[FEA] PCA Initialization for TSNE
Closes https://github.com/rapidsai/cuml/issues/3458
Add PCA embedding initialization to C++ layer and expose it in Python API.
from cuml.manifold import TSNE
tsne = TSNE(
...
init="pca" # ("random" or "pca")
)
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/ok to test
@aamijar the git diff will be fixed once #5911 is merged
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/merge