th curve assigned to center `i`
    - `fred.Cluster_Assignment.distance(i,j)`: get distance of `j`th curve assigned to center `i` to center `i`

### Dimension Reduction via Gaussian Random Projection 
- [Section 2 in **Random Projections and Sampling Algorithms for Clustering of High Dimensional Polygonal Curves**](https://papers.nips.cc/paper/9443-random-projections-and-sampling-algorithms-for-clustering-of-high-dimensional-polygonal-curves)
- signature: `fred.dimension_reduction(curves, epsilon, empirical_constant)` with parameters `epsilon`: (1+epsilon) approximation parameter, `empirical_constant`: use constant of empirical study (faster, but less accurate), defaults to `True`
- returns: `fred.Curves` collection of curves
  
## Installation

### Requirements

You have to have installed:
 - C++ compiler
 - CMake
 - git
 - optional: openmp available (should be a part of your compiler)
 
That's it!

#### Installing on Windows

It's best to use the [Ubuntu subsystem](https://ubuntu.com/wsl), which is easy to install through powershell. Once you have this installed, follow this procedure:
```bash
sudo apt update 
sudo apt upgrade
sudo apt install python3-pip cmake git gcc
pip3 install --user fred-frechet
```

#### Installing on Mac

Apple's clang does not really support openmp, which is now kind of an integral part of Fred. You can try to install libomp via homebrew, but the best way would be to get a virtual ubuntu running.
Fred does install out of the box on Mac though, but without omp support.

### Linux/Unix Installation Procedure

- Variant 1: simply run `pip install Fred-Frechet`
 - Variant 2: clone repository and run `make` for installation into userdir

## Test
Just run `python py/test.py`.
  
## Mini Example
```python
import Fred as fred
import numpy as np
import pandas as pd

curve1d = fred.Curve([1., 2.]) # Curve stores a polygonal curve with 
                                         # at least two points of at least one 
                                         # and equal number of dimensions

curve2d1 = fred.Curve([[1., 0.], [2., 1.], [3., 0.]]) # any number of dimensions and points works
curve2d2 = fred.Curve([[1., -1.], [2., -2.], [3., -1.]], "optional name, e.g. displayed in plot")

print(curve2d1)

fred.plot_curve(curve2d1, curve2d2)
fred.plot_curve(curve2d2, fred.frechet_minimum_error_simplification(curve2d2, 2))

print("distance is {}".format(fred.continuous_frechet(curve2d1, curve2d2).value))

print("download HUGE curves")

import requests, zipfile, io             # you can use all libraries 
                                         # that work with numpy to read data into fred

re = requests.get("https://archive.ics.uci.edu/ml/machine-learning-databases/00447/data.zip", stream=True)
zf = zipfile.ZipFile(io.BytesIO(re.content))

ps1 = fred.Curve(pd.read_csv(zf.open('PS1.txt'), delimiter="\t", header=None).values[:50], "PS1")
ps2 = fred.Curve(pd.read_csv(zf.open('PS2.txt'), delimiter="\t", header=None).values[:50], "PS2")
ps3 = fred.Curve(pd.read_csv(zf.open('PS3.txt'), delimiter="\t", header=None).values[:50], "PS3")
ps4 = fred.Curve(pd.read_csv(zf.open('PS4.txt'), delimiter="\t", header=None).values[:50], "PS4")
ps5 = fred.Curve(pd.read_csv(zf.open('PS5.txt'), delimiter="\t", header=None).values[:50], "PS5")
ps6 = fred.Curve(pd.read_csv(zf.open('PS6.txt'), delimiter="\t", header=None).values[:50], "PS6")

curves = fred.Curves() # for clustering or if you want to apply dimension reduction
                       # you need to encapsulate your curves in a Curves object
              
curves.add(ps1)
curves.add(ps2)
curves.add(ps3)
curves.add(ps4)
curves.add(ps5)
curves.add(ps6)

fred.plot_curve(curves)

curves = fred.dimension_reduction(curves, 0.95) # fred is pretty fast but with high dimensional data
                                                # a dimension reduction massively improves running-time
                                                # even for smaller values of epsilon
                                                
fred.plot_curve(curves)

# Oneshot clustering - if you already know the value of k

clustering = fred.discrete_klcenter(2, 10, curves) # fast but coarse

clustering = fred.discrete_klmedian(2, 10, curves) # slow but better results

print("clustering cost is {}".format(clustering.value))

for i, center in enumerate(clustering):
    print(f"center {i} is {center}")

fred.plot_curve(clustering)

# Multiple clustering calls - if you need to find a suitable value for k

for k in range(2, 6):
    
    clustering = fred.discrete_klcenter(k, 10, curves, consecutive_call=True)
    print(f"clustering cost is {clustering.value}")
    
    clustering = fred.discrete_klmedian(k, 10, curves, consecutive_call=True)
    print(f"clustering cost is {clustering.value}")

clustering.compute_assignment(curves, consecutive_call=True) # use consecutive_call = False when computing assignment for curves other
                                                             # than those used for computing the clustering

for i in range(len(clustering)):
    for j in range(clustering.assignment.count(i)):
        print(f"{curves[clustering.assignment.get(i,j)].name} was assigned to center {clustering[i].name}")

clustering.optimize_centers(curves, consecutive_call = True) # uses stabbing to get better centers

fred.plot_clustering(clustering, curves)

