resize method
Resize the embedding to accommodate newSize entries.
Preserves existing embeddings and zero-initializes new rows.
Implementation
void resize(int newSize) {
if (newSize == numEmbeddings) return;
final newWeight = Float32List(newSize * embeddingDim);
final copyCount = newSize < numEmbeddings ? newSize : numEmbeddings;
for (int i = 0; i < copyCount * embeddingDim; i++) {
newWeight[i] = weight.data[i];
}
weight = Tensor(newWeight, [newSize, embeddingDim]);
numEmbeddings = newSize;
}