28 research outputs found
PillarNeSt: Embracing Backbone Scaling and Pretraining for Pillar-based 3D Object Detection
This paper shows the effectiveness of 2D backbone scaling and pretraining for
pillar-based 3D object detectors. Pillar-based methods mainly employ randomly
initialized 2D convolution neural network (ConvNet) for feature extraction and
fail to enjoy the benefits from the backbone scaling and pretraining in the
image domain. To show the scaling-up capacity in point clouds, we introduce the
dense ConvNet pretrained on large-scale image datasets (e.g., ImageNet) as the
2D backbone of pillar-based detectors. The ConvNets are adaptively designed
based on the model size according to the specific features of point clouds,
such as sparsity and irregularity. Equipped with the pretrained ConvNets, our
proposed pillar-based detector, termed PillarNeSt, outperforms the existing 3D
object detectors by a large margin on the nuScenes and Argoversev2 datasets.
Our code shall be released upon acceptance
GPT detectors are biased against non-native English writers
The rapid adoption of generative language models has brought about
substantial advancements in digital communication, while simultaneously raising
concerns regarding the potential misuse of AI-generated content. Although
numerous detection methods have been proposed to differentiate between AI and
human-generated content, the fairness and robustness of these detectors remain
underexplored. In this study, we evaluate the performance of several
widely-used GPT detectors using writing samples from native and non-native
English writers. Our findings reveal that these detectors consistently
misclassify non-native English writing samples as AI-generated, whereas native
writing samples are accurately identified. Furthermore, we demonstrate that
simple prompting strategies can not only mitigate this bias but also
effectively bypass GPT detectors, suggesting that GPT detectors may
unintentionally penalize writers with constrained linguistic expressions. Our
results call for a broader conversation about the ethical implications of
deploying ChatGPT content detectors and caution against their use in evaluative
or educational settings, particularly when they may inadvertently penalize or
exclude non-native English speakers from the global discourse
Dense Teacher: Dense Pseudo-Labels for Semi-supervised Object Detection
To date, the most powerful semi-supervised object detectors (SS-OD) are based
on pseudo-boxes, which need a sequence of post-processing with fine-tuned
hyper-parameters. In this work, we propose replacing the sparse pseudo-boxes
with the dense prediction as a united and straightforward form of pseudo-label.
Compared to the pseudo-boxes, our Dense Pseudo-Label (DPL) does not involve any
post-processing method, thus retaining richer information. We also introduce a
region selection technique to highlight the key information while suppressing
the noise carried by dense labels. We name our proposed SS-OD algorithm that
leverages the DPL as Dense Teacher. On COCO and VOC, Dense Teacher shows
superior performance under various settings compared with the pseudo-box-based
methods.Comment: ECCV202
ADriver-I: A General World Model for Autonomous Driving
Typically, autonomous driving adopts a modular design, which divides the full
stack into perception, prediction, planning and control parts. Though
interpretable, such modular design tends to introduce a substantial amount of
redundancy. Recently, multimodal large language models (MLLM) and diffusion
techniques have demonstrated their superior performance on comprehension and
generation ability. In this paper, we first introduce the concept of
interleaved vision-action pair, which unifies the format of visual features and
control signals. Based on the vision-action pairs, we construct a general world
model based on MLLM and diffusion model for autonomous driving, termed
ADriver-I. It takes the vision-action pairs as inputs and autoregressively
predicts the control signal of the current frame. The generated control signals
together with the historical vision-action pairs are further conditioned to
predict the future frames. With the predicted next frame, ADriver-I performs
further control signal prediction. Such a process can be repeated infinite
times, ADriver-I achieves autonomous driving in the world created by itself.
