My goal is to find the best performing forecasting model for the occurrence of COVID-19 in Toronto. I pre-train the network with data on the occurrence of SARS in ten countries and Toronto. Then I train the network with the data on the occurrence of COVID-19 in the same regions and factors which can affect this number (like age, population density, etc.). How accurate would it be to use this model to predict occurrence of COVID-19 and the number of deaths caused by it in Toronto? Thank you for your help.
So the question is about whether you could use the model you have described to create valid predictions of COVID-19 occurrence in Toronto.
I would say this is depend on the data you have used. Check the distribution of features (age, population density, etc.). If there is large variation in the features(such that the Toronto values are observed as outliers against the others), this could lead to large variation and skew in the model's predictions.