558 research outputs found
Deep Group Interest Modeling of Full Lifelong User Behaviors for CTR Prediction
Extracting users' interests from their lifelong behavior sequence is crucial
for predicting Click-Through Rate (CTR). Most current methods employ a
two-stage process for efficiency: they first select historical behaviors
related to the candidate item and then deduce the user's interest from this
narrowed-down behavior sub-sequence. This two-stage paradigm, though effective,
leads to information loss. Solely using users' lifelong click behaviors doesn't
provide a complete picture of their interests, leading to suboptimal
performance. In our research, we introduce the Deep Group Interest Network
(DGIN), an end-to-end method to model the user's entire behavior history. This
includes all post-registration actions, such as clicks, cart additions,
purchases, and more, providing a nuanced user understanding. We start by
grouping the full range of behaviors using a relevant key (like item_id) to
enhance efficiency. This process reduces the behavior length significantly,
from O(10^4) to O(10^2). To mitigate the potential loss of information due to
grouping, we incorporate two categories of group attributes. Within each group,
we calculate statistical information on various heterogeneous behaviors (like
behavior counts) and employ self-attention mechanisms to highlight unique
behavior characteristics (like behavior type). Based on this reorganized
behavior data, the user's interests are derived using the Transformer
technique. Additionally, we identify a subset of behaviors that share the same
item_id with the candidate item from the lifelong behavior sequence. The
insights from this subset reveal the user's decision-making process related to
the candidate item, improving prediction accuracy. Our comprehensive
evaluation, both on industrial and public datasets, validates DGIN's efficacy
and efficiency
AT4CTR: Auxiliary Match Tasks for Enhancing Click-Through Rate Prediction
Click-through rate (CTR) prediction is a vital task in industrial
recommendation systems. Most existing methods focus on the network architecture
design of the CTR model for better accuracy and suffer from the data sparsity
problem. Especially in industrial recommendation systems, the widely applied
negative sample down-sampling technique due to resource limitation worsens the
problem, resulting in a decline in performance. In this paper, we propose
\textbf{A}uxiliary Match \textbf{T}asks for enhancing
\textbf{C}lick-\textbf{T}hrough \textbf{R}ate prediction accuracy (AT4CTR) by
alleviating the data sparsity problem. Specifically, we design two match tasks
inspired by collaborative filtering to enhance the relevance modeling between
user and item. As the "click" action is a strong signal which indicates the
user's preference towards the item directly, we make the first match task aim
at pulling closer the representation between the user and the item regarding
the positive samples. Since the user's past click behaviors can also be treated
as the user him/herself, we apply the next item prediction as the second match
task. For both the match tasks, we choose the InfoNCE as their loss function.
The two match tasks can provide meaningful training signals to speed up the
model's convergence and alleviate the data sparsity. We conduct extensive
experiments on one public dataset and one large-scale industrial recommendation
dataset. The result demonstrates the effectiveness of the proposed auxiliary
match tasks. AT4CTR has been deployed in the real industrial advertising system
and has gained remarkable revenue
A shorter loop in RouxY hepatojejunostomy reconstruction for choledochal cysts is equally effective: preliminary results of a prospective randomized study. J Pediatr Surg
Abstract Background: Conventionally, an adult's standard of a 40-cm loop is adopted in Roux-Y hepatojejunostomy (RYHJ) in choledochal cyst (CDC) in children, irrespective of patient size. The redundant length of the jejunal limb may lead to complications. We compared the outcome of an individualized short Roux loop with the standard loop length in RYHJ in children with CDC. Methods: Two hundred eighteen children with CDC undergoing laparoscopic RYHJ were prospectively randomized into 2 groups: (1) conventional group (CG; n = 108) where a standard 35-40 cm Roux-loop length was used regardless of the child's size and (2) short loop group (SLG; n = 110) in which the Roux-loop length was based on the distance between hepatic hilum and umbilicus. Ultrasonography, upper gastrointestinal contrast studies, and laboratory tests were conducted during the follow-up period. Results: The mean Roux-loop length of SLG was significantly shorter than that of CG (Student t test, P b .05). There was no significant difference between the 2 groups in age, operative blood loss, operative time, postoperative hospital stay, and duration of drainage. In CG, 2 of (1.8%) 108 patients developed Roux-loop obstruction, whereas none was detected in SLG (0%). Mild reflux was detected in 2 CG patients and 1 SLG patient 1 month postoperatively, all of which subsided 6 months later. No episodes of cholangitis were observed in either group. Conclusions: An individualized short Roux-loop length in RYHJ is as effective as the conventional Roux-loop length
The Decay Process of an {\alpha}-configuration Sunspot
The decay of sunspot plays a key role in magnetic flux transportation in
solar active regions (ARs). To better understand the physical mechanism of the
entire decay process of a sunspot, an {\alpha}-configuration sunspot in AR NOAA
12411 was studied. Based on the continuum intensity images and vector magnetic
field data with stray light correction from Solar Dynamics
Observatory/Helioseismic and Magnetic Imager, the area, vector magnetic field
and magnetic flux in the umbra and penumbra are calculated with time,
respectively. Our main results are as follows: (1) The decay curves of the
sunspot area in its umbra, penumbra, and whole sunspot take the appearance of
Gaussian profiles. The area decay rates of the umbra, penumbra and whole
sunspot are -1.56 MSH/day, -12.61 MSH/day and -14.04 MSH/day, respectively; (2)
With the decay of the sunspot, the total magnetic field strength and the
vertical component of the penumbra increase, and the magnetic field of the
penumbra becomes more vertical. Meanwhile, the total magnetic field strength
and vertical magnetic field strength for the umbra decrease, and the
inclination angle changes slightly with an average value of about 20{\deg}; (3)
The magnetic flux decay curves of the sunspot in its umbra, penumbra, and whole
sunspot exhibit quadratic patterns, their magnetic flux decay rates of the
umbra, penumbra and whole sunspot are -9.84 * 10^19 Mx/day, -1.59 * 10^20
Mx/day and -2.60 * 10^20 Mx/day , respectively. The observation suggests that
the penumbra may be transformed into the umbra, resulting in the increase of
the average vertical magnetic field strength and the reduction of the
inclination angle in the penumbra during the decay of the sunspot
Generation of Small 32P-Labeled Peptides as a Potential Approach to Colorectal Cancer Therapy
Cancers have been revealed to be extremely heterogenous in terms of the frequency and types of mutations present in cells from different malignant tumors. Thus, it is likely that uniform clinical treatment is not optimal for all patients, and that the development of individualized therapeutic regimens may be beneficial. We describe the generation of multiple, unique small peptides nine to thirty-four amino acids in length which, when labeled with the radioisotope 32P, bind with vastly differing efficiencies to cell lines derived from different colon adenocarcinomas. In addition, the most effective of these peptides permanently transfers the 32P radioisotope to colorectal cancer cellular proteins within two hours at a rate that is more than 150 times higher than in cell lines derived from other cancers or from the normal tissues tested. Currently, the only two FDA-approved radioimmunotherapeutic agents in use both employ antibodies directed against the B cell marker CD20 for the treatment of non-Hodgkin's lymphoma. By using the method described herein, large numbers of different 32P-labeled peptides can be readily produced and assayed against a broad spectrum of cancer types. This report proposes the development and use of 32P-labeled peptides as potential individualized peptide-binding therapies for the treatment of colon adenocarcinoma patients
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