{"id":34112,"date":"2024-08-02T05:40:53","date_gmt":"2024-08-02T05:40:53","guid":{"rendered":"https:\/\/kalilinuxtutorials.com\/?p=34112"},"modified":"2024-08-02T05:40:55","modified_gmt":"2024-08-02T05:40:55","slug":"annchor","status":"publish","type":"post","link":"https:\/\/kalilinuxtutorials.com\/annchor\/","title":{"rendered":"ANNchor – Accelerating k-NN Graphs For Complex Metrics With Machine Learning"},"content":{"rendered":"\n

ANNchor is a python library which constructs approximate\u00a0k<\/em>-nearest neighbour graphs for slow metrics. <\/p>\n\n\n\n

The\u00a0k<\/em>-NN graph is an extremely useful data structure that appears in a wide variety of applications, for example: clustering, dimensionality reduction, visualisation and exploratory data analysis (EDA). <\/p>\n\n\n\n

However, if we want to use a slow metric, these\u00a0k<\/em>-NN graphs can take an exceptionally long time to compute. <\/p>\n\n\n\n

Typical slow metrics include the Wasserstein metric (Earth Mover’s distance) applied to images, and Levenshtein (Edit) distance on long strings, where the time taken to compute these distances is significantly longer than a typical Euclidean distance.<\/p>\n\n\n\n

ANNchor uses Machine Learning methods to infer true distances between points in a data set from a variety of features derived from anchor points (aka landmarks\/waypoints). <\/p>\n\n\n\n

In practice, this means that ANNchor does not make as many calls to the underlying metric as other state of the art\u00a0k<\/em>-NN graph generation techniques. <\/p>\n\n\n\n

This translates to quicker run times, especially when the metric is slow.<\/p>\n\n\n\n

Results from ANNchor can easily be combined with other popular libraries in the Data Science community. <\/p>\n\n\n\n

In the docs we give examples of how to use ANNchor in an EDA pipeline alongside\u00a0UMAP\u00a0and\u00a0HDBSCAN<\/a>.<\/p>\n\n\n\n

Installation<\/strong><\/a><\/h2>\n\n\n\n

Clone this repo and install with pip:<\/p>\n\n\n\n

pip install git+https:\/\/github.com\/gchq\/annchor.git<\/code><\/pre>\n\n\n\n
Basic Usage<\/strong><\/h2>\n\n\n\n
import numpy as np\nimport annchor\n\nX =          #your data, list\/np.array of items\ndistance =   #your distance function, distance(X[i],X[j]) = d\n\nann = annchor.Annchor(X,\n                      distance,\n                      n_anchors=15,\n                      n_neighbors=15,\n                      p_work=0.1)\nann.fit()\n\nprint(ann.neighbor_graph)<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"
ANNchor is a python library which constructs approximate\u00a0k-nearest neighbour graphs for slow metrics. The\u00a0k-NN graph is an extremely useful data structure that appears in a wide variety of applications, for example: clustering, dimensionality reduction, visualisation and exploratory data analysis (EDA). However, if we want to use a slow metric, these\u00a0k-NN graphs can take an exceptionally […]<\/p>\n","protected":false},"author":12,"featured_media":34115,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"fifu_image_url":"https:\/\/blogger.googleusercontent.com\/img\/b\/R29vZ2xl\/AVvXsEg1HcQ36APqcXrglC_FUbQ2j9sFrOi2Nl5-ed76bTi_elPF7GnXzhJHL6g1w9LqZh-DmrSbwIKlNbOunEcApAtoGuFX0__WU4sBPTuWxBvAfgbQH7ohjyX-O5fp3e1StaMqsLRTeIggijE79DaKnqZWxnUUEXpKIVqVr-OqFkCipzDgmO-fxBHSbWBBP5C6\/s16000\/ANNchor.webp","fifu_image_alt":"","_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[38],"tags":[737,6321,6052,6325],"class_list":["post-34112","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-software","tag-cybersecurity","tag-informationsecurity","tag-kalilinux","tag-kalilinuxtools"],"yoast_head":"\nANNchor - Accelerating k-NN Graphs For Complex Metrics With<\/title>\n<meta name=\"description\" content=\"ANNchor is a python library which constructs approximate\u00a0k-nearest neighbour graphs for slow metrics. 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