Density Map generation

[wuzhe71]

In density map generation, the gaussian_filter_density function will lead to slight variation. So i change the code:

density += scipy.ndimage.filters.gaussian_filter(pt2d, sigma, mode='constant')

to

map = scipy.ndimage.filters.gaussian_filter(pt2d, sigma, mode='constant')
map = map / map.sum()
density += map

This could avoid the slight variation, but would it affect the training?

[WYG-2021]

the map.sum() is 1,I think it didn't work, did it?