Africa
Spatial Mapping with Gaussian Processes and Nonstationary Fourier Features
Ton, Jean-Francois, Flaxman, Seth, Sejdinovic, Dino, Bhatt, Samir
The use of covariance kernels is ubiquitous in the field of spatial statistics. Kernels allow data to be mapped into high-dimensional feature spaces and can thus extend simple linear additive methods to nonlinear methods with higher order interactions. However, until recently, there has been a strong reliance on a limited class of stationary kernels such as the Matern or squared exponential, limiting the expressiveness of these modelling approaches. Recent machine learning research has focused on spectral representations to model arbitrary stationary kernels and introduced more general representations that include classes of nonstationary kernels. In this paper, we exploit the connections between Fourier feature representations, Gaussian processes and neural networks to generalise previous approaches and develop a simple and efficient framework to learn arbitrarily complex nonstationary kernel functions directly from the data, while taking care to avoid overfitting using state-of-the-art methods from deep learning. We highlight the very broad array of kernel classes that could be created within this framework. We apply this to a time series dataset and a remote sensing problem involving land surface temperature in Eastern Africa. We show that without increasing the computational or storage complexity, nonstationary kernels can be used to improve generalisation performance and provide more interpretable results.
UC Irvine professors create a video game that explores the culture of 18th-century Ghana
Magda El Zarki recalls repeatedly telling her children to stop playing video games and enjoy the outdoors. She laughs at the memory now. A visit to Ghana in 2010 inspired the UC Irvine computer science professor to try her hand at creating virtual reality spaces and later computer games. She and Patricia Seed, a UC Irvine history professor, and Jessica Kernan, an industry professional and a staff member at the college's Institute for Virtual Environments and Computer Games, developed the computer game "Sankofa." Set in 18th-century Ghana, then known as Asante, the storyline begins when a mother sends her daughter to gather yams from the market.
US-targeted IS in Somalia could be a 'significant threat'
MOGADISHU, Somalia – The Islamic State group's growing presence in Somalia could become a "significant threat" if it attracts fighters fleeing collapsing strongholds in Syria and Iraq, experts say, and already it seems to be influencing local al-Shabab extremists to adopt tactics like beheadings. The U.S. military this month carried out its first drone strikes against IS fighters in Somalia, raising questions about the strength of the group that emerged just two years ago. A second strike targeted the fighters on Sunday, with the U.S. saying "some terrorists" were killed. The Islamic State group burst into public view in Somalia late last year as dozens of armed men seized the port town of Qandala in the northern Puntland region, calling it the seat of the "Islamic Caliphate in Somalia." They beheaded a number of civilians, causing more than 20,000 residents to flee, and held the town for weeks until they were forced out by Somali troops, backed by U.S. military advisers.
US Carries Out 3 Drone Strikes Against Extremists in Somalia
"U.S. forces will continue to use all authorized and appropriate measures to protect Americans and to disable terrorist threats," said the spokeswoman. The U.S. forces are working with Somalia's security forces and the 22,000-strong African Union force of soldiers from neighboring countries and they are "targeting terrorists, their training camps and safe havens throughout Somalia, the region and around the world," she said.
US carries out 3 drone strikes against extremists in Somalia
MOGADISHU, Somalia – U.S. forces say they have carried out three drone strikes within 24 hours in Somalia, stepping up their campaign against the Islamic extremist rebels of al-Shabab and the Islamic State group. The strikes by unmanned drones killed several extremist fighters, a spokeswoman for the U.S. military command in Africa told The Associated Press Sunday. With these three attacks, the U.S. has now carried out 26 attacks in Somalia against extremist targets in 2017, she said. The latest U.S. strikes were carried out in coordination with Somalia's government, she said. The first strike happened Saturday at approximately 4:30 p.m. local Somalia time and it killed one fighter for the extremists group, al-Shabab, said a U.S. Africa command statement.
U.S. drone strike in Somalia against Shabab kills 'several'
The United States military said Saturday it has carried out a new drone strike against the Shabab extremist group in Somalia, killing "several" militants. A statement by the U.S. Africa Command said the strike was carried out Friday night in Lower Shabelle region, about 20 miles north of the capital, Mogadishu. It came a day after another strike in the Bay Region, about 100 miles west of Mogadishu. Friday's airstrike was the 23rd the U.S. military has carried out this year against the Al Qaeda-linked Shabab and the far smaller Islamic State group in Somalia. The Trump administration earlier this year approved expanded military operations against extremists in the Horn of Africa nation. The latest U.S. drone strike was carried out in coordination with Somalia's government, the U.S. statement said.
US drone strike in Somalia against al-Shabab kills 'several'
MOGADISHU, Somalia – The United States military said Saturday it has carried out a new drone strike against the al-Shabab extremist group in Somalia, killing "several" militants. A statement by the U.S. Africa Command said the strike was carried out Friday night in Lower Shabelle region, about 20 miles (32 kilometers) north of the capital, Mogadishu. It came a day after another strike in the Bay Region, about 100 miles west of Mogadishu. Friday's airstrike was the 23rd the U.S. military has carried out this year against the al-Qaida-linked al-Shabab and the far smaller Islamic State group in Somalia. The Trump administration earlier this year approved expanded military operations against extremists in the Horn of Africa nation. The latest U.S. drone strike was carried out in coordination with Somalia's government, the U.S. statement said.
How Assassin's Creed: Origins' photo mode makes your Egyptian tourism feel important
For years I've claimed Assassin's Creed is better as virtual tourism than it is as a game proper. It was only a matter of time until they gave players a camera. Uplay tells me I'm at 83 percent completion overall--just some forts and a few side quests to mop up, but I've finished Bayek's story, learned how the Assassins came into existence, uncovered the secrets of the Pyramids and the Great Sphinx. And Bayek's right, the Sphinx is smaller than I thought. And yet my map is still full of icons.