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Short texts, such as Twitter social media posts, have become increasingly popular on the Internet. Inferring topics from massive numbers of short texts is important to many real-world applications. A single short text often contains a few words, making traditional topic models less effective. A recently developed biterm topic model (BTM) effectively models short texts by capturing the rich global word co-occurrence information. However, in the sparse short-text context, many highly related words may never co-occur. BTM may lose many potential coherent and prominent word co-occurrence patterns that cannot be observed in the corpus. To address this problem, we propose a novel relational BTM (R-BTM) model, which links short texts using a similarity list of words computed employing word embeddings. To evaluate the effectiveness of R-BTM, we compare it against the existing short-text topic models on a variety of traditional tasks, including topic quality, clustering and text similarity. Experimental results on real-world datasets indicate that R-BTM outperforms baseline topic models for short texts. [ABSTRACT FROM AUTHOR]

As predators, the macronutrients spiders extract from their prey play important roles in their mating and reproduction. Previous studies of macronutrients on spider mating and reproduction focus on protein, the potential impact of prey lipid content on spider mating and reproduction remains largely unexplored. Here, we tested the influence of prey varying in lipid content on female mating, sexual cannibalism, reproduction, and offspring fitness in the wolf spider Pardosa pseudoannulata. We acquired 2 groups of fruit fly Drosophila melanogaster that differed significantly in lipid but not protein content by supplementing cultural media with a high or low dose of sucrose on which the fruit flies were reared (HL: high lipid and LL: low lipid). Subadult (i.e. 1 molt before adult) female spiders that fed HL flies matured with significantly higher lipid content than those fed LL flies. We found that the mated females fed with HL flies significantly shortened pre-oviposition time and resulted in a significantly higher fecundity. However, there was no significant difference in female spiders varying in lipid content on other behaviors and traits, including the latency to courtship, courtship duration, mating, copulation duration, sexual cannibalism, offspring body size, and survival. Hence, our results suggest that the lipid content of prey may be a limiting factor for female reproduction, but not for other behavioral traits in the wolf spiders P. pseudoannulata. [ABSTRACT FROM AUTHOR]