```
## Visual Example

```python

distance_func = 0 # try 2 for DTW

import Fred as fred

curves = fred.Curves()
curves.add(fred.Curve([[-10.93943942, -37.06242838],[-10.93944232, -37.06256992],[-10.93944232, -37.06256992],[-10.93944232, -37.06256992],[-10.93899402, -37.06280406],[-10.93860314, -37.06296434],[-10.93835807, -37.06278978],[-10.93829299, -37.06237239],[-10.93854427, -37.06176238],[-10.93889765, -37.06105771],[-10.9392863 , -37.06034013],[-10.93958482, -37.0597757 ],[-10.93981259, -37.05935465],[-10.94003912, -37.0589944 ],[-10.94029375, -37.05890855],[-10.94044568, -37.05899324],[-10.94071019, -37.05920933],[-10.94091498, -37.05938079],[-10.94092187, -37.05938262],[-10.94111489, -37.05955812],[-10.94143233, -37.05984643],[-10.94189287, -37.06029526],[-10.94234691, -37.06074624],[-10.9425804 , -37.06096802],[-10.94263953, -37.06101946],[-10.94263953, -37.06101946],[-10.94263953, -37.06101946],[-10.94266097, -37.0610417 ],[-10.94286097, -37.0612328 ],[-10.94315305, -37.06155233],[-10.94350765, -37.06192153],[-10.94410138, -37.0621534 ],[-10.94468481, -37.06230469],[-10.94527759, -37.06251654],[-10.94594673, -37.06281271],[-10.94671859, -37.06308869],[-10.94730157, -37.06335312],[-10.94778644, -37.06381369],[-10.94844587, -37.06445785],[-10.94904832, -37.06500803],[-10.94979403, -37.06571115],[-10.9504376 , -37.06632879],[-10.95101859, -37.06687168],[-10.95164801, -37.06724984],[-10.95194617, -37.06738994],[-10.95245685, -37.06766077],[-10.95311692, -37.06801289],[-10.95373597, -37.06834647],[-10.95425643, -37.06861906],[-10.95456037, -37.06876904],[-10.9551056 , -37.06906634],[-10.95571837, -37.06937444],[-10.95645998, -37.06951516],[-10.95722549, -37.06945968],[-10.9582645 , -37.06937347],[-10.959267  , -37.06930038],[-10.96033403, -37.06924749],[-10.9616459 , -37.069179  ],[-10.96270941, -37.06910438],[-10.96397319, -37.06903497],[-10.96497853, -37.06897429],[-10.9656844 , -37.06850669],[-10.96592044, -37.06768898],[-10.96610809, -37.06688631],[-10.96630181, -37.06600845],[-10.96646721, -37.06534033],[-10.96698213, -37.06499147],[-10.96764198, -37.06528425],[-10.96814327, -37.06557494],[-10.9687186 , -37.06599832],[-10.96927369, -37.0664603 ],[-10.96945204, -37.06660118],[-10.96959754, -37.06671691],[-10.96985275, -37.0669367 ],[-10.97016947, -37.0671957 ],[-10.97041451, -37.06739896],[-10.97048234, -37.06735379],[-10.97032484, -37.06715337],[-10.97020309, -37.06704726],[-10.97024076, -37.066873  ],[-10.97046391, -37.0665994 ],[-10.97074272, -37.06632107],[-10.97105451, -37.06647656],[-10.97140669, -37.06677885],[-10.97186827, -37.06717748],[-10.97201951, -37.06732553],[-10.97215358, -37.06744312],[-10.9723854 , -37.06761853],[-10.97258704, -37.06777718],[-10.97286671, -37.067999  ],[-10.97318196, -37.06824471],[-10.97329008, -37.06835596],[-10.97331396, -37.0683913 ],[-10.97331396, -37.0683913 ],[-10.97340625, -37.06848176],[-10.97355518, -37.06857843],[-10.97388026, -37.06881238],[-10.97409123, -37.06894244],[-10.97418474, -37.06886148],[-10.97428593, -37.0687222 ],[-10.97436295, -37.06863122],[-10.97442223, -37.06855982],[-10.97447997, -37.06848969],[-10.97454607, -37.06841423],[-10.97467334, -37.06824215],[-10.97479694, -37.06806764],[-10.97487819, -37.06798559],[-10.97494334, -37.06790972],[-10.97494334, -37.06790972],[-10.97496155, -37.06788944],[-10.97496155, -37.06788944],[-10.97496155, -37.06788944],[-10.97496155, -37.06788944]]))
curves.add(fred.Curve([[-10.90889296, -37.05237154],[-10.90904785, -37.05260632],[-10.90973536, -37.05266121],[-10.91010518, -37.05261827],[-10.91000414, -37.05256681],[-10.91048646, -37.05260013],[-10.91135943, -37.05269498],[-10.91229152, -37.05277322],[-10.91342033, -37.05270886],[-10.91431659, -37.05278532],[-10.91506897, -37.05266128],[-10.91544909, -37.05242861],[-10.91593664, -37.05267365],[-10.91667623, -37.05265982],[-10.91748816, -37.05281022],[-10.91801454, -37.05269153],[-10.91787201, -37.05279041],[-10.91785134, -37.05282591],[-10.91792023, -37.052902  ],[-10.91837675, -37.05296211],[-10.91850017, -37.0533763 ],[-10.91849212, -37.05358395],[-10.91849799, -37.05357595],[-10.9184368 , -37.05413224],[-10.91850316, -37.05443409],[-10.91850858, -37.05446375],[-10.9185052 , -37.05446315],[-10.91839066, -37.05517003],[-10.91841456, -37.05612296],[-10.9185024 , -37.05687158],[-10.9181955 , -37.05773603],[-10.91861413, -37.05873733],[-10.91855651, -37.05895014],[-10.91835643, -37.05889317],[-10.91854341, -37.05965251],[-10.91848843, -37.06081932],[-10.91843979, -37.06219825],[-10.91841746, -37.06266105],[-10.91837862, -37.06279615],[-10.91831496, -37.06300964],[-10.9183473 , -37.06299321],[-10.91837899, -37.06298774],[-10.91837791, -37.06298758],[-10.918378  , -37.06298698],[-10.91837822, -37.06298652],[-10.91841453, -37.06321011],[-10.91847828, -37.06394916],[-10.91861829, -37.06397188],[-10.91861297, -37.06398652],[-10.91861178, -37.06398627],[-10.91861355, -37.06398464],[-10.91861037, -37.06398528],[-10.91861033, -37.06398535],[-10.91861101, -37.06398616],[-10.91861229, -37.06398567],[-10.91861452, -37.06398519],[-10.91852107, -37.06433786],[-10.91854463, -37.06535452],[-10.91862404, -37.06630359],[-10.91879595, -37.06735107],[-10.91863274, -37.06821768],[-10.91867692, -37.06827064],[-10.91864985, -37.06846654],[-10.91861474, -37.06844821],[-10.91861158, -37.06845233],[-10.91861335, -37.06844958],[-10.91863853, -37.06863415],[-10.91866434, -37.06936379],[-10.91857642, -37.06997517],[-10.91855849, -37.07080263],[-10.91839213, -37.07178178],[-10.91835998, -37.07254682],[-10.91817896, -37.07257863],[-10.91805938, -37.07302097],[-10.91824085, -37.07327488],[-10.91825536, -37.07351718],[-10.9182579 , -37.07365122],[-10.91824237, -37.07365167],[-10.91824648, -37.07364797],[-10.9182473 , -37.07364716],[-10.91824587, -37.07364717],[-10.9182463 , -37.07364646],[-10.91824667, -37.07364626],[-10.91824711, -37.07364598],[-10.91829794, -37.07417675],[-10.91832389, -37.07471123],[-10.91834816, -37.07553953],[-10.91838258, -37.07596903],[-10.91830836, -37.076009  ],[-10.91831556, -37.07602092],[-10.91835704, -37.07625065],[-10.91840705, -37.07718778],[-10.91836099, -37.07770235],[-10.91843053, -37.07811014],[-10.91859487, -37.07820678],[-10.91832849, -37.07835976],[-10.91841839, -37.07871173],[-10.91858561, -37.07912875],[-10.91853693, -37.08029196],[-10.91847022, -37.08132272],[-10.91864122, -37.08232053],[-10.91878421, -37.08390708],[-10.91902161, -37.08549171],[-10.91957646, -37.08678353],[-10.91990603, -37.08762652],[-10.92011327, -37.08811781],[-10.92026249, -37.08852046],[-10.92027593, -37.08896067],[-10.92028812, -37.08971096],[-10.92086275, -37.09022295],[-10.92119806, -37.09125864],[-10.92158668, -37.09245244],[-10.9219998 , -37.09341251],[-10.92227813, -37.09389165],[-10.92251669, -37.09491899],[-10.9227356 , -37.09633969],[-10.92225014, -37.09771002],[-10.92184819, -37.09906076],[-10.92144139, -37.09987985],[-10.92144481, -37.09995651],[-10.92130557, -37.10039003],[-10.92115916, -37.1016734 ],[-10.92137987, -37.10308411],[-10.92125626, -37.10455606],[-10.92161594, -37.10520467],[-10.92292039, -37.10514096],[-10.92374638, -37.10509667],[-10.92379817, -37.10503713],[-10.92420939, -37.10468552]]))
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curves.add(fred.Curve([[-10.92366833, -37.04470333],[-10.92388667, -37.04459   ],[-10.9243    , -37.04443667],[-10.92942   , -37.04500667],[-10.92949833, -37.04511667],[-10.92964167, -37.045355  ],[-10.92979667, -37.04559833],[-10.92994833, -37.04581333],[-10.93014333, -37.04608333],[-10.930215  , -37.04626   ],[-10.930225  , -37.04630833],[-10.93017167, -37.046335  ],[-10.93017667, -37.04637833],[-10.93021167, -37.046435  ],[-10.93022167, -37.046565  ],[-10.930385  , -37.046725  ],[-10.93042333, -37.04682667],[-10.93045333, -37.04683833],[-10.930475  , -37.04681833],[-10.93047167, -37.04683   ],[-10.93051333, -37.04682833],[-10.93051333, -37.04682833],[-10.930535  , -37.04677833],[-10.93051167, -37.04674667],[-10.930545  , -37.04672333],[-10.93058167, -37.046735  ],[-10.93061   , -37.04673167],[-10.930675  , -37.04672   ],[-10.93091167, -37.04697667],[-10.93120167, -37.04733833],[-10.93131   , -37.04729333],[-10.93144833, -37.047365  ],[-10.93161333, -37.04756167],[-10.93188833, 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-37.04700667],[-10.94415667, -37.04692   ],[-10.944685  , -37.04639667],[-10.94502   , -37.046285  ],[-10.945335  , -37.04617167],[-10.94551167, -37.04608667],[-10.94556167, -37.04607167],[-10.94560667, -37.04605833],[-10.94565333, -37.04604667],[-10.94564   , -37.04606833],[-10.945655  , -37.04607   ],[-10.94581333, -37.04604   ],[-10.94615833, -37.04593   ],[-10.94657333, -37.04581833],[-10.94716667, -37.04568833],[-10.94778   , -37.04560833],[-10.94858667, -37.04545833],[-10.949345  , -37.04543   ],[-10.95012   , -37.04549833],[-10.95087   , -37.045625  ],[-10.95162167, -37.045695  ],[-10.95236333, -37.045695  ],[-10.95323   , -37.04548   ],[-10.953905  , -37.045265  ],[-10.95445167, -37.04512333],[-10.95491167, -37.04514167],[-10.95536167, -37.04527333],[-10.95569833, -37.04549   ],[-10.956075  , -37.04541667],[-10.95645   , -37.04527833],[-10.9566    , -37.04522167],[-10.956585  , -37.04525   ],[-10.95676167, -37.04518667],[-10.95703667, -37.045075  ],[-10.95743167, -37.04488667],[-10.95790667, -37.04466333],[-10.95842167, -37.04445   ],[-10.959     , -37.04420167],[-10.95958167, -37.04394   ],[-10.96025667, -37.04360167],[-10.96096   , -37.04327667],[-10.96165333, -37.04298667],[-10.96249667, -37.04261833],[-10.96316   , -37.042405  ],[-10.96383667, -37.04225667],[-10.96469   , -37.04225667],[-10.96537333, -37.04236167],[-10.96593   , -37.0425    ],[-10.96629333, -37.04257167],[-10.96652167, -37.04256167],[-10.96662333, -37.04262833],[-10.96689333, -37.04273833],[-10.96724833, -37.04289833],[-10.967395  , -37.04297333],[-10.96738833, -37.04269   ],[-10.967495  , -37.04238833],[-10.96758   , -37.04203333],[-10.96761667, -37.04176333],[-10.96762   , -37.04172333],[-10.96762   , -37.04172   ],[-10.96760667, -37.04174   ],[-10.96763   , -37.04173833],[-10.96764   , -37.04174667],[-10.96767167, -37.04174333],[-10.96767333, -37.04172833],[-10.96771   , -37.04163167],[-10.96771167, -37.04162833],[-10.96771167, -37.04162167],[-10.96769   , -37.04167   ],[-10.96768833, -37.04166   ],[-10.96767667, -37.04166   ],[-10.96767167, -37.04166333],[-10.96770167, -37.04162167],[-10.96783667, -37.04138333],[-10.96813833, -37.04147667],[-10.96852833, -37.04157   ],[-10.96927   , -37.04167833],[-10.96989833, -37.04186   ],[-10.970665  , -37.04203333],[-10.97124167, -37.04213167],[-10.97162   , -37.042135  ],[-10.97151667, -37.04214667],[-10.97125167, -37.04228167],[-10.971275  , -37.04231833],[-10.97151167, -37.04235333],[-10.972     , -37.04243167],[-10.97252   , -37.04254333],[-10.97287   , -37.04260667],[-10.97314   , -37.04266667],[-10.97335667, -37.04272333],[-10.973515  , -37.04261833],[-10.97361167, -37.04260167],[-10.97369   , -37.0426    ],[-10.97369333, -37.04260167],[-10.97385833, -37.042605  ],[-10.97423167, -37.042715  ],[-10.97472333, -37.04288   ],[-10.97553   , -37.04310833],[-10.97617667, -37.04323667],[-10.97693833, -37.04342   ],[-10.97756167, -37.04356   ],[-10.97825667, -37.043745  ],[-10.97886333, -37.0439    ],[-10.97936   , -37.04401   ],[-10.97961333, -37.04409667],[-10.97974833, -37.044205  ],[-10.97982667, -37.044585  ],[-10.97963333, -37.04517   ],[-10.979385  , -37.04588667],[-10.97914833, -37.04651   ],[-10.97898   , -37.04679667],[-10.97893333, -37.04698667],[-10.97909667, -37.04712833],[-10.97912667, -37.047185  ],[-10.97908667, -37.047215  ],[-10.979085  , -37.04724333]]))
curves.add(fred.Curve([[-10.89688234, -37.05339968],[-10.89689515, -37.05332973],[-10.89688042, -37.05333247],[-10.89688029, -37.05333484],[-10.89688058, -37.05333512],[-10.89688073, -37.05333528],[-10.8968805 , -37.05333564],[-10.89688045, -37.0533357 ],[-10.89688034, -37.05333584],[-10.89688022, -37.05333665],[-10.89687998, -37.05333665],[-10.8968798 , -37.05333672],[-10.8968771 , -37.05333475],[-10.89686571, -37.05335033],[-10.89686453, -37.05338245],[-10.89690625, -37.053412  ],[-10.89714799, -37.05345149],[-10.89731552, -37.05353814],[-10.89722363, -37.0537264 ],[-10.89712402, -37.05392281],[-10.89700272, -37.05391454],[-10.89669729, -37.05377559],[-10.89637283, -37.05373788],[-10.89628634, -37.05376364],[-10.89625468, -37.05380163],[-10.89626958, -37.05404301],[-10.89630975, -37.05439376],[-10.8963886 , -37.05509832],[-10.89644765, -37.05538955],[-10.8965611 , -37.05575682],[-10.89665346, -37.05613108],[-10.89677345, -37.05672517],[-10.89689319, -37.05728734],[-10.89692781, -37.05739169],[-10.89695023, -37.05753143],[-10.89702285, -37.05769891],[-10.8971346 , -37.057792  ],[-10.89734674, -37.05797843],[-10.89746565, -37.05809327],[-10.89745873, -37.05809087],[-10.89746601, -37.05809045],[-10.89746603, -37.05809043],[-10.89746598, -37.0580906 ],[-10.89746595, -37.05809065],[-10.89750503, -37.05812029],[-10.89776568, -37.05832533],[-10.89815091, -37.05824039],[-10.89867417, -37.05785587],[-10.89905788, -37.05755751],[-10.89965258, -37.05710931],[-10.90031391, -37.05666742],[-10.90072693, -37.05639989],[-10.90117312, -37.0560867 ],[-10.90167986, -37.05570044],[-10.90223155, -37.05532095],[-10.90267435, -37.05501594],[-10.90281205, -37.05492839],[-10.90281977, -37.05492466],[-10.9028111 , -37.05493056],[-10.90281184, -37.05493098],[-10.90281179, -37.05493125],[-10.90281184, -37.05493146],[-10.9028119 , -37.05493155],[-10.90281195, -37.05493173],[-10.9028117 , -37.05493193],[-10.90281944, -37.05492637],[-10.90318115, -37.05466438],[-10.90361849, -37.05433795],[-10.90395364, -37.05420787],[-10.90395573, -37.05453654],[-10.90394111, -37.05505263],[-10.90394185, -37.05587736],[-10.90392791, -37.05664783],[-10.90389758, -37.05750308],[-10.90388737, -37.05786664],[-10.90403   , -37.05799884],[-10.90431907, -37.05799646],[-10.90463524, -37.05800058],[-10.90492265, -37.0580025 ],[-10.90509223, -37.0580149 ],[-10.90513417, -37.05805725],[-10.90519558, -37.05826165],[-10.90527994, -37.05877507],[-10.90535515, -37.05906472],[-10.90619649, -37.05905899],[-10.90641173, -37.06018562],[-10.90644041, -37.06067098],[-10.90642897, -37.06086107],[-10.90641925, -37.06087587],[-10.90642255, -37.06088143],[-10.90642329, -37.06088235],[-10.90642264, -37.06088388],[-10.90642211, -37.06090121],[-10.90642028, -37.06112732],[-10.90649051, -37.06164138],[-10.90728268, -37.06183192],[-10.90753491, -37.06201037],[-10.90761894, -37.06208487],[-10.90763191, -37.06209038],[-10.90764293, -37.06208956],[-10.90764576, -37.06209575],[-10.90764926, -37.06209673],[-10.90764498, -37.06210186],[-10.90764444, -37.0621018 ],[-10.9076441 , -37.06210176],[-10.90764407, -37.06210173],[-10.90791968, -37.06228879],[-10.90840258, -37.06261833],[-10.90885022, -37.06293506],[-10.90941396, -37.06335066],[-10.91002845, -37.06379331],[-10.91021656, -37.06385412],[-10.91021107, -37.06382905],[-10.91020892, -37.0638263 ],[-10.91020903, -37.06382629],[-10.91020921, -37.06382624],[-10.91020941, -37.06382628],[-10.91020941, -37.06382636],[-10.91020942, -37.0638264 ],[-10.91020943, -37.06382641],[-10.91021067, -37.06382699],[-10.91051354, -37.06396407],[-10.91086507, -37.06407459],[-10.91112765, -37.06418145],[-10.91112402, -37.06418525],[-10.91112739, -37.064179  ],[-10.91113069, -37.06417743],[-10.91113068, -37.06417746],[-10.91113069, -37.06417745],[-10.91113068, -37.06417741],[-10.91113062, -37.06417743],[-10.91113027, -37.06417782],[-10.91113022, -37.06417796],[-10.91113014, -37.06417815],[-10.91113018, -37.06417815],[-10.9111301 , -37.06417819],[-10.91113003, -37.06417818],[-10.91113018, -37.06417821],[-10.91121402, -37.06421624],[-10.91152921, -37.06426605],[-10.91195342, -37.06430617],[-10.91243864, -37.06431631],[-10.91301115, -37.06431624],[-10.91373203, -37.06430726],[-10.9143199 , -37.06424356],[-10.91526178, -37.06407409],[-10.91568718, -37.06396253],[-10.91601655, -37.06391468],[-10.91614016, -37.06400304],[-10.91613907, -37.06426894],[-10.91611837, -37.0645705 ],[-10.91620218, -37.06472138],[-10.91657107, -37.0648288 ],[-10.9170171 , -37.06493571],[-10.91728016, -37.06502682],[-10.91734995, -37.06509569],[-10.91735968, -37.06534346],[-10.91731253, -37.06557038],[-10.91730704, -37.06556575],[-10.91730599, -37.06555167]]))

clustering = fred.discrete_klcenter(6, 8, curves, local_search = 10, fast_simplification=True, distance_func=distance_func)
clustering.optimize_centers(curves, consecutive_call = True)

fred.plot_clustering(clustering, curves, vertex_markings=False)
```

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