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" ... As an example of the intrinsic limitations of data-centric systems that are not guided by explicit models of reality, consider a risk-estimation model for those hospitalized with pneumonia [4]. From the data, the model learned that asthmatics are less likely to die from pneumonia. Counterintuitive? Indeed. The researchers traced the strange result back to an existing policy underlying the observed data: asthmatics with pneumonia were directly admitted to the intensive care unit (ICU), therefore receiving more aggressive treatment, and thus less likely to die than patients not given the same attention. ... "
" ... Less fun is when rewarding the exact wrong action happens in the real world: in developing a risk-estimation model for those hospitalized with pneumonia, a model trained on real-world data learned that asthmatics are less likely to die from pneumonia [8]. Unbeknownst to the data-centric model there was something underlying the dataset causing erroneous associations: The researchers traced the strange result back to an existing policy, where asthmatics with pneumonia were directly admitted to the intensive care unit (ICU), therefore receiving more aggressive treatment, and thus less likely to die than patients not given the same attention. The model learned that asthmatics should not be recommended to the ICU! ... "
" ... Stanley Park and Lions Gate Bridge are covered in smog from clouds and smoke due to forest fires in ... [+] Washington, Oregon and California, September 17, 2020, in Vancouver, Canada. - Smoke from California and Oregon wildfires has cloaked Vancouver, known for its majestic mountain views and fresh ocean breezes, in the dirtiest air in the world this week. Days have been spent smarting under a thick haze that has irritated eyes and throats, and sent asthmatics gasping for breath. It has also complicated Covid-19 testing. On September 18, 2020, despite forecasted smoke-clearing rain storms, the city, 800 miles (1,300 km) north of the biggest California fires, topped for the second time this week the World Air Quality Index for worst air quality, after briefly ceding first place to fire-stricken Portland, Oregon. (Photo by Don MacKinnon / AFP) (Photo by DON MACKINNON/AFP via Getty Images) ... "