# Questions tagged [spectral-clustering]

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1 vote
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### What's the fastest clustering package in Python?

I'd like to perform clustering analysis on a dataset with 1,300 columns and 500,000 rows. I've seen that clustering algorithms are available in SciKit-Learn. But I'm worried that the algorithms will ...
• 521
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### MEL VS linear spectrograms for bioacoustics machine learning

I don't have background in bioacoustics but working on a data-science project in bioacoustics. I am working with animal vocalizations recorded at sampling rate of 250000. Animals are bats, which are ...
• 165
1 vote
26 views

### best algorithms for clustering customers, customer segmentation

I have a dataset mixture of categorical and numerical variable, I was wonder what are the best algorithms to cluster customers? how to find the underlying patterns that segments a customer??
14 views

### understanding quadratic form in proof of positive definiteness of laplacian matrix

Consider the proof at page 2 found here: https://people.orie.cornell.edu/dpw/orie6334/Fall2016/lecture7.pdf I cant wrap my head around the 2nd and third line: \begin{align} &= \sum_{i \in V}x(i)^2 ...
13 views

### Derive quadratic form of this laplacian matrix

Lets look at the following laplacian: $L = I - \frac{1}{d}A$ and the graph $H = (U, V)$. I am trying to derive the known quadratic form of this laplacian \$x^T Lx = \frac{1}{d}\sum_{u, v \in H}(x_u - ...
10 views

### Autoencoder on spectral image ASCII data file

I am discovering Autoencoder CNN, I took a look around on tutorials, I see lot's of examples with images as input. I was wondering if it is possible to use files whose pixels are represented by Ascii ...
• 137
45 views

### How can I cluster my weighted directed graph?

I've been trying to cluster my graph of jobs. The edges weights are the count of the transitions between 2 nodes(jobs). I've been reading about and I've based my code in this paper: https://hal....
1 vote
40 views

### What clustering algorithm is best for dataset with only binary categorical features

I have a dataset with a lot of binary categorical features and a single continuous target value. I would like to cluster them but I am not quite sure what to use? I have in the past used dbscan for ...
• 123
1 vote
128 views

### What are the benefits of using spectral k-means over simple k-means?

I have understood why k-means can get stuck in local minima. Now, I am curious to know how the spectral k-means helps to avoid this local minima problem. According to this paper A tutorial on ...
• 133
1 vote
45 views

### Why kmeans cluster breakup is like this [closed]

I have a galaxy spectrum data set (total 22000). Similar to an electronic wave data, two dimensional (Flux vs Wavelength). A typical set of wavelength plot looks like below Now I am doing kmeans on ...
• 129
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### Ways of calculating the area of colored regions in a map

Background I am a PHD student trying to improve my data science. One of my research projects, has me tasked with determining the size of the clusters in a colored image of regions. Here is an example ...
• 257
1 vote
23 views

### Clusterize Spectrum

I have pandas table which contains data about different observations, each one was measured in different wavlength. These observsations are different than each other in the treatment they have gotten. ...
• 349
1 vote
20 views

### Which version of spectral clustering in sklearn library?

Which version of spectral clustering is implemented in sklearn library? Is it Shi, Malik or Ng, Jordan, Weiss from this tutorial? In sklearn user guide, both versions are mentioned in reference. From ...
• 147
1 vote
883 views

### How to use spectral clustering to predict?

In an academic paper, they talk about using a nearest neighbour algorithm to predict the cluster of a new point. And how the number of nearest neighbours is set to 10 in their example. What do they ...
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