Cost-Effective HITs for Relative Similarity Comparisons

Similarity comparisons of the form "Is object a more similar to b than to c?" are useful for computer vision and machine learning applications. Unfortunately, an embedding of $n$ points is specified by $n^3$ triplets, making collecting every triplet an expensive task. In noticing this difficulty, other researchers have investigated more intelligent triplet sampling techniques, but they do not study their effectiveness or their potential drawbacks. Although it is important to reduce the number of collected triplets, it is also important to understand how best to display a triplet collection task to a user. In this work we explore an alternative display for collecting triplets and analyze the monetary cost and speed of the display. We propose best practices for creating cost effective human intelligence tasks for collecting triplets. We show that rather than changing the sampling algorithm, simple changes to the crowdsourcing UI can lead to much higher quality embeddings. We also provide a dataset as well as the labels collected from crowd workers.Comment: 7 pages, 7 figure

Down Home Rag

https://digitalcommons.library.umaine.edu/mmb-vp/5472/thumbnail.jp

FEDERAL PROCEDURE-VENUE-TRANSFER UNDER SECTION 1404(a) TO DISTRICT WHERE VENUE ORIGINALLY WOULD HAVE BEEN IMPROPER

Civil anti-trust actions were properly brought against defendants in the Federal District Court for the District of Delaware. Defendants sought a transfer of the suits to a district court in Texas under section 1404(a) of the Judicial Code, which allows a transfer when requirements of convenience are met to any district where the suit might have been brought Although venue in the Texas District Court would not have been proper when the suits were originally instituted, defendants claimed that their express waiver of improper venue removed the bar to transfer. The district court ruled that it lacked the power to make the transfer. On petition to the court of appeals for a writ of mandamus, held, two judges dissenting, that transfer can be made if the district court feels that it would serve the convenience of parties and witnesses and would be in the interest of justice. Paramount Pictures v. Rodney, (3d Cir. 1950) 186 F. (2d) 111

Silva: PRESIDENTIAL SUCCESSION

A Review of PRESIDENTIAL SUCCESSION. By Ruth C. Silva

The galaxy-halo connection of DESI luminous red galaxies with subhalo abundance matching

We use subhalo abundance and age distribution matching to create magnitude-limited mock galaxy catalogs at $z\sim0.43$, $0.52$, and $0.63$ with $z$-band and $3.4$ micron $W1$-band absolute magnitudes and ${r-z}$ and ${r-W1}$ colors. From these magnitude-limited mocks we select mock luminous red galaxy (LRG) samples according to the $(r-z)$-based (optical) and $(r-W1)$-based (infrared) selection criteria for the LRG sample of the Dark Energy Spectroscopic Instrument (DESI) Survey. Our models reproduce the number densities, luminosity functions, color distributions, and projected clustering of the DESI Legacy Surveys that are the basis for DESI LRG target selection. We predict the halo occupation statistics of both optical and IR DESI LRGs at fixed cosmology, and assess the differences between the two LRG samples. We find that IR-based SHAM modeling represents the differences between the optical and IR LRG populations better than using the $z$-band, and that age distribution matching overpredicts the clustering of LRGs, implying that galaxy color is uncorrelated with halo age in the LRG regime. Both the optical and IR DESI LRG target selections exclude some of the most luminous galaxies that would appear to be LRGs based on their position on the red sequence in optical color-magnitude space. Both selections also yield populations with a non-trivial LRG-halo connection that does not reach unity for the most massive halos. We find the IR selection achieves greater completeness ($\gtrsim 90\%$) than the optical selection across all redshift bins studied.Comment: 20 pages, 14 figures, submitted to Ap