Nanophotonic reservoir computing for COVID-19 pandemic forecasting.

3 a–c, the new death cases in the three developed countries of the USA, the UK and Italy show an overall trend of decreasing first and then increasing, whereas in Fig. 3 d–f, the new death cases in the three developing countries of India, Saudi Arabia and Argentina reduce gradually.

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4 a–c has maintained an increasing trend from June to December 2021, while the slope of the cumulative case curves for three developing countries (IN, SA and AR) shown in Fig. 4 d–f has gradually diminished from June to December 2021, and even tending to 0.

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