# Tag Info

2

The first eigenvalue in your plot is non-zero, whereas the last is one. This seems to suggest that the Laplacian whose eigenvalues you are computing is different from the standard Laplacian $L = D - W$, where $D$ is the matrix whose diagonal entries are degrees of nodes and $W$ is the weighted adjacency matrix. So in your plot, $\lambda_{19} = 1$ and $\... 1 Let's say that your dataset is a bunch of temperatures with a bunch of features related to when/where the measurements were made. A measurement is a global outlier if it diverges from the distribution of temperatures regardless of the features (when and where) because that measurement is far off the global distribution (100°C for example). The example makes ... 1 I strongly recommend to start with a simple statistical data analysis. In this approach you take the Moving Average/Median of signals and if one signal shows a magnitude -/+ 3 times standard deviation, you mark it as anomaly. Please have a look at this answer for Python code. 1 Welcome to the community! You may want to refer to a tutorial on Agglomerative Hierarchical Clustering before reading this answer. My explanation is more practical. Assume the data below: from scipy.cluster.hierarchy import ward, fcluster from scipy.spatial.distance import pdist import numpy as np import matplotlib.pyplot as plt from matplotlib.text import ... 1 The limited size is not especially an issue. However the normal way to do that is to use a supervised classification method (for instance decision trees, but there are many options), and this means training a model from a large enough set of annotated instances. If obtaining a training set is not possible, you could try some kind of similarity-based approach ... 1 The Jaccard coefficient (or Jaccard similarity) is defined on two sets$A$and$B\$: $$J(A,B) = {{|A \cap B|}\over{|A \cup B|}} = {{|A \cap B|}\over{|A| + |B| - |A \cap B|}}$$ There is a single definition for this coefficient, but note that Jaccard is a general similarity measure, it is not specifically designed as an evaluation measure. So assuming one ...

1

I agree with your assumption, the vector space is the same so I don't see any major problem with this approach. Still this approach might cause some more subtle bias, depending on the differences between the models (sets of terms, number of clusters). I could imagine the following problems happening: if there is a big difference in number of clusters ...

1