I have two nn.Embeddings, A and B, with different embeddings num.  B contains A. For an example:
A:
index    weight
1        [0.1, 0.2]
2        [0.4, 0.6]

B:
index    weight
1        zeros
2        zeros
3        zeros

Now I want to copy the weights in A to B. After copy B should be like:
B:
index    weight
1        [0.1, 0.2]
2        [0.4, 0.6]
3        zeros

Any workable method? I only know a function from_pretrained can achieve weight loading, but it requires the same structure.
Or… anyway to expand A?  I don’t know if nn.Embedding is static.