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@arXiv_csLG_bot@mastoxiv.page
2025-09-11 10:12:33

An upper bound of the silhouette validation metric for clustering
Hugo Str\"ang, Tai Dinh
https://arxiv.org/abs/2509.08625 https://arxiv.org/pdf/2509.…

An upper bound of the silhouette validation metric for clustering
The silhouette coefficient summarizes, per observation, cohesion versus separation in [-1, 1]; the average silhouette width (ASW) is a common internal measure of clustering quality where higher values indicate more coveted results. However, the dataset-specific maximum of ASW is typically unknown, and the standard upper limit 1 is often unattainable. In this work, we derive for each data point in a given dataset a sharp upper bound on its silhouette width. By aggregating these individual bounds…

@aardrian@toot.cafe
2025-09-10 18:42:56

Art.

A stone court building exterior wall showing the silhouette of a person on the ground holding up their hand and a protest sign in a defensive posture as a robed figure looms over it, gavel on the backswing to strike. The silhouette is inverted, in that the rest of the stone is caked in lighter grime, but the silhouette shows freshly cleaned pristine stone.

@toxi@mastodon.thi.ng
2025-09-10 09:15:19

7AM, out and about on a stunning rainy morning walk between layers of fog and clouds... absolute silence...
#MorningWalk #LandscapePhotography #NaturePhotography

Black and white photo of a pre-alpine landscape of rolling hills intersected by layers of dense fog

Black and white photo looking into the Lech valley near Reutte (in the distance), from above layers of fog and low hanging clouds. Silhouettes of forest and mountains fading into the gray background.

Black and white photo of the silhouette of a hill top surrounded by dense layers of fog.

Black and white photo of the edge of a forest and a mountain meadow with fog moving up the hill, quickly enshrouding trees and everything else

@hikingdude@mastodon.social
2025-11-09 15:38:19

My take for #silentSunday . Seen yesterday from the summit that I was #hiking to. I had to zoom in quite a bit to capture this distant scene.
Whenever I see a trailrunner passing me with his ultralight / small backpack, I'm wondering why I'm carrying that heavy gear up those mounta…

A sea of soft, billowing clouds stretches out beneath a dramatic mountain landscape, their fluffy white peaks gently undulating like waves. The mountains rise majestically from the cloud cover, their rugged silhouettes softened by the misty atmosphere. Layer upon layer of forested ridges and peaks fade into the distance, creating a sense of depth and scale that feels almost infinite.

The scene is serene and ethereal, with the clouds obscuring the lower slopes and adding an air of mystery to th…

@xtaran@chaos.social
2025-11-08 18:26:43

Heute kurz vor Ladenschluss der Apotheke doch noch #rausgeschafft und dabei einen wunderschönen rosa-orangenen #Sonnenuntergang zu sehen bekommen. 15 Minuten später auf Rückweg war er schon wieder weg.
Und da ich eh schon die Veloklamotten anhatte, habe ich auch grade noch mit dem G-Li…

Orange-rosaner Sonnenuntergang mit darüber gräulichen Wolken vor noch blauem Himmel. Links und rechts ragen laublose Äste als Silhouetten ins Bild, an der Unterkante des Bildes sind Hausdächer zu sehen.

Nächtlicher Blick vom Käferberg über Zürich in Richtung Zürisee. Es hängt Dunst über der Stadt, welcher von den Lichtern der Stadt erleuchtet wird. Im Vordergrund mehrere laublose Bäume als Silhouette vor den Lichtern der Stadt.

Blick vom Käferberg oberhalb der Waid ins Stadtzürcher Limmattal. Links und im Vordergrund ein paar Baumsilhouetten. Im Tal unten eine riesige, grelle Lichtquelle, die den Dunst darüber sehr deutlich erleuchtet. Die Szenerie erinnert fast an eine gerade in diesem Moment stattfindende Explosion. Es ist aber "nur" ein hell erleuchtetes Fussballstadion, das Stadion Letzigrund.