Extensive experiments are conducted on nuScenes and our large-scale private
datasets. ADriver-I shows impressive performance compared to several
constructed baselines. We hope our ADriver-I can provide some new insights for
future autonomous driving and embodied intelligence.Comment: Tech Repor
Molecular cloning, characterization and expression analysis of CpCBF2 gene in harvested papaya fruit under temperature stresses
Background: C-repeat binding factors (CBFs) are transcription factors
that regulate the expression of a number of genes related to abiotic
stresses. Few CBF genes have been cloned from other plants but no
report in papaya. In present study, a full-length cDNA, designated as
CpCBF2, was cloned from papaya using in silico cloning and 5\u2019-
rapid amplification cDNA ends (RACE). Sequence analysis was performed
to understand the gene function. The expression pattern of CpCBF2 in
papaya under low (7\ubaC) and high temperature (35\ubaC) stresses
was examined using real-time quantitative polymerase chain reaction
(RT-qPCR). Results: The full-length cDNA of CpCBF2 was 986-bp, with a
762-bp open reading frame (ORF) encoding a 254 amino acid polypeptide.
CpCBF2 contained several major highly conserved regions including the
CBF-family signature PKRRAGRKKFQETRHP and FADSAW in its amino acid
sequence. Phylogenetic tree and three-dimensional structure analysis
showed that CpCBF2 had a relatively close relationship with other plant
CBFs. Gene expression analysis showed that high temperature stress had
little effect on the expression of CpCBF2 but low temperature repressed
CpCBF2 expression. Conclusion: The results showed that CpCBF2 may
involve in different roles in temperature stress tolerance. This study
provided a candidate gene potentially useful for fruit temperature
stress tolerance, although its function still needs further
confirmation
Circulating tumor DNA clearance predicts prognosis across treatment regimen in a large real-world longitudinally monitored advanced non-small cell lung cancer cohort
Background: Although growth advantage of certain clones would ultimately translate into a clinically visible disease progression, radiological imaging does not reflect clonal evolution at molecular level. Circulating tumor DNA (ctDNA), validated as a tool for mutation detection in lung cancer, could reflect dynamic molecular changes. We evaluated the utility of ctDNA as a predictive and a prognostic marker in disease monitoring of advanced non-small cell lung cancer (NSCLC) patients.Methods: This is a multicenter prospective cohort study. We performed capture-based ultra-deep sequencing on longitudinal plasma samples utilizing a panel consisting of 168 NSCLC-related genes on 949 advanced NSCLC patients with driver mutations to monitor treatment responses and disease progression. The correlations between ctDNA and progression-free survival (PFS)/overall survival (OS) were performed on 248 patients undergoing various treatments with the minimum of 2 ctDNA tests.Results: The results of this study revealed that higher ctDNA abundance (P=0.012) and mutation count (P=8.5x10(-4)) at baseline are associated with shorter OS. We also found that patients with ctDNA clearance, not just driver mutation clearance, at any point during the course of treatment were associated with longer PFS (P=2.2x10(-1)6, HR 0.28) and OS (P=4.5x10(-6), HR 0.19) regardless of type of treatment and evaluation schedule.Conclusions: This prospective real-world study shows that ctDNA clearance during treatment may serve as predictive and prognostic marker across a wide spectrum of treatment regimens
Robust estimation of bacterial cell count from optical density
Optical density (OD) is widely used to estimate the density of cells in liquid culture, but cannot be compared between instruments without a standardized calibration protocol and is challenging to relate to actual cell count. We address this with an interlaboratory study comparing three simple, low-cost, and highly accessible OD calibration protocols across 244 laboratories, applied to eight strains of constitutive GFP-expressing E. coli. Based on our results, we recommend calibrating OD to estimated cell count using serial dilution of silica microspheres, which produces highly precise calibration (95.5% of residuals <1.2-fold), is easily assessed for quality control, also assesses instrument effective linear range, and can be combined with fluorescence calibration to obtain units of Molecules of Equivalent Fluorescein (MEFL) per cell, allowing direct comparison and data fusion with flow cytometry measurements: in our study, fluorescence per cell measurements showed only a 1.07-fold mean difference between plate reader and flow cytometry data