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Articles by Devin Chen
Hindsight-anchored policy optimization: Turning failure into feedback in sparse reward settings
Reinforcement Learning with Verifiable Rewards (RLVR) has emerged as a promising paradigm for post-training reasoning models. However, group-based methods such as Group Relative Policy Optimization (GRPO) face a critical dilemma in sparse-reward settings: pure Reinforcement Learning (RL) suffers from advantage collapse and high-variance gradient estimation, while mixed-policy optimization introduces persistent distributional bias.
Near-infrared spectroscopy as a diagnostic screening tool for lethal chytrid fungus in eastern newts - Communications Biology
Abstract The emergence of Batrachochytrium salamandrivorans (Bsal) poses an imminent threat to caudate biodiversity worldwide, particularly through anthropogenic-mediated means such as the pet trade. Bsal is a fungal panzootic that has yet to reach the Americas, Africa, and Australia, presenting a significant biosecurity risk to naïve amphibian populations lacking the innate immune defenses necessary for combating invasive pathogens.
《老鼠上灯台的真的故事。。。》
Devin Chen · Follow Just now -- 有一个老鼠叫小明星。小明星爱冒险，所以他准备去旅游。 几天之后，小明星去旅游了。 ～～～ 过了一会儿，小明星饿了。 突然他想到：灯台里边不是有油吗，如果我上灯台偷油吃，不是就会吃饱吗？ 但是灯台在一个桌子上。他这么上去呢？啊! 他往椅子上爬！跳上椅子的腿，慢慢的爬上去。在椅子上，他在往椅背上爬。爬呀爬呀，爬不动。太滑了。啊！知道了！他如果跳上去在用爪子抓就能上去。小明星上去椅背了。一下就跳过到桌子上了。在桌子上了，他终于可以吃油了！喵喵。。。喵喵。。。喵喵。。。，哎呀！猫来啦，赶快跑啊！去哪里藏起来呢？ 小明星爬上了台灯上。 小明星喊：“啊！” 小明星不小心掉进去了台灯了！ “救命啊，救命啊！”：小明星喊。 猫来啦，啊！闭上眼睛。什么？猫去哪了？啊，猫被主人赶走到别的屋了。 ～～～ 过了一会儿，小明星爬出来了。前面就是一台电脑, 一台比他大五倍的电脑。 小明星问：这么大的东西是啥呀？可能是个电视吧。。。 说一说他就开始乱点，突然看到了一个猫在跳舞！ 小明星叫：啊！ 他闭上眼睛，等了一会儿。一看，只是一个视频！...
Enhancing predictive performance for spectroscopic studies in wildlife science through a multi-model approach: A case study for species classification of live amphibians
Loading metrics Open Access Peer-reviewed Research Article ? This is an uncorrected proof. Citation: Chen L-D, Caprio MA, Chen DM, Kouba AJ, Kouba CK (2024) Enhancing predictive performance for spectroscopic studies in wildlife science through a multi-model approach: A case study for species classification of live amphibians. PLoS Comput Biol 20(2): e1011876. https://doi.org/10.1371/journal.pcbi.1011876 Editor: Jason A.
Investing Across the Spectrum: Part 3
Text on screen: PIMCO Text on screen: PIMCO provides services only to qualified institutions and investors. This is not an offer to any person in any jurisdiction where unlawful or unauthorized. Voice-over: From inflation to interest rates, today’s ongoing disruptions present opportunities for investors. In this series, our portfolio managers explore how PIMCO’s deep expertise across public and private markets gives investors the flexibility to navigate the ever-evolving landscape.
Oral administration of GnRH via a cricket vehicle stimulates spermiation in tiger salamanders (Ambystoma tigrinum)
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Detect audio-video temporal synchronization errors in advertisements
Detecting audio-video (A/V) synchronization error is important to measure end user experience. Today, researchers in this domain are mainly focused on contents such as movies or sports. The state of art algorithms usually first detect a specific type of events and then correlate the A/V data within during these events, e.g., find the human chatting events and then correlate the vocals with the lip shapes. Detecting A/V sync errors during Ads, on the other hand, has not received a lot of attentions.
Opportunities in U.S. Commercial Real Estate Debt Investing
A sizable supply-demand mismatch in commercial real estate debt markets should create attractive opportunities for nontraditional lenders. Tighter regulations have prompted traditional lenders, such as banks and insurance companies, to cut back lending and be less active in the commercial mortgage-backed securities market. Borrowers with the greatest needs have assets outside top markets but have significant size and liquidity.
Opportunities in U.S. Commercial Real Estate Debt Investing
The commercial real estate (CRE) market has undergone a significant recovery since the global financial crisis of 2008-2009. However, not all segments of the market have participated equally in the recovery – including within the CRE debt market. In the following interview, portfolio managers Devin Chen and Jeffrey Thompson discuss the state of the market, including risks and opportunities for investors. Q: What’s the current financing environment for U.S. commercial real estate?
Opportunities in U.S. Commercial Real Estate Debt Investing
The commercial real estate (CRE) market has undergone a significant recovery since the global financial crisis of 2008-2009. However, not all segments of the market have participated equally in the recovery – including within the CRE debt market. In the following interview, portfolio managers Devin Chen and Jeffrey Thompson discuss the state of the market, including risks and opportunities for investors. Q: What’s the current financing environment for U.S. commercial real estate?
Young Bucks T-shirts
All Micro Brawlers are licensed and sold by ProWrestlingTees.com. For exclusive brawlers, subscribe to ProWrestlingCrate.com Each Figure differs in exact size but are approximately 3” tall with the exception of Swoggle. All figures are designed in Chicago and assembled in Hong Kong. Figures come packaged in their own exclusive packaging.
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