Nächtlicher Blick einen vom Veloscheinwerfer erleuchteten Landwirtschaftsweg entlang. Am Horizont zwei sich gegenüber stehende Flutlichtscheinwerfer (Sportplatz Höngg), die auch den Dunst darüber etwas beleuchten. Dazwischen und rundherum die Lichter mehrerer Siedlungen.

@PaulWermer@sfba.social
2025-11-10 14:27:21

Good morning.

Early morning photo of 2 cranes, with tree branches on either side in silhouette against orange /pink clouds

@peterhoneyman@a2mi.social
2025-10-10 01:50:20

sunset over marquette bay
#lakesuperior

This is a beautifully serene beach scene captured during sunset. The composition features:

Foreground: A sandy beach with scattered rocks and driftwood along the shoreline. A small rowboat rests on the sand near the water's edge.

Main Elements: On the left side, a striking silhouette of a pine tree frames the scene, with the sun glowing brilliantly through its branches, creating a natural focal point.

Water: The calm body of water—Marquette Bay—displays gorgeous gradient colors ranging from …

@gscherer2@social.linux.pizza
2025-11-10 16:31:30

Sunset over Carpinteria State Beach. Carpinteria, California, USA. March, 2025. #beach #sunset #monochrome

Black and white image of sunset at Carpinteria State Beach on a cloudy day . The foreground is a sandy beach. In the background is the ocean, and on the horizon the Channel Islands are visible, along with a row of oil platforms. In the center of the image a woman, seen from behind in silhouette, is walking towards the water.

@leftsidestory@mstdn.social
2025-10-10 00:30:07

Moody Urbanity - UP ⬆️
情绪化城市 - 上面 ⬆️
📷 Nikon FE
🎞️ Ilford HP5 Plus 400, expired 1993
#filmphotography #Photography #blackandwhite

Ilford HP5 Plus 400 (FF)

English Alt Text:
A black-and-white photo of a wide city street flanked by buildings on both sides. On the left, a modern multi-story building features curved, layered architecture. On the right, a tall rectangular building has a more traditional design. The street includes crosswalks, traffic lanes, and a few vehicles, including a car and motorcycles. Trees line the road, and the top of the image is framed by silhouetted branches and leaves. Streetlights and traffic s…

Ilford HP5 Plus 400 (FF)

English Alt Text:
A black-and-white image of a large industrial building with corrugated metal siding. Several flags mounted on poles flutter in the wind in front of the building. Chinese characters are visible on the upper facade and above the entrance, though partially obscured. The sky is clear, and the lighting suggests daytime. The image has a documentary feel, emphasizing the structure’s utilitarian design and the presence of national or institutional identity th…

Ilford HP5 Plus 400 (FF)
English Alt Text:
A black-and-white photograph capturing a dramatic sky filled with textured clouds. On the left, partially hidden by dense tree foliage, are several multi-story buildings with rectangular windows—likely residential. Trees frame both sides of the image, creating a natural border. The sky dominates the scene with varying shades of gray, suggesting depth and movement. The grainy texture and lighting evoke a vintage, film-like aesthetic. The image feels int…

Ilford HP5 Plus 400 (FF)

English Alt Text:
A black-and-white photo of a high-rise building under construction. The structure is mostly complete, with its framework and exterior visible. Multiple tower cranes surround the building, indicating active construction. The sky is partly cloudy, and the image has a grainy texture that adds to its industrial and dramatic tone. The scene conveys the scale and complexity of urban development, with towering machinery and architectural ambition.

中文替代文字：
这…

@hikingdude@mastodon.social
2025-11-10 18:21:20

Ahhwm almost forgot that it is #MountainMonday ! So I quickly discarded my previous idea and share another photo from Saturday's #hiking adventure.
I was a bit surprised by the chill wind at the top but I had a great day. The best is that it was also quite some training for my legs a…

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