What is meaning of 'Projection' in Deep Learning?

Question

When i search for deep learning documents or paper,

sometimes i find 'Projection' on Deep learning.

but i don't know the definition of 'Projection'.

I think that the meaning of projection is change vector space to other vector space.

for example

# python code
X = np.zeros([200,100])
W = np.zeros([100,300])

XW = np.matmul(X,W) # XW shape is [200,300]

At this point, and i think X is projected onto XS. Am I correct?

Answer 1

听起来像您所指的vector projection。我喜欢灯光，所以如果您想像一下在手臂之前直接坐在灯光下，手臂在桌子上……将肘部放在桌子上，然后举起手直到手臂与空中成一个角度，投影矢量将然后成为手臂/手在桌上的阴